WO1990011254A1

WO1990011254A1 - Device for purifying waste water

Info

Publication number: WO1990011254A1
Application number: PCT/EP1989/000327
Authority: WO
Inventors: Hans-Joachim Bassfeld; Stefan Pape
Original assignee: Envicon Luft- Und Wassertechnik Gmbh & Co. Kg
Priority date: 1989-03-28
Filing date: 1989-03-28
Publication date: 1990-10-04

Abstract

A device for purifying small quantities of waste water comprises devices for mechanical preliminary purification, preliminary clarification, biological and/or chemical purification, subsequent clarification and sludge treatment and is designed as a transportable container unit. To this end, a chamber container (1) is divided by intermediate walls (4, 5) into a plurality of chambers (6, 7, 8) which communicate in sequence with each other to permit the passage of waste water. The last chamber (8) is associated with an outlet (12) which controls the liquid level (13). To achieve an adaptable flow path, all adjacent chambers (6 to 8) are interconnected by closable openings (14). The flow path can be established and changed if necessary by opening or closing the openings.

Description

Wastewater treatment facility

The invention relates to a wastewater treatment device with devices for mechanical pre-treatment, pre-treatment, biological and / or chemical cleaning, post-treatment and sludge treatment.

Various methods are known for cleaning wastewater from households or commercial companies, depending on the type and degree of contamination, which proceed in several process stages. For example, the contaminated wastewater is first pre-cleaned mechanically from coarser dirt particles by means of a catch device and then in a pre-clarifier. This can be followed by biological wastewater treatment using the activated sludge or fixed bed body method in one or more pools. If necessary, chemical flocculants or the like are also added. The flocculated sludge settles in a clarifier before the cleaned water is fed to a receiving water. The sludge settled in the clarifier must then be stabilized, if necessary, disinfected and stacked. Wastewater treatment plants which operate according to this method and are usually built to be stationary have a large space requirement and are economically viable only from a certain amount of wastewater. On the other hand, however, the wastewater, which is produced in small quantities in remote areas, for example agricultural businesses, hotels, campsites or smaller settlements and cannot be supplied to a larger wastewater treatment plant, also requires cleaning. For this purpose, a smaller cleaning device with an aeration tank and a secondary clarifier in a factory-made compact construction has become known. whose use, however, requires additional facilities for pre-cleaning and sludge treatment. A breakdown of nitrogen compounds by biological nitrification is generally not possible with this device. Without sludge treatment, there would also be considerable odor nuisance. The known smaller wastewater treatment devices are also designed for a certain amount of wastewater and are unsuitable if this is subject to larger fluctuations.

In contrast, the invention is based on the object of compactly designing a wastewater treatment device of the generic type for small amounts of wastewater in such a way that it permits the entire process sequence from pre-cleaning to treatment of schiaroma and permits adaptation to the type of contamination and to fluctuating amounts of wastewater.

This object is achieved according to the invention in that a chamber container is divided by partition walls into a plurality of chambers which are communicatively connected to one another for a successive flow of waste water and in that a device which determines the liquid level is provided.

In the waste water purification device according to the invention, the chamber container can be set up for the cleaning method which is most favorable for the local waste water conditions, in that the chambers required for this are connected in a suitable manner in a communicating manner. This can be done in advance by arranging the communicating device on the workshop side, the waste water purification device being intended for an operating state from the outset. However, if a change in the wastewater conditions, in particular the wastewater quantity, is to be expected, as occurs seasonally in holiday settlements, hotels or the like, the wastewater treatment device can be adapted to the changed operating conditions. if, according to a further feature of the invention, all of the adjacent chambers are connected to one another by closable openings. If, for example, the activated sludge process is used, the biological treatment room can be reduced or enlarged. It is also possible to adapt the chamber used for the preliminary or subsequent clarification. A similar adjustment can also be achieved if the composition of the contamination changes and / or another cleaning method is more suitable. The liquid level can be determined, for example, by assigning a corresponding drain or overflow to the last chamber through which the waste water flows.

The closable openings can be designed in various ways. According to a particularly advantageous, robust design, edge elements are provided which can be detachably fastened on the upper edges of the intermediate walls lying in one plane for an optional determination of an overflow path for the waste water. In this embodiment, the flow path is defined by a corresponding arrangement of the edge elements on the upper edges of the partition walls. In another embodiment, the communicating openings are provided with a shut-off element, which are opened or remain closed to define the flow path. According to a further embodiment, the partitions are mounted so as to be vertically displaceable relative to the partitions adjacent at right angles to form an opening above the bottom of the chamber container. By lifting the partition concerned, an opening fluidically connects the adjacent chambers is created between the lower edge and the bottom of the chamber container.

The flow paths can be set particularly favorably if the chambers are arranged in three adjacent rows and the chambers of the two outer rows are channel-shaped and are provided with a screw conveyor. A particularly simple construction is created that the three chambers lying side by side transversely to the three rows are combined to form an assembly which can be assembled into a row in a modular manner with the same assemblies. The design with the same modules allows a factory adjustment to certain wastewater quantities by the number of modules.

The various biological cleaning processes can be used optionally, with ventilation devices and / or immersion bodies preferably being arranged in the chambers in the middle row. Chambers for chemical wastewater treatment can also be set up. In particular, the large number of chambers available permits nitrification of the wastewater and therefore can also be used in places where the wastewater has a high nitrogen content.

If the chamber container is arranged in a container, a very compact structure is provided, which facilitates the transport of the factory-made device even to remote places. The other facilities necessary for complete wastewater treatment and sludge treatment can also be accommodated in this container. Thus, a mechanical pre-cleaning device is arranged in the container, which is connected by a tube to an inlet chamber to which a lateral chamber located at an end face of the chamber container is connected by means of an overflow wall. For the outflow of the purified water, it is provided that the last side chamber serving for the secondary clarification in the direction of flow is connected to an outflow chamber connected to a receiving water. For the sludge removal from the pre- and post-clarification chambers, the screw conveyors of the side chambers are connected via a pipe to a sludge treatment container arranged in the container, into which the sludge is aerobo-thermally treated and stabilized. A stabilized sludge is used to store the stabilized sludge. ter connected to the sludge treatment tank. The stacking container is expediently arranged to the side of the chamber container.

The invention is shown in the drawing, for example; it shows

1 shows a chamber container with communicating openings in the intermediate walls in a perspective view,

2 an intermediate wall in the area of an opening with a shut-off element in a cross section,

3 shows a chamber container with vertically displaceable partition walls in a schematic representation,

4 shows a connecting post for vertically displaceable partition walls in a horizontal cross section,

5 a chamber container in a modified version in a perspective view,

6 shows a top view of a wastewater treatment device arranged in a container,

Fig. 7 shows the subject of Fig. 6 in a cross section.

The chamber container 1 shown in FIG. 1 is constructed, for example, from welded steel sheets. It has a rectangular plan and has two side walls 2 and two end walls 3. It is divided into a plurality of chambers 6 to 8 by longitudinal and transverse intermediate walls 4, 5. In the embodiment according to FIG. 1, twelve chambers 6 to 8 are provided, which are arranged in three adjacent rows, of which the chambers 6 and 8 located on the two sides serve for preliminary and / or subsequent clarification, while the middle row with the chambers 7 is available for biological and / or chemical cleaning. The three chambers 6, 7, 8 lying side by side transversely to the three rows are each combined into assemblies 9. Overall, four assemblies 9 are provided in the embodiment according to FIG. 1, which are assembled in a modular manner in a row to form the chamber container 1. The two outer rows with the chambers 6 and 8 are channel-shaped and each provided with a screw conveyor 10 which runs parallel to the side walls 2.

In the embodiment according to FIG. 1, an inlet pipe 11 is provided on an end wall 3, which feeds the wastewater into the first side chamber 6, which serves for preliminary clarification. On the other end wall 3, a drain pipe 12 is provided, the inlet end of which is arranged vertically in the last chamber 8 used for the clarification, so that the height of the drain opening determines the height of the liquid level 13, all chambers 6 to 8 are successively through openings 14 communicating with each other, so that the liquid level 13 is the same in all chambers 6 to 8 and the waste water from the inlet flows through all the chambers 6 to 8 to the outlet one after the other. The openings can be arranged in the intermediate walls 4, 5 in accordance with the intended flow path. The flow path can initially flow, for example, through all lateral chambers 6 (from rear to front in FIG. 1), one or more openings 14 being provided in the transverse partition walls 5 separating these chambers 6. The front chamber 6 is through an opening 14 in the longitudinal partition 4 with. the adjacent middle chamber 7 connected. Through openings 14 in the transverse partition walls 5, the waste water flows through all the middle chambers 7 (in FIG. 1 from front to back). The last middle chamber 7 is connected to the adjacent side chamber 8 through an opening 14 in the longitudinal partition 4, and flows through openings 14 in the transverse partition 5 the waste water through all lateral chambers 8 to the last chamber 8, in which the drain pipe 12 is located. For the sake of clarity, only the openings between the front lateral chamber 6 and the front middle chamber 7 and between the latter and the following middle chamber 7 are shown in FIG. 1.

The flow path for the waste water through the chambers 6 to 8 depends on the nature of the waste water. While the side chambers 6 are useful for preliminary clarification and the side chambers 8 for clarification, z. B. ventilation devices for forming activated sludge chambers and / or immersion bodies can be arranged in order to be able to use a cleaning method suitable for the waste water. By arranging the openings in the intermediate walls 4, 5 accordingly, the wastewater can also flow through the chambers 6 to 7 in another sequence. So there is z. B. the possibility of first flowing through the rear chambers 6, 7, 8 from left to right, then the chambers 8, 7, 6, etc. in front of them, so that a meandering flow path is created.

The flow path of the wastewater from chamber to chamber can be predetermined by appropriately arranged openings 14. However, it is also possible to connect all adjacent chambers 6 to 8 to one another by closable openings 14 which are opened in accordance with a selected flow path. This design allows the flow path to be adapted and subsequently changed to the local operating conditions. For example, the openings 14 can be closed by a shut-off device 15. The shut-off device 15 shown in FIG. B. a slide which is slidably mounted in guide rails 16. Valve flaps, plugs or the like also come in as shut-off organs 15. Consideration. In the embodiment according to FIGS. 3 and 4, the intermediate walls 4, 5 are formed to form an opening 14 above the bottom 17 of the chamber container 1 with respect to the right-angled bordering intermediate walls 4 or 5 are mounted vertically displaceable. For this purpose, e.g. B. posts 18 may be provided which have four U-shaped guide strips in cross section.

A further embodiment is shown in FIG. 5. In this case, the openings 14 causing the overflow from chamber to chamber are shown through the upper edge 19 of the intermediate walls 4, 5, while the lateral boundaries of the flow path are formed by edge elements 20 which are fastened on the upper edges 19 of the intermediate walls 4, 5, preferably a releasable fastening being provided. In this embodiment, the upper edges 19 of the intermediate walls 4, 5 run at the level of the liquid 13, which is determined by the arrangement of the drain pipe 12. The upper edges of the side and end walls 2, 3 of the chamber container 1 are higher. 5 shows a different flow path. The edge elements 20 are arranged on the upper edge of the intermediate walls 4, 5 such that the waste water cascades from an inlet chamber 21 into the first two side chambers 6, from there into a middle chamber 7 and in the opposite direction to the next chamber 7 flows, enters the adjacent chamber 8 and flows through all the chambers 8, via the two remaining middle chambers 7 the waste water reaches the last two chambers 6 and the outlet chamber 22. Such an embodiment can eg be suitable for two-stage operation after the activated sludge process.

The wastewater treatment device shown in FIGS. 6 and 7 is equipped with devices for mechanical pre-cleaning _. , Pre-clarification, biological and / or chemical cleaning, post-clarification and sludge treatment completely arranged in a transportable container 23. The main component is the chamber container 1, which is constructed similarly to that shown in FIG. 5. In this embodiment, eighteen chambers 6 to 8 are provided, which are also in three side by side the rows are arranged, of which the chambers 6 and 8 located on the two sides serve for preliminary and / or subsequent clarification, while the middle row with the chambers 7 is available for biological and / or chemical cleaning stands. The three chambers 6, 7, 8 lying side by side transversely to the three rows are each combined to form subassemblies 9. A total of six modules 9 are provided in the embodiment according to FIG. 6, which are assembled in a modular manner in a row to form the chamber container 1. The two outer rows with the chambers 6 and 8 are channel-shaped and each have a screw conveyor 10 which runs parallel to the side walls 2.

The upper edges 19 of the intermediate walls 4, 5 lie in a plane which is lower than the edge of the side and end walls 2, 3 of the chamber container 1, so that the chamber container 1 has a raised edge all around. Around the waste water in a cascade through the pre-clarification chambers

6 to the biological and / or chemical cleaning chambers 7 and further to flow through the chambers 8 used for clarification, ie to determine the overflow paths for the waste water, edge elements 20 are provided which are on the upper edges 19 of the intermediate walls 4, 5 are fastened and form the side boundaries for the flow path which the waste water is to take. Preferably, the edge elements 20 are releasably attached, e.g. by means of a tongue and groove connection, as indicated in FIG. 7, by side eyelets and plug bolts or the like. In this way, the flow paths can be adapted to the local operating conditions and can also be changed subsequently. In the embodiment according to FIGS. 6 and 7, five of the side chambers 6 and 8 are of the adjacent middle chambers

7 delimited by attached edge elements 20, with between. see the side chamber 6 lying on the right in FIG. 6 and the adjacent middle chamber 7 and the middle chamber 7 on the left and the adjacent left side chamber 8, no edge elements 20 are provided. at In this arrangement, the waste water flows in a cascade manner through the lateral chamber 6 (from left to right in FIG. 6), then over the upper edge 19 of the last chamber 6 into the adjacent middle chamber 7. From there, the waste water continues to flow through the middle chambers 7 (from right to left in FIG. 6) to the last chamber 7 of the middle row and flows into the adjacent lateral chamber 8 and further in this row (from left to right in FIG. 6) to the last chamber 9 While preliminary clarification takes place in the lateral chambers 6 and secondary clarification by sedimentation takes place in the lateral chambers 8, ventilation devices 24 for forming activated sludge chambers and / or immersion bodies can be arranged in the chambers 7 of the middle row in order to use a cleaning method suitable for the waste water - to be able to. Devices for an activated sludge return or for the addition of chemical precipitants or the like can also be provided.

The facilities for mechanical pre-cleaning and for sludge treatment and storage are also arranged in container 23. A mechanical pre-cleaning device 26 can consist, for example, of a gravity sieve 27 and a collecting container 28 for the trapped dirt particles. The pre-cleaning device 26 is connected by an inlet pipe 11 to an inlet chamber 21 which is attached to the end face of the chamber container 1. The waste water flows in a cascade manner over an overflow edge 33 into the first lateral chamber 6.

Behind the last chamber 8 used for clarification, a drain chamber 22 is provided, into which the cleaned water flows in a cascade shape and which is equipped with a drain pipe 12.

The sludge deposited on the bottom of the lateral chambers 6 and 8 is gently drawn off by the screw conveyors 10 and is disposed in the sludge treatment treatment arranged in the container 23. container 29 supplied, which is equipped with a circulating device 30. In the sludge treatment tank 29, the sludge is treated aerobically and stabilized, the exothermic reaction creating a temperature level suitable for the stabilization. The stabilized sludge is conveyed via a pipe 31 into a stacking container 32 which, in the exemplary embodiment, is arranged laterally next to the chamber container 1.

The devices belonging to the waste water purification device are, if necessary, locked in the usual way to avoid unpleasant smells.

Depending on the desired size of the wastewater treatment device, the number of assemblies strung together can be varied. The funnel-shaped bottom of the chambers 6 and 8 can, as shown in FIG. 7, run obliquely up to the intermediate wall 4, or run in a wedge shape in accordance with FIGS. 1 and 5.

The chamber container can also have a circular plan with a sector-like and / or annular subdivision. Likewise, designs with triangular or polygonal chambers in plan can prove to be favorable.

The chamber container 1 can also consist of glass fiber reinforced plastic or also of concrete. A suitable material such as sheet steel, plastic or the like can also be used for the edge elements 20. It is also possible to make the chamber container 1 stationary in concrete or the like.

Claims

1. Wastewater treatment device with facilities for mechanical pre-cleaning, pre-clarification, biological and / or chemical cleaning, secondary clarification and sludge treatment, characterized in that a chamber container (1) through partition walls (4,5) in a plurality of chambers (6 to 8), which are communicatively connected to one another for a successive flow of wastewater and that a device determining the liquid level (13) is provided.

2. Waste water purification device according to claim 1, characterized in that the last chamber (8) through which the wastewater flows is associated with a liquid level (13) determining flow (2).

3. Waste water purification device according to claim 1 or 2, characterized in that all adjacent chambers (6 to 8) are interconnected by closable openings (14).

4. Waste water purification device according to one of claims 1 to 3, characterized by edge elements (20) which are releasably attachable to the upper edges (19) of the intermediate walls (4, 5) lying in one plane for an optional determination of an overflow path for the waste water.

5. Wastewater treatment device according to one of claims 1 to 3, characterized in that each opening (14) is provided with a shut-off device (15).

6. Waste water purification device according to one of claims 1 to 3, characterized in that the intermediate walls (4,5) to form an opening (14) above the bottom (17) of the chamber container (1) with respect to the right-angled-

5 the partition walls (4,5) are vertically displaceable.

7. Waste water purification device according to one of claims 1 to 6, characterized in that the chambers (6 to 8) 0 are arranged in three adjacent rows and the chambers (6, 8) of the two outer rows are channel-shaped and with a screw conveyor (10) are provided.

5 8. Wastewater treatment device according to claim 7, characterized in that the transverse to the three rows next to each other three chambers (6 to 8) are combined to form an assembly (9) which, with the same assemblies (9), is modular to one Let row assemble. 0

9. Waste water purification device according to claim 7 or 8, da¬ characterized in that in the chambers (7) of the middle row ren ventilation devices (24) and / or immersion bodies (25) are arranged.

25

10. Waste water purification device according to one of claims 1 to 9, characterized in that the chamber container (1) is arranged in a container (23).

30 11. Waste water purification device according to one of claims 1 to 10, characterized in that in the container (23) ei¬ ne mechanical pre-cleaning device (26) is arranged, which is connected by an inlet pipe (11) to an inlet chamber (21) to which one at one end of the

35 chamber container (1) lying lateral chamber (6) by means of an overflow edge (33) is connected.

12. Wastewater treatment device according to one of claims 1 to 11, characterized in that the side chamber (8) serving the final clarification in the direction of flow is connected to a drain chamber (22) connected to a drainage channel.

13. Waste water purification device according to one of claims 1 to 12, characterized in that the screw conveyor

(10) of the lateral chambers (6, 8) are connected via a pipe to a sludge treatment container (29) arranged in the container (23).

14. Wastewater treatment device according to one of claims 1 to 13, characterized in that in the container (23) a stack container (32) connected to the sludge treatment container (29) is arranged for the treated sludge.

15. Waste water purification device according to one of claims 1 to 14, characterized in that the stacking container

(32) is arranged laterally next to the chamber container (1).