TW202313186A - Waste water treatment apparatus and washing method for waste water treatment apparatus capable of washing a separation membrane by utilizing the waste water - Google Patents

Abstract

The present invention relates to a waste water treatment apparatus and a washing method for the waste water treatment apparatus. It is capable of washing a separation membrane by utilizing the waste water, and also suitably removing the contaminating substances accumulated on the upper portion side of the separation membrane. The waste water treatment apparatus (1) includes: at least two anaerobic waste water treatment tanks (2A, 2B) that are arranged adjacently; separation membranes (10, 10) that are respectively disposed in two anaerobic waste water treatment tanks (2A, 2B) for filtering the waste water; and gas distributing pipes (11, 11) which are respectively arranged under the two separation membranes (10, 10) and supply gas bubbles toward the two separation membranes (10, 10). In addition, the waste water treatment apparatus (1) includes: a communication passage (5) that is located below the two separation membranes (10, 10) and communicates the two anaerobic waste water treatment tanks (2A, 2B) with each other; and a pressure difference generating unit (6) that generates a pressure difference between two anaerobic waste water treatment tanks (2A, 2B).

Description

Drainage treatment device and method for cleaning the drainage treatment device

The invention relates to a drainage treatment device and a cleaning method for the drainage treatment device.

An anaerobic membrane separation method (anaerobic MBR: Membrane Bio Reactor: Membrane Bioreactor) is known as a wastewater treatment technology for treating industrial wastewater, domestic wastewater, and other wastewater. Anaerobic membrane separation method is an excellent wastewater treatment technology that can decompose organic matter in wastewater into methane and carbon dioxide by using microorganisms to separate solids and liquids through a separation membrane.

Generally, in a wastewater treatment device using an anaerobic membrane separation method, as the use continues, fouling substances such as residues and dirt adhere to the surface and pores of the separation membrane to cause clogging (fouling), so the separation membrane needs to be cleaned. The fouling of the separation membrane reduces the permeation flow rate (flux), which greatly affects the wastewater treatment performance.

Conventionally, as a method of cleaning a separation membrane, cleaning with an air diffusion tube, cleaning with a chemical solution, and the like are known (for example, refer to Patent Documents 1 and 2).

In the cleaning using the air diffuser pipe, the air diffuser pipe is installed under the separation membrane to generate air bubbles, and the gas-liquid mixed flow of the air bubbles formed by the rise of the air bubbles and the drain (water to be treated) is brought into contact with the surface of the separation membrane, Contaminating substances adhering to the surface of the separation membrane are thereby removed. Usually, the cleaning by the diffuser pipe is continuously performed during the operation of the wastewater treatment device. On the other hand, washing with a chemical solution is performed periodically by immersing the separation membrane in a chemical solution of a predetermined concentration, for example. In this case, the separation membrane is also taken out of the tank and immersed in the chemical solution. [Prior Art Literature] [Patent Document]

Patent Document 1: Japanese Patent Application Laid-Open No. 09-117646 Patent Document 2: Japanese Patent Application Laid-Open No. 09-117789

[Problem to be solved by the invention]

However, in the above-mentioned cleaning using the diffuser tube, the upward flow of the gas-liquid mixed flow caused by the rise of the air bubbles is used, so the pollutants tend to accumulate on the upper side of the separation membrane, and it is difficult to remove the accumulated pollutants. Such subjects. In addition, in cleaning with a chemical solution, anaerobic bacteria in the tank are affected during the cleaning, and therefore, realization of a separation membrane cleaning technique that does not use a chemical solution is desired. The object of the present invention is to solve the above-mentioned problems and provide a waste water treatment device and a waste water treatment device that can clean the separation membrane by using the waste water (water to be treated) and can also preferably remove the pollutants accumulated on the upper side of the separation membrane. cleaning method. [means to solve the problem]

In order to solve the above problems, the present invention provides a wastewater treatment device, characterized in that the wastewater treatment device includes: at least two anaerobic wastewater treatment tanks arranged adjacently; An anaerobic drainage treatment tank for filtering drainage; diffuser pipes, which are respectively arranged under the two separation membranes, and supply gas bubbles toward the two separation membranes; communication passages, which are connected between the two separation membranes. The lower part of the separation membrane communicates the two anaerobic wastewater treatment tanks with each other; and a pressure difference generating part generates a pressure difference between the two anaerobic wastewater treatment tanks.

In the wastewater treatment device of the present invention, a water level difference can be formed by creating a pressure difference between one anaerobic wastewater treatment tank and the other anaerobic wastewater treatment tank, and an anaerobic drainage with a higher water head can be formed. The water flowing from the treatment tank to the anaerobic wastewater treatment tank with a low water head through the communicating passage. With this water flow, in the anaerobic wastewater treatment tank with a high water head, a downward flow opposite to the upward flow of the gas-liquid mixed flow formed by the rise of the air bubbles in the diffuser pipe is suddenly formed, and it will be accumulated in the Contaminated substances on the upper side of the separation membrane are peeled off downward. Accordingly, it is possible to desirably remove fouling substances accumulated on the upper side of the separation membrane by using the discharged water (water to be treated). Therefore, the frequency of cleaning with the chemical solution can be reduced.

In addition, it is preferable that the pressure difference generating part includes: a gas recovery pipe, which is respectively connected to the two anaerobic drainage treatment tanks; a recovery side on-off valve, which is arranged in the gas recovery pipe; a gas supply pipe , which are respectively connected to the two gas diffuser pipes; supply-side on-off valves, which are provided on the two gas supply pipes; and a control unit, which controls the two recovery-side on-off valves and the two supply-side on-off valves The opening and closing of the valve is controlled.

In this configuration, the opening and closing of the two recovery-side on-off valves and the two supply-side on-off valves are controlled by the controller, thereby enabling easy cleaning using the head pressure. For example, when cleaning one anaerobic wastewater treatment tank, the control unit opens the recovery-side on-off valve of the tank and closes the supply-side on-off valve of the tank. Then, the recovery-side on-off valve of the other anaerobic wastewater treatment tank is closed by the control unit, and the supply-side on-off valve of the other anaerobic wastewater treatment tank is opened. In this way, in another anaerobic wastewater treatment tank, the air pressure continues to increase, and under the action of the increased gas, the water level in the other tank decreases. As the water level decreases, the drain (water to be treated) flows from the other anaerobic wastewater treatment tank to one anaerobic wastewater treatment tank through the communicating passage, and the water level of one anaerobic wastewater treatment tank rises. When the water level of one anaerobic wastewater treatment tank rises to a predetermined height, the recovery-side on-off valve of the other anaerobic wastewater treatment tank is opened by the control unit. As a result, the drainage (water to be treated) suddenly flows from one anaerobic drainage treatment tank through the communication path into another anaerobic drainage treatment tank, and the drainage (water to be treated) can be used to preferably remove the waste water accumulated in one anaerobic drainage treatment tank. Sewage treatment tank for dirty substances on the upper side of the separation membrane.

In addition, it is preferable that the gas collected by the two gas recovery pipes is supplied to the two gas supply pipes by a blower.

In this structure, the gas recovered by the two gas recovery pipes is circulated again to the two anaerobic wastewater treatment tanks, so that efficient cleaning of the separation membrane can be realized.

In order to solve the above problems, the present invention provides a method for cleaning a wastewater treatment device. The wastewater treatment device includes: at least two anaerobic wastewater treatment tanks arranged adjacently; An anaerobic drainage treatment tank for filtering drainage; air diffuser pipes, which are respectively arranged under the two separation membranes, and supply gas bubbles toward the two separation membranes; and communication passages, which are connected between the two separation membranes The lower part of the separation membrane connects the two anaerobic drainage treatment tanks. It is characterized in that the cleaning method of the drainage treatment device includes: a water level difference forming step, by creating a pressure difference between the two anaerobic drainage treatment tanks, so that the pressure difference between the two anaerobic drainage treatment tanks forming a water level difference; and a water flow forming step of forming a water flow flowing from the anaerobic wastewater treatment tank on the higher water head side to the anaerobic wastewater treatment tank on the lower water head side through the communicating path.

In the cleaning method of the drainage treatment device of the present invention, the water level difference can be formed between the two anaerobic drainage treatment tanks by the water level difference forming step, and the communication passage from the side with the higher water head can be formed by the water flow forming step. Flow of water towards the side with lower head. This water flow is a downward flow opposite to the upward flow of the gas-liquid mixed flow formed by the rise of air bubbles in the diffuser tube, so it functions to peel off the dirty substances accumulated on the upper side of the separation membrane downward. . Accordingly, it is possible to desirably remove fouling substances accumulated on the upper side of the separation membrane by using the discharged water (water to be treated). Therefore, the frequency of cleaning with the chemical solution can be reduced. [Effect of the invention]

In the waste water treatment device and the cleaning method of the waste water treatment device according to the present invention, the separation membrane can be cleaned by the waste water, and the fouling substances accumulated on the upper side of the separation membrane can also be preferably removed.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, the up-down direction is a vertical direction perpendicular to the surface of the waste water treatment device on which the anaerobic waste water treatment tank is installed.

As shown in FIG. 1 , the waste water treatment apparatus 1 includes anaerobic waste water treatment tanks 2A, 2B, membrane units 10 , 10 , and diffuser pipes 11 , 11 . In addition, the wastewater treatment device 1 includes a pressure difference generating member 6 that generates a pressure difference between the two anaerobic wastewater treatment tanks 2A, 2B. Details of the pressure difference generating unit 6 will be described later.

Anaerobic wastewater treatment tanks 2A and 2B (hereinafter, referred to as "treatment tanks 2A and 2B") are adjacently arranged via a partition wall 2a formed in the left and right central parts. The respective treatment tanks 2A and 2B are hermetically sealed, and are configured so that drain water W1 , which is water to be treated, flows in, respectively. The waste water W1 is supplied to the treatment tanks 2A and 2B by a liquid-feeding pump (not shown) provided in the middle of the waste water supply path. Examples of the wastewater W1 include industrial wastewater discharged from factories and the like, domestic wastewater (sewage water), and the like. Moreover, in each treatment tank 2A, 2B, the water level W1a of the drain W1 is set to the height which can immerse the whole membrane unit 10,10.

A communication passage 5 that communicates the treatment tanks 2A and 2B with each other is formed at the lower portion of the partition wall 2a. The communication passage 5 allows the drainage W1 to flow between the treatment tanks 2A and 2B, and has an opening area that does not become resistance to the flow of the drainage W1 between the treatment tanks 2A and 2B. The opening of the communication passage 5 is formed at a position lower than the membrane units 10 , 10 of the treatment tanks 2A, 2B.

In addition, a space allowing the water level of the drain W1 to rise is formed in the upper part of the inner space of the treatment tanks 2A, 2B. In addition, the treatment tanks 2A and 2B include discharge passages (not shown) for discharging excess sludge.

The membrane unit 10 includes a plurality of membrane elements composed of known separation membranes. As for the membrane unit 10, the membrane unit of the same specification is used for each processing tank 2A, 2B. The membrane elements are in a flat shape with high aggregation. In addition, a membrane element having a different shape such as a cylindrical shape may be used.

As the separation membrane, a microfiltration membrane (MF membrane) is preferably used. Examples of the shape of the separation membrane include hollow fiber membranes, flat membranes, tubular membranes, and bag-like membranes. When comparing based on volume, hollow fiber membranes with larger membrane areas are preferable.

Examples of the material of the separation membrane include organic materials (cellulose, polyolefin, polyvinyl alcohol, polymethyl methacrylate, polyvinylidene fluoride, polytetrafluoroethylene, etc.). The material of the separation membrane is appropriately selected according to the characteristics of the water to be treated.

The membrane unit 10 is formed, for example, by holding a plurality of membrane elements on a frame-shaped frame. A permeated water discharge passage 12 for discharging permeated water W2 from a plurality of membrane elements is connected to an upper portion of the membrane unit 10 . The permeated water discharge passages 12, 12 of the respective membrane units 10, 10 merge into one on the downstream side. A suction pump (not shown) is provided in the middle of this merging passage. The permeated water W2 is sucked by a suction pump and discharged to the outside, and sent to a subsequent advanced treatment facility (nitrogen treatment method) or an anammox treatment device not shown in the figure to remove nitrogen.

The diffuser pipes 11 are disposed below the respective membrane units 10 , 10 . The diffuser pipe 11 blows the biogas supplied from the blower 19 toward the membrane elements of the membrane unit 10 . The air diffuser pipe 11 is provided with a plurality of discharge holes for gas discharge. A gas supply pipe 13 is connected to each of the diffuser pipes 11 , 11 . Each of the gas supply pipes 13 , 13 is configured to be connected to a main pipe 18 connected to a blower device 19 , and to receive gas supply through the main pipe 18 . The air bubbles generated in the diffuser pipe 11 rise to form a gas-liquid mixed flow of the air bubbles and the drain water W1. In addition, biogas is a gas containing methane gas, carbon dioxide, nitrogen, hydrogen sulfide, and the like.

Pressure difference generating means 6 includes gas recovery pipes 15 , 15 , recovery side on-off valves 16 , 16 , gas supply pipes 13 , 13 , supply side on-off valves 14 , 14 , and a control unit 30 .

One end of the gas recovery pipes 15, 15 is connected to the treatment tanks 2A, 2B, and biogas is recovered from the inner spaces of the treatment tanks 2A, 2B. The recovery-side on-off valves 16 , 16 are provided in the middle of the gas recovery pipes 15 , 15 , and are operated under the control of the control unit 30 . The recovery side on-off valve 16 permits recovery of biogas when opened, and prevents recovery of biogas when closed. The other ends of the gas recovery pipes 15 and 15 are connected to a recovery-side main pipe 17 . The downstream end of the recovery-side main pipe 17 is connected to an air storage tank 20 . The gas storage tank 20 has a function of storing surplus biogas if it is produced. The end of the main pipe 18 is connected to the main pipe 17 on the recovery side.

One end of the gas supply pipes 13 , 13 is connected to the air diffuser pipes 11 , 11 , and biogas is supplied to the air diffuser pipes 11 , 11 . The other ends of the gas supply pipes 13 and 13 are connected to a main pipe 18 . The supply-side on-off valves 14 , 14 are provided in the middle of the gas supply pipes 13 , 13 , and are operated under the control of the control unit 30 . The supply-side on-off valve 14 allows biogas to be supplied to the diffuser pipe 11 when opened, and prevents biogas from being supplied to the diffuser pipe 11 when closed. The upstream side of the main pipe 18 is connected to the main pipe 17 on the recovery side.

The control unit 30 is a device that controls the opening and closing of the recovery-side on-off valves 16 , 16 and the supply-side on-off valves 14 , 14 . The control unit 30 includes, for example, a CPU (Central Processing Unit: central processing unit), RAM (Random Access Memory: random access memory), ROM (Read Only Memory: read only memory), input and output circuits, and the like. The control unit 30 executes control by performing various processes based on input from the input device, programs, data, and the like stored in the ROM.

Next, a method of cleaning the wastewater treatment device executed under the control of the control unit 30 will be described. Fig. 2 is a diagram illustrating a method of cleaning a wastewater treatment device, and is a diagram illustrating a step of forming a water head difference. Fig. 3 is a diagram illustrating a method of cleaning a wastewater treatment device, and is a diagram illustrating a water flow forming step.

In addition, during normal operation without applying a pressure difference, as shown in FIG. 1 , water levels W1a, W1a are set so that the entire membrane units 10, 10 can be submerged in the treatment tanks 2A, 2B. During normal operation, under the control of the control unit 30, the recovery-side on-off valves 16, 16 and the supply-side on-off valves 14, 14 are all opened, and the biogas ejected from the blower device 19 passes through the main pipe 18 and the gas supply pipe 13, 13 diffuses air from the air diffuser pipes 11, 11 into the treatment tanks 2A, 2B. Then, after the biogas diffused into the treatment tanks 2A and 2B is released into the internal space of the treatment tanks 2A and 2B, it is recovered by the gas recovery pipes 15 and 15, flows into the main tube 18 from the recovery side main tube 17, and is again blown by the blower. The device 19 sprays into the main pipe 18 . That is, during normal operation, the biogas circulates along such a circulation route, thereby maintaining the treatment tanks 2A and 2B as environments suitable for the survival of anaerobic microorganisms.

The cleaning method of the wastewater treatment device 1 includes a water level difference forming step and a water flow forming step. Hereinafter, the processing tank 2A on the left will be described as a cleaning object.

The water level difference forming step is a step of generating a pressure difference between the treatment tank 2A and the treatment tank 2B to form a water level difference. Specifically, on the treatment tank 2A side, the recovery-side on-off valve 16 is opened, and the supply-side on-off valve 14 is in a closed state. On the other hand, on the processing tank 2B side, the recovery-side on-off valve 16 is in a closed state, and the supply-side on-off valve 14 is in an open state. If so installed, then on the treatment tank 2B side, the biogas is continuously supplied from the diffuser pipe 11 in the state where the gas recovery pipe 15 is closed, so the volume of the internal space of the treatment tank 2B increases due to the stagnation of the biogas, and the internal space pressure becomes high. Thereby, the water level W1a at the height shown in FIG. 1 during normal operation of the treatment tank 2B is lowered to the low water level W1c shown in FIG. 2 .

In this way, the wastewater W1 stored in the treatment tank 2B flows into the treatment tank 2A through the communication passage 5, and the water level W1a of the treatment tank 2A at the height shown in FIG. 1 during normal operation is raised to the high water level W1b shown in FIG.

Accordingly, a water level difference is formed between the treatment tank 2A and the treatment tank 2B.

The water flow forming step is based on the water level difference formed between the treatment tank 2A and the treatment tank 2B by the water level difference forming step to form the treatment tank from the treatment tank 2A on the side with a higher water head through the communication passage 5 to the treatment tank on the side with a lower water head. 2B The steps of the flowing water stream. The peak of the water level difference can be detected by monitoring the water level of the treatment tank 2A with a sensor or the like, for example.

In the water flow forming step, the recovery-side on-off valve 16 on the treatment tank 2A side is kept open, and the supply-side on-off valve 14 is kept in a closed state. On the other hand, on the treatment tank 2B side, the recovery-side on-off valve 16 is switched to an open state, and the supply-side on-off valve 14 is maintained in an open state. By doing so, the biogas remaining in the inner space of the treatment tank 2B is recovered through the gas recovery pipe 15, and the pressure in the inner space of the treatment tank 2B drops rapidly. Thereby, the water level of the treatment tank 2B rises from the low water level W1c to the water level W1a during normal operation.

In this way, the waste water W1 stored at the high water level W1b in the treatment tank 2A returns to the treatment tank 2B through the communication path 5 . At this time, the water flow generated in the treatment tank 2A is a downward flow opposite to the upward flow of the gas-liquid mixed flow formed by the air bubbles in the diffuser pipe 11, so that the dirt accumulated on the upper side of the membrane unit 10 is removed. The way the substance peels off downwards comes into play. Accordingly, in the treatment tank 2A, the sewage accumulated on the upper side of the membrane unit 10 and the upper side of the membrane element can be preferably removed by the drain W1 (water to be treated).

In the case of cleaning the membrane unit 10 of the treatment tank 2B, contrary to the above-mentioned cleaning method, the pressure in the internal space of the treatment tank 2A is increased to form a water head difference, and the communication passage 5 is formed from the treatment tank 2B on the side with a higher water head. The water flow that flows to the treatment tank 2A on the lower side of the water head. Accordingly, on the side of the treatment tank 2B, the sewage accumulated on the upper side of the membrane unit 10 and the upper side of the membrane element can be preferably removed by the drain W1 (water to be treated).

In the wastewater treatment device 1 of the present embodiment described above, a water level difference can be formed by generating a pressure difference between the treatment tank 2A and the treatment tank 2B. 5 The water flow flowing to the treatment tank 2B with a lower water head. In the treatment tank 2A, this water flow is a downward flow opposite to the upward flow of the gas-liquid mixed flow formed by the air bubbles in the diffuser pipe 11, so that the dirt accumulated in the membrane unit 10 and the upper side of the membrane element The way the substance peels off downwards comes into play. Thereby, the fouling substances accumulated on the upper side of the membrane unit 10 or the membrane element can be preferably removed by the drain W1 (water to be treated).

Therefore, the frequency of cleaning with the chemical solution can be reduced.

In addition, the opening and closing of the two recovery-side on-off valves 16, 16 and the two supply-side on-off valves 14, 14 are controlled by the controller 30, thereby enabling easy cleaning using head pressure. For example, the control unit 30 can perform cleaning at a predetermined cycle such as once a day, once a week, or the like.

Alternatively, a sensor may be used to detect the suction pressure of the suction pump, and when the suction pressure is greater than a predetermined value, it may be determined that fouling has occurred on the membrane unit 10, and the control unit 30 may automatically perform cleaning. .

In addition, since the biogas recovered by the two gas recovery pipes 15 and 15 is supplied to the two gas supply pipes 13 and 13 through the blower 19, efficient cleaning of the membrane unit 10 can be realized.

In addition, in the cleaning method of the wastewater treatment device 1 of the present embodiment, a water level difference can be formed between the treatment tanks 2A and 2B by the water level difference forming step, and a water flow can be formed to communicate from the higher water head side by the water flow forming step. Channel 5 flows to the lower side of the water head. This water flow is a downward flow opposite to the upward flow of the gas-liquid mixed flow formed by the air bubbles in the diffuser pipe 11, so that the dirty substances accumulated in the membrane unit 10 and the upper side of the membrane element are peeled off downward. way to play a role. Thereby, the fouling substances accumulated on the upper side of the membrane unit 10 or the membrane element can be preferably removed by the drain W1 (water to be treated).

Therefore, the frequency of cleaning with the chemical solution can be reduced.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can change suitably in the range which does not deviate from the summary.

For example, in the above-described embodiment, it is configured to form a water level difference between the treatment tank 2A and the treatment tank 2B by using the biogas transported from the air blower 19 to the diffuser pipe 11, but it is not limited to this, and it may also be configured not to use The air blowing device 19 increases the pressure of the internal space by accumulating biogas naturally produced from the stored drainage W1.

In addition, in the said embodiment, the case where the water level difference was formed between two adjacent processing tanks 2A, 2B was demonstrated and it wash|cleaned, but it is not limited to this. Also in the wastewater treatment device 60 of the treatment tanks 61 to 63 and the preliminary tank 55 , the membrane unit 10 can be preferably cleaned by utilizing the water level difference.

The treatment tanks 61 to 63 shown in FIG. 4 each include the membrane unit 10 and each include the communication passage 5 on the two partition walls 2a, 2a. Furthermore, each of the treatment tanks 61 to 63 similarly includes a gas recovery pipe 15, a recovery side on-off valve 16, a gas supply pipe 13, and a supply side on-off valve 14, and a control unit 30 for controlling their opening and closing.

In such a waste water treatment device 60, for example, in the case of cleaning the membrane unit 10 of the treatment tank 61, the supply-side on-off valve 14 of the treatment tank 61 is closed and the valves of the treatment tanks 62, 63 are closed by the water head forming step. Each recovery-side opening and closing valve 16 increases the pressure of each internal space of the treatment tanks 62 and 63 . As a result, the water levels of the treatment tanks 62 and 63 are respectively lowered, and the water level of the treatment tank 61 is raised instead, thereby forming a water level difference between the treatment tank 61 and the treatment tanks 62 and 63 .

When the water level difference is formed, the recovery-side on-off valve 16 is kept open and the supply-side on-off valve 14 is kept closed on the treatment tank 61 side by the water flow forming step. On the other hand, on the treatment tanks 62 and 63 side, each recovery-side on-off valve 16 is switched to an open state, and each supply-side on-off valve 14 is maintained to an open state. As a result, the pressures in the internal spaces of the treatment tanks 62 and 63 respectively decrease, and the respective water levels of the treatment tanks 62 and 63 rise from the low water level to the water level during normal operation. As a result of this upward movement, the drain water W1 suddenly flows from the treatment tank 61 through the communication passage 5 into the treatment tanks 62 and 63 . At this time, the water flow generated in the treatment tank 61 is a downward flow opposite to the upward flow of the gas-liquid mixed flow formed by the air bubbles in the diffuser pipe 11, so that the pollutants accumulated on the upper side of the membrane unit 10 The way you peel it down works. Accordingly, in the treatment tank 61 , the sewage accumulated on the upper side of the membrane unit 10 and the upper side of the membrane elements can be preferably removed by the waste water W1 (water to be treated).

In addition, regarding cleaning of the respective membrane units 10, 10 of the treatment tanks 62, 63, by similarly forming a water level difference, fouling substances can be preferably removed.

As described above, the wastewater treatment device 60 having three treatment tanks 61 to 63 and the backup tank 55 has been described, but it is not limited thereto. The cleaning of the membrane unit 10 can be performed preferably by utilizing the water level difference.

1: Drainage treatment device 2A, 2B: Anaerobic wastewater treatment tank/treatment tank 2a: next door 5: Connected pathway 6: Pressure difference generating parts 10: Membrane unit 11: Diffuser 12: Through the water discharge channel 13: Gas supply pipe 14: supply side on-off valve 15: Gas recovery pipe 16: On-off valve on recovery side 17: Recovery side supervisor 18: Supervisor 19: Blowing device 20: Gas storage tank 30: Control Department 60: Drainage treatment device 61,62,63: processing tank W1: drainage W1a: water level W1b: High water mark W1c: Low Water W2: through water

FIG. 1 is a configuration diagram showing a wastewater treatment device according to an embodiment of the present invention. Fig. 2 is a diagram illustrating a method of cleaning a wastewater treatment device according to an embodiment of the present invention, and is a diagram illustrating a step of forming a water head difference. Fig. 3 is a diagram illustrating a method of cleaning a wastewater treatment device according to an embodiment of the present invention, and is a diagram illustrating a water flow forming step. Fig. 4 is a schematic plan view showing a layout example of a waste water treatment device according to an embodiment of the present invention.

1: Drainage treatment device

2A, 2B: Anaerobic wastewater treatment tank (treatment tank)

2a: next door

5: Connected pathway

6: Pressure difference generating parts

10: Membrane unit

11: Diffuser

12: Through the water discharge channel

13: Gas supply pipe

14: supply side on-off valve

15: Gas recovery pipe

16: On-off valve on recovery side

17: Recovery side supervisor

18: Supervisor

19: Blowing device

20: Gas storage tank

30: Control Department

W1: drainage

W2: through water

W1a: water level

Claims (4)

A drainage treatment device, comprising: At least two anaerobic drainage treatment tanks are arranged adjacently; Separation membranes are respectively installed in the aforementioned two anaerobic drainage treatment tanks for filtering drainage; Gas diffuser tubes are respectively arranged under the two aforementioned separation membranes, and supply gas bubbles toward the two aforementioned separation membranes; a communication passage for communicating the aforementioned two anaerobic drainage treatment tanks with each other under the two aforementioned separation membranes; and The pressure difference generating part generates a pressure difference between the aforementioned two anaerobic wastewater treatment tanks. The drainage treatment device according to claim 1, wherein the aforementioned pressure difference generating components include: The gas recovery pipe is respectively connected with the aforementioned two anaerobic drainage treatment tanks; The on-off valve on the recovery side is located in the aforementioned gas recovery pipe; The gas supply pipe is respectively connected with the two aforementioned diffuser pipes; supply-side on-off valves provided in the two aforementioned gas supply pipes; and The control unit controls opening and closing of the two recovery-side on-off valves and the two supply-side on-off valves. The waste water treatment device according to claim 2, wherein the two gas recovery pipes are connected to the two gas supply pipes via a blower device. A method for cleaning a drainage treatment device, comprising at least two adjacently arranged anaerobic drainage treatment tanks, separation membranes respectively provided in the aforementioned two anaerobic drainage treatment tanks and used for filtering drainage, and respectively arranged in the two anaerobic drainage treatment tanks. Cleaning of a drainage pipe for supplying gas bubbles below the two separation membranes and toward the two separation membranes, and a communication channel connecting the two anaerobic wastewater treatment tanks below the two separation membranes methods, including: The water level difference forming step is to generate a pressure difference between the aforementioned two anaerobic drainage treatment tanks, thereby forming a water level difference between the aforementioned two anaerobic drainage treatment tanks; and The water flow forming step is to form a water flow flowing from the anaerobic wastewater treatment tank on the higher water head side to the anaerobic wastewater treatment tank on the lower water head side through the communication passage.

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