Integrated membrane bioreactor for dairy product wastewater treatment

Abstract

The invention discloses an integrated membrane bioreactor for dairy product wastewater treatment, and particularly relates to the technical field of sewage treatment. The integrated membrane bioreactor for dairy product wastewater treatment comprises a box body, a first annular baffle plate, a second annular baffle plate and a third annular baffle plate are sequentially fixed in the box body from the edge to the center, and the interior of the box body is divided into an anaerobic zone, an anoxic zone, an aerobic zone and a settling zone by the first annular baffle plate, the second annular baffle plate and the third annular baffle plate. The effective volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone to the settling zone is 2: 3: 4: 1, fillers are placed in the anaerobic zone, the anoxic zone, the aerobic zone and the settling zone for attaching microorganisms, the settling zone is positioned in the center of the box body, a membrane reactor is arranged in the settling zone, and a plurality of first check valves and a plurality of second check valves are respectively mounted on the third annular baffle and the second annular baffle. The integrated membrane bioreactor treatment system for dairy product wastewater treatment provided by the invention is miniaturized, has higher cost performance, can be recycled, and improves the resource utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to an integrated membrane bioreactor for treating dairy wastewater. Background Art

[0002] Dairy wastewater is characterized by high concentrations of organic matter, rich nitrogen and phosphorus nutrients, and significant fluctuations in water quality and quantity, making it a typical example of high-concentration organic wastewater. If discharged directly without effective treatment, it can cause severe eutrophication and damage the ecological environment. Currently, a combined anaerobic-aerobic biological treatment process is commonly used to treat this type of wastewater. Membrane bioreactor (MBR) technology has been widely used due to its advantages, including high effluent quality, small footprint, and high sludge concentration.

[0003] However, the traditional A² / O-MBR combined process requires the construction of multiple independent reinforced concrete tanks (anaerobic, anoxic, aerobic, and membrane tanks), connected by a complex system of pipes, pumps, and valves. This leads to high investment costs, a low cost-effectiveness when miniaturized, and virtually no recycling value afterward, as well as significant costs associated with dismantling.

[0004] Therefore, it is necessary to provide an integrated membrane bioreactor for dairy wastewater treatment to solve the above technical problems. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the existing technology such as high investment cost, low cost performance when miniaturized, basically no utilization value in later recovery, and high dismantling cost, the present invention provides an integrated membrane bioreactor treatment system for dairy wastewater treatment that is miniaturized, more cost-effective, can be recycled, and improves resource utilization.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: An integrated membrane bioreactor for treating dairy wastewater comprises a housing, wherein a first annular baffle, a second annular baffle, and a third annular baffle are fixed to the interior of the housing in sequence from the edge toward the center, dividing the interior of the housing into an anaerobic zone, an anoxic zone, an aerobic zone, and a sedimentation zone. The effective volume ratio of the anaerobic, anoxic, aerobic, and sedimentation zones is 2:3:4:1, and each zone is filled with fillers for attaching microorganisms. The sedimentation zone is located in the center of the housing and contains a membrane reactor. A plurality of first and second check valves are mounted on the third and second annular baffles, respectively. Pressure differentials between the sedimentation zone and the aerobic zone, and between the aerobic and anoxic zones, automatically cause water to flow from the aerobic zone to the sedimentation zone, and vice versa. The first annular baffle is mounted on multiple connecting pipes, connecting the anaerobic zone and the anoxic zone via the multiple connecting pipes. A cover plate is mounted on the top of the housing via screws, and is used to seal the anaerobic, anoxic, aerobic, and sedimentation zones.

[0007] Preferably, the first annular baffle is in the shape of an inverted funnel.

[0008] Preferably, the connecting pipe is arranged vertically or obliquely, passes through the first annular baffle, and its water outlet end in the anoxic zone is higher than its water inlet end in the anaerobic zone.

[0009] Preferably, a radar water level gauge is installed on the cover plate, and the radar water level gauge is used to detect the water level in the anoxic zone.

[0010] Preferably, a water suction pump is installed on the top of the cover plate, and a water suction pipe and a water outlet pipe are installed on the water suction pump. The water suction pipe extends into the aerobic zone, and the water outlet pipe extends into the anoxic zone.

[0011] Preferably, it also includes a mud discharge system, which includes a mud suction pipe with one end installed at the bottom of the box body, the mud suction pipe is connected to the sedimentation area, a mud suction pump is installed at a section of the mud suction pipe away from the box body, a mud discharge pipe is installed on the mud suction pump, and a connecting pipe is also installed on the mud discharge pipe, which is connected to the sewage inlet pipe installed on the box body, and gate valves are installed on both the mud discharge pipe and the connecting pipe.

[0012] Preferably, sewage pipes are installed at the bottom of the anaerobic zone, the anoxic zone and the aerobic zone, and gate valves are installed on the sewage pipes.

[0013] Preferably, it also includes a stirring system, which includes a first annular bag, a second annular bag, an air inlet pipe, a U-shaped tube and an exhaust pipe. The first annular bag is arranged in the anaerobic zone, and the second annular bag is arranged in the anoxic zone. The two ends of the U-shaped tube are respectively located in the anaerobic zone and the anoxic zone. The first annular bag and the second annular bag are respectively connected to the two ends of the U-shaped tube. The other end of the first annular bag is connected to the air inlet pipe, and the other end of the second annular bag is connected to the exhaust pipe. The air inlet pipe is connected to an air bag, and the air bag is connected to an air pump. An electromagnetic valve is also installed on the air inlet pipe.

[0014] Preferably, an aeration system is provided to supply oxygen to the aerobic zone. The inlet of the connecting air pipe is connected to the outlet of the exhaust pipe to collect the waste gas with residual pressure discharged from the agitation system. The outlet of the connecting air pipe is connected to the bottom end of the vertical air pipe, and the top end of the vertical air pipe is connected to the annular air pipe provided at the bottom of the aerobic zone.

[0015] Preferably, the connecting air pipe is a section of a conical diffuser pipe, a small end of which is connected to the vertical air pipe, and a large end of which is connected to the exhaust pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention integrates the process of multiple reinforced concrete tanks required by traditional A² / O-MBR into a ring box through an integrated ring layout and hydraulic gravity design, which reduces costs, makes the treatment system miniaturized, and has a higher cost-effectiveness. It can be recycled when not in use later, thereby improving resource utilization.

[0017] (2) The pulsed stirring system adopted in the present invention stirs the anaerobic and anoxic zones synchronously, effectively preventing sludge deposition. At the same time, the waste gas is introduced into the aerobic zone for aeration, achieving efficient energy recovery and utilization, and achieving outstanding energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the integrated membrane bioreactor for dairy wastewater treatment provided by the present invention; Figure 2 This is a schematic structural diagram of the integrated membrane bioreactor for dairy wastewater treatment provided by the present invention; Figure 3 for Figure 1 The schematic cross-sectional structure diagram of the integrated membrane bioreactor for dairy wastewater treatment is shown; Figure 4 for Figure 1 The schematic diagram of the front cross-sectional structure of the integrated membrane bioreactor for dairy wastewater treatment is shown; Figure 5 for Figure 1The diagram shows the structure of the stirring system and aeration system in the integrated membrane bioreactor for dairy wastewater treatment.

[0019] Among them, the names corresponding to the figure marks are: 1. box body; 2. first annular baffle; 3. second annular baffle; 4. third annular baffle; 5. anaerobic zone; 6. anoxic zone; 7. aerobic zone; 8. sedimentation zone; 9. membrane reactor; 10. first check valve; 11. second check valve; 12. connecting pipe; 13. radar water level gauge; 14. water suction pump; 15. sludge suction pipe; 16. sludge suction pump; 17. sludge discharge pipe; 18. connecting pipe; 19. sewage inlet pipe; 20. sewage discharge pipe; 21. first annular bag; 22. second annular bag; 23. air inlet pipe; 24. air bag; 25. U-shaped pipe; 26. exhaust pipe; 27. solenoid valve; 28. connecting air pipe; 29. ​​vertical air pipe; 30. aeration plate; 31. annular air pipe. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and examples. The embodiments of the present invention include but are not limited to the following examples. Example

[0021] like Figure 1-5The figure shows an integrated membrane bioreactor for treating dairy wastewater according to the present invention, comprising a housing 1, wherein a first annular baffle 2, a second annular baffle 3, and a third annular baffle 4 are fixed in sequence from the edge to the center of the housing 1, dividing the interior of the housing 1 into an anaerobic zone 5, an anoxic zone 6, an aerobic zone 7, and a sedimentation zone 8. The effective volume ratio of the anaerobic zone 5, the anoxic zone 6, the aerobic zone 7, and the sedimentation zone 8 is 2:3:4:1, and each zone is filled with fillers (not shown) for the attachment of microorganisms. The anaerobic zone 5 is filled with anaerobic fillers (elastic three-dimensional fillers) to provide a growth support for anaerobic phosphate-releasing bacteria and acidifying bacteria; the anoxic zone 6 is filled with anoxic fillers (combined fillers) to create an anoxic environment, attract denitrifying bacteria, and efficiently remove nitrate nitrogen; and the aerobic zone 7 is filled with aerobic fillers (suspended fillers or fixed fillers) to provide a site for attachment of nitrifying bacteria and aerobic heterotrophic bacteria, enhancing the removal of ammonia nitrogen and the degradation of organic matter. The sedimentation zone 8 is located at the center of the housing 1 and has a membrane reactor (MBR) 9 built in. The third annular baffle 4 and the second annular baffle 3 are respectively equipped with a plurality of first check valves 10 and second check valves 11 (the check valves may adopt the technical solution of patent number CN2289103Y, but are not limited thereto), so that the water in the aerobic zone 7 can only flow into the sedimentation zone 8 through the first check valve 10, and the water in the anaerobic zone 6 can only flow into the aerobic zone 7 through the second check valve 11. The pressure difference between the aerobic zone 7 and the anoxic zone 6 automatically causes water to flow from the aerobic zone 7 to the sedimentation zone 8, and from the anoxic zone 6 to the aerobic zone 7. A plurality of connecting pipes 12 are installed on the first annular baffle 2. The anaerobic zone 5 and the anoxic zone 6 are connected through a plurality of connecting pipes 12. The anaerobic zone 5 and the anoxic zone 6 are based on the communicating vessel principle to realize the flow of water from the anaerobic zone 5 to the anoxic zone 6. A cover plate is installed on the top of the box body 1 by a screw, and the cover plate is used to seal the anaerobic zone 5, the anoxic zone 6, the aerobic zone 7 and the sedimentation zone 8.

[0022] When in use, the outlet pipe of the membrane reactor 9 passes through the cover plate and is connected to the water pump. The water pump extracts the clean water filtered by the membrane reactor 9. The water in the sedimentation zone 8 is continuously filtered and transported away by the membrane reactor 9, and the water level inside it is gradually decreasing. When the water level in the sedimentation zone 8 drops to a certain position, the water levels in the aerobic zone 7 and the sedimentation zone 8 reach a certain drop. Under the action of the pressure difference, the water in the aerobic zone 7 opens the first check valve 10 and flows into the sedimentation zone 8 through the first check valve 10. When the water level difference between the aerobic zone 7 and the sedimentation zone 8 reaches equilibrium, the first check valve 10 is closed, thereby cutting off the water flow. After the water in the aerobic zone 7 flows by gravity for many times, the water level in the aerobic zone 7 drops to a specified position and there is a large drop from the position of the anoxic zone 6. At this time, the water in the anoxic zone 6 automatically opens the second check valve 11 and enters the aerobic zone 7 through the check valve 11 to replenish the water in the aerobic zone 7. Similarly, after many times of gravity flow, the water level in the anoxic zone 6 will also drop to a certain height. When the water level in the anoxic zone 6 drops to a certain height, it is necessary to promptly replenish sewage into the anaerobic zone 5, so that the sewage in the anaerobic zone 5 rises to a position higher than the connecting pipe 12, and then the sewage in the anaerobic zone 5 flows into the anoxic zone 6, thereby replenishing the water in the anoxic zone 6.

[0023] This embodiment integrates the traditional process that requires multiple reinforced concrete tanks into an annular box, which reduces costs, makes the treatment system miniaturized, and has a higher cost-effectiveness. If not used later, it can be recycled, thereby improving resource utilization. Example

[0024] like Figure 4 As shown, the first annular baffle 2 is in an inverted funnel shape, so that the water surface area of ​​the anoxic zone 6 gradually decreases from top to bottom. In this way, when the water in the anoxic zone 6 flows to the aerobic zone 7, the water level drops to a certain height, and as much water as possible can flow into the aerobic zone 7; at the same time, the water surface area of ​​the anaerobic zone 5 is gradually reduced from top to bottom. In this way, when a small amount of fresh sewage enters the anaerobic zone 5, it can reach a relatively high height, thereby allowing more treated sewage to enter the anoxic zone 6. Example

[0025] like Figure 4 As shown, the connecting pipe 12 is arranged vertically or obliquely, and passes through the first annular baffle 2. The water outlet end thereof in the anoxic zone 6 is higher than the water inlet end in the anaerobic zone 5. When the water level in the anaerobic zone 5 does not need to flow to the anoxic zone 6, the water level in the anaerobic zone 5 is kept consistent with the height of the water outlet end of the connecting pipe 12, and the water in the anoxic zone 6 will flow into a part of the aerobic zone 7 under the action of the water level difference, so that the water level in the anoxic zone 6 will be lower than the height of the connecting pipe 12. In this state, the water in the connecting pipe 12 actually achieves a water seal effect on the anaerobic zone 5. Example

[0026] like Figure 4 As shown, a radar water level gauge 13 is installed on the cover plate 2. The radar water level gauge 13 is used to detect the water level of the anoxic zone 6. When the water level of the anoxic zone 6 is too low, external sewage will enter the anaerobic zone 5 to increase the water level of the anaerobic zone 5. When the water level is higher than the height of the connecting pipe 12, the water inside the anaerobic zone 5 will enter the anoxic zone 6 through the connecting pipe 12 to replenish the water in the anaerobic zone 6. Example

[0027] like Figure 4 As shown, a water suction pump 14 is installed on the top of the cover plate, and a water suction pipe and a water outlet pipe are installed on the water suction pump 14. The water suction pipe extends into the aerobic zone 7, and the water outlet pipe extends into the anoxic zone 6. When the water suction pump 14 is started, the water in the aerobic zone 7 will be transported to the anoxic zone 6.

[0028] After the water suction pump 14 is started, it actively transports the mixed liquid rich in nitrate nitrogen in the aerobic zone 7 to the anoxic zone 6, providing sufficient electron acceptors for the denitrifying bacteria and enhancing the denitrification efficiency of the system. When the concentration of organic matter in the influent is low (insufficient carbon source), the mixed liquid in the aerobic zone 7 flows back to the anoxic zone 6 to supplement a portion of the carbon source and maintain the smooth progress of denitrification. The start and stop and operating time of the water suction pump 14 can be automatically controlled by a time controller or in conjunction with a nitrate probe (not shown) installed in the anoxic zone 6. Example

[0029] like Figure 4 As shown, it also includes a mud discharge system, which includes a mud suction pipe 15 with one end installed at the bottom of the box body 1, the mud suction pipe 15 is connected to the sedimentation area 8, and a mud suction pump 16 is installed at a section of the mud suction pipe 15 away from the box body 1, and a mud discharge pipe 17 is installed on the mud suction pump 16. A connecting pipe 18 is also installed on the mud discharge pipe 17, and the connecting pipe 18 is connected to a sewage inlet pipe 19 installed on the box body 1. Gate valves are installed on both the mud discharge pipe 17 and the connecting pipe 18.

[0030] When there is a lot of sediment in the sedimentation zone 8, the sludge suction pump 16 is started. At this time, the gate valve on the connecting pipe 18 is in a closed state, and the gate valve on the sludge discharge pipe 17 is in an open state, so that the sludge in the sedimentation zone 8 can be discharged; and when the concentration of activated sludge (microorganisms) in the anaerobic zone needs to be supplemented, the gate valve on the connecting pipe 18 needs to be opened, and the gate valve on the sludge discharge pipe 17 needs to be closed at the same time, so that the sludge is mixed with the sewage in the water inlet pipe 19 and enters the anaerobic zone 5 to supplement the amount of activated sludge in the anaerobic zone 5 and maintain its high biological activity and treatment efficiency. Example

[0031] like Figure 4As shown, sewage pipes 20 are installed at the bottom of the anaerobic zone 5, the anoxic zone 6 and the aerobic zone 7. Gate valves are installed on the sewage pipes 20. Impurities or water at the bottom of the anaerobic zone 5, the anoxic zone 6 and the aerobic zone 7 can be discharged by opening the gate valves on the sewage pipes 20.

[0032] The purpose of this embodiment is to completely drain the liquid and sludge in each functional area through the sewage pipe 20 when the equipment requires internal maintenance or long-term outage. During operation, inorganic particulate matter and impurities with larger specific gravity contained in the wastewater will settle at the bottom of each area. Regularly opening the gate valve on the sewage pipe 20 can discharge these accumulated sediments out of the system to prevent them from occupying the effective volume or clogging the pipeline, thereby ensuring the long-term stable operation of the reactor. In special circumstances, it is used to quickly adjust the sludge concentration in the anaerobic zone, anoxic zone, and aerobic zone. Example

[0033] like Figure 3-5 As shown, the apparatus further includes an agitation system comprising a first annular bag 21, a second annular bag 22, an air inlet pipe 23, a U-shaped pipe 25, and an exhaust pipe 26. The first annular bag 21 is disposed in the anaerobic zone 5, and the second annular bag 22 is disposed in the anoxic zone 6. The ends of the U-shaped pipe 25 are located in the anaerobic zone 5 and the anoxic zone 6, respectively. The first annular bag 21 and the second annular bag 22 are connected to the ends of the U-shaped pipe 25, respectively. The other end of the first annular bag 21 is connected to the air inlet pipe 23, and the other end of the second annular bag 22 is connected to the exhaust pipe 26. The air inlet pipe 23 is connected to an air bag 24, which is connected to an air pump. A solenoid valve 27 is also installed on the air inlet pipe 27. During use, the air pump is started to inflate the air bag 24 to ensure that the sewage and sludge in the anaerobic and anoxic zones are fully mixed, prevent sludge sedimentation, and enhance mass transfer efficiency. When the air pressure in the air bag 24 reaches a certain value, the solenoid valve 27 opens instantly, then quickly closes after 2-3 seconds, then waits another 2-3 seconds before opening again, repeating this process. During this process, when the solenoid valve 27 opens, the high-pressure air in the air bag 24 quickly enters the first annular bag 21 through the air inlet pipe 23, causing the first annular bag 21 to rapidly expand. When the solenoid valve 27 closes, the air pressure inside the first annular bag 21 reaches equilibrium with the second annular bag 22 through the U-shaped tube 25, and the bag then retracts.

[0034] As solenoid valve 27 repeatedly opens and closes, high-pressure air pulses into first annular bag 21, driving the synchronous and repeated expansion and contraction of first and second annular bags 21, 22. This action creates a strong, pulsed impact on the water in anaerobic zone 5 and anoxic zone 6, causing the water in both zones to experience intense oscillation and turbulence, thus achieving uniform mixing throughout the tank without the need for mechanical agitation.

[0035] The pulsed stirring energy of this embodiment is concentrated, which can produce strong turbulence. The mixing effect is better than that of traditional slow mechanical stirring, and sludge deposition is effectively prevented. A pneumatic system drives the first annular bag 21 and the second annular bag at the same time. The system structure is simple and compact, low cost and easy to control. Example

[0036] like Figure 5 As shown, this embodiment, based on Example 8, includes an aeration system for supplying oxygen to the aerobic zone 7. The inlet of the connecting air pipe 28 is connected to the outlet of the exhaust pipe 26 to collect the waste gas with residual pressure discharged from the agitation system. The outlet of the connecting air pipe 28 is connected to the bottom end of a vertical air pipe 29, and the top end of the vertical air pipe 29 is connected to an annular air pipe 31 provided at the bottom of the aerobic zone 7.

[0037] When the agitation system is operating, the pressurized gas it discharges flows sequentially through exhaust pipe 26, connecting air pipe 28, vertical air pipe 29, and annular air pipe 31, ultimately being released into aerobic zone 7 in the form of microbubbles through multiple aeration discs 30. This gas not only provides essential oxygen for aerobic microorganisms but also fully utilizes its own kinetic energy and pressure, achieving efficient energy recovery.

[0038] Furthermore, the connecting air pipe 28 is a section of a tapered diffuser pipe, the small end of which is connected to the vertical air pipe 29, and the large end of which is connected to the exhaust pipe 26. This design can increase the gas pressure and enhance the aeration effect.

[0039] Working Principle: Dairy wastewater first enters the anaerobic zone 5 through the inlet pipe 19, where it undergoes hydrolysis, acidification, and phosphorus release under the action of anaerobic microorganisms. Subsequently, the wastewater enters the anoxic zone 6 through the connecting pipe 12 on the first annular baffle 2, where it mixes with the nitrate-containing mixed solution returned from the aerobic zone 7 and undergoes denitrification and denitrification under the action of denitrifying bacteria.

[0040] Driven by the water level difference between the aerobic zone 7 and the anoxic zone 6, the treated wastewater enters the aerobic zone 7 through the second check valve 11. Aerobic microorganisms degrade organic matter and initiate nitrification. Driven by the liquid level difference created by the membrane reactor 9's suction pump, the mixed liquid from the aerobic zone 7 flows through the first check valve 10 into the central sedimentation zone 8. The membrane reactor 9 performs solid-liquid separation, and the filtered water is pumped out of the system by the suction pump, while the activated sludge is retained.

[0041] The sludge in the sedimentation zone 8 is transported by the sludge suction pump 16 through the sludge suction pipe 15. Part of it is discharged as residual sludge through the sludge discharge pipe 17, and the other part is mixed with the influent through the connecting pipe 18 and sent back to the anaerobic zone 5 as return sludge to maintain the system biomass.

[0042] Throughout the entire process, the pulse stirring system consisting of the air bag 24, the solenoid valve 27, the first annular bag 21, the U-shaped tube 25, and the second annular bag 22 mixes the anaerobic zone 5 and the anoxic zone 6. The waste gas discharged from the stirring system through the exhaust pipe 26 is transported to the aerobic zone 7 through the connecting air pipe 28, the vertical air pipe 29 and the annular air pipe 31, and aerated through the aeration disk 30, thereby achieving full energy utilization.

Claims

1. An integrated membrane bioreactor for dairy wastewater treatment, characterized in that: include: A box body (1), wherein a first annular baffle (2), a second annular baffle (3) and a third annular baffle (4) are fixed in sequence from the edge to the center of the box body (1), and the interior of the box body (1) is divided into an anaerobic zone (5), an anoxic zone (6), an aerobic zone (7) and a sedimentation zone (8); The precipitation zone (8) is located at the center of the box (1) and has a membrane reactor (9) built in; The third annular baffle (4) is provided with a first check valve (10) that allows the mixed liquid to flow from the aerobic zone (7) into the sedimentation zone (8) in one direction; the second annular baffle (3) is provided with a second check valve (11) that allows the mixed liquid to flow from the anoxic zone (6) into the aerobic zone (7) in one direction; The first annular baffle (2) is provided with a connecting pipe (12) for connecting the anaerobic zone (5) with the anoxic zone (6).

2. The integrated membrane bioreactor for dairy wastewater treatment according to claim 1, characterized in that: The first annular baffle (2) is in the shape of an inverted funnel.

3. An integrated membrane bioreactor for dairy wastewater treatment according to claim 1 or 2, characterized in that: The connecting pipe (12) is arranged vertically or obliquely, and its water outlet end located in the anoxic zone (6) is higher than its water inlet end located in the anaerobic zone (5).

4. The integrated membrane bioreactor for dairy wastewater treatment according to claim 1, characterized in that: It also includes a radar water level meter (13) installed on the cover plate, and the radar water level meter (13) is used to detect the water level of the anoxic zone (6).

5. The integrated membrane bioreactor for dairy wastewater treatment according to claim 1, characterized in that: It also includes a water suction pump (14) installed on the cover plate, wherein the water suction pipe of the water suction pump (14) extends into the aerobic zone (7) and the water outlet pipe extends into the anoxic zone (6).

6. The integrated membrane bioreactor for dairy wastewater treatment according to claim 1, characterized in that: The invention also includes a mud discharge system, which includes a mud suction pipe (15) connected to the sedimentation area (8), a mud suction pump (16) connected to the mud suction pipe (15), a mud discharge pipe (17) connected to the outlet of the mud suction pump (16), and a connecting pipe (18), wherein the connecting pipe (18) is connected to the sewage inlet pipe (19), and gate valves are provided on the mud discharge pipe (17) and the connecting pipe (18).

7. The integrated membrane bioreactor for dairy wastewater treatment according to claim 1, characterized in that: A sewage pipe (20) with a gate valve is provided at the bottom of each of the anaerobic zone (5), the anoxic zone (6) and the aerobic zone (7).

8. The integrated membrane bioreactor for dairy wastewater treatment according to claim 1, characterized in that: The invention also includes a stirring system, which includes a first annular bag (21) arranged in the anaerobic zone (5), a second annular bag (22) arranged in the anoxic zone (6), and an air circuit connecting the two bags through a U-shaped tube (25); the air circuit also includes an air inlet pipe (23) connected to the first annular bag (21), an exhaust pipe (26) connected to the second annular bag (22), an air bag (24) and an air pump providing an air source for the air inlet pipe (23), and a solenoid valve (27) for controlling the on / off of the air circuit.

9. The integrated membrane bioreactor for dairy wastewater treatment according to claim 8, characterized in that: The aeration system further comprises a connecting air pipe (28) connected to the outlet of the exhaust pipe (26), a vertical air pipe (29) connected to the connecting air pipe (28), and an annular air pipe (31) connected to the vertical air pipe (29) and arranged at the bottom of the aerobic zone (7), wherein a plurality of aeration plates (30) are provided on the annular air pipe (31).

10. The integrated membrane bioreactor for dairy wastewater treatment according to claim 9, characterized in that: The connecting air pipe (28) is a tapered expansion pipe, the large end of which is connected to the exhaust pipe (26), and the small end of which is connected to the vertical air pipe (29).

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