DE1658077C3 - Method of handling Ab - Google Patents

Description

3. Device for carrying out the method- 15 bacteria can be broken down. Hence arise

rc ns according to one of claims 1 and 2 with a housing, with an air filter, with in which Housing any. arranged, plate-shaped electrodes and with means for conveying the air through the housing, characterized thereby. 20 g net that the housing in a suction chamber (6) with a filter (8) and a fan (2). in a discharge chamber (16) with a device, which is connected to the suction chamber (6) for generating silent electrical discharges (26), the electrodes made of aluminum (44. 45) and is divided into an outlet chamber (28) for the addition of ozone that to supply the electrodes (44, 45) with high-voltage electricity i a transformer (38) and for warming de. sucked air a heating device (16) is provided and that for Commissioning of the device a the fan (7). the heater (16) and the Transformer (38) influencing sequence control device (22) is arranged.

4. Apparatus according to claim 3, characterized in that that a starting fan (14) is arranged for drying the electrodes with warm air in the suction chamber (6), in whose Au: - laßleitung (18) the heating device (16) is installed, and that the outlet line (18) with a Non-return valve (20) can be closed.

5. Apparatus according to claim 3 or 4, there-

constant odor nuisance along the sewage network and difficulties in cleaning in the sewage treatment plant.

It is true that often in plants for wastewater disposal » pre-chlorination has been applied, however it is known that the use of chlorine poses permanent dangers to the safety of neighboring people Areas and for those individuals who handle the chlorine on a daily basis.

It is also bci.-jnnt (deutsche Zeitschrilt >> The gas and water locker. Issue 4.1% 1. P. 91, 92). one to discharge activated gas in the form of an ozone-air mixture into wastewater. This allows a Odor removal can be achieved, however, the toxic ozone in the wastewater is Microfiora destroys, which affects the subsequent biological cleaning. Also can because of Due to the toxicity of the ozone, the sewers and other systems are not used.

The object of the invention is to treat wastewater in such a way that that without damaging the bacteria causing the biological degradation process by the Wastewater caused smell: disturbances are avoided and at the same time the cleaning process of the Wastewater is introduced during the inflow to the sewage treatment plant. This task is solved in a method for treating wastewater by introducing a gas-air mixture into Abwasitunuen in that the gas-air mixture from

35

40

characterized in that the plate-shaped 45 is formed by a silent electrical discharge !.

Electrodes (44, 45) through intermediate insulating plates (48) and insulating spacers (46) are separated from each other.

6. Apparatus according to claim 5, characterized in that the electrodes (44, 45) are perpendicular are arranged.

7. Apparatus according to claim ö. Characterized in that that the electrodes (44, 45), the insulating plates (48) and the spacers through Insulating strips (49) are connected to form a stack.

8. Device according to one of claims 6 and 7 characterized in that the electrodes (44, 45) consist of aluminum expanded metal or of coarsely woven aluminum wool.

The invention relates to a method for treating waste water.

With the sewage treatment carried out today Ozone largely freed mixture consists of air and nitrogen oxides.

Atmospheric air is preferably filtered by silent electrical discharge before it is ionized and heated.

The invention also comprises an apparatus for carrying out the method. It is assumed of a device with a housing, with an air filter, with arranged in the housing, plate-shaped electrodes and with means for conveying the air through the housing. One such device is known for the generation of a gaseous mixture from atmospheric Air and gaseous nitrogen oxides, largely free of ozone (British patent specification 257 694). One such device is characterized according to the invention in that the housing is inserted into a suction chamber with a filter and a fan, in one connected to the suction chamber Ionization chamber with a device for generating silent electrical discharge, which is made of aluminum Contains electrodes, and is divided into an outlet chamber for depletion of ozone. that to

(/ \ 658

Supply of the electrodes with high-voltage current from a transformer and for temporary heating "Hin" the sucked air a heating device is provided and that for putting the device into operation a follower control device influencing the fan, the heating device and the transformer is arranged.

Further refinements of the invention are the subject of claims 4 to 8.
¹⁷ Since the introduction of the gas mixture causes the biological degradation of the wastewater constituents to begin at the end of the flow to the sewage treatment plant, the invention has the advantage that biologically purified water reaches the sewage treatment plant, so that larger wastewater 15 shows that quantities can be handled. Furthermore, the treatment with the above-mentioned activated gas has a beneficial effect on both the aerobic and the anaerobic degradation of the water constituents in the sewage treatment plant itself. VYe 1 -icwird the formation of sludge and slime md · η sewers prevented and the fat content '~ \ where the treatment plant reach sewage betiachtlich reduced. This will total the biochemical

the mixture contains at most small traces of ozone.

It is presumed that the unexpected properties of the gases generated is a result of the prevention of rust and slime formation the hygroscopic properties of the water-free mixture the slickstoftoxyde is. what moisture pull out of the surrounding atmosphere, so to speak, and thereby the formation of sludge, Prevent slime and rust on the walls of sewers and other treatment facilities.

The increased biological degradation during the flow time of the wastewater to the sewage treatment plant is evident n. that when feeding fixed

Nitrogen to wastewater by absorption and dissolution of g.i-shaped Svhire anhydrides and nebulae the necessary nutrients are supplied to the wastewater and a gee; iete environment for the Microbes that are trained to break down or the opening up! of wastewater are responsible. The reduction in smell nuisance is based probably because the nitrogen oxides produced in .Abwasser existing sulfides either as a gas

-mgert. Uadurcn weroen hisuls.miu u ... ■■■,, _{/ u}

and chemical oxygen demand des, 5 "derm VV . c <un, / u

-TUlI IVJt v.

relatively odorless

JtI IU '· ι -.

η oxidize compounds.

The drawing shows an embodiment of the device for performing the method according to FIG the invention. It shows

F i g. 1 shows a schematic longitudinal section. F i g. 2 shows the cross section along line 2-2 of F i g. 1 and

iciinwiji.v.11 r,., u, ... F i g. 3 is a circuit diagram of the device.

. Corrosion and destruction of paint and concrete. The device has a housing 4, which

in sewer pipes and in with sewer pipes 35 one after the other a suction chamber 6. an entry connector his buildings are prevented. In this case, chamber 10 can have a discharge chamber 46 with a with the relatively small, compact front-end device 26 for generating silent electrical discharge

direction according to the invention extraordinarily large '° - ^{nth; il1} from this

Volume of the nitrogen oxide-air genius is generated and Ab are continuously added.

Wastewater reduced. It is also achieved that solids in the wastewater reaching the sewage treatment plant can increasingly settle. The ability of the gas mixture to produce harmful substances is also of importance Eliminate odors, especially the formation of sulphides and methane in sewer pipes significantly reduce.

Finally it is achieved that the rusting of metal. Corrosion and destruction of paint and concrete

' ^: - -: · λ K, .... ic, .rli'iiimiipn gen and an outlet chamber 28 contains. From this'

Volume aes cnicKUAyu-Lun- ^ v., .., ", ..., _. _o . . is the air-gas mixture in the sewage system

are continuously added to the wastewater. 40 submitted.

The exact composition of the in the decay- In the suction chamber 6 is a

Ren gases used according to the invention can ' ^r - ^ n ...

cannot be determined exactly. In any case i'-but by the silent electrical discharge, which the air is subjected, the nitrogen molecules broken open and the nitrogen atoms connect dt'.nn with the simultaneously existing oxygen atoms, whereby the nitrogen in different

complex oxides of nitrogen, including NO, volume diameter scm. «Tt,. * .., _r ...

NO., N., Oj, Ν., Ο., And N., O., Fixicit is. The gases 50 has an output of about 14 m ^{: i} per minute. The filter 8 shows a negative reaction in the well-known so-called loosely compressed glass Ortholidin test for ozone, as this may contain wool to prevent dirt or other coarse particles or the nitrogen oxides generated. ,,never

to form complex compounds, many of which are unstable and have not yet been analyzed. It is known that at a concentration of ozone and nitrogen oxide of 100 parts per million parts these according to the equation , ^ : ";"",,,πΙλο; π 7ηη a

In the suction chamber »ι ..n t ... - an induction motor driven fan 2 is arranged, which air from the atmosphere through a filter 8 therethrough Sucks into the suction chamber 6 and out of the delivery pipe 12 of the fan 2 into the inlet chamber 10 is pressed.

The fan 2 can be any

duktionsmoior driven blower of large

Be volume throughput, which for example a

. , _ · Ι; "» ./ !; ","" _h ," _Dcr Filters

55 wanted to contain dirt or other coarser contaminants from the entering the device To remove air.

Before each starting process of the fan 2, a starting fan 14 driven by an induction motor is energized, which includes a heating device 16 in its outlet line. The power of this starting fan 14 can be the power of the fan • - _.! ", N"; _nor .,] <; (ij be _csc . If both-

100 parts per million parts this

NO -i O ₃ - * NOjO., React, with ozone being a starting blower I ^ sunn uu ^. _o -

Has a disintegration half-time of about 0.01 ½ seconds. Since they are equal to or less than 60. If at- (NO) If there is an excess, the fan 2 has an output of 14 nv 'each

d Litg of the start blower

ZerfallhalDzeii von eiwa. ,,>, ... ^ ...

If slick oxide (NO) is initially in excess, the generated ozone is rapidly consumed prior to the discharge of the gas mixture from the discharge chamber of the device. This theory is supported by the odor '. ·. of the gas produced, which is sweet and pungent and resembles the unmistakable odor of ozone, but of. this is distinguishable. Eir.e analysis of the C: ^ v 'cip.t an that

correspond to ouei Mtmt. .....

Spielswcise the fan 2 has an output of 14 m ^:) per minute, the output of the starting fan can be in the order of magnitude of 0.85 m ^{: 1} per N'inutc. The air heated by the heating device 16 is released through a non-return valve 20 into the entry chamber 10 and then between the electrodes 44, 45 of the device 26 for generating silent electrical charges. The purpose of

658 077

Lintriltskammer 10 ordered in it, a back line from iinerhil / ter (Hler heated l.ufl. clic through the Device durchgednicki is to prevent.

The starting fan 14 is switched on for a predetermined amount of time and / was by means of a sequential control device 22. which is connected by conductors 54, 56 to a suitable power source (not shown) and can be switched over by means of a switch 24.

After the rear wheels 44, 45 by the from Starting fan 14 incoming heated air are cleaned and dried, the starting fan 14 and hear the heater 16 to work. At about the same time as the end of this work process a transformer 38 is switched on, which supplies the device 26 with current. After commissioning of the device 26, the fan 2 pushes atmospheric air through the device 26 '. The device 26 is during a predetermined period of time before the fan 2 is started, so that Tempcraturändcrungcn the air supplied do not damage the insulation.

The air-gas mixture generated in the device 26 is discharged into the outlet chamber 28, from which it is pushed through an outlet tube 30 to the application site.

The device 26 works on the principle of silent electrical discharge, according to which the supplied Air exposed to an electrical discharge and thereby activated into a nitrogen oxide containing Gas mixture is converted. Partition walls 32 and 34 form supports for a platform 36 on which the device 26 is arranged. The dividing walls 32 and 34, the platform 36 and the top wall (ies Housing 4 thus form a discharge chamber 46 in which the device 26 is arranged. To this Thus, all of the gases pressed from the inlet chamber 10 to the outlet chamber 28 must pass through the device 26 go through. The partition walls 32 and 34, the platform 36 and the bottom of the housing 4 form a substantially closed chamber in which the high voltage generating transformer 38 is arranged. The transformer 38 generates at its secondary connections 40 and 42 a voltage of the order of 15,000 volts. the so to the electrodes 44. 45 of the Device 26 is applied so that adjacent electrodes have opposite charge.

The device 26 has. as can be seen from the cross-sectional view according to FIG. 2 can be seen isl. the shape of a Grid packing containing a plurality of non-ferrous metal electrodes 44 and 45, insulating plates 48 and insulating spacers 47 has. This grid packing is surrounded by means of it Insulating strips 49 firmly:?. U tied together in a compact unit and mounted on platform 36.

As in Fig. 2 shown in detail, the electrodes 44 and 45 are perpendicular to each other stacked. The Isolierplaltcn 48 consist for example of high dielectric glass or other Insulating material. The spacers 47 are preferably made of the same dielectric Material like the insulating plates 48. The electrodes 44 and 45 are in each of the insulating plates 48 and the spacers 47 arranged spaces formed. The electrodes 44. 45 are insulated over Conductors 72 and 74 are connected to secondary terminals 40 and 42 of transformer 38, respectively.

The electrodes 44, 45 are made of coarsely woven aluminum wool or layers of aluminum Expanded metal produced, as such electrodes' against about corrosion from salty atmospheres! Are not susceptible to air. Furthermore, such are electro resistant to pitting as a result of electrical discharge. Electrodes 44 designed in this way. 4! create a large surface for clic electric! Discharge without the throughput of large amounts of air ίο through and around the electrodes hinder.

The outlet chamber 28 of the device are used to allow the immediate delivery of the gas generated to prevent mixture to cause the decomposition of any ozone generated. This outlet came mer 28 also forms a means for the relatively slow distribution of the activated gas ii the sewers.

A circuit diagram of the device is shown in FIG. 3 shown represents. As a sequential control device 22 can be used jcd <appropriate device, which there:

Fan 2. the device 26 and the starting fan 14 mi of the heating device 16 in succession in Bc drive sets. In the present example, the sequence is controlled by a timer 60, de Corresponding switches 68, 70, 92 are actuated via cams 62, 64, 90 seated on a camshaft 66, gc forms.

In operation, the conductors 54 and 56 are connected to the power source via the switch 24 with the Timer 60 connected. The timer 60 actuates the cam 62 and bc via the camshaft 66 acts that the switch 68 the start blower 14 line the heater 16 energizes. The starting fan U pushes the heated air from the atmosphere through the device 26. to clean and dry it, as it is the most effective surface for electrical ent charge is created.

If after an appropriately chosen time ciei

4 ^ü drying process has ended, the switch 6f is opened by the cam 62 approximately simultaneously with the closer of the switch 92 by the cam 90. De:

Transformer 38 is energized and now supplies high voltage to the electrodes 44 and 45. After energizing the transformer 38, the fan 1 is switched on, which by closing the switch; 70 is carried out by the cam 64.

Instead of the generation of heated drying air shown here by using the starting area 14 and its heater 16, a heater that is compatible with the Fan 2 works together to make the air conveyed by the fan 2 for the desired purpose to heat. However, the separate drying apparatus shown in FIG. 1 preferred as the electro Drying with the hot air only when starting up or resuming operation after the work process has been interrupted by a power failure or for any other reason is, is necessary.

Are for use with either a single or multiple devices at the necessary locations along the sewer pipes in relatively great distance from the water treatment plant einge- ⁶ S builds. The number of devices required depends on the requirements of the existing wastewater treatment plants.

During a practical test of the process

658 077

wind two Voriichlungs according to the invention connected to a sewer sanitary line, which was intended for I 5 HOO people. The one before The seal was connected to the sewer pipe to a! i'twa .xii km away from the sewage treatment plant SilIIi 'connected while the other device with the same Absvassei line at eitiei for example (, 2 km away from the sewage treatment plant. Observations were made daily accomplished. After 15 days, the following results were obtained receive:

1. Reduction of the total raw sludge, which the wastewater treatment plant reached 48.0 "n

2. The sewer line and sewage were completely odorless

χ Reduction of the fat content of the

Sewage 66.0 " »

4. Reduction of the need for biochemical oxygen 48.0 °. υ

.X Corrosion and rust formation were avoided

6. All of the slime or silt was from the walls of the sewer eliminated from the point of installation to the treatment facility

In addition, comparisons were made with raw sewage carried out, the wastewater either a treatment with air or with the Gas-air mixture according to the invention was subjected.

The results showed an overall increase in wastewater treated with air only ■ lerobic dehydration activity and increased oxidation of organic metabolites by the microflora of the waste water treated with the gas according to the invention. The results indicate. that the Microflora of the wastewater treated with the gas-air mixture according to the invention is in their • Xr. / Ahl treated with air in relation to the flora Abu, wise had enlarged and continues to have theirs i uh '.;'. kiii / i had taken, physiological breathing from / ulühieii or the < > \ yiiation of organic metabola aiii reason in the increased aerobic activity of dehydration / u cause. This is the result in addition that clic Nhkioflora des with the I.uft-nitrogen oxide mixture treated raw wastewater, the organic and inorganic substances in the wastewater

jo can catabolize better than the flora of the air-treated wastewater is capable of.

Further studies were carried out to determine the effect of gas-air mixing according to the Invention to determine the ability of the microflora of the bed traded wastewater from proteinaceous Material to form hydrogen sulfide anaerobically, which is a measure of the ability of the microflora to to decompose organic substances anaerobically.

The investigations showed that the loading

to treat raw wastewater with the gas-air mixture according to the invention, the ability of the microflora of the wastewater is increased to anaerobically cr-

* 5 witness. This indicates. that by the procedure after of the invention, the number and / or the enzymatic ^ activity of the protein or its cleavage products acting microflora is progressively increased with the duration of treatment. It can it can be concluded that by the method according to the invention the formation of a microflora is made possible, which is better able to the anaerobic degradation of organic sulfur Bring material into sewage.

In contrast, when the wastewater was aerated, there was no noticeable increase in the number of Living organisms and / or the enzymatic activity of that part of the microflora that is capable. Proteins or protein breakdown products to anaerobically

■ to convert sulfuric hydrogen gas.

1 sheet of drawings

Claims (2)

Patent claims: 1. Process for treating wastewater by introducing a gas-air mixture into wastewater pipes, characterized, that the gas-air mixture is formed by a silent electrical discharge of Ozone largely freed mixture consists of air and nitrogen oxides. 2. The method according to claim 1, characterized in that atmospheric air before their Ionization is filtered and heated by silent electrical discharge. tigun «, the wastewater from households and industry is collected and in branched sewer pipes led via main lines to a sewage treatment plant. After cleaning ^ the wastewater is drained into rivers, Streams and harbors and is theoretically part of the reusable water supply. The more and more branched, more complicated and longer lines have meanwhile closed raised serious problems of odor removal and sewage purification. for the reason that the organic .: material in the wastewater begins to decompose before it does due to the aerobic treatment that is common today