DE19647512A1 - Mobile waste water treatment assembly - Google Patents

Abstract

A mobile waste water treatment assembly receives untreated water (LA) through an inlet (1) and discharges treated water through an outlet. The waste water (LA) passes in series through coarse filtration stage (AS1), flotation stage (AS2), biological treatment stage (AS3) and final post-clarification stage (AS4). The novelty is that an upper receiving-chamber (K1), flotation chamber (K2), post-treatment chamber (K3) and sludge collector (18) are all arranged within a compact housing (KG). The receiving-chamber (K1) has a coarse separator (2) forming the coarse filtration stage (AS1). The flotation chamber (K2) and associated gas inlets (9,5) generate the bubbles which form the flotation stage (AS2). The post-treatment chamber (K3) stage (AS4) consists of an aerobic loop reactor (11), the biological treatment stage (AS3) and a micro-filter (15). The post-treatment chamber (K3) has base-level air inlets (13). The sludge holder (18) acts as an intermediate holding unit (18) for sieve residues (S1) from the coarse separator (2), for floating residues (S2) from the flotation chamber (K2) and excess sludge from the post-treatment chamber (K3).

Description

The invention relates to a mobile clarifier with a upstream sewage supply line and an outflow side Clear water discharge, in the wastewater in several Preparation stages is cleaned, for which purpose in Processing direction a coarse material separation stage, at least one flotation level and one biological Clarification stage and a secondary clarification stage arranged one after the other are.

Generally, there are different embodiments of mobile Clarifiers of the type mentioned are known. In the European patent application EP 0 165 883 A1 is one described mobile wastewater treatment plant, which on a Chassis is mounted and in the direction of water treatment a filter device, a flocculation device and two Has flotation tanks connected in series. Farther is a centrifuge on the output side for sludge dewatering arranged. The wastewater supplied on the inlet side is the first pre-clarified in the filter device in which solids are larger separated as 500 microns. Then in the Flocculation device by adding flocculants flocculent component separated from the wastewater to make it one To supply flotation. In the flotation basin with air enriched water supplied relaxing so that the Floating components from the ascending microbubbles Flush wastewater and thus from the liquid phase remove. In addition to a first chassis on which the actual wastewater treatment plant is installed, a  second chassis for transporting the electrical Utilities needed. Because of their great Such a wastewater treatment plant is required for space not suitable for a frequent change of location. Farther the use of flocculants causes a disadvantage Increasing the amount of sludge, so that a drainage device, like a centrifuge, is needed to get the Subsequent minimization of sludge by dehydration.

The object of the invention is a clarifying device at the outset mentioned type with regard to the space requirement and its Improve efficiency.

According to the invention, this object is achieved through the features of Claim 1 solved.

The different are in a compact housing Processing stages arranged one behind the other. There as Compact housing preferably a container with a Standard size, the clarifier can be simple and inexpensive on available means of transport, like railroad or truck, transported back and forth will. Furthermore, the problem-free transport of the Clarification device due to the compact design a flexible Use of the system at different, locally different from each other independent locations. Of course that could Sewage treatment device can be mounted on its own chassis, if frequent changes of location are to be carried out.

By arranging the preparation stages in the Compact housing, especially one above one Flotation chamber and a post-processing chamber positioned Feed chamber, the wastewater to be treated is below Exploitation of gravity is encouraged, therefore Clarification device with few funds at a low Energy requirements can be operated at low operating costs.  

The space-saving arrangement of the Preparation levels enough space for everyone Utilities, in the form of a blower and a Compressor and a dispersing station and one Control device, present; even a sludge collector for is the buffer of the sludge generated in the process provided on the bottom in the compact housing.

Furthermore, it is an object of the invention to provide a clarifying device to reveal with which even with unstable Location conditions, such as on ships, a Wastewater treatment can be carried out continuously without the efficiency of the system is adversely affected.

This object is achieved by the features of Claim 3 solved.

A vertical alignment of the flotation chamber with one mixing room below, one above Flotation collector and a mixing room in between allows the separation of floatable solids from the Wastewater along the height of the flotation chamber Flotation chamber requires a minimal footprint.

In a particularly preferred embodiment of the Clarifiers are between sections of the Partition walls arranged as a flotation chamber on the top converging truncated cone with an opening-side collar educated. The is advantageously used to remove the flotate the partition separating the separating room and the flotate collector, which is an overflow system. The floating float is compressed via the cone and in via the overflow system removed the flotate collector.  

With such an overflow system is independent at all times from a water level in the separation room, one Flotate removal reliably guaranteed. Because the motor Driven flotate clearer for the surface clearing of Flotat is suitable for fluctuating liquid levels, the overflow system forms a simple but effective one Means to solve this problem.

The formation of the flotation chamber in the form according to the invention of a separation tower and the resulting vertical Operation of the flotation only along the Flotation chamber height form an independent one Invention ideas.

A clarifier with such a flotation chamber also works with changing or fluctuating Liquid levels in the flotate chamber, as a roller Flow in the deposition space advantageously because of their constructive design and thus a mixture of wastewater to be treated with already floated clear water is prevented.

It is suitable as a coarse material separator in the feed chamber especially a drum screen, the same preferably from is fed outside to the inside, so that the running water self-cleaning of the sieve drum causes. Depending on The screen drum has a gap of 0.5 mm up to 2.0 mm to coarser from the supplied wastewater Remove impurities.

Alternatively, can be used as a coarse material separator Filter stage calculator or for non-sticky soiling a curved screen can also be used.

According to the invention, the biological clarification stage has one Loop reactor with an inner loop. An effective one  Possibility of a downward facing in the inner loop Generating flow consists of entering the loop Agitator, preferably a motor-driven one Propeller to arrange. A bulge formation advantageously by sucking in air from above and / or baffles spaced below the agitator, such as Air supply, prevented.

Another way to drive the loop is through the targeted introduction of a suction-side intake pipe Circulation pump in the lower section of the loop and through Arrangement of a discharge-side delivery pipe of the pump adjacent in the upper chamber area of the post-processing chamber achieved. Conversely, there is also the possibility of Arrangement of the suction pipe in the post-processing chamber and the Pump delivery tube in the upper section of the inner loop.

A clarification of the clear run in the clarification stage is advantageously by means of one in the post-processing chamber provided microfilter. With one particularly favorable embodiment of the invention The filter plates become backwashable operated, d. H. via a valve system with preferably two A filter pack is regenerated while pumping with the other filter pack water ingredients a size of Bacteria are filtered out.

The design features set out in the subclaims represent further embodiments of the task solution.

In summary it can be said that with the mobile clarification device according to the invention to the Preparation of site and operating conditions adapted Sewage to clean clear water easily and inexpensively is feasible.  

The clarifying device is characterized by a small Space requirements and diverse integration options in existing sewage treatment systems and production facilities. Because of the clarification device can also be used in the structural design unstable location conditions, for example on ships, be used. Due to the compact design and the arrangement The processing stages to each other can be the number of pumps minimized compared to known wastewater treatment systems be what is positive about the power needs of the Overall system affects.

The invention is illustrated in the figures preferred embodiments explained. It shows:

Fig. 1 is a side view of a skid case a clarifier stage with a coarse material deposition, a flotation step, a biological clarification stage and a secondary clarification,

Fig. 2 is a procedural flow diagram of the clarifier shown in FIG. 1,

Fig. 3 shows a detailed view of the flotation stage in the clarifier. Fig. 1

Fig. 4a shows a first embodiment of a biological clarification stage in the clarifier,

FIG. 4b shows a second embodiment of a biological clarification stage in the clarifier,

Fig. 4c, a third embodiment of the biological clarification stage in the clarifier.

The clarification device for wastewater treatment and purification according to the invention is installed in a compact housing KG, a coarse material separation stage AS1, a flotation stage AS2, a biological clarification stage AS3 and a secondary clarification stage AS4 being arranged one behind the other in the treatment direction. The compact housing KG consists of a container KG with standard dimensions. Exhaust air GA generated in the preparation stages AS1, AS2, AS3, AS4 is discharged via exhaust air connector 17 . Otherwise the compact housing KG is hermetically sealed.

In the compact housing KG, a feed chamber K1 is arranged above a flotation chamber K2 and a post-processing chamber K3 as well as a sludge collector 18 . In the feed chamber K1 arranged at the top, an inflow-side waste water feed line 1 ends, which connects the clarification device to the existing waste water system, for example a production plant. A drum screen 2 is arranged in the feed chamber K1. Bottom side, the object of the chamber K1 is a screen drum 2 associated Siebrückstandsabführung 3 in the form of a gravitational slide 3 and below the drum screen 2, a waste water outlet 4 on. With the sieve residue discharge 3 , coarse material S1 separated by the drum sieve 2 is disposed of in the sludge collector 18 .

The waste water discharge line 4 connects the coarse separation stage AS1 to the flotation stage AS2. The flotation stage AS2 is formed by the flotation chamber K2 with a mixing space K21, a separation space K22 and a flotate collector K23 arranged vertically one above the other and by a gas introduction device 9 connected to the flotation chamber (see FIG. 3).

The mixing chamber K21, the separating chamber K22 and the flotate collector K23 are separated from one another by upwardly converging partition walls 6 , 7 in the form of a truncated cone with an opening-side collar, the partition wall 7 between the separating chamber K22 and the flotate collector K23 forming an overflow system ÜS. A dispersing station lead 10 R with integrated expansion valve 5 leads into the mixing room K21, the dispersing station lead 10 R being formed within the mixing room K21 as a vertically arranged tube which ends in the opening area of the mixing room K21. The waste water discharge 4 from the feed chamber K1 ends on the bottom side in the mixing room K21.

The separating chamber K22 has clear-end discharge lines 10 A, 10 on the bottom, one clear-discharge line 10 A to the dispersing station 9 and the other clear-line discharge line 10 connecting the flotation stage AS2 to the biological clarification stage AS3 and secondary clarification stage AS4 arranged in the post-processing chamber K3.

The flotate collector K23 has a flotate discharge 8 on the side, which is assigned to the partition 7 in such a way that the flotate slips along the truncated cone and is discharged into the flotate collector 18 without any funding. An aerobic loop reactor 11 for forming the biological clarification stage AS3 and a microfilter 15 for forming the secondary clarification stage AS4 are fixed in the post-processing chamber K3 adjoining the flotation chamber K2. Ventilation systems 13 on the bottom serve to supply oxygen during the preparation process. Membrane aerators 13 in the form of mushrooms or tubes are particularly suitable.

The bottom of the post-processing chamber K3 is formed below the loop reactor 11 as a depression 30 which serves as excess sludge collector and is connected to the sludge collector 18 via a connected excess sludge discharge 14 . On the output side, the microfilter 15 is arranged in the post-processing chamber K3, the lines 16 A, 16 R connected to it functioning as clear water drain 16 A or as backwash line 16 R. On the downstream side, the clarification device has a clear water outlet 16 , via which the cleaned wastewater is discharged into the environment as clear water LA or is returned to the production process.

The sludge collector 18 has a closable sludge discharge port 19, over which the cached in the sludge collector 18 S sludge is removed from the clarifier. In addition to a control device accommodated in a control cabinet 31 , further supply devices, such as pumps 22 , 23 , a blower 20 and a compressor 21 , which are required to maintain operation, are integrated in the compact housing KG.

For maintenance purposes are on the compact housing KG Maintenance flaps fixed movably.

The preparation process is explained below using the process flow diagram shown in FIG. 2. The wastewater LZ to be treated is introduced via the wastewater feed line 1 into the coarse material separation stage AS1 with the drum screen 2 arranged in the feed chamber K1. Here, the drum screen 2 is charged from the outside in, so that the pre-clarified waste water L1 flowing down through the screen drum causes a self-cleaning effect of the screen drum. Depending on the type of waste water, a separate spray device is provided in the feed chamber K1. The screen residue S1 is fed to the sludge collector 18 via the screen residue discharge 3 with an odor trap for temporary storage. The pre-clarified wastewater L1 reaches the mixing chamber K21 of the flotation chamber K2 via the wastewater discharge line 4 and is mixed there with a recycling stream LG with microbubbles from the dispersion station 9 . To provide the recycling stream LG, a partial stream of the clear run L2 is removed via the dispersing station supply line 10 A from the separating room K22 of the flotation chamber K2 and fed to a separate dispersing station 9 , where it is enriched under pressure with gas G, in particular oxygen, and then in one of the dispersing stations 9 downstream expansion element 5 in the dispersion station discharge line 10 R, so that part of the gas G dissolved in the liquid is released in the form of microbubbles.

The compressor 21 connected to the dispersing station 9 serves to generate the excess pressure prevailing in the dispersing station. A recycling pump 23 is integrated into the recycling circuit as a conveyor.

By mixing the wastewater stream L1 with the recycling stream LG in the mixing room K21, particulate floatable water constituents up to a size of 1.0 mm are conveyed through the microbubbles to the liquid surface in the separating room K22. In the separating chamber K22 of the flotation chamber K2, the floating flotate S2 is compressed via a cone 7 and fed to the sludge collector 18 via an overflow system US with a flotate discharge 8 . For further treatment, the pre-clarified, floated wastewater L2 is removed via the clear line 10 from the separating room K22 of the flotation stage AS2 and fed to the post-processing chamber K3 with the biological clarification stage AS3 and the secondary clarification stage AS4. The pre-flotation and the associated reduction in the particulate water content relieves the biological clarification stage AS3, whereby the proportion of working biomass in the Ts content is increased. The loop reactor 11 works with an inner loop 111 , which can be operated in two ways depending on the application (see FIGS. 4a to 4c). The biological clarification stage AS3 is aerated by ventilation systems 13 installed at the bottom. A further air supply takes place via air supply lines 12 directly into the loop 111 .

The overflow sludge S3 is temporarily discharged into the sludge collector 18 via a sink 30 in the post-processing chamber K3 via a controlled solenoid valve. The required air G, in particular the oxygen, is made available via a blower 20 which is connected to the ventilation system 13 and the air connections 12 .

The clarification of the bacterially treated wastewater is carried out by a microfilter system 15 in the clarification stage AS4. The filter plates are operated backwash, ie a filter package is always backwashed via a filter system with two pumps 22 , while the other filters the water constituents, namely the biomass down to bacterial size. The clear water L4 is removed from the post-processing chamber K3 via the microfilter 15 via the clear water discharge line 16 A by means of a first pump 22 before it is at least partially released into the environment as clear water LA. Another partial flow of the clear water L4 is fed back into the microfilter 15 via a second pump 22 arranged in the backwash line 16 R for the regeneration of the filter packs.

The sludge collector 18 is an intermediate storage 18 for the sieve residue S1 from the coarse material separator 2 , for the flotate S2 from the flotation chamber K2 and for the excess sludge S3 from the post-processing chamber K3. From time to time the temporarily stored sludge S is discharged via the discharge connection 19 . In the sludge collector 18 , conditioning and compaction can optionally be carried out using a screw press, but this method must be tailored to the application in individual cases.

The flotation stage AS2 is shown in detail in FIG. 3. The dispersion station 9 is connected to the flotation chamber K2 via the dispersion station feed line 10 A and the dispersion station feed line 10 R with an integrated expansion element 5 .

The flotation chamber K2 essentially consists of the mixing space K21, the separating space K22 and the flotation collector K23, the various chambers K21, K22, K23 being arranged horizontally one above the other. The wastewater pre-clarified in the coarse material separation stage AS1 is introduced into the mixing room K21 on the bottom side and treated to float over the height of the separation room K22, for which purpose the pre-clarified wastewater L1 is mixed with a recycling stream LG from the dispersion station 9 in the mixing room K21. By driving the microbubbles, a flow with an upward preferred direction is formed in the separating space K22. A partition 6 arranged between the mixing space K21 and the separating space K22, which takes the form of an upwardly open truncated cone, supports the upward movement of the flow and divides the inlet area into the flotation chamber K2 from the outlet area from the flotation chamber K2. By pulling off the clear run K2 in the bottom area of the separating space K22, a roller flow is created.

The partition 7 arranged between the separating space K22 and the flotate collector K23 also has the shape of a truncated cone with an opening on the opening side. The partition 7 simultaneously forms a separating element 7 of an overflow system ÜS for removing the flotate S2 from the flotation chamber K2. The floating flotate S2 is compressed by the cone shape of the partition 7 . As the process progresses, the flotate carpet S2 continues to grow until it has reached the end collar of the overflow system ÜS, after which the flotate S2 slides along the inclined plane. Lateral drainage openings 73 in the lower section of the collar serve to drain the flotate S2. The flotate S2 is discharged into the flotate collector K23 and from there via the flotate discharge 8 into the sludge collector 18 .

In FIGS. 4a to 4c show various possibilities of the drive are shown a loop reactor with internal loop 111. 11

FIGS. 4a and 4b show a loop 111, which is driven by a pump 24. According to FIG. 4a, a suction-side suction pipe 241 of the pump 24 is arranged in the lower section of the inner loop 111 and a pressure-side discharge pipe 242 of the pump 24 is arranged in the upper chamber area of the post-processing chamber K3 to form the downward flow in the loop. The pump 24 constantly circulates water; due to the pressure difference between the pressure and suction side, the flow is formed and the clear run is conveyed into the loop reactor 11 . The clear run L2 introduced into the postprocessing chamber K3 is forcibly fed into the loop 111 on the top side by the developing suction of the downward flow prevailing in the loop reactor 11 . In loop 111 , the clear run L2 is biodegraded by means of microbiology. The biodegraded water emerges on the underside of the loop 111 . The post-processing chamber K3 has an outlet connection 17 on the top, through which exhaust air GA is discharged.

In FIG. 4b, the suction-side suction pipe 241 of the pump 24 is arranged in the post-processing chamber K3 and a discharge-side discharge pipe 242 of the pump is arranged in the upper section of the loop 111 to form the downward flow in the loop 111 .

In Fig. 4c a possibility of driving of the loop 111 by means of an agitator 25, preferably of a propeller agitator 25 is illustrated. The motor-driven propeller 251 causes a downward flow to form in the loop. Baffles installed in front of and behind the propeller prevent the formation of drums by sucking in air. For this purpose, lateral air supply lines 112 are provided in the inner loop. Depending on the area of application, the agitator 25 can also be operated in a speed-controlled manner.

Claims (14)

1. Mobile clarifier with an upstream waste water supply line ( 1 ) and a downstream clear water discharge line ( 16 ) in which waste water (LA) is cleaned in several treatment stages (AS1, AS2, AS3, AS4), for which purpose a coarse material Separation stage (AS1), at least one flotation stage (AS2) and a biological clarification stage (AS3) and a secondary clarification stage (AS4) are arranged in series, characterized in that
in a compact housing (KG), an overhead feed chamber (K1), a flotation chamber (K2), a post-processing chamber (K3) and a sludge collector ( 18 ) are arranged,
and the feed chamber (K1) has a coarse material separator ( 2 ) forming the coarse material separation stage (AS1),
and that the flotation chamber (K2) and a connected gas introduction device ( 9 , 5 ) for bubble generation form the flotation stage (AS2),
and that in the post-processing chamber (K3) an aerobic loop reactor ( 11 ) forms the biological clarification stage (AS3) and a microfilter ( 15 ) the post-clarification stage (AS4),
and that the post-processing chamber (K3) has bottom-side ventilation systems ( 13 ) for an oxygen supply
and that the sludge collector ( 18 ) is an intermediate storage ( 18 ) for sieve residue (S1) from the coarse material separator ( 2 ), for flotate (S2) from the flotation chamber (K2) and for excess sludge (S3) from the post-processing chamber (K3) . 2. Clarifier according to claim 1, characterized in that the same is installed in a container (KG) with a standard size as a compact housing (KG) hermetically sealed and in the processing stages (AS1, AS2, AS3, AS4) resulting exhaust air (GA) over at least an exhaust port ( 17 ) is discharged. 3. Clarification device according to one of claims 1 or 2, characterized in that in the flotation chamber (K2) a mixing chamber (K21) arranged at the bottom, a flotate collector (K23) arranged at the top and a separating space (K22) arranged in between each through an opening (Ö1 , Ö2) containing partition walls ( 6 , 7 ) are separated from each other, with a pre-clarified waste water (L1) from the coarse material separation stage (AS1) on the underside of the mixing room (K21) and a recycling stream (LG) mixed with microbubbles on the dispersion station ( 9 ) are fed, and from the separating chamber (K22) the flotate (S2) is discharged on top through the opening (Ö2) to the flotate collector (K23), from where it is discharged to the sludge collector ( 18 ), as well as the floated waste water (L2 ) on the underside for further processing in the post-processing chamber (K3) and for gas enrichment in the dispersion station ( 9 ). 4. Clarifier according to claim 3, characterized in that the partitions ( 6 , 7 ) are formed by an upwardly converging truncated cone ( 6 , 7 ) and an opening-side collar. 5. Clarification device according to one or more of claims 1 to 4, characterized in that an overflow system (ÜS) with separating elements ( 7 ) in the flotation chamber (K2) for removing the flotate (S2) from the separating space (K22) in the flotate collector ( K23) is used. 6. Clarifier according to claim 4 and 5, characterized in that the mixing chamber (K22) and the flotate collector (K23) separating partition ( 7 ) forms the separating member ( 7 ) of the overflow system (ÜS). 7. clarifying device according to one or more of claims 1 to 6, characterized in that the coarse material separator ( 2 ) is a drum screen, a filter stage rake or a curved screen. 8. Clarifier according to one or more of claims 1 to 7, characterized in that a downward flow is generated within a loop ( 111 ) of the loop reactor ( 11 ) by a pump ( 24 ). 9. Clarification device according to claim 8, characterized in that to form the downward flow in the loop ( 111 ) a suction-side suction pipe ( 241 ) of the pump ( 24 ) in the lower section of the loop ( 111 ) and a pressure-side discharge pipe ( 242 ) of the pump ( 24 ) are arranged in the upper chamber area of the post-processing chamber (K3). 10. Clarifier according to claim 8, characterized in that to form the downward flow in the loop ( 111 ) a suction-side suction pipe ( 241 ) of the pump ( 24 ) in the post-processing chamber (K3) and a pressure-side discharge pipe ( 242 ) of the pump ( 24 ) in the upper section of the loop ( 111 ). 11. Clarifier according to one or more of claims 1 to 7, characterized in that a downward flow is generated within a loop ( 111 ) of the loop reactor ( 11 ) by an agitator ( 25 ), preferably a propeller ( 25 ). 12. Clarification device according to claim 11, characterized in that the loop ( 111 ) above and / or below to a stirring tool ( 251 ) arranged air feeds ( 112 ). 13. Clarifier according to one or more of claims 10 to 12, characterized in that the agitator ( 25 ) is driven by a speed-controlled motor. 14. Clarification device according to one or more of claims 1 to 13, characterized in that the microfilter ( 15 ) is formed by at least two filter packets, part of the filter packets operating in the filtration mode, and the other part being regenerated by backwashing.