DE10040416A1 - Waste water treatment plant removes phosphor compounds by coagulation - Google Patents

Abstract

A waste water treatment assembly incorporates a coagulation unit which removes phosphorous components as a poorly soluble metal salt. The water treatment assembly combines conventional treatment stages with the coagulated removal of phosphor compounds. The assembly consists of a tank (1) having a first compartment (5) with an anaerobic filter, a second compartment (10) with anaerobic filter, and a contact aeration compartment (14). The unit further has a compartment (19) for treated water, a disinfecting section (21), an electrolysis bath (37) with electrodes (41, 42) and a manhole cover (28). The electrodes (41, 42) break down progressively surrendering metal ions to the first compartment (5). The electrodes (41, 42) are fixed to the manhole cover (28).

Description

The present invention relates to a wastewater treatment and a coagulation device in are able to contain a Phosphorkompo contained in the wastewater deposit as a sparingly soluble metal salt in water.

There are conventional waste water treatment devices with elec trodes that are electrolytically decomposed and by the Me tallionen resulting from the electrolysis, a water component contained in the phosphorus component as a metal salt from differing, which is sparingly soluble in water. In such a waste water treatment apparatus, the electrodes are fixed in an electrolytic bath. Fig. 38 shows a typical Elek trolysebad 800 a conventional Abwasserbehandlungsvor direction.

Referring to Fig. 38, the electrolytic bath 800 has the electrodes 801 and 802 fixed therein and an inlet 803 for introducing treated water. The electrodes 801 and 802 are each connected to a power source and are energized so that either the electrode 801 or the electrode 802 is electrolytically decomposed. The metal ions resulting from this electrolysis react with a phosphorus component contained in the treated water introduced through the inlet 803 to form a metal salt which is sparingly soluble in water. The electrolysis bath 800 is provided at its lower part with a valve 805 . The valve 805 is brought to bring out the above-mentioned metal salt from the electrolyte sebad 800 suitably controlled.

However, in the usual waste water treatment apparatus, the metal salt is not sufficiently discharged from the electrolytic bath 800 , adversely affecting the electrolysis.

In the conventional waste water treatment apparatus, the electrolysis bath 800 may further be provided in a further tank which receives fecal waste water. The metal salt released from the electrolysis bath 800 is deposited with sludge deposited in this tank. When the metal salt is deposited with the slurry, it becomes difficult to recover phosphorus from the metal salt. The disadvantage is that this hinders an increasingly necessary recovery of phosphorus.

There are normal coagulation devices that come from one Coagulation tank and a tank for chemical precipitation be stand to a Phos. contained in the treated water phorus component or the like as sparingly soluble in water coagulate and precipitate metal salt.

Fig. 39 is a block diagram showing the treatment flow in a waste water treatment apparatus including the normal coagulation apparatus.

Referring to Fig. 39, waste water is continuously circulated through a flow control sub tank 901 , a coagulation tank 902 , a chemical precipitation tank 903, and a disinfection tank 904 . The water treated by these tanks 901 to 904 is discharged from the disinfection tank 904 .

A chemical for supplying iron ions or aluminum ions into the waste water is introduced into the coagulation tank 902 as a coagulant for coagulating a prescribed component of the waste water. A Phosphorkompo component can be coagulated and removed from the wastewater, whereby a BSB value (biochemical oxygen demand), an SS value (solid suspended matter) and a COD value (chemical oxygen demand) of the waste water can be reduced, in which such a chemical is initiated. The BOD value expresses the amount of microorganism degradable organic substance in terms of oxygen content. The FS value expresses the amount of particles, etc., that are not dissolved but float in the water. The COD value, an indication representing the degree of contamination of the water in a marine area or the like, expresses the amount of organic substance which is oxidizable with an oxidizing agent.

The ge with the coagulant in the coagulation tank 902, mixed waste water is introduced together with formed in the Verklumpungstank 902 flakes in the tank for chemical precipitation 903rd The flakes introduced from the coagulation tank 902 are sedimented in the chemical precipitation tank 903 , while the mud water from the chemical precipitation tank 903 is introduced into the disinfection tank 904 , suitably disinfected, and then emptied.

In the apparatus for chemical precipitation shown in Fig. 39, however, the coagulation process is dangerous since the chemical introduced as a coagulant is an acidic solution, while for coagulation, the pH in the coagulation tank 902 must be adjusted. Thus, it is difficult to reliably remove the phosphorus component.

In general, one in a Abwasserbehandlungvorrich or manufactured in a coagulation device Coagulum of a phosphorus compound granular. Also from this Point of view, it is difficult to get the coagulated phosphorus Reliably remove connection.  

Consequently, taking into account the above order Stands the present invention has been proposed where when it is a task, a Abwasserbehandlungvorvor direction and to provide a coagulation device, the one phosphorus compound to be treated water can remove reliably.

Another object of the present invention is a larger amount of a phosphorus compound in recyclable Regain state.

Yet another object of the present invention is it, a sewage treatment device and a coagulati Onsvorrichtung to be provided, which are able in the Wastewater containing component, such as phosphorus, safe to coagulate.

A wastewater treatment device for the treatment of Wastewater according to an embodiment of the present invention tion includes a wastewater-storing wastewater treatment Part containing an adsorption element, which is a mage having a table component.

According to the present invention, the adsorption element ment a Anhäu formed in the wastewater treatment part magnetically absorb a phosphorus compound.

Therefore, the phosphorus compound can be reliably removed from the Ab be removed.

In the waste water treatment apparatus according to the present invention Invention preferably contains the wastewater treatment part a tank for activated sludge, in which active sludge ge is stored, and a filter to filter off ridden water in activated sludge tank, the adsorpti onselement preferably arranged in the vicinity of the filter is.  

Thus, the coagulum of the phosphorus compound by the Ad absorption element, wherein a blockage of the Filters can be prevented.

In the waste water treatment apparatus according to the present invention Invention, the adsorption element is preferably einstöc kig provided with the filter.

Thus, the adsorbent the coagulum of Phos Phorverbindung adsorbie around the filter reliable Accordingly, it can be more reliably prevented that the coagulum of the phosphorus compound ver ver stuffs.

The waste water treatment apparatus according to the present invention Invention further preferably comprises an ion supply part, the iron ions or aluminum ions in the sewage treatment feeding part, wherein the wastewater treatment part ago preferably contains a sedimentation tank to abge a coagulum divide, resulting from the reaction between the ions Zuführteil supplied iron ions or aluminum ions and the treated water, the Adsorptionsele ment is preferably clamped in settling tank.

Thus, the adsorbent element can be the phosphorus compound absorb more effectively. The ent in the treated water Keeping phosphorus compound reacts with the iron ions or Aluminum ions so that they pass through the adsorption element are receivable.

In the waste water treatment apparatus according to the present invention In the invention, the ion supply member preferably comprises an in the treated water immersed electrode, an elec electrode holding the electrode without it in the treated water is dipped, as well as a verb in order to connect the electrode to a power source  bind, wherein the connecting part preferably on the electrodes holding part is provided.

This can prevent the electrically connected Parts of the electrode and the power source in the recycled Water is soaked in and corroded.

In the waste water treatment apparatus according to the present invention Invention, the electrode holding member is preferably with egg nem notching provided with at least one Part of the electrode can engage.

This stabilizes the fixed position of the electrode.

Therefore, a distribution of the supplied by the electrode led ions stabilized in the ion supply part, thereby the treatability of wastewater of wastewater treatment stabilizing device is stabilized.

One wastewater treatment device after another embodiment of the present invention comprises an electro lytic unit, which is an electrode for electrolyti decomposition of the electrode in the electrolytic Ein unit, whereby a contained in the treated water tene phosphorus component is deposited as a metal salt, which is sparingly soluble in water, and the electrolytic Unit further comprises a housing which only the Seitenflä covered by the electrode.

According to the present invention, the electrode is connected to the Housing covered so that metal ions resulting from the Electrolysis of the electrode result, effective with the aufbe rode water can react. The housing is without Bo that, and therefore, that may be due to the reaction between the Me and the phosphorus contained in the treated water phorus component resulting metal salt quickly becomes egg move away from the electrode.  

Therefore, it can be prevented that in the Abwasserbe Acting device deposited metal salt the effective the electrolysis of the electrode and the reaction zwi the metal ions and the treated water kept phosphorus component reduced. In other words, the waste water treatment device can the Phosphorkompo remove the component reliably.

In the waste water treatment apparatus according to the present invention Invention may preferably the electrolytic unit further a Umrührbauteil for stirring one with the housing enclosed space included.

So that can result from the electrolysis of the electrode metal ions with the treated water more effectively react.

The waste water treatment apparatus according to the present invention The invention preferably further comprises an anaerobic tank with anaerobic microorganisms therein, a aerobic tank with aerobic microorganisms inside and a settling tank for separating sewage, wherein the electrolytic unit preferably in the anaerobic tank, clamped in the aerobic tank or sedimentation tank. Thus, the wastewater treatment device can be made more compact be led.

A wastewater treatment device after yet another Embodiment of the present invention comprises a electrolytic unit with an electrode for electroly tables decomposition of the electrode in the electrolytic Unit, whereby one contained in the treated water Phosphorus component as a metal salt that is light in water is soluble, is deposited, and further has a downstream of the electrolytic unit in addition to this  to the metal salt se to recover selectively.

According to the present invention, the recovery may be This is abgeschie in the wastewater treatment device regain the metal salt. That's why it can be prevented be that the metal salt with mud in the sewage serbehandlungsvorrichtung mixed.

Therefore, it can be prevented that the separated Me tallsalt inhibits a reaction around the electrode, wherein the effectiveness of recovery of the above Me tallsalzes in a regenerable state improved who that can. In other words, the sewage treatment before Direction can reliably remove the phosphorus compound and improve the recyclability of phosphorus.

In the waste water treatment apparatus according to the present the invention preferably contains the recovery unit example, an adsorption device for receiving the metal salt.

So the metal salt can be more reliable in a regenerierba be recovered state.

The waste water treatment apparatus according to the present invention Invention preferably further comprises an inflow tank, the Fäkalabwasser receives, the electrolytic A unit and the recovery unit preferably in the one Strömtank are clamped.

So it follows that the electrolytic unit and the Recovery unit are arranged in a tank in which the sparingly soluble in water metal salt, which is found in the Wastewater treatment device has deposited with Mud mixes.  

Therefore, the phosphorus component can be effectively incorporated into the electro lytic unit are fed while the Rückgewin unit can show its effect sufficiently.

The waste water treatment apparatus according to the present invention The invention further preferably comprises an anaerobic tank with anaerobic microorganisms present therein, one aerobic tank with aerobic microorganisms inside and a wastewater separating settling tank, wherein the electrolytic unit and the recovery unit preferably outside the anaerobic tank, the aerobic tank and the settling tank are arranged to sew up take this through the anaerobic tank, the aerobic tank and the settling tank was treated.

This can prevent that in the Abwasserbe deposited device, easily soluble in water The metal salt is mixed with the sludge to the utmost.

A coagulation device according to another embodiment Form of the present invention comprises a first Tank in which denitrified waste water with metal ions to Coagulation of a precipitate reacts, resulting in the reaction results, and a second tank, the wastewater from the first tank to one in the first tank deposited accumulation, and further an electrolyte sebad, upstream of the first tank ange is closed, and an electrode contains by elek trolytic disassembly of the electrode the first metal tank to supply ions.

According to the present invention, the metal ions become supplied to the first tank by electrolysis of the electrode, without a dangerous coagulant Che to initiate. Thus, in coagulation is no Adjustment of pH required.  

Therefore, the coagulation device in the Abwas contained phosphorus component safely and reliably coagulate.

In the coagulation device according to the present invention The electrolysis bath is preferably designed in such a way that that the wastewater has a residence time of at least three minutes has.

Thus, the electrolysis bath can be made more compact.

A coagulation device according to another embodiment Form of the present invention comprises a first Tank in which denitrified waste water reacts with metal ions g., to coagulate a precipitate product resulting from the reaction results, and a second tank, the wastewater from the first tank to a ge in the first tank deposited coagulum, and the first tank one Electrode contains to the first tank through electrolyti nice disassembly of the electrode to supply metal ions.

According to the present invention, the metal ions are the first tank fed by electrolysis of the electrode, without a dangerous coagulant used as a common To initiate chemical. Thus, in coagulation no pH adjustment required.

Therefore, the coagulation device in the Abwas contained phosphorus component safely and reliably coagulate.

In the coagulation device according to the present invention The electrode is preferably pre-wired by one Benen power source supplied electricity to electrolytically zer to be placed, with the coagulation preferred Continue to wire a wire that has the electrode connected power source, and an electrode holding  part, which holds the electrode, wherein the electro denhalteteil preferably at least a portion of the wire receives.

Thus, the wire can be arranged compact, barely in to immerse the water.

The preceding and other objects, features, Ausfüh forms and advantages of the present invention from the following detailed description of the present the invention more clearly, if in conjunction with the accompanying drawings is made.

Show it

Fig. 1 is a waste water treatment system with a Abwasserbe treatment apparatus according to a first embodiment of the present invention;

Fig. 2 shows the structure of an electrolytic bath and a part around it, which is shown in Fig. 1;

Fig. 3 shows the structure of electrodes and electrode holding parts shown in Fig. 1;

Fig. 4, the electrodes shown in Figure 3 and electrical demhalteteile which are combined with each other to be attached to the electrolytic bath.

Fig. 5 is a perspective view of one of the electrode holding members shown in Fig. 3;

Fig. 6 is a perspective view of the set in Fig. 1 Darge electrolysis bath;

Fig. 7 shows an electrode holding part with notching portions that can hold two electrodes;

Fig. 8 shows the electrodes and the electrode holding member mounted with each other in a unit housed in a housing;

Fig. 9 is a waste water treatment apparatus according to a two-th embodiment of the present invention;

Fig. 10 is a waste water treatment apparatus according to a third embodiment of the present inven tion;

Fig. 11 is a side view of a diaphragm and a Magne th, which are shown in Fig. 10;

Fig. 12 is a partial perspective view of the magnet shown in Fig. 10;

Fig. 13, a waste water treatment apparatus according to a fourth embodiment of the present inven tion;

Fig. 14 is a waste water treatment apparatus according to a fifth embodiment of the present inven tion;

Fig. 15 is a waste water treatment apparatus according to a sixth embodiment of the present invention;

Fig. 16 is a waste water treatment apparatus according to an embodiment of the present invention;

Fig. 17 is a diagram illustrating the manner of mounting the electrodes on manholes shown in Fig. 16;

Fig. 18 is a view in longitudinal section of a Abwasserbehandlungs treatment system with a Abwasserbehandlungsvorrich device according to an eighth embodiment of the present invention;

FIG. 19 is a cross-sectional view of a tank shown in FIG. 18; FIG.

FIG. 20 is a perspective view of an electrolytic unit of the sewage treatment system shown in FIG. 18; FIG.

Fig. 21 is a disassembled perspective view of the electrolytic unit of the sewage treatment system shown in Fig. 18;

Fig. 22 is a longitudinal sectional view of a waste water treatment system and a waste water treatment apparatus according to a ninth embodiment of the present invention;

FIG. 23 is a sectional view of a phosphor recovery unit of the sewage treatment system shown in FIG. 22; FIG.

FIG. 24A and 24B flowcharts lationsvorrichtungen the treatment processes in the combined purification tank including Koagu approximately example according to a tenth exporting and represent an eleventh embodiment of the present invention;

Fig. 25 is a flow chart showing the modification of a treatment in a part surrounded by broken lines R in Fig. 24A or 24B;

Fig. 26 shows the appearance of a part of the combined cleaning supply tank including the coagulation apparatus according to the tenth embodiment of the present invention;

Fig. 27 is a perspective view in disassembled parts of a shown in Figure 26 Elek trolysebades.

FIG. 28 is a perspective view of a pair of electrodes shown in FIG. 27; FIG.

Fig. 29 is an exploded perspective view illustrating the pair of electrodes of Fig. 27 in a partially fragmentary state;

Figures 30 and 31 are fragmentary, perspective views in exploded parts of the pair of electrodes shown in Figure 28;

Fig. 32 is a front view of a sedimentation measuring instrument used to determine the residence time of waste water in the electrolytic bath according to the tenth embodiment of the present invention;

Figs. 33 to 36 show phosphorus elimination ratios in artificial liquids at respective depths of the sedimentation measuring instrument shown in Fig. 32;

Fig. 37 is a disassembled perspective view of an electrolytic unit incorporated in a piled-up tank in the eleventh embodiment of the present invention;

Fig. 38 is typically an electrolytic bath of a normal waste water treatment apparatus;

Fig. 39 is a block diagram showing the Behandlungsablau fes in a wastewater treatment device finally one of a conventional Koagulationsvor direction.

It will now be with reference to the drawings execution Examples of the present invention described. An Ab water treatment device according to each below written embodiment, mainly in one Large wastewater treatment equipment is used to fecal matter sewage or industrial wastewater is also on a water treatment equipment of small or medium Great as a combined household cleaning tank reversible. The wastewater treatment device after each off Guidance example, a phosphorus compound, the Fä Kalabwasser or in the wastewater in particular of a Galva nisierfabrik is included, coagulate.

First embodiment

Referring to Fig. 1, a tank 1 is buried underground. The tank 1 is through a first partition 2 , a second partition 3 and a third partition 4 in a first tank 5 with anaerobic filter bed, a second tank 10 with anaerobic filter bed, a contact aeration tank 14 , a tank 19 for treated water and a disinfection tank 21 , which will be described later. The upper part of the tank 1 is covered with numerous manholes 28 .

Fecal effluent flows through an inlet 6 into the first tank 5 with anaerobic filter bed. In the first tank 5 with an aerobic filter bed a first, anaerobic filter bed 7 is arranged. In the first tank 5 with anaerobic filter bed various, hardly decomposable substances that are mixed in the received Fäkalabwasser abge separated or separated, while adhering to the first anaerobic filter bed 7 anaerobic microorganisms in the Fä kalabwasser containing organic compounds anaerobically degrade. The first tank 5 with anaerobic filter bed anaerobically decomposes the organic nitrogen contained in the fecal wastewater into ammonia nitrogen.

A first advection tube 8 leads in the first tank 5 with anaerobically degraded aerobic filter bed wastewater through a first water feed opening 9 to the second tank 10 with anaero bem filter bed. The first water supply port 9 passes through an upper portion of the first partition wall 2 through.

The above-mentioned first partition wall 2 separates the second anaerobic filter bed tank 10 from the first tank 5 with an aerobic filter bed. In the second tank 10 with anaerobic filter bed a second anaerobic filter bed 11 is angeord net. The second anaerobic filter bed 11 receives suspended substances. Anaerobic microorganisms present in the second tank 11 with anaerobic filter bed decompose organic material anaerobically to generate organic nitrogen accordingly. The organic nitrogen is anaerobically degraded to ammonia nitrogen.

A second advection tube 12 leads the anaerobically degraded in the second tank 10 with anaerobic filter bed wastewater through a second Wasserzuführöffnung 13 to the contact aeration tank 14 . The second water supply port 13 passes through an upper portion of the second partition wall 3 .

An injector 32 with an inlet opening 31 arranged in the second advection pipe 12 is connected to a third blower 30 . The injector 32 is supplied by the third blower 30 with air, wherein the air from the A blow opening 31 is blown into the second advection tube 12 . Thus, a supply of the waste water from the second tank 10 with anaerobic filter bed in the contact aeration tank 14 in the second advection tube 12 is excited.

The treated water which has been anaerobically treated in the second tank 10 with anaerobic filter bed flows through the second advection tube 12 in the contact aeration tank 14th A provided in the contact aeration tank 14 contact element 15 stimulates a cultivation of aerobic microorganisms men. A first air diffusion tube 16 disposed near the lower part of the contact ventilation tank 14 has a number of air holes. The first Luftdif fusion tube 16 is connected to a first blower 17 to deliver the air supplied from this blower through the air openings and to keep the contact aeration tank 14 in an aerobic state. Thus, the aerobic microorganisms aerobically remove the treated water, while nitrification bacteria decompose the ammonia nitrogen in the contact tank 14 into nitrate nitrogen. In general, the term "nitrification bacteria" indicates ammonia oxidizing bacteria and nitrite bacteria.

Biomembranes, which increase in size by increasing the volume, adhere to the contact element 15 . When air is supplied from the first blower 17 , the first air diffusion pump 16 discharges the air through the air holes to separate the biomembranes from the contact member 15 .

The third partition wall 4 separates the treated water tank 19 from the contact aeration tank 14 . A third Advek tion tube 29 is connected to a first pump 18 , which in turn is operated to supply the sludge water in the contact ventilation tank 14 aerobically degraded, treated What sers through a connection opening 20 to the tank 19 for prepared water. The connection opening 20 passes through an upper portion of the third partition wall 4 .

The muddy water supplied to the treated water tank 19 flows into the disinfecting tank 21 . In the disinfection tank 21 , a degerminator 22 is vorgese hen. The sterilizing apparatus 22 receives a chlorine chemical or the like for disinfecting treated water flowing into the treated water tank 19 . The disinfected, treated water is emptied through an outlet 23 from the tank 1 .

A first return pipe 24 communicates with the treated water tank 19 and an electrolytic bath 37 . An arranged in the first return pipe 24 second Luftdif fusion tube 25 is seen with a number of air openings ver and connected to a second blower 26 . The second air diffusion tube 25 is the blower 26 from the second Ge supplied through the air openings. Thus, the first return pipe 24 sucks a prescribed amount of the muddy water from the treated water tank 19 and transfers it into the electrolytic bath 37 .

In the electrolytic bath 37 electrodes 41 and 42 are arranged, while a third air diffusion tube 40 under the Elek electrodes 41 and 42 is arranged. The third air diffusion tube 40 is formed with a number of air holes and connected to a fourth blower 39 . The third air diffusion tube 40 blows the air supplied from the fourth blower 39 through the air holes to remove membranes such as the biological membranes and membranes in a passive state resulting from nitrate ions or the like from the surfaces of the electrodes 41 and 42 . The electrodes 41 and 42 are preferably provided near the wall surface of the electrolytic bath 37 , so that the membranes can be more effectively removed by the air blown from the third air diffusion tube 40 .

The treated water is discharged from the electrolysis bath 37 through an outlet 47 into the first tank 5 with an anaerobic filter bed. The outlet 47 of the electrolysis bath 37 is provided with a lid 36 . The lid 36 is provided with egg ner float ball 35 . In the vicinity of the lid 36 , a water level sensor 48 is provided to detect the water level in he most tank 5 with anaerobic filter bed. The elec trodes 41 and 42 , the level sensor 48 and the fourth blower 39 are connected to a power supply unit 38 .

The electrodes 41 and 42 are made of, for example, iron or aluminum. With the power supply unit 38 , voltages are applied to the electrodes 41 and 42 so that one of the electrodes 41 and 42 is positive and the other is negative. When the electrodes 41 and 42 are made of iron, the positive electrode and the negative electrode react electrolytically as follows:

Positive electrode: Fe → Fe ²⁺ + 2e ^- (1)

Negative electrode: 2H ⁺ + 2e ^- → H ₂ ↑ (2)

Divalent iron ions (Fe ²⁺ ) generated in the positive electrode are oxidized with air to form trivalent iron ions (Fe ³⁺ ). When the electrodes 41 and 42 are made of aluminum, the reaction of the negative electrode remains unchanged, while the positive electrode reacts electrolytically as follows:

Positive electrode: Al → Al ³⁺ + 3e ^- (3)

While the embodiment has been described with reference to the electrodes 41 and 42 made of iron, aluminum may replace the iron in all respects unless otherwise specified.

The trivalent iron ions (Fe ³⁺ ) formed by the electrolytic reaction according to the formula (1) and the oxidation are used to aggregate a phosphorus compound contained in the purified water supplied from the first return pipe 24 . The main reaction of the lumping of the phosphorus compound with Fe ³⁺ is as follows:

PO ₄ ^3- + Fe ³⁺ → FePO ₄ ↓ (4)

The Elektolysebad 37 is provided at its lower portion with a valve 43 for removing lumps and sludge from the electrolysis bath 37th When the valve 43 is open, the sludge and lumps from the electrolytic bath 37 move into the first anaerobic filter bed tank 5 .

Fig. 2 illustrates the structure of the electrolytic bath 37 and the area around it. Referring to FIG. 2, the prepared water supplied from the first return pipe 24 flows into an inlet 46 of the electrolytic bath 37 . The third air diffusion tube 40 is provided near the electrodes 41 and 42 . The third air diffusion tube 40 guides air to an area around the electrodes 41 and 42 .

The outlet 47 covering the lid 36 is connected to the swim ball 35 . The lower end of the lid 36 is connected to a hinge 34 at the outlet 47 , whereby the outlet 47 is covered so that it is NEN / closable for Publ. When the lid 36 is open, no solution flows through the outlet 47 in the electrolysis bath 37 , when the solution in the first tank 5 with anaerobic filter bed at a level 100 A, while the solution from the first tank 5 with anaerobic filter bed through the outlet 47 flows into the electrolytic bath 37 when it is at a level 100 B.

When the solution is in the first tank 5 with anaerobic filter bed at the level 100 A, the float ball 35 is in a position shown in Fig. 2 35 A, and therefore the lid 36 in a position 36 A to the outlet 47 to to open. When the solution is in the first tank 5 with anaerobic filter bed at the level 100 B, the float ball 35 in Fig. 2 in a position 35 B to close the outlet 47 . According to this embodiment, the off laß 47 is therefore covered with the cover 36 , which in turn is connected to the float ball 35 , so that can be reliably prevented that scum, which is mixed with the flowing through the inlet 6 Fäkalabwasser, directly into the electrolytic 37th can flow. The level mentioned above 100 A may include such a height that the solution flows from the first tank 5 with anaerobic filter bed in the electrolysis bath 37 , while in the solution ent hold scum or the like not in the Elek trolysebad 37 flow.

The electrolysis bath 37 is provided with a control part (not shown), which the opening / closing of the valve 34 , the value of a current flowing through the electrodes 41 and 42 , the voltage values of the electrodes 41 and 42 , the amount of air, from the third air diffusion tube 40 is blown, the polarity of the voltages applied to the 41 and 42 and the like steu ert.

The level sensor 48 is provided to detect that the solution in the first anaerobic filter bed 5 reaches a prescribed height. The level sensor 48 inputs the detected height to the above control part. At pre written height flowing through the inlet 6 Fäkalabwasser flows, for example, directly into the electrolysis 37th

When the level sensor 48 detects that the solution reaches the prescribed level, the controller may issue a warning by a sound or a display. The amount of the flowing through the inlet 6 Fäkalabwassers can be adjusted due to the above construction of the control part that no waste water directly into the Elek trolysebad 37 flows, which reliably prevents who can that the scum flows into the electrolytic 37 . The above prescribed height may be set so that the solution from the first anaerobic filter bed first tank 5 flows into the electrolytic bath 37 , while no scum or the like contained in the solution flows into the electrolytic bath 37 .

A wastewater treatment system according to this embodiment, for example, waiting person can determine whether the flowing through the inlet 6 Fäkalabwasser has flowed directly into the electrolysis bath 37 or not by checking whether the above warning has been issued or not. If the lid 35 and the float ball 36 are not vorgese hen, therefore, the person can festel len by the warning festel whether or not scum accumulates around the electrodes 41 and 42 or not to determine easily whether the electrolysis bath 37 must be cleaned or not.

The controller may control the third air diffusion tube 40 to increase the amount of air supplied therefrom when the level sensor 48 detects that the solution reaches the pre-written height. In addition, the scum, when flowing in the area around the electrodes 41 and 42 , can be removed from the electrolytic bath 37 by increasing the amount of air supplied from the third diffusion tube 40 due to the above-mentioned control. Thus, scum can be more reliably prevented from accumulating around the electrodes 41 and 42 .

From the above embodiment it follows that ver can be prevented that floating mud around the elec trodes 41 and 42 around accumulates when it at least entwe the arrangement of float ball 35 and cover 36 or the level sensor 48 has.

The electrodes 41 and 42 are each attached to the Elektrodenhal parts 41 A and 42 A attached. The electrode holding portions 41 A and 42 A are located at the upper portions of the electrodes 41 and 42 and are held by the later described NEN support rods 37 A and 37 B so as not to be immersed in the stored in the electrolytic 37 , treated water. Fig. 3 shows the structure of the electric Figures 41 and 42 and the electrode holding parts 41 A and 42 A. Fig. 4, the electrodes 41 and 42 and the electric denhalteteile 41 represents A and 42 A, which are combined with each other in the electrolytic bath 37 to be attached.

Referring to Figs. 3 and 4, the upper portions of the electrodes 41 and 42 respectively to the electrode holding parts 41 A and 42 A are screwed. On a surface of the electrode holding part 42 A opposite electrode holding part 41 A, a spacer 405 is attached. The elec trode holding parts 41 A and 42 A are combined and BEFE Stigt that they are opposed by the spacer 405 of FIG. 4 each other. The distance between the electrodes 41 and 42 is adjusted by appropriately adjusting the width of the spacer 405 .

Now, the structure of the electrode holding parts 41 A and 42 A will be described. FIG. 5 is a perspective view of the electrode holding part 41 A. The electrode holding part 41 A includes a wire to connect the electrode 41 to the power supply unit 38 . The fittings 410 and 411 form both ends of the wire. The electrode 41 is screwed to the electrode holding part 41 A, so that it is electrically connected to the connector 410 . At the circuit piece 411 is electrically connected to the power supply unit 38 . Thus, the screwed onto the electrode holding portion 41 A electrode 41 is electrically connected to the power supply unit 38th The electrode holding part 42 A also has two connectors and similar to the electrode holding part 41 A contains a wire. The elec troically connected to the Elek trodenhalteteil 42 A electrode 42 is connected to the power supply unit 38 .

In the waste water treatment system according to this Ausführungsbei game can be prevented that due to the above ge called construction of the electrodes 41 and 42 and the electrical demhalteteile 41 A and 42 A, the wires that connect the electrodes 41 and 42 to the power supply unit 38 in the processed Lying water. Further, it can be prevented that the connecting pieces are immersed in the treated water and corroded.

FIG. 6 is a perspective view of the electrolyzer of FIG. 37. FIG . The two support rods 37 A and 37 B are clamped at a prescribed distance at the upper portion of the electrolysis bath 37th The left lower end and the right lower end of the electrode holding parts 41 A and 42 A are arranged on the support rods 37 A and 37 B, that the electrical demhalteteile 41 A and 42 A are clamped to the electrolytic 37 . From this state, it follows that the electrodes 41 and 42 are held by the support rods 37 A and 37 B, respectively.

The electrolytic bath 37 may be provided with a single electrode holding part having notching portions to hold the electrodes 41 and 42 without misalignment. Fig. 7 shows an electrode holding part 450 with Ausklinkungsabschnitten 451 , which can hold the electrodes 41 and 42 th.

The electrode holding part 450 is provided at its front and rear surfaces with the notching portions 451 , which can respectively engage with the upper portions of the electrodes 41 and 42 . The upper portions of the electrodes 41 and 42 are respectively engaged with the recess portions 451 and are screwed thereto. Thus, the positions of the electrodes 41 and 42 are more reliably fixed in the electrolytic bath, whereby the distribution of iron ions in the electrolysis bath 37 Stabili Siert. It follows that in the electrolysis bath 37, the reaction of formula (4) takes place stably. Thus, the treatment possibility of waste water of the waste water treatment apparatus according to this embodiment is stabilized. When the electrode holding member is secured to the electrolytic bath 37 450, the lower surfaces of the right end view of the left end 450 A and 450 B having the holding rods 37 A and 37 B in contact. Thus, the electrodes 41 and 42 respectively held by the support rods 37 A and 37 B when they are used in EleK trolysebad 37 .

When the electrode holding part 450 and the electrodes 41 and 42 are assembled in a unit for transportation, they are preferably accommodated in a housing 460 as shown in FIG. 8. More specifically, the ten to a unit assembled jew electrode holding portion 450 and electrodes 41 and 42 in housing Ge are added to 460 so that the electrodes are located within the housing 41 and 460 42nd When recording in the Ge housing 460, the right end and the left end 450 A 450 B of the electrode holding part 450 are respectively fixed with screws 461 and 462 on the housing 460th

Second embodiment

It will now be a second embodiment of the present described invention. Each of the wastewater treatment Devices according to the second to sixth Ausführungsbei play mainly aims to make wastewater  Remove phosphorus compound, and where they are as a single ner construction used or with a treatment tank such Tank with anaerobic filter bed can be combined in the anaerobic microorganisms are absorbed.

Referring to Fig. 9, an activated sludge tank 61 storing waste sludge active from another device is formed through an inlet 69 to receive sewage sludge. In the lower part of the activated sludge tank 61 , a first air diffusion tube 62 is arranged. The first air diffusion pipe 62 is connected to a first blower 65 for discharging the air supplied from the first blower 65 through air holes. Thus, the activated sludge tank 61 is kept in an aerobic state to aerobically decompose waste water by aerobic microorganisms, while ammonia nitrogen is decomposed by nitration into nitrate nitrogen.

One end of the circulation pump 63 is inserted in the activated sludge tank 61 . The pump 64 leads the electrolysis bath 70 through the circulation pipe 63 wastewater from the activated sludge tank 61 to. The sludge water of the waste water stored in the activated sludge tank 61 is fed through an advection tube 77 a settling tank 67 .

The electrolytic bath 70 includes electrodes 71 and 72 , which may be made of iron or aluminum. The electric 71 and 72 , which are connected by wires 73 A with a Stromversor supply unit 73 are electrolytically zer sets to supply the electrolysis bath 70 iron ions or aluminum ions. In the electrolytic bath 70 supplied with such metal ions, a phosphorus compound coagulates, for example, according to the above formula (4). A second air diffusion tube 74 is disposed below the electrodes 71 and 72 in the electrolytic bath 70 . The second air diffusion tube 74 is connected to a second blower 66 to purge the air supplied from the second blower 66 into an area around the electrodes 71 and 72 from air holes. Below the second air diffusion pipe 74 , a valve 75 is provided. The valve 75 is seen to open / close before, which is generally closed and zweckmäßi sarily opened to deploy sludge and coagulum from the electrolysis bath 70 in the activated sludge tank 61 .

The activated sludge tank 61 contains a magnet 61 A. The magnet 61 A receives the Koagu lat formed in the electrolytic bath 70 of the phosphorus compound. The waste water treatment apparatus of this embodiment can thus more reliably remove the phosphorus compound from the waste water. The magnet 61A absorbs the accumulating phosphorus compound in an oxidized state. After this exporting approximately example of the magnet 61 A forms an adsorbent in the form of a magnetic component.

Similar to the above-mentioned electrodes 41 and 42, the upper portions of the electrodes 71 and 72 through the Elek trodenhalteteile 71 A and 72 A maintained, the shape of the electrode holding parts 41 A and 42 A is similar.

The electrode holding parts 71 A and 72 A also have pairs of connecting pieces and each contain the wires 73 A, which are similar to the electrode holding parts 41 A and 42 A.

The electrode holding parts 450 similar electrode holding parts 71 A and 72 A are further formed with notch portions which can each engage with the upper portions of the electrodes 71 and 72 .

According to this embodiment, the activated sludge tank 61 supplies active sludge to the electrolytic bath 70 together with treated water. A reaction product according to the above formula (4) coagulates relatively easily from a core of the active sludge from the activated sludge tank 61 and increases in size. Therefore, the reaction product according to the above formula (4) is easily sedimented as a coagulate, and hence an electrolytic reaction of the electrodes 71 and 72 readily takes place even if the treatment is carried out in the electrolytic bath 70 for a long period of time. The distance between the electrodes 71 and 72 is preferably at least 2 cm in consideration of the size of the slurry.

The settling tank 67 empties the sludge water of the supplied led, treated water through an outlet 78th The mud 68 collects at the lower portion of the Absetzbec kens 67th This sludge 68 is periodically removed from the settling basin 67 .

The waste water treatment apparatus according to this embodiment, which has the magnet 61 A, depending on their size, can achieve a high excretion ratio of the phosphorus compound of about 90 to 95%.

Third embodiment

It will now be the third embodiment of the present described the invention.

Referring to FIG. 10, an activated sludge storing the activated sludge tank 81 receives sewage from another upstream through an inlet 89 . At the lower portion of the activated sludge tank 81 , a first air diffusion pipe 82 is disposed. The first air diffusion tube 82 is connected to a first blower 85 to deflate the air supplied from the first blower 85 through air holes.

The one end of a circulation pipe 83 is inserted in the activated sludge tank 81 , so that a pump 84 aufberei tetes water from the activated sludge tank 81 through the Zirku lationsrohr 83 an electrolysis bath 90 supplies. A Advek tion tube 98 with membranes 97 at its front Endab cut is arranged in the activated sludge tank 81, to plunge into the activated sludge tank 81, the membranes 97th A pump 87 discharges treated water from the activated sludge tank 81 through the membranes 97 and the advection tube 98 . The membranes 97 may be formed, for example, by flat membranes or hollow fiber membranes having a pore size of about 0.05 to 1 μm.

The electrolytic bath 90 includes the electrodes 91 and 92 , which may be made of iron or aluminum. The elec trodes 91 and 92 are connected to a power supply unit 93 and are electrolytically decomposed to supply the Elek trolysebad 90 iron ions or aluminum ions. A second air diffusion tube 94 is disposed below the electrodes 91 and 92 in the electrolytic bath 90 . The second air diffusion tube 94 is connected to a second blower 86 to empty the air supplied from the second blower 86 to a region around the electrodes 91 and 92 from air gaps. Under the second air diffusion tube 94 , a valve 95 is provided. The valve 95 is provided for Publ NEN / closable, so that it is generally ge closed and is conveniently opened to drain sludge and coagulum from the electrolysis bath 90 in the loading livestock tank 81 . Sludge that accumulates at the lower part of the activated sludge tank 81 is removed periodically.

Similar to the above-mentioned electrodes 41 and 42, the upper portions of the electrodes 91 and 92 through electric denhalteteile (not shown) held whose shape is similar to the electrodes support parts 41 A and 42 A.

The membranes 97 are attached to a magnet 97 A. The structure of the membranes 97 and the magnet 97 A will now be described in detail. Fig. 11 is a side view in section showing one of the membranes 97 and the magnet 97 A.

Referring to Figs. 10 and 11, the magnet 97A is in the shape of a pill. The membranes are mounted so that they cover a central opening of the magnet 97 A of the front surface and the rear surface. Fig. 12 is a partial perspective view of the magnet 97 A. The magnet 97 A is provided at its upper portion with an opening which verbun with one end of the advection tube 98 is the. In the waste water treatment apparatus according to this embodiment, the waste water reaching an area near the magnet 97 A is passed through the membranes 97 into the advection pipe 98 .

According to this embodiment, the magnet 97 is provided A near the diaphragms 97 to receive the coagulate of Phos phorverbindung and to prevent it reaches the diaphragm 97, whereby it can be prevented that the membranes clog 97th

This embodiment can be considered as the one which replaces the settling tank 67 in the second embodiment with the membranes 97 , for example. Thus, the waste water serbehandlungsvorrichtung can be made more compact.

May, for example the waste water treatment apparatus according to this execution a high excretion ratio for Phos phorverbindungen of at least 90% can be achieved in that it includes the magnet 97 A and the waste water by Mem branes 97 filters.

In the above embodiment, the magnet 97 A forms an adsorbent in the form of a magnetic element. The membranes 97 form filters for filtering the waste water in the activated sludge tank 81 . While 97 A, and the membranes 97 are provided integrally in this embodiment, the magnet, the present invention is not necessarily limited to this structure. The magnet 97 A and the Mem branes 97 , which are preferably provided in one piece, must not necessarily be provided in one piece, provided that they are provided in close proximity to each other.

Fourth embodiment

It will now be the fourth embodiment of the present described the invention.

Referring to Fig. 13, a diaphragm 107 divides a slurry tank 101 into an activated sludge storing portion and a portion storing no activated sludge. A part under the diaphragm 107 is not connected to the activated sludge tank 101 , but forms a space allowing movement of sewage and sludge. The activated sludge tank 101 receives sewage from another device through an inlet 109 . At the lower part of the activated sludge tank 101 , a first Luftdiffusi onsrohr 102 is arranged. The first air diffusion tube 102 is connected to a first blower 105 to deflate the most blower 105 he supplied air through air openings.

One end of the circulation pipe 103 is inserted into the activated sludge tank 101 . A pump 104 prepares prepared water from the activated sludge tank 101 through the circulating tube 103 to an electrolytic bath 110 . The sludge water of the treated water is discharged through an outlet 118 from the activated sludge tank 101 .

The electrolytic bath 110 includes the electrodes 111 and 112 , which may be made of iron or aluminum. The electrodes 111 and 112 are connected to a power supply unit 113 for supplying iron ions or aluminum ions to the electrolytic bath 110 by electrolysis. Under the electrodes 111 and 112 in the electrolytic bath 110 , a two tes air diffusion tube 114 is disposed. The second air diffusion pipe 114 is connected to a second fan 106 to discharge the air supplied from the first blower 106 to a region around the electrodes 111 and 112 by air openings. Under the second air diffusion tube 114 , a valve 115 is provided. The valve 115 is provided for Publ NEN / closable, which is generally closed and is conveniently opened to deploy sludge and coagulum from the electrolytic bath 110 in the activated sludge tank 101 .

On the surface of the diaphragm 107 , which stores no active sludge, a magnet 107 A is attached. The magnet 107 A may effectively collect the coagulum of a phosphorus compound from those stored in the electrolytic bath 110 .

According to this embodiment follows that the phosphorus compound can be collected in a readily regenerable state from the waste water, by causing that the magnet 107 A receives the coagulate in the Phosphorver bond. Thus, it can be expressed that the waste water treatment apparatus according to this embodiment can contribute to high-efficiency regeneration of phosphorus today when phosphor output is increasingly deteriorated.

The above sewage treatment apparatus according to the embodiment has a structure achieved by providing the settling tank 67 in the activated sludge tank 61 of the sewage treatment apparatus shown in FIG. 9 with the diaphragm 107 .

The sewage treatment apparatus according to this embodiment example, depending on their size a high Excretion ratio of phosphorus compounds of about Reach 90 to 95%.  

Fifth embodiment

It will now be the fifth embodiment of the present described the invention.

Referring to Fig. 14, the overall structure of a sewage treatment apparatus according to this embodiment is substantially similar to the structure of the sewage treatment apparatus shown in Fig. 9, and therefore, elements similar to those of the sewage treatment apparatus shown in Fig. 9 are given the same reference numerals a superfluous description is not repeated.

In the waste water treatment apparatus according to this embodiment, a pump 64 supplies treated water from an activated sludge tank 61 through a circulation pipe 63 to an electrolytic bath 70 . The muddy water of the upgraded water is passed from the electrolysis bath 70 through an outlet pipe 76 into a settling tank 67 . The Absetzbec ken 67 buffers the sludge water from the wastewater treatment device through an outlet 78 .

At the provided in the settling tank 67 outlet pipe 76 , a magnet 67 A is clamped. Thus, the magnet 67 A recorded in the electrolysis bath 70 coagulate from a phosphorus compound in a ge of other coagulum and sludge separated state more effectively record. Therefore, the waste water treatment apparatus of this embodiment may possibly further contribute to an effective regeneration of phosphor as compared with the fourth embodiment.

Sixth embodiment

Now, the sixth embodiment of the present Invention described.

Referring to Fig. 15, the overall structure of a sewage treatment apparatus according to this embodiment is substantially similar to the structure of the sewage treatment apparatus shown in Fig. 13, and therefore elements similar to those of the sewage treatment apparatus shown in Fig. 13 are denoted by the same reference numerals net, whereby a superfluous description is not repeated.

In the sewage treatment apparatus according to this embodiment, the diaphragms 107 and 150 divide a slurry tank 101 into an area where activated sludge is stored, an area where the electrodes 111 and 112 are accommodated, and a downstream area of the inlet 109 the sludge 108 settles.

Waste water supplied from the inlet 109 is stored in the area which receives sludge in the activated sludge tank 101 , and the sludge water from this area is supplied to the area receiving the electrodes 111 and 112 .

The treated water and coagulum are supplied from a tie ferliegenden portion of the electrode 111 and 112 on receiving area in the area in which sludge 108 settles, while sludge water is rich in this area from the activated sludge tank 101 discharged through an outlet 118 .

On a wall surface of the diaphragm 150 , which is closer to the area where the slurry 108 settles, a magnet 150 A is clamped. Thus, the magnet in which the electrodes 111 and 112 receiving area coagulum formed of a phosphorus compound may be 150 A further inde pendent record from remaining coagulates and the slurry more sam.

The treated water discharged from the activated sludge tank 101 is preferably supplied to a separately provided anaerobic filter bed tank (a tank storing anaerobic microorganisms).

In the activated sludge tank 101 , a sidewall including the area where the sludge 108 settles tends to easily supply this sludge to the area where the activated sludge 108 is stored.

Seventh embodiment

A sewage treatment apparatus according to a seventh embodiment of the present invention can incorporate manholes with electrodes. Fig. 16 shows the Abwas water treatment device according to this embodiment, which is made in which the structures of the portions around the manholes 28 and the electrodes 41 and 42 in the wastewater treatment apparatus around in Fig. 1 are modifi ed. Therefore, the elements of the wastewater treatment device according to FIG. 1 are denoted by similar reference numerals, and redundant description will not be repeated.

Referring to FIG. 16, the upper portion of the sewage treatment apparatus is covered with a plurality of manholes 28 . The electrodes 41 and 42 are ren by isolators 400 attached to the manholes 28 . The manner in which the electrodes 41 and 42 are attached to the insulators will now be described.

In the waste water treatment apparatus according to this embodiment, the electrodes 41 and 42 are attached to the manifolds 28 through the insulators 400 . More specifically, the electrodes 41 and 42 are fixed to the insulators 400 by screwing. The insulators 400 provided with the electrodes 41 and 42 are fixed to the manholes 28 by screwing or the like. The electrodes 41 and 42 are connected to the power supply unit 38 by connecting wires 402 , respectively. Thus, a technician can remove the electrodes 41 and 42 on the floor by the handles 28 A of the manholes 28 actuated and the manholes 28 are removed. In other words, the technician can maintain the electrodes 41 and 42 much more easily compared to waste water treatment devices according to the remaining embodiments.

The waste water treatment apparatus according to this embodiment, for example, is formed so that the electrodes 41 and 42 are immersed in the treated water, while the iso insulators 400 are not immersed in the treated water. Each insulator 400 may receive a connection wire having terminals at both ends thereof, so that these terminals are connected to the power supply unit 38 and the electrodes 41 and 42 , respectively. In this case, it is possible to prevent immersed portions of the electrodes 41 and 42 and the power supply unit 38 from being immersed in the treated water. In other words, corrosion of the joined portions can be prevented.

When mounted on the manholes 28 , the electrodes 41 and 42 of the waste water treatment apparatus according to this embodiment can be arranged at positions higher than those of the electrodes in the remaining embodiments. If the electrodes 41 and 42 are arranged in high Po positions, they will not be immersed in the treated water and will not be supplied with iron ions or aluminum miniumionen when applying voltages. In this embodiment, however, by observing the voltage values of the electrodes 41 and 42 by a de tektionsteil 38 A can be determined whether the electrodes 41 and 42 are immersed in the treated water or not. The waste water treatment apparatus according to this embodiment preferably has means indicating that the electrodes 41 and 42 are not immersed in the treated water when this condition is detected by the voltage values of the electrodes 41 and 42 .

Eighth embodiment

Figs. 18 and 29 illustrate a sewage treatment system according to an eighth embodiment of the present invention. Referring to Fig. 18, elements identical to those of the sewage treatment system described with reference to the first embodiment (see Fig. 1) will be described denote the same reference numerals, wherein a superfluous description is not repeated. Referring to Fig. 19, the components shown in Fig. 18 are partially omitted.

Referring to FIGS . 18 and 19, the sewage treatment system according to this embodiment is mainly constituted by a tank 200 . A first partition wall 2 , a second partition wall 3 , a third partition wall 4 and a fourth partition wall 20 divide the tank 200 into a first tank 5 with anaerobic filter bed, a second tank 10 with anaerobic filter bed, a contact aeration tank 14 , a Absetzbec ken 19 and a Disinfection tank 21 . In the tank 200 of the waste water treatment system according to this embodiment, the lower end of the third partition wall 4 is separated from the lower part of the tank 200 , instead of the third advection onsrohrs 29 and the first pump 18 , which are provided on the tank 1 shown in Fig. 1. Thus, in the contact ventilation tank 14 aerobically degraded, treated water is fed to the sedimentation tank 19 in the tank 200 .

The upper end of a first air diffusion tube 16 is connected to a first blower 17 . The lower end of the first air diffusion tube 16 is provided so as to extend around a portion slightly inward beyond the outer circumference of the lower surface of the contact aeration tank 14 , as will be described later (see FIG. 19). On the lower surface of the first air diffusion tube 16 a plurality of holes 16 a (see Fig. 19) are formed. The holes 16 a give the air supplied from the first blower 17 as bubbles. As compared with the holes formed on the upper surface or the side surface, sludge scarcely enters holes 16 a formed on the lower surface of the first air diffusion tube 16 .

The contact aeration tank 14 has at its lower section from a pump 133 . To the upper part of the pump 133 , a mud return path 134 is connected, while another mud return path 135 is connected to the upper end of the mud return path 134 , which extends to the left in FIG . Thus, the sludge formed in the contact aerating tank 14 is supplied to the first tank 5 with an aerobic filter bed.

In the tank 200 shown in Fig. 18, the settling tank 19 and the first tank 5 with an anaerobic filter by a first return pipe 24 is connected to each other. In the first return pipe 24 , a second air diffusion tube 25 is seen before. The second air diffusion pipe 25 is connected to a second blower 26 and formed with blowing ports for blowing in air. The second air diffusion tube 25 blows the air supplied from the second blower 26 through the injection ports to supply treated water from the settling tank 19 through the first return pipe 24 into the first tank 5 having an anaerobic filter bed.

An electrolytic unit enclosing a housing 54 is provided at the upper portion of the contact aeration tank 14 . More specifically, the housing 54 is a hollow body which is connected to four vertical plate members. In the housing 54 , two electrodes 51 and 52 are provided. The two electrodes 51 and 52 are each connected to a power source 57 . In each case a third air diffusion tube 53 is provided. The third air diffusion tube 53 is verbun with a fourth fan 56 .

In the housing 54 , metal ions such as iron ions or aluminum ions are dissolved out by an electrolytic reaction in the two electrodes 51 and 52 . Thus, the metal ions dissolved out react with a phosphorus compound contained in the treated water to form and coagulate a metal salt which is easily soluble in the water present in the contact aeration tank 14 . The metal ions react, for example, with the phosphorus compound according to the above formula (4).

Now, the structure of the electrolytic unit according to this embodiment will be described with reference to FIGS. 20 and 21. Fig. 20 is a perspective view of the electrolytic unit. Fig. 21 is a perspective view of the electrolytic unit in disassembled parts.

The housing 54 has at four portions of its upper En of the fasteners 541 , 542 , 543 and 544 . A diaphragm 540 separates the housing 54 into two horizontal spaces. A third air diffusion tube 53 is inserted into the housing 54 from top to bottom. The third air diffusion tube 53 has a portion extending along the lower portion of the housing 54 to the left he stretches.

The electrode pairs 51 and 52 each contain entgegenge set electrode pairs 511 and 512 and 521 and 522nd In the electrode pair 51 and 52 , the upper ends of the ent opposite pairs of the electrodes 511 and 512 and 521 and 522 to the electrode holders 510 and 520 BEFE Stigt. Further, in the electrode pair 51 and 52 , the upper ends of the opposed electrode pairs 511 and 512, and 521 and 522 are connected to the power source 57 (see Fig. 18) through terminals 513 and 523 .

Both ends of the electrode holders 510 and 520 are each Weil to the fastening parts 541 , 542 , 543 and 544 is introduced to clamp the electrodes 511 and 512 and the electrodes 521 and 522 respectively on the right side and the left side of the diaphragm 540 . The electrodes 511 and 512 electrolytically react on the right side of the diaphragm 540 , while the electrodes 521 and 522 on the left side of the diaphragm 540 electrolytically react.

The third air diffusion tube 53 discharges bubbles that collide with the inner wall of the housing 54 , thereby causing convection. Thus, the treated water is effectively supplied around the electrodes 511 , 512 , 521 and 522 . According to this embodiment, the third air diffusion tube 53 forms a stirring means for stirring the housing 54 enclosed by the Ge space. The Rührein direction is not limited to the bubbles donating third Luftdif fusion tube 53 , but it may be formed by a device as ago as a stirrer, which stirs water in the housing 54 .

The metal ions released by the above-mentioned electrolytic reaction react with the phosphorus compound contained in the treated water to form a water-soluble metal salt. On the other hand, the housing 54 is a hollow body as described above. In other words, the housing 54 is bottomless. Therefore, the metal salt formed therein is rapidly led to the contact aeration tank 14 by its own weight.

In the above-mentioned embodiment, the electro-lytic unit is provided in the contact aeration tank 14 . Alternatively, the electrolytic unit may bed in another tank such as the first tank 5 with anaerobic filter, the second tank with anaerobic filter bed or settling tank 19 may be provided in the tank 200 . According to this embodiment, the sedimentation tank 19 forms a sedimentation sedimentation basin. The electrolytic unit may alternatively be provided outside of the tank 200 , so that it is at the inlet 6 or the outlet 23 is arranged.

The circulation flow rate of the tank 200 is 3Q, where Q represents the amount of water flowing into the tank. In other words, the tank 200 circulates water in a three times larger amount of the water flowing therein.

Electrode pair 51 and 52 react electrolytically so that the concentration of dissolved iron ions or aluminum ions is about one to three times the molar concentration of phosphorus in treated water. The above electrolytic reaction is controlled so that the concentration of iron ions or aluminum ions is preferably one to two times, more preferably 1.5 times, the molar concentration of phosphorus in treated water. Therefore, in the electrolytic reaction, the current density in the electrodes 511 , 512 , 521 and 522 is controlled to be at least 0.1 mA / cm ² , generally about 0.3 mA / cm ² .

It is quite possible to prevent the surfaces of the electrodes 511 , 512 , 521 and 522 from forming oxide layers or organic deposits or removing them by controlling the current density at the electrodes 511 , 512 , 521 and 522 . Oxide and organic deposits possibly formed on the anodes may well be removed with hydrogen gas generated at the cathodes and through the third air diffusion pump 53 . Therefore, if the current density of the above-mentioned electrolytic reaction is too small, the amount of hydrogen gas generated at the cathodes may be so low that deposits from the anodes can not be sufficiently removed. The size of the vent in the third air diffusion pump 53 is set at about 15 L / min in the electrolytic unit.

Provided that the amount of fecal waste water flowing into the tank 200 is 1200 l per day and the circulation rate in each tank of the tank 200 is 6000 l, for example, the current supplied to the electrodes 511 , 512 , 521 and 522 becomes controlled to about 650 mA. The current density in each electrode can be controlled by changing the area immersed in the treated water. The spaces between the electrodes 511 and 512 and between the electrodes 521 and 522 are set to about 25 mm, and the voltages of the electrodes 511 , 512 , 521 and 522 are regularly monitored. The polarity of each electrode is preferably reversed every prescribed time (eg, 24 hours).

Ninth embodiment

Fig. 22 illustrates a waste water treatment system according to a ninth embodiment of the present invention, which is prepared by changing the arrangement of the electrolytic unit in the waste water treatment system shown in Fig. 18 with adding some elements. With reference to Fig. 22, therefore, elements identical to those in Fig. 18 are denoted by the same reference numerals, and a redundant description is not repeated.

Referring to Fig. 22, an electrode unit including a pair of electrodes 51 and 52 is clamped over a first tank 5 having an anaerobic filter bed.

A settling tank 19 comprises a third advection pipe 38 and a pump 39 . Treated water flows from a contact aeration tank 14 through the third advection tube 38 into the sedimentation tank 19 . A pump 39 stimulates this flow.

The pair of electrodes 51 and 52 is disposed in an electrolytic bath 59 . The electrolysis bath 59 is connected to a first return pipe 24 . Thus, the treated water from the sedimentation tank 19 is passed through the first return pipe 24 into the electrolytic bath 59 .

The electrolysis bath 59 has at its upper left section from an outlet tube 592 on. The muddy water of the treated water fed into the electrolytic bath 59 flows through the outlet pipe 592 into the first anaerobic filter bed tank 5 .

The electrolysis bath 59 also has at its lower section from an outlet 591 . In the first aerobic filter tank 5 , a phosphor recovery unit is inserted under the electrolytic bath 59 so as to be adjacent to the electrolytic bath 59 .

In the electrolytic bath 59 , the two electrodes 51 and 52 react electrolytically to form metal ions, which in turn react with treated water to form a readily soluble metal salt, as described with reference to the eighth exemplary embodiment. The easily soluble metal salt is passed through outlet 591 into phosphorus recovery unit 160 due to its own weight. In other words, the phosphor recovery unit 160 can selectively recover the easily soluble metal salt.

Fig. 23 is a sectional view of the phosphorus recovery unit 160 is. The phosphor recovery unit 160 includes a structure 164 , nets 162 and 163 , an advection tube 161 and adsorbents 165 . The adsorbents 165 disposed between the nets 162 and 163 to adsorb fine grains of the above easily soluble metal salt are made of activated carbon or ceramics. Treated water and metal salt are passed from electrolysis bath 59 through networks 162 and 163 into structure 164 . The muddy water contained in the body 164 is discharged through the advection tube 161 from the body 164 into the first anaerobic filter bed 5 .

In the above-mentioned embodiment, the recovery unit 160 for phosphorus is provided downstream of the electro-lytic unit so as to be adjacent thereto. Thus, the easily soluble metal salt formed in the electrolytic bath 59 is collected at the lower part of the structure 164 or taken up by the adsorbents 165 in the phosphor recovery unit 160 . In other words, the sewage treatment system of this embodiment can recover the easily soluble metal salt which is not to be mixed with the sludge. The adsorbents 165 can recover fine grains of the metal salt, and thus the efficiency of recovering the metal salt can be improved.

According to this embodiment, the electrolytic unit and the phosphor recovery unit 160 are provided in the first anaerobic filter bed tank 5 . The electrolytic unit may alternatively be provided in another tank such as the second anaerobic filter bed tank 10 , the contact aeration tank 14, or the settling tank 19 in the tank 200 . Further, the electrolytic unit may alternatively be provided outside the tank 200 so as to be adjacent to the inlet 6 or the outlet 23 . According to this embodiment, the recovery unit 160 for phosphorus can significantly show its effect when the electrolytic unit and the recovery unit 160 for phosphorus are provided in the first tank 5 with anaerobic filter bed serving as a removal tank for additions. When the electrolytic unit is provided in the first anaerobic filter bed 5 without phosphorus recovery unit 160 , it may be difficult to recover the easily soluble metal salt as a simple substance as compared with the case where the electrolytic unit is subjected to the same conditions in another tank.

Tenth embodiment

Referring to Fig. 24A, feces waste water is first introduced into the precipitation / separation tank 601 . The precipitation / separation tank 601 mainly removes wastewater anaerobically.

The waste water is introduced from the precipitation / separation tank 601 into a contact tank 602 with turntable. The contact tank 602 with turntable degrades the wastewater mainly aerobically. An aerobic filter bed used for an increase in the volume of aerobic bacteria is rotated in the turntable contact tank 602 .

The waste water is introduced from a contact tank 602 with turntable in a settling tank 603 . The settling tank 603 is provided to separate the sludge contained in the sewage of liquid. The sludge deposited in sedimentation tank 603 is fed to the precipitation / separation tank 601 by known means.

The wastewater is discharged from the settling tank 603 in a section between them lying Durchflußkontrolltank 604th The intermediate flow control tank 604 is provided for controlling the flow rate of the waste water, which is introduced into a later-described electrolytic bath 605 .

The waste water is introduced from the intermediate flow control tank 604 in the electrolysis bath 605 . The electrolytic bath 605 forms metal ions for reaction with egg ner prescribed component of the waste water by elec trolytisches disassembly of electrodes. The structure of the electrolysis bath 605 will be described later in detail.

The waste water is introduced from the electrolysis 605 34658 00070 552 001000280000000200012000285913454700040 0002010040416 00004 34539in a Koa gulationstank 606 . The coagulation tank 606 is mainly intended for the reaction of the metal ions formed in the electrolytic bath 605 with the prescribed component of the wastewater and forming flakes. In other words, the metal ions react with the prescribed component of the waste water in the coagulation tank 606 . For example, when iron ions are leached out by electrolytic reaction, the reaction possibly takes place in accordance with the above formula (4).

In coagulation tank 606 , in the presence of metal ions, flakes of particles which are not dissolving in water but are suspended, however, are also formed (the so-called "SS"). The coagulation tank 606 is preferably stirred suitably to form the flakes.

The waste water is introduced from the coagulation tank 606 together with the resulting from the above reaction flakes in a coagulation tank 607 . The coagulation tank 607 is provided to sediment the flakes formed in the coagulation tank 606 .

The waste water is introduced from the coagulation tank 607 into a disinfection tank 608 . The disinfection tank 608 stores a chlorine chemical or the like. The disinfection tank 608 is provided for disinfecting the waste water with the chemical. Subsequently, the stored water from the disinfection tank 608 is introduced into a flow or the like. While contained in the waste water ner phosphorus as phosphoric acid or organic phosphorus, the ent from the disinfection tank 608 emptied, treated water has a total phosphorus concentration of 1 mg / l.

Fig. 24B shows another treatment performed by substituting the electrolytic bath 605 and the coagulation tank 606 shown in Fig. 24A with a coagulation tank 615 to form metal ions in the aggregation tank 615 and reacting the metal ions with a pre-written component in the wastewater, whereby flakes are ge forms.

Referring to each of Figs. 24A and 24B, the precipitation / separation tank 601 , the turntable contact tank 602 , and the settling tank 603 are surrounded by broken lines. The treatment carried out in the area with the broken lines R can be modified as shown in FIG .

Referring to FIG. 25, waste water from the precipitation / separation tank 601 is introduced into a contact aeration tank 620 . In the contact aeration tank 620 mainly remove aerobic bacteria from the wastewater. A provided in Kontaktbelüf processing tank 620 aerobic filter bed is unlike the contact tank 602 with turntable (see Fig. 24A or 24B) is not rotated.

The waste water is introduced from the contact aeration tank 620 into a settling tank 603 . Sludge and biomembranes adhered to the aerobic filter bed and separated by aeration in the contact aeration tank 620 are supplied by known means into the precipitation / separation tank 601 and into the settling tank 603 .

A tenth embodiment of the present invention will now be described as an apparatus for carrying out the treatment of the flowchart in FIG. 24A. An apparatus for performing the treatment of the flowchart in FIG. 24B will be described later as the eleventh embodiment of the present invention ,

The coagulation apparatus according to the tenth embodiment includes at least the electrolytic bath 605 , the coagulation tank 606 and the chemical precipitation tank 607 shown in FIG. 24A.

Fig. 26 illustrates the appearance of a part of a combined sewage purification tank with the coagulation apparatus according to this embodiment. From a prescribed water tank, waste water is introduced into the interposed flow control tank 604 through a pipe 11 . The intermediate flow control tank 604 introduces the waste water through a pipe 12 into the electrolytic bath 605 . The electrolytic bath 605 introduces the wastewater through a pipe 13 into the coagulation tank 606 . The coagulation tank 606 passes the waste water by a prescribed pipe in the tank 607 for chemical precipitation 607 (not shown). The coagulation device controls the residence time of the waste water in each tank, for example by adjusting the capacity of each tank.

FIG. 27 is a disassembled perspective view of the electrolytic bath 605 shown in FIG. 26. FIG . The electrolytic bath 605 is mainly constituted by a box 650 , an electrode fixing plate 653 , a plurality of electrode pairs 651, and a lid 652 .

A box mount 600 holds the box 650 . A waste water inlet port 650 A and a Abwasserauslaßanschluß 650 B are formed on the side surfaces of the box 650 . The sewage flows through the sewage inlet port 650A into the box 650 and is discharged through the sewage outlet port 650B.

In box 650 , an air diffusion tube 654 is disposed. An off-the-box prescribed pump introduces air into the air diffusion tube 654 . The air diffusion tube 654 is expediently formed with small holes. Thus, the air diffusion tube 654 may deliver bubbles into the box 650 .

The box 650 receives the electrode mounting plate 653 and electrode pairs 651 . Each electrode pair 651 ent holds a holder 710 , are attached to the two flat electrodes 711 and 712 . The electrode fixing plate 653 is formed with holes 731 to 736 to receive the electrodes 711 and 712 therein. The electrodes 711 and 712 are set in the box 650 in the holes 731 to 736 , so that the holder 710 of each electrode pair 651 comes into contact with the upper surface of the electrode fixing plate 653 . Each electrode pair 651 has a connecting piece 719 C to connect the electrodes 711 and 712 to a power source provided outside the electrolytic bath 605 .

The upper surface of the electrode pair 651 and the elec trodenbefestigungsplatte 653 receiving box is covered with the lid 652 .

Each of the electrodes 711 or 712 is made of a metal such as iron or aluminum. The electrolytic bath 605 may, due to the electrolytic reaction, supply each of the electrodes 711 or 712 in each electrode pair 651 with metal ions such as iron ions or aluminum ions into the sewage. If the box 650 takes the pairs of electrodes 651, which supplied through the small holes of the pipe 654 Luftdif fusion bubbles remove deposits from the surfaces of the electrodes 711 and 712th

Referring to Figs. 28 and 29, the structure of each pair of electrodes will be described in detail. FIG. 28 is a perspective view of the pair of electrodes 651. FIG . FIG. 29 is a partial fragmentary perspective view of the pair of electrodes 651 .

The electrode pair 651 comprises two metal plates forming the electrodes 711 and 712 . The metal plates are made of, for example, iron or aluminum. The electrode pair 651 further includes the holder 710 . At the upper portion of the bracket 710 , a handle 710 A is attached. At the lin ken side surface of the bracket 710 , a cover 713 is attached. More specifically, the cover 613 is formed with six bolt holes that receive prescribed bolts to secure the cover 713 to the left side surface of the bracket 710 . The electrode 711 is BEFE with nuts 711 A and 711 B on the cover 713 Stigt. The above-mentioned screw holes include the screw holes 713 A, 713 B (see FIG. 30), 713 C, 713 D and 713 E. The above-mentioned prescribed screws close the screws 717 A, 717 B, 717 C shown in FIG and 717 D.

At an upper, rear portion of the bracket 710 , a guide 719 D is mounted, from which a wire 719 projects upwardly along the bracket 710 . The wire 719 ver passes through the guide 719 D, which has a cylindrical shape. The connector 719 C is connected to one end of the wire 719 .

A arranged below the guide 719 D part of the wire 719 tes is accommodated in a combination of the holder 710 and the cover 713 . The wire 719 includes a plurality of wires (including a later-described wire 719 A). At the other end of the wire 719 , terminals such as the terminal 718 described later (see Fig. 30) are fixed to the corresponding one of a plurality of wires.

FIGS. 30 and 31 are partial fragmentary representations per-perspective exploded parts of the electrode pair 651st With reference to FIG. 31, the wire 719 , the connector 719 C, the wire 719 A, and the terminal 718 are omitted for convenience.

Referring to Figs. 30 and 31, the electrode pads 715 and 716 made of iron or stainless steel are provided between the cover 713 and the holder 710 . The electrode mounts 715 and 716 are preferably made of a conductive, corrosion resistant material.

The electrode mount 715 is a plate formed with protrusions 715 A and 715 B. The projections 715 A and 715 B Kings nen through holes, which forms out in the cover 713 are. The electrode 711 is fixed so as to be electrically connected to the projections 715 A and 715 B by the nuts 711 A and 711 B.

The terminal 718 is provided slightly behind the central portion of the bracket 710 between the electrode mounts 715 and 716 . The terminal 718 forms the end of the wire 719 A. The wire 719 A is one of several wires contained in the wire 719 .

The terminal 718 is disposed at a position to come into contact with the projection 715 A, when the electric denbefestigung 715 is fixed to the cover 713 , where the cover 713 is attached to the holder. Thus, the electrode 711 is electrically connected by the projection 715 A to the circuit 718 .

The electrode mount 716 is also formed with protrusions that are similar to the protrusions 715 A and 715 B. The protrusions project on the left side surface of the bracket 710 . A terminal 718 different terminal is slightly before the central portion of the holding tion 710 between the electrode mounts 715 and 716 is provided. This terminal forms one end of the other wire, which is different from the wire 719 A, of the several wires contained in the wire 719 . This wire is electrically connected to the attachment to the Elektrodenbe 716 formed projections, which are connected to jumps before the electrode 712 . Thus, the terminal is electrically connected to the electrode 712 .

Both between the electrode mounts 715 and 716 and between the terminal and the terminal 718 , an insulator (not shown) is provided. Thus, it can be reliably prevented that the electrodes 711 and 712 in the combination of holder 710 and cover 713 are short-circuited with each other.

The screws 714 A, 714 B, and 714 C clamp the electrode fastener 715 to the cover 713 . The 714 D, 714 E and 714 F screws clamp the electrode mount 716 to the bracket 710 .

Between the bracket 710 and the cover 713 except half of the portion to which the cover 713 is screwed, a seal 710 B is provided. A further seal 710 C is provided between bracket 710 and mounting electrodes 716 outside the portion at which the Elek trodenbefestigung is screwed 716th Further, a gasket 710 C-like seal between the cover 713 and the electrode attachment 715 is provided outside the portion to which the electrode attachment 715 is screwed.

Therefore, the holder 710 and the cover 713 , when combined with each other, the terminal 718 take on, with no water will penetrate into the above-mentioned connection.

The electrolytic bath 605 with the electrode pairs 651 may supply the above-mentioned metal ions. The metal ions supplied from the electrolytic bath 605 are supplied into the coagulation tank 606 together with the waste water. In the coagulation tank 606 , the metal ions and the waste water react with each other to form flakes of metal salt of phosphorus or the like. The flakes are 607 supplied together with sewage tank for chemical precipitation and sedimentation in the tank 607 for chemical precipitation 607th

In the above embodiment, the coagulation tank 606 forms a first tank for reacting denitrified treated waste water with metal ions and for coagulating separation products resulting from this reaction. The chemical precipitation tank 607 forms a second tank that receives the waste water from the first tank to sediment the coagulates formed in the first tank. Fer ner forms the electrolysis 605 an electrolysis bath, which supplies the first tank with metal ions by electrolytic disassembly of electrodes.

In the above embodiment, the with the Wastewater-reactive metal ions through an electrolyti cal reaction of the electrodes supplied. So the Me tallionen compared to the case of supplying Me by adding a coagulant be fed to the wastewater safer. A coagulation Medium and an adjuster for pH levels, for coagulation  added are dangerous, acidic or alkaline Chemicals.

Furthermore, the pH of the wastewater can not be adjusted be, and therefore the metal ions can with the wastewater react more easily than in the case where the Ab water the coagulant is added.

In addition, unlike the case of adding Coagulant to wastewater no place to take egg coagulant required.

An electrolytic reaction of the pair of electrodes 651 is performed so that the concentration of dissolved iron ions or aluminum ions is one to four times the molar concentration of phosphorus in the waste water. The above-mentioned electrolytic reaction is controlled so that the concentration of iron ions or aluminum ions is preferably about 2.5 to 3.5 times, more preferably about 3 times, the molar concentration of phosphorus in the waste water. Therefore, in the electrolytic reaction, the current density in the electrodes is controlled to be at least 0.1 mA / cm ² , generally about 0.3 mA / cm ² .

It is quite possible to prevent formation of thin oxide layers or organic deposits on the surfaces of the electrodes or to remove such thin oxide layers and organic deposits by controlling the current density at the electrodes. Iron hydroxide and organic deposits that may have formed on the anodes may possibly be removed by hydrogen gas generated at the cathodes and vented through the air diffusion tube 654 . Therefore, if the current density in the above-mentioned electrolytic reaction is too small, the amount of hydrogen gas generated at the cathodes may be so low that the deposits can not be sufficiently removed from the anodes. The aeration amount in the air diffusion tube 654 to about 151 / min in the electrolytic unit is turned.

For example, assuming that the amount of fecal effluent flowing in the combined fuming effluent containing the coagulation apparatus of the present invention per day is 10 tons, the current supplied to the electrodes 711 and 712 is controlled to about 12.3 A. Thus, the concentration of iron ions or aluminum ions due to the electrolytic reaction in the electrode pairs 651 may possibly be about three times the molar concentration of phosphorus in the waste water. The current density in each electrode can be controlled by changing the area of the section immersed in the waste water. The gap between the electrodes 711 and 712 is set to about 25 mm in each electrode pair 651 , where the voltages of the electrodes 711 and 712 are regularly monitored. The polarity of each electrode is preferably reversed at each prescribed time (eg, 24 hours).

The residence time of the waste water in the coagulation tank 606 is normally set to at least 20 minutes. The residence time of the waste water in the coagulation tank 607 is normally set to at least three hours. In this embodiment, the residence time in the electrolysis bath 605 is preferably set to at least three minutes. The conditions for the residence time are the results of an experiment for determining the residence time in the electrolysis bath 605 based. This experiment will now be described.

Experiment to determine the residence time in the electrolysis bath 1) Experimental method

Iron was electrolytically decomposed for a prescribed time in an artificial fluid with aeration, and then the artificial fluid was transferred to a sedimentation measuring instrument 700 (see Fig. 32) to obtain precipitation ratios of phosphorus at various depths of the artificial fluid.

The artificial liquid was synthesized artificially to obtain a composition substantially similar to that of waste water normally introduced into the coagulation tank 615 . Table 1 shows the composition of the artificial fluid.

Table 1 Concentration of artificial water

reactant Concentration (mg / l) MgSO _4. 7H ₂ O 5 KCl 6 Na ₂ HPO ₄ . 12H ₂ O 58 CaCl ₂ . 2H ₂ O 6 FeCl ₃ . 6H ₂ O 1 NaNO ₃ 41 NaHCO ₃ 79

In this experiment, iron was in the artificial water decomposed electrolytically, while four electrolysis baths of 31 with aeration at a flow rate of 3.5 l / min in each electrolysis bath were used. At this electrolysis The amount of current supplied to the electrodes was characterized ge regulates that the number of moles of iron ions in the artificial Water was controlled. For example, the number of moles of Iron ions in artificial water at about 2.5 times and  about 3 times the number of phosphorus were adjusted currents of 1.30 A in each electrolysis bath and 1.55 A fed.

Referring to Fig. 32, the sedimentation measuring instrument 700 is mainly formed by a cylindrical storage part 790 capable of receiving a solution.

The storage part 790 is provided on its side surface with solvent extraction parts 791 to 796 which can extract parts of the solution existing in the different depths of the storage part 790 . The solution extraction parts 791 , 792 , 793 , 794 , 795 and 796 may each contain parts of the depths of 0.3 m, 0.5 m, 0.7 m, 0.9 m, 1.1 m and 1.3 m of Extract the water surface existing solution.

2) Results of the experiment

Fig. 33 illustrates precipitation ratios of phosphorus measured at various depths of the sedimentation measuring instrument 700 by electrolyzing iron in the electrolytic baths for 3 minutes, with artificial water being transferred from the electrolytic baths to the sedimentation measuring instrument 700 and 10 minutes ran lan, fast stirring at 150 U / min was carried out and a 10 minutes, slow stirring at 60 U / min was performed. In this electrolysis of three minutes, the amount of energy supply of the electrodes was so controlled that the number of moles of dissolved iron ions was 2.5 times that of phosphorus contained in the artificial water.

Referring to Fig. 33, ○ indicates precipitation ratios of phosphorus, provided that the sedimentation time of coagulates in the sedimentation measuring instrument 700 is 1.5 hours. Referring to Fig. 33, ▲ and ∎ indicate precipitation ratios of phosphorus, provided that sedimentation times of coagulates are 3 hours and 4 hours, respectively. Also in FIGS . 34 to 36 to be described later, ○, ▲, and ∎ indicate precipitation ratios for phosphorus, provided that the sedimentation times of coagulums are 1.5, 3, and 4 hours, respectively.

The precipitation ratio Rp for phosphorus was calculated according to the following formula (5), provided that Cs represents the initial phosphorus concentration in the artificial water and Cd represents the phosphorus concentration at each depth of the artificial water after each sedimentation period:

Rp = {(Cs-Cd) / Cs}. 100 (5)

Referring to Fig. 33, the precipitation ratios of phosphorus at the respective depths extractable by the solution extracting portions 791 to 796 and at a depth (represented by the symbol P in Fig. 32) of 0.05 m the water surface measured. The muddy water may be located at a depth of 0.05 m in sedimentation meter 700 .

Referring to Fig. 33, the precipitation ratios of phosphorus in shallow regions are larger. Provided that sedimentation time for accumulation is at least 3 hours, the phosporous precipitation ratio at each depth is 60% or about 60%.

In general, a leads in the coagulation tank of a kombi stored liquid cleaning tanks about 20 For a few minutes a diffusion through, with the sediment time in a tank for chemical precipitation at least three hours is set.  

If the time of electrolysis to leach out the same amount of iron ions is set to less than three minutes in this experiment, the precipitation ratio for phosphorus at each depth was significantly lower than that shown in Figure 33, even if the sedimentation time in the sedimentation Meter 700 is set to at least three hours. Although the above-mentioned electrolysis was carried out for 3 minutes longer, the precipitation ratio of phosphorus at each depth did not significantly exceed that shown in FIG .

Thus, the residence time of waste water in the electrolytic bath 605 in this embodiment may possibly be set to at least three minutes.

3) Stirring in the coagulation tank

Fig. 34 shows precipitation ratios of phosphorus at respective depths measured when only the stirring (rapid stirring and slow stirring) in the sedimentation measuring instrument 700 is omitted from the experimental conditions which achieve the results shown in Fig. 33.

Referring to Fig. 34, when the sedimentation time is 4 hours, the precipitation ratio of phosphorus in the muddy water is approximately 60%, and on the other hand, the precipitation ratio of phosphorus is about 40%. When the sedimentation time is 3 hours, the precipitation ratio for phosphorus is about 40% to a depth of about 0.5 m from the muddy water, on the other hand, the precipitation ratios for phosphorus are about 35%. When the sedimentation time is 1.5 hours, the precipitation ratio for phosphorus is about 40% in the sludge water, while the precipitation ratio is about 20% at depths of 0.3 m to 0.7 m, and about 15% at depths of each 0.9 m and 1.1 m, whereby phosphorus is scarcely removed at the depth of 1.3 m.

Comparing the results shown in Fig. 34 with those shown in Fig. 33, it follows that the precipitation ratio of phosphorus becomes considerably lower when stirring is not performed in the sedimentation measuring instrument 700 .

Thus, it is possible that the apparatus constituting metal salt of phosphorus and flakes of SS, ie, the coagulation tank 606 of this embodiment, can more easily remove phosphorus and SS from the waste water by conducting agitation.

4) Investigation of the molar number of phosphorus in the waste water and the number of moles of iron dissolved out during the electrolysis ion

Figs. 35 and 36 show precipitation ratios for phosphorus in the respective depths measured when the number of moles of iron ions released in the electrolytic baths has changed from 2 times to 3 times that of phosphorus in the artificial liquids. In other words, the results shown in Fig. 35 were obtained by stirring (rapid and slow stirring) in the sedimentation measuring instrument 700 , while the results shown in Fig. 36 were obtained without stirring in the sedimentation measuring instrument 700 .

With reference to Figs. 35 and 36, precipitation ratios for phosphorus are completely higher when artificial water is agitated in the sedimentation measuring instrument 700 .

However, when the sedimentation time is set to be at least 3 hours, the precipitation ratio in the muddy water is about 80% and, on the other hand, about 70%, despite the stirring in the sedimentation meter 700 .

Thus, it is possible for phosphorus to be removed despite stirring in the coagulation tank 606 with a high efficiency of 70 to 80% when the electrodes are electrolyzed, so that the number of moles of iron ions is 3 times that of phosphorus.

Eleventh embodiment

The eleventh embodiment of the present invention will be described as an apparatus for performing the treatment of the flowchart shown in Fig. 24B.

A coagulation apparatus according to this embodiment comprises at least the coagulation tank 615 and the chemical precipitation tank 607 shown in Fig. 24B. As compared with the sewage treatment apparatus according to the tenth embodiment, the electrolytic bath 605 shown in FIG. 26 may be omitted, and the coagulation tank 606 may be exchanged with the coagulation tank 615 , and the intermediate flow tank 604 may pass sewage through the pipe 12 directly into the coagulation tank 615 Initiate coagulation tank 615 .

The coagulation tank 615 of this embodiment receives an electrolytic unit. The electrolytic unit which supplies metal ions by electrolysis contains the above-mentioned electrode pairs 651 (see FIGS. 27 to 31). Referring now to Fig. 37, the structure of the electrolytic unit accommodated in the coagulation tank 615 will be described. FIG. 37 is a disassembled perspective view of the electrolytic unit accommodated in the coagulation tank 615. FIG .

The electrolytic unit is mainly constituted by the electrode pairs 651 , an electrode fixing part 752 , a flange 753, and a housing 750 .

The housing 750 is a hollow body without bottom. The flange is attached to the upper end of the housing 750 . The electric denbefestigungsteil 752 is attached to the upper surface of the flan cal 753 . In the middle of the Elektrodenbefesti supply part 752 , an electrode attachment hole 755 is formed from. The outer peripheral portion of the Elektrodenbefe stigungslochs 755 has a shape that can come with Endabschnit th of the electrodes 711 and 712 engage. In the coagulation tank 615, the electrode pairs are clamped 651 in that the holders 710 are disposed above the electrode attachment member 752, while the electric are arranged the 711 and 712 below the electrode attachment member 752nd The connecting pieces 719 C of the electrode pairs 651 are suitably connected to a prescribed power source outside the coagulation tank 615 .

The metal ions generated in the coagulation tank 615 react with waste water in the coagulation tank 615 . In the coagulation tank 615 , the metal ions react with the waste water to form metal salts of phosphorus and flakes of SS. The flakes are supplied to the chemical precipitation tank 607 together with the waste water to be coagulated in the chemical precipitation tank 607 .

In the above embodiment, the coagulation tank 615 forms a first tank for reacting denitrified sewage with metal ions and for coagulating precipitates resulting from this reaction. The coagulation tank 607 forms a second tank which receives waste water from the first tank for sedimentation of coagulum formed in the tank.

As has been described with reference to the tenth embodiment, the residence time of the waste water in the electrode-equipped tank is set to at least three minutes. In this embodiment, therefore, the residence time of the waste water in the coagulation tank 615 is preferably set to at least three minutes.

Although the present invention has been described in detail and has been presented, it is clear that this only as a representation and example and not as a restriction kung, whereby the spirit and scope of the present invention only by the terms of the attached Pa tentansprüche are limited.

Claims (17)

A waste water treatment apparatus for treating waste water comprising:
a wastewater treatment wastewater treatment part ( 61 ), wherein
the waste water treatment part includes an adsorption means ( 61A ) having a magnetic member. 2. Wastewater treatment apparatus according to claim 1, in which
the waste water treatment section has an activated sludge tank storing activated sludge tank ( 81 ) and a filter ( 97 ) for filtering waste water in the activated sludge tank, and
the adsorption ( 97 A) in the vicinity of the fil ters ( 97 ) is arranged. 3. waste water treatment apparatus according to claim 2, in which the adsorption ( 97 A) with the filter ( 97 ) is provided integrally. The waste water treatment apparatus according to any one of claims 1 to 3, further comprising an ion supply part ( 70 ) which supplies iron ions or aluminum ions to the waste water treatment part ( 61 ), wherein
the waste water treatment part ( 61 ) comprises a settling tank ( 67 ) for precipitating a coagulum resulting from a reaction between the iron ions or aluminum ions supplied from the ion supply part ( 70 ) and the waste water, and
the adsorption device ( 67 A) is arranged in the settling tank. 5. Wastewater treatment apparatus according to claim 4, in which
the Ionenzuführteil a submerged in the waste water electrode (71, 72), an electrode holder (71 A, 72 A), which holds the electrode without being immersed in the sewage, and a wire (73 A) for connecting the electrode with a Power source includes, and
the wire ( 73 A) with the electrode holder ( 71 A, 72 A) is provided in one piece. 6. wastewater treatment apparatus according to claim 5, in which the electrode holder ( 450 ) with a rich Ausnehmungsbe ( 451 ) is formed, which is in a handle with the electrode. A waste water treatment apparatus ( 200 ) comprising an electrolytic unit ( 51 to 54 ) having an electrode ( 51 , 52 ) for electrolytic disassembly to thereby deposit a phosphorus component contained in the treated water as a metal salt which is easily soluble in water, the Electrolytic unit ( 51 to 54 ) further includes a Ge housing ( 54 ) which covers only the side surfaces of the electrode. 8. waste water treatment apparatus according to claim 7, in which the electrolytic unit ( 51 to 54 ) further comprises stirring means ( 53 ) for stirring a space surrounded by this housing. 9. Wastewater treatment apparatus according to claim 7 or 8, further comprising:
an anaerobic tank ( 5 , 10 ) with anaerobic microorganisms present therein,
an aerobic tank ( 14 ) with aerobic microorganisms present therein, and
a sludge settling tank ( 19 ), wherein
the electrolytic unit ( 51 to 54 ) in the anaero ben tank ( 5 , 10 ), in the aerobic tank ( 14 ) or in the settling tank ( 19 ) is arranged. A waste water treatment apparatus ( 200 ) comprising an electrolytic unit ( 51 , 52 , 59 ) having an electrodepositing electrode thereby to deposit a phosphorus component contained in the waste water as a water-soluble metal salt, the waste water treatment apparatus further comprising a recovery unit ( 160 ) which is provided downstream of the electrolytic unit ( 51 , 52 , 59 ) to the electrolytic unit ( 51 , 52 , 59 ) adjacent to selectively recover the metal salt. A sewage treatment apparatus according to claim 10, wherein the recovery unit ( 160 ) comprises an adsorbent ( 165 ) for receiving the metal salt. 12. Wastewater treatment apparatus according to claim 10 or 11, further comprising a fecal waste water receiving inflow tank ( 5 ), wherein the electrolytic unit ( 51 , 52 , 59 ) and the recovery unit ( 160 ) in the inflow tank ( 5 ) are arranged. 13. Wastewater treatment apparatus according to claim 10 or 11, further comprising:
an anaerobic tank ( 5 , 10 ) with anaerobic microorganisms present therein,
an aerobic tank ( 14 ) with aerobic microorganisms present therein, and
a settling tank ( 19 ) for separating sludge, where at
the electrolytic unit ( 51 , 52 , 59 ) and the recovery unit ( 160 ) outside the anaerobic tank ( 5 , 10 ), the aerobic tank ( 14 ) and the settling tank ( 19 ) are arranged to pass through the anaerobic tank ( 5 , 10 ), the aerobic tank ( 14 ) and the settling tank ( 19 ) to receive treated wastewater. A waste water treatment apparatus comprising a first tank ( 606 ) in which denitrified waste water reacts with metal ions to coagulate a reaction product-forming separation product and a second tank ( 607 ) which receives the waste water from the first tank ( 606 ) to sediment the coagulum formed in the first tank ( 606 ), the coagulation apparatus further comprising an electrolytic bath ( 605 ), which is closed upstream of the first tank ( 606 ), including an electrode ( 711 , 712 ) for containing metal ions in the first tank ( 606 ) zuzufüh ren by the electrode ( 711 , 712 ) is decomposed electrolytically. A waste water treatment apparatus according to claim 14, wherein the electrolytic bath ( 605 ) is formed so that the waste water has a residence time of at least three minutes. A waste water treatment apparatus comprising a first tank ( 606 ) in which denitrified waste water reacts with metal ions to coagulate a reaction product-forming precipitate, and a second tank ( 607 ) which receives the waste water from the first tank ( 606 ) to sediment coagulum formed which in the first tank (606), said first tank (606), an electrode (711, 712) holds ent to supply metal ions in the first tank (606) by the electrode (711, 712) is decomposed electrolytically. 17. Wastewater treatment device according to one of che Ansprü 14 to 16, in the
the electrode ( 711 , 712 ) is powered by a prescribed power source to be electrolytically decomposed,
wherein the coagulation device further comprises:
a wire ( 719 ) connecting the electrode to the prescribed current source, and
an electrode holder holding the electrode ( 710 , 713 ), and
the electrode holder ( 710 , 713 ) receives at least a portion of the wire ( 719 ).