A MBR membrane bioreactor

Abstract

The utility model discloses an MBR membrane bioreactor, comprising an MBR reaction tank, a curtain membrane and an aeration plate arranged in the MBR reaction tank, wherein the curtain membrane is connected to a membrane box, the membrane box is connected to a water pump, the water pump is connected to a bacterial culture chamber, and the water pump is connected to a water outlet pipe via a water pump. Under the action of the suction force of the water pump, the aqueous solution in the reaction tank passes through the capillary pores of the curtain membrane and is pumped into the inner pores of the curtain membrane. The separated aqueous solution is pumped into the membrane box and then into the bacterial culture chamber. Anaerobic bacteria reduce nitrate to nitrogen gas, thereby completing the entire nitrogen cycle. Purified water is pumped out from the water outlet pipe. Compared with traditional water treatment technology, the concentration of activated sludge and the sludge age are increased by more than 2 to 5 times; the concentration of microorganisms can be increased by 2 to 3 times; the biochemical efficiency is increased by 10 to 30%; the sewage retention time is short; the activated sludge retention time is long; the secondary sedimentation tank can be omitted; the sludge discharge cycle is long; the operation is simple and can be self-controlled; the service life of the hollow fiber membrane can reach more than 3 years.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to sewage treatment equipment. Background Art

[0002] In traditional wastewater biological treatment technology, mud-water separation is completed by gravity in the secondary sedimentation tank, and its separation efficiency depends on the sedimentation performance of the activated sludge. The better the sedimentation performance, the higher the mud-water separation efficiency. The sedimentation performance of the sludge depends on the operating conditions of the aeration tank. To improve the sedimentation performance of the sludge, the operating conditions of the aeration tank must be strictly controlled, which limits the scope of application of this method.

[0003] Due to the solid-liquid separation requirements of the secondary sedimentation tank, the sludge in the aeration tank cannot maintain a high concentration, generally around 1.5-3.5 g / l, thus limiting the biochemical reaction rate. The hydraulic retention time (HRT) and the sludge age (SRT) are interdependent, and increasing the volume load and reducing the sludge load often conflict. The system also produces a large amount of excess sludge during operation, and its disposal costs account for 25% to 40% of the operating costs of the sludge water treatment plant. Traditional activated sludge treatment systems are also prone to sludge swelling, suspended solids in the effluent, and deterioration of effluent water quality. Utility Model Content

[0004] The technical problem solved by the utility model is that the application scope of the traditional wastewater biological treatment technology is limited, a large amount of residual sludge is generated during the operation, sludge swelling phenomenon is prone to occur, and the effluent water quality deteriorates.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: an MBR membrane bioreactor, comprising an MBR reaction tank, a curtain membrane and an aeration plate arranged in the MBR reaction tank, the curtain membrane is connected to the membrane box, the membrane box is connected to the water pumping pipe, the water pumping pipe is connected to the culture chamber, and the water pumping pipe is connected to the water outlet pipe via a water pump.

[0006] Raw water is poured into the MBR reaction tank, and the raw water level is controlled by the liquid level controller. After the raw water level reaches the set height, the aeration plate is aerated, and the MBR reaction tank achieves the purpose of oxygenation. The mixed aqueous solution, under the action of the suction force of the pump, passes through the capillary pores of the MBR curtain membrane and is pumped into the inner pores of the MBR curtain membrane, which greatly improves the solid-liquid separation efficiency. The efficient interception effect of the membrane allows the microorganisms to be completely intercepted in the reactor, realizing the complete separation of the reactor hydraulic retention time (HRT) and the sludge age (SRT), making the operation control more flexible, which is conducive to the growth and reproduction of slowly proliferating nitrifying bacteria, and the nitrification efficiency of the system can be improved. By changing the operation mode, it has the functions of denitrification and phosphorus removal. The microbial mass concentration in the reactor is high and resistant to shock loads.

[0007] The separated aqueous solution is pumped into the membrane box through the inner cavity of the MBR curtain membrane, and then pumped into the sealed bacterial culture chamber. By cultivating anaerobic bacteria (including denitrifying paracocci and various pseudomonas), nitrate is reduced to nitrogen gas, thus completing the entire nitrogen cycle. The water pipe pumps the bacteria-carrying and purified water into the water pump, and then pumps it out from the outlet pipe. In this way, the purpose of sewage treatment is achieved.

[0008] The membrane box includes an end membrane box and an intermediate membrane box, which are installed on a membrane frame, the curtain membrane is arranged between the end membrane box and the intermediate membrane box, and the water flow pipe connects the end membrane box and the intermediate membrane box and is connected to the bacterial culture chamber. The raw water in the MBR reaction tank enters the end membrane box and the intermediate membrane box after passing through the curtain membrane, and then enters the bacterial culture chamber through the water flow pipe.

[0009] The bacteria culture chamber is arranged on the top of the MBR reaction tank, the bacteria culture chamber and the MBR reaction tank are arranged in the reactor bracket, and the aerator communicated with the aeration disk is arranged on the top of the reactor bracket.

[0010] Several aeration plates are distributed at the bottom of the MBR reaction tank, and the aeration plates are connected to the aerator through aeration pipes. The aeration plates continuously supply air, and a large number of tiny bubbles are generated in the MBR reaction tank. The tiny bubbles rise in the water, and their volume continues to expand / activate, causing vibrations on the surface of the curtain membrane, achieving the effect of cleaning the curtain membrane.

[0011] One end of the water outlet pipe is connected to the top of the bacteria culture chamber, and the other end of the water outlet pipe extends out of the reactor support and is connected to a water pump.

[0012] Nano anaerobic bricks are arranged in the culture room.

[0013] MBR membrane bioreactor, in the field of sewage treatment and water resource reuse, is a new water treatment technology that combines membrane separation unit with biological treatment unit. It is a water treatment technology that replaces the secondary sedimentation tank in the traditional activated sludge method with membrane separation process. Compared with traditional water treatment technology, the concentration of activated sludge (MLSS) and sludge age (SRT) can be increased by more than 2 to 5 times; the concentration of microorganisms can be increased by 2 to 3 times; the biochemical efficiency can be increased by 10 to 30%; the sewage retention time is short; the activated sludge retention time is long; the secondary sedimentation tank can be omitted; the sludge discharge cycle is long; the operation is simple and self-controlled; the service life of the hollow fiber membrane can reach more than 3 years.

[0014] The MBR membrane bioreactor greatly improves the solid-liquid separation efficiency. The increase in the concentration of active sludge in the aeration tank and the emergence of special bacteria (especially dominant bacteria) in the sludge increase the biochemical reaction rate. At the same time, by lowering the F / M ratio, the amount of residual sludge produced is reduced (even to 0), thus basically solving many outstanding problems existing in the traditional activated sludge method. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of MBR membrane bioreactor;

[0017] Figure 2 This is the main view of the MBR membrane bioreactor;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0019] Explanation of symbols in the figure:

[0020] 10. MBR reaction tank;

[0021] 20. Curtain membrane; 21. End membrane box; 22. Middle membrane box; 23. Water flow pipe; 24. PVC joint; 25. Membrane frame; 26. Water flow direction; 27. Water surface;

[0022] 30. Aeration plate; 31. Aerator; 32. Aeration pipe; 33. Connecting hose; 34. Aeration pipe conversion joint; 35. Airflow direction;

[0023] 40. water pump; 41. water pump; 42. water outlet pipe;

[0024] 50. Bacteria culture room; 51. Nano anaerobic bricks. DETAILED DESCRIPTION

[0025] refer to Figures 1 to 3 A MBR membrane bioreactor includes an MBR reaction tank 10, a curtain membrane 20 and an aeration plate 30 arranged in the MBR reaction tank, the curtain membrane is connected to the membrane box, the membrane box is connected to the pumping pipe 40, the pumping pipe is connected to the culture chamber 50, and the pumping pipe is connected to the outlet pipe 42 through the pumping pump 41.

[0026] Raw water is poured into the MBR reaction tank 10, and the raw water level is controlled by the liquid level controller. When the raw water level reaches the set height, the aeration plate 30 is aerated, and the MBR reaction tank 10 achieves the purpose of oxygenation. The mixed aqueous solution, under the action of the suction force of the pump 41, passes through the capillary pores of the MBR curtain membrane 20 and is pumped into the inner pores of the MBR curtain membrane. The separated aqueous solution is pumped into the membrane box from the inner cavity of the MBR curtain membrane 20, and then pumped into the sealed bacterial culture chamber 50. By cultivating anaerobic bacteria, nitrate is reduced to nitrogen gas, thereby completing the entire nitrogen cycle. The pumping pipe 40 pumps the bacterial and purified water into the pumping pump 41, and then pumps it out from the outlet pipe 42.

[0027] The membrane box includes an end membrane box 21 and a middle membrane box 22, which are mounted on a membrane frame 25, with the curtain membrane 20 arranged between the end membrane box and the middle membrane box, and a water flow pipe 23 connecting the end membrane box and the middle membrane box and connected to the bacterial culture chamber 50.

[0028] The bacterial culture chamber 50 is arranged on the top of the MBR reaction tank 10 . The bacterial culture chamber and the MBR reaction tank are arranged in the reactor support. The aerator 31 connected with the aeration disk 30 is arranged on the top of the reactor support.

[0029] A plurality of aeration plates 30 are distributed at the bottom of the MBR reaction tank 10 , and the aeration plates are connected to an aerator 31 through an aeration pipe 32 .

[0030] One end of the water outlet pipe 42 is connected to the top of the bacterial culture chamber 50 , and the other end of the water outlet pipe extends out of the reactor support and is connected to the water pump 41 .

[0031] Nano anaerobic bricks 51 are arranged in the bacterial culture chamber 50 .

[0032] Raw water is poured into the MBR reaction tank 10, and the raw water level is controlled by the liquid level controller. After the raw water level reaches the set height, the aerator 31 starts to work, and the aeration plate 30 is continuously supplied with air through the connecting hose 33, the aeration pipe conversion joint 34, and the aeration pipe 32, so that the MBR reaction tank 10 achieves the purpose of oxygenation. The mixed aqueous solution, under the action of the suction force of the pump 41, passes through the capillary pores of the MBR curtain membrane 20 and is pumped into the inner pores of the MBR curtain membrane, which greatly improves the solid-liquid separation efficiency. The efficient interception effect of the membrane completely intercepts the microorganisms in the reactor, and realizes the complete separation of the reactor hydraulic retention time HRT and the sludge age SRT, making the operation control more flexible, which is conducive to the growth and reproduction of slowly proliferating nitrifying bacteria, and the nitrification efficiency of the system can be improved. By changing the operation mode, it has the functions of denitrification and phosphorus removal, and the microorganism mass concentration in the reactor is high and resistant to shock loads.

[0033] The separated aqueous solution is pumped from the inner cavity of the MBR curtain membrane 20 into the end membrane 21 and the middle membrane box 22 , and then pumped into the bacterial culture chamber 50 through the PVC joint 24 .

[0034] The aeration plate 30 continuously supplies air, and a large number of tiny bubbles are generated in the MBR reaction tank 10. The tiny bubbles rise in the water, and their volume continues to expand / activate, causing vibrations on the surface of the MBR curtain membrane 20, thereby achieving the effect of cleaning the MBR curtain membrane.

[0035] The above contents are only preferred implementation modes of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation mode and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A MBR membrane bioreactor, comprising an MBR reaction tank (10), a curtain membrane (20) and an aeration plate (30) arranged in the MBR reaction tank, characterized in that: The curtain membrane is connected to the membrane box, the membrane box is connected to the water pumping pipe (40), the water pumping pipe is connected to the bacterial culture chamber (50), and the water pumping pipe is connected to the water outlet pipe (42) via the water pump (41).

2. The MBR membrane bioreactor according to claim 1, characterized in that: The membrane box comprises an end membrane box (21) and an intermediate membrane box (22), the end membrane box and the intermediate membrane box are mounted on a membrane frame (25), the curtain membrane (20) is arranged between the end membrane box and the intermediate membrane box, and the water flow pipe (23) connects the end membrane box and the intermediate membrane box and is connected to the bacterial culture chamber (50).

3. The MBR membrane bioreactor according to claim 1, characterized in that: The bacterial culture chamber (50) is arranged on the top of the MBR reaction tank (10), the bacterial culture chamber and the MBR reaction tank are arranged in the reactor support, and the aerator (31) connected to the aeration plate (30) is arranged on the top of the reactor support.

4. The MBR membrane bioreactor according to claim 3, characterized in that: A plurality of aeration plates (30) are distributed at the bottom of the MBR reaction tank (10), and the aeration plates are connected to an aerator (31) through an aeration pipe (32).

5. The MBR membrane bioreactor according to claim 3, characterized in that: One end of the water outlet pipe (42) is connected to the top of the bacterial culture chamber (50), and the other end of the water outlet pipe extends outside the reactor support and is connected to the water pump (41).

6. The MBR membrane bioreactor according to claim 1, characterized in that: Nano anaerobic bricks (51) are arranged in the bacterial culture chamber (50).

Images