Small-sized integrated sewage treatment device and treatment method

Abstract

The application discloses a small integrated sewage treatment device and treatment method, relates to the technical field of sewage treatment, and comprises a mechanical grid, a membrane assembly body and a blower, a communication adjusting pool is arranged on the water outlet side of the mechanical grid, an adjusting pool lifting pump is arranged in the adjusting pool, the adjusting pool lifting pump is communicated with an anoxic pool, a self-cleaning filter chamber is arranged between the anoxic pool and a membrane biological reaction pool, a water inlet of the self-cleaning filter chamber is communicated with the anoxic pool, a water outlet of the self-cleaning filter chamber is communicated with the membrane biological reaction pool, a lifting isolation gate plate is slidably arranged on one side of the water inlet of the self-cleaning filter chamber, a wedge-shaped filter screen is arranged in the self-cleaning filter chamber, and a conical sludge collecting hopper is arranged below the wedge-shaped filter screen. The small integrated sewage treatment device and treatment method are adopted, the self-cleaning filter module is isolated, the filter screen blowing and sludge discharging can be completed without stopping the whole machine, the pollution rate of the membrane assembly is reduced, meanwhile, the active sludge floc is allowed to pass through, and the sludge balance of the biochemical system is maintained.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a small integrated wastewater treatment device and treatment method. Background Technology

[0002] In actual operation, domestic sewage carries hair, fibers, debris, scum, and sludge aggregates. These impurities easily adhere to and entangle on the surface of the hollow fiber membrane filaments after entering the membrane bioreactor, causing membrane fouling, pore blockage, and a rapid decline in membrane flux. To restore treatment capacity, frequent offline chemical cleaning is required, which not only increases the costs of chemicals and labor maintenance but also shortens the actual service life of the membrane modules.

[0003] In existing technologies, some small-scale equipment uses simple grilles or filters at the front end to intercept large particles of debris. However, most existing filters lack independent cleaning units. When debris accumulates and clogs the filter, the entire machine usually needs to be shut down to remove and clean it, causing an interruption in wastewater treatment. If the equipment is kept running continuously, the material trapped on the filter continues to accumulate, the head loss increases rapidly, and the treated water volume decreases. At the same time, ordinary filters cannot effectively intercept large impurities while allowing activated sludge flocs to pass through, easily intercepting normal activated sludge, causing sludge loss from the biological system, disrupting the sludge concentration balance in the system, and directly leading to poor denitrification in the anoxic tank and excessive total nitrogen levels in the effluent. Summary of the Invention

[0004] The purpose of this invention is to provide a small-scale integrated sewage treatment device and method that enables online isolation, purging, and sludge removal of the filter screen, ensures normal circulation of activated sludge, stabilizes the denitrification performance of the system, and is suitable for long-term continuous sewage treatment.

[0005] This invention provides a small-scale integrated wastewater treatment device, including a mechanical bar screen, a membrane module body, and a blower. The effluent side of the mechanical bar screen is connected to an equalization tank. An equalization tank lift pump is installed inside the equalization tank, which is connected to an anoxic tank. A self-cleaning filter chamber is provided between the anoxic tank and the membrane bioreactor. The inlet of the self-cleaning filter chamber is connected to the anoxic tank, and the outlet of the self-cleaning filter chamber is connected to the membrane bioreactor. A lifting isolation gate is slidably installed on one side of the inlet of the self-cleaning filter chamber. A wedge-shaped filter screen is arranged inside the self-cleaning filter chamber. A conical sludge collection hopper is set below the wedge-shaped filter screen. A reverse aeration purge pipe is arranged on the back surface of the wedge-shaped filter screen. The bottom of the conical sludge collection hopper is connected to a sludge discharge branch pipe, which is connected to a sludge tank. The membrane module body is installed inside the membrane bioreactor.

[0006] Preferably, the membrane module water collection main pipe in the membrane module body is connected to the product water pipeline, the product water pipeline is connected to the greywater clear water tank, the blower output end is connected to the aeration pipe main pipe, and the aeration pipe main pipe is connected to the bottom aeration and air distribution component and the reverse aeration and purging pipe in the membrane module body respectively.

[0007] Preferably, the membrane module body includes a membrane frame, hollow fiber membrane filaments, membrane filament ends, a membrane module water collection main pipe and an aeration guide plate. The hollow fiber membrane filaments are sealed and fixed through the casting end. The inner cavity of the hollow fiber membrane filaments is connected to the membrane module water collection main pipe. The aeration guide plate is fixed to the lower part of the membrane frame and located below the hollow fiber membrane filaments. The bottom aeration distribution component is arranged below the aeration guide plate.

[0008] Preferably, the lifting isolation gate is slidably installed in the vertical direction. The lifting isolation gate slides downward to block the water inlet of the self-cleaning filter chamber, and slides upward to open the water inlet channel.

[0009] Preferably, the reverse aeration purge pipe is provided with purge holes facing the wedge-shaped filter screen.

[0010] Preferably, the water production pipeline is equipped with a vacuum gauge, a vacuum self-priming pump, a regulating valve, and a flow meter in sequence along the water production flow direction.

[0011] Preferably, the system also includes a nitrification liquor return submersible pump and a waste sludge submersible pump. The nitrification liquor return submersible pump is located inside the membrane bioreactor and is connected to a nitrification liquor return pipeline. The other end of the nitrification liquor return pipeline is connected to an anoxic tank. The waste sludge submersible pump is located inside the membrane bioreactor and is connected to a sludge discharge pipeline, which leads to a sludge tank. Wedge-shaped filter screens are arranged obliquely inside the self-cleaning filter chamber, and the bottom of the conical sludge collection hopper narrows downwards.

[0012] A treatment method for a small integrated wastewater treatment device includes the following steps: Step S1: After large particulate impurities are removed by mechanical screen, the wastewater enters the equalization tank. The equalization tank lift pump transports the wastewater in the equalization tank to the anoxic tank for denitrification. Step S2: Lift the isolation gate to open, and the effluent from the anoxic tank flows into the self-cleaning filter chamber. The sewage is filtered through the wedge-shaped filter screen, and fibers, large pieces of scum and aggregated sludge are intercepted. Normal activated sludge flocs pass through the wedge-shaped filter screen and enter the membrane bioreactor. The intercepted impurities fall into the conical sludge collection hopper by their own weight. Step S3: In the membrane bioreactor, the blower aerates the water through the bottom aeration and air distribution components and the vacuum self-priming pump draws the water. The hollow fiber membrane fibers complete the solid-liquid separation. The permeate is transported to the greywater clear water tank through the membrane module water collection main pipe and the permeate pipeline. The nitrification liquid return submersible pump returns the nitrification mixture in the membrane bioreactor to the anoxic tank. The remaining sludge submersible pump periodically discharges the remaining sludge in the membrane bioreactor into the sludge tank. Step S4: Close the lifting isolation gate to isolate the self-cleaning filter chamber, open the reverse aeration purging pipe to perform reverse aeration purging on the back surface of the wedge filter screen, and after purging, open the sludge discharge branch pipe. The debris trapped in the conical sludge collection hopper is discharged into the sludge tank. After the sludge discharge is completed, close the sludge discharge branch pipe, reopen the lifting isolation gate, and restore normal filtration.

[0013] Therefore, the present invention employs the above-mentioned small integrated sewage treatment device and treatment method to achieve online isolation, sludge removal and purging of the filter screen, ensure normal circulation of activated sludge, stabilize the denitrification performance of the system, and adapt to long-term continuous sewage treatment.

[0014] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a small integrated sewage treatment device according to the present invention; Figure 2 This is a schematic diagram of the structure of the self-cleaning filter chamber in a small integrated sewage treatment device of the present invention; Figure 3 This is a schematic diagram of the structure of the membrane module body in a small integrated wastewater treatment device of the present invention; Figure 4 This is a schematic diagram of the treatment method of a small integrated sewage treatment device according to the present invention.

[0016] Figure Labels 1. Mechanical bar screen; 2. Equalization tank; 3. Equalization tank lift pump; 4. Anoxic tank; 5. Membrane bioreactor; 6. Membrane frame; 7. Hollow fiber membrane filaments; 8. Casting end; 9. Membrane module main water collection pipe; 10. Aeration guide plate; 11. Blower; 12. Aeration main pipeline; 13. Bottom aeration distribution assembly; 14. Vacuum gauge; 15. Vacuum self-priming pump; 16. Control valve; 17. Flow meter; 18. Sludge tank; 19. Waste sludge submersible pump; 20. Reclaimed water tank; 21. Permeate pipeline; 22. Self-cleaning filter chamber; 23. Wedge filter screen; 24. Conical sludge collection hopper; 25. Reverse aeration purge pipe; 26. Lift isolation gate; 27. Nitrification liquor return submersible pump; 28. Nitrification liquor return pipeline; 29. ​​Sludge discharge pipeline; 30. Sludge discharge branch pipe. Detailed Implementation

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0019] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1 like Figures 1-4 As shown, this invention discloses a small-scale integrated wastewater treatment device, comprising a mechanical bar screen 1, a membrane module body, and a blower 11. The effluent side of the mechanical bar screen 1 is connected to an equalization tank 2, and an equalization tank lift pump 3 is installed inside the equalization tank 2. The effluent pipeline of the equalization tank lift pump 3 is connected to an anoxic tank 4. Wastewater, after being intercepted by large particulate impurities by the mechanical bar screen 1, flows into the equalization tank 2, where the water quality and quantity are balanced. Then, the equalization tank lift pump 3 steadily pumps the wastewater into the anoxic tank 4, effectively avoiding the impact of fluctuations in influent water quality and quantity on subsequent biological treatment and ensuring the operational stability of the entire equipment.

[0021] A self-cleaning filter chamber 22 is installed between the anoxic tank 4 and the membrane bioreactor 5. The inlet of the self-cleaning filter chamber 22 is connected to the anoxic tank 4, and the outlet of the self-cleaning filter chamber 22 is connected to the membrane bioreactor 5. This realizes a graded treatment mode in which the anoxic biochemical effluent is filtered first and then enters the membrane bioreactor 5. This intercepts large particulate impurities, large sludge clumps and suspended scum in the sewage in advance, protects the downstream membrane module body from the source, greatly reduces the fouling rate and extends the service life.

[0022] A lifting isolation gate 26 is slidably mounted on one side of the inlet of the self-cleaning filter chamber 22. The lifting isolation gate 26 is slidably set in the vertical direction. An electric push rod drive structure is mounted on the top of the lifting isolation gate 26. The electric push rod is vertically fixed to the top of the self-cleaning filter chamber 22. The bottom end of the telescopic rod of the electric push rod is rigidly connected to the lifting isolation gate 26. The lifting isolation gate 26 is raised and lowered vertically by the extension and retraction of the electric push rod. It can realize automatic vertical raising and lowering. The lifting isolation gate 26 slides down to block the inlet of the self-cleaning filter chamber 22, and slides up to open the water inlet channel. The self-cleaning filter chamber 22 can be isolated by the openable and closable lifting isolation gate 26, so that the cleaning operation of the wedge filter screen 23 can be carried out independently without stopping the entire equipment, realizing continuous and uninterrupted sewage treatment and effectively improving the operating efficiency of the equipment.

[0023] Inside the self-cleaning filter chamber 22, a wedge-shaped filter screen 23 is arranged at an angle. The wedge-shaped filter screen 23 is embedded with annular rubber sealing strips around its four edges. The wedge-shaped filter screen 23 is pressed and fixed in the mounting groove inside the self-cleaning filter chamber 22. The rubber sealing strips fit the gaps in the chamber wall of the self-cleaning filter chamber 22 to achieve a full circumference seal, completely eliminating the problem of water flowing directly to the rear end through the side gaps of the wedge-shaped filter screen 23. This ensures that all sewage must be filtered through the filter surface of the wedge-shaped filter screen 23.

[0024] A sealing structure is installed between the edge of the wedge-shaped filter screen 23 and the wall of the self-cleaning filter chamber 22 to completely seal the gaps, preventing water from short-circuiting and flowing directly into the downstream membrane bioreactor 5 without being filtered by the wedge-shaped filter screen 23, thus ensuring filtration effectiveness. The inclined structure allows the trapped impurities to slide off automatically by their own weight, making it less likely to accumulate and clog the surface of the wedge-shaped filter screen 23. Compared with the horizontally arranged wedge-shaped filter screen 23, it has stronger self-cleaning ability and better filtration stability. The filter slot size of the wedge-shaped filter screen 23 is adapted to the operating conditions of the biological system, intercepting only fibrous impurities, large pieces of floating scum, and agglomerated sludge, while allowing normal activated sludge flocs to flow smoothly into the membrane bioreactor 5, completely avoiding the loss of activated sludge in the biological system and ensuring the continuous and stable operation of anoxic denitrification and the biochemical reaction in the membrane tank.

[0025] A conical sludge collection hopper 24 is installed below the wedge-shaped filter screen 23, with the bottom of the hopper narrowing downwards. This allows for the centralized collection of sliding impurities and sludge, preventing them from scattering and accumulating. The structure provides excellent sludge collection and eliminates dead zones. A reverse aeration blowpipe 25 is arranged on the backwater side of the wedge-shaped filter screen 23, and the reverse aeration blowpipe 25 has blowholes facing the wedge-shaped filter screen 23.

[0026] The bottom of the conical sludge hopper 24 is connected to the sludge discharge branch pipe 30. A normally open electromagnetic sludge discharge valve is installed on the sludge discharge branch pipe 30. Under normal filtration conditions, the electromagnetic sludge discharge valve is closed and sealed to prevent water loss. Under sludge cleaning conditions, the electromagnetic sludge discharge valve opens periodically to achieve intermittent automatic sludge discharge. The electromagnetic sludge discharge valve installed on the sludge discharge branch pipe 30 achieves timed and intermittent sludge discharge through electrical control. Under normal filtration conditions, the valve is closed to prevent water loss. When cleaning sludge, the valve opens to discharge sludge, which can achieve intermittent and controllable sludge discharge and avoid water loss and equipment failure to store and filter water normally due to normally open sludge discharge.

[0027] The sludge discharge branch pipe 30 connects to the sludge tank 18, allowing the filtered and intercepted impurities and sludge to be uniformly discharged into the sludge tank 18 for storage, thus achieving wastewater diversion and centralized treatment of impurities. The membrane module body is installed inside the membrane bioreactor 5, and the membrane module water collection main pipe 9 in the membrane module body connects to the permeate pipe 21, which in turn connects to the greywater clear water tank 20.

[0028] The blower 11 output is connected to the main aeration pipe 12, which in turn connects to the bottom aeration distribution component 13 and the reverse aeration purge pipe 25 within the membrane module body. A separate electromagnetic vent valve is installed on each branch of the reverse aeration purge pipe 25. During normal filtration operation, the electromagnetic vent valve is closed, cutting off the purge air path to prevent continuous air jetting from disturbing the pre-filter water flow and affecting the filtration efficiency. During filter cleaning, the electromagnetic vent valve is opened, connecting compressed air to complete the reverse purging.

[0029] The membrane module body includes a membrane frame 6, hollow fiber membrane fibers 7, membrane fiber ends 8, a membrane module water collection manifold 9, and an aeration guide plate 10. The hollow fiber membrane fibers 7 are sealed and fixed by the casting ends 8, ensuring a tight seal and preventing short-circuit leakage of wastewater, thus guaranteeing the accuracy of solid-liquid separation. The inner cavity of the hollow fiber membrane fibers 7 is connected to the membrane module water collection manifold 9. The aeration guide plate 10 is fixed to the lower part of the membrane frame 6 and located below the hollow fiber membrane fibers 7. The bottom aeration distribution assembly 13 is arranged below the aeration guide plate 10. The rising airflow produced by the bottom aeration distribution assembly 13 is guided and regulated by the aeration guide plate 10, causing the airflow to rise evenly along the surface of the hollow fiber membrane fibers 7, comprehensively flushing the surface of the membrane fibers, effectively inhibiting sludge adhesion on the membrane fiber surface, delaying membrane pore clogging, and continuously ensuring membrane filtration flux and effluent water quality.

[0030] The lifting isolation gate 26 is slidably installed in the vertical direction. The lifting isolation gate 26 slides downward to block the water inlet of the self-cleaning filter chamber 22, and the lifting isolation gate 26 slides upward to open the water inlet channel.

[0031] The permeate pipeline 21 is sequentially equipped with a vacuum gauge 14, a vacuum self-priming pump 15, a regulating valve 16, and a flow meter 17 along the permeate flow direction. The vacuum self-priming pump 15 provides stable negative pressure suction power for the membrane filtration permeate. The vacuum gauge 14 monitors the negative pressure status of the pipeline in real time, and can promptly predict faults such as membrane fiber blockage and pipeline leakage. The regulating valve 16 can precisely adjust the permeate flow rate to adapt to different inlet water loads. The flow meter 17 measures the permeate volume in real time, facilitating equipment operation data statistics and operating condition control. The cooperation of multiple components ensures a stable, controllable, and monitorable permeate process, guaranteeing uniform and compliant effluent quality.

[0032] The system also includes a nitrification liquor return submersible pump 27 and a waste sludge submersible pump 19. The nitrification liquor return submersible pump 27 is located within the membrane bioreactor 5 and is connected to a nitrification liquor return pipeline 28, the other end of which is connected to an anoxic tank 4. The waste sludge submersible pump 19 is located inside the membrane bioreactor 5. By returning the nitrate-rich nitrogen-rich mixed liquor from the membrane tank to the anoxic tank 4, it provides sufficient reaction substrate for the denitrification reaction, significantly improving the total nitrogen removal efficiency of the wastewater and enhancing the denitrification performance of the equipment. The waste sludge submersible pump 19 is connected to a sludge discharge pipeline 29, which leads to a sludge tank 18. Excess activated sludge proliferating in the bioreactor 5 can be periodically discharged into the sludge tank 18 to maintain a stable sludge concentration within the membrane bioreactor 5 and prevent excessive sludge accumulation from affecting the biochemical reaction and membrane filtration efficiency.

[0033] A treatment method for a small integrated wastewater treatment device includes the following steps: Step S1: After large particulate impurities are removed by mechanical screen 1, the wastewater enters equalization tank 2. The equalization tank lift pump 3 transports the wastewater in equalization tank 2 to anoxic tank 4 for denitrification.

[0034] Step S2: The isolation gate 26 is opened, and the effluent from the anoxic tank 4 flows into the self-cleaning filter chamber 22. The sewage is filtered through the wedge-shaped filter screen 23, and fibers, large pieces of scum and aggregated sludge are intercepted. Normal activated sludge flocs pass through the wedge-shaped filter screen 23 and enter the membrane bioreactor 5. The intercepted impurities fall into the conical sludge collection hopper 24 by their own weight.

[0035] In step S3, within the membrane bioreactor 5, the blower 11 aerates the water through the bottom aeration and air distribution component 13 and draws it in with the vacuum self-priming pump 15. The hollow fiber membrane filaments 7 complete solid-liquid separation. The permeate is transported to the greywater clear water tank 20 through the membrane module water collection main pipe 9 and the permeate pipeline 21. The nitrification liquor return submersible pump 27 returns the nitrification mixture in the membrane bioreactor 5 to the anoxic tank 4. The remaining sludge submersible pump 19 periodically discharges the remaining sludge in the membrane bioreactor 5 into the sludge tank 18.

[0036] Step S4: Close the lifting isolation gate 26 to isolate the self-cleaning filter chamber 22, and open the reverse aeration purge pipe 25 to perform reverse aeration purge on the back surface of the wedge filter screen 23. After purging, open the sludge discharge branch pipe 30, and discharge the debris trapped in the conical sludge collection hopper 24 into the sludge tank 18. After sludge discharge, close the sludge discharge branch pipe 30, reopen the lifting isolation gate 26, and restore normal filtration.

[0037] Under normal filtration conditions, the electric push rod drives the isolation gate 26 to remain open, allowing normal water intake filtration in the self-cleaning filter chamber 22. The wedge-shaped filter screen 23 achieves full circumferential sealing thanks to the annular rubber sealing strips embedded around its perimeter, preventing short-circuiting of the water flow and ensuring filtration accuracy. Simultaneously, the inclined structure allows trapped debris to automatically slide down and collect inside the conical sludge collection hopper 24, and the filter slot size ensures smooth passage of activated sludge, preventing sludge loss from the biological system. The blower 11 continuously supplies air to the bottom aeration distribution assembly 13 through the main aeration pipe 12. The airflow is evenly guided by the aeration guide plate 10 to wash the surface of the hollow fiber membrane filaments 7, delaying membrane fouling. The permeate pipeline 21, through the coordinated operation of the vacuum gauge 14, regulating valve 16, and flow meter 17, achieves negative pressure monitoring, flow regulation, and water metering, ensuring stable permeate quality. The nitrification liquor recirculation and timed discharge of excess sludge stabilize the system's biochemical concentration and denitrification efficiency.

[0038] When the wedge filter screen 23 becomes clogged and needs cleaning, the electric push rod drives the lifting isolation gate 26 to fall and close the inlet, achieving single-compartment isolation. Then, the electromagnetic vent valve on the air circuit of the reverse aeration purge pipe 25 is opened to perform intermittent reverse aeration purge, removing the contaminants attached to the wedge filter screen 23. After purging, the electromagnetic sludge discharge valve on the sludge discharge branch pipe 30 is opened to discharge the sludge accumulated in the sludge hopper. After sludge discharge, the valve is closed, and the lifting isolation gate 26 is reset. The equipment quickly resumes continuous water purification operation without requiring a complete shutdown, resulting in high operating efficiency and low maintenance costs.

[0039] Therefore, the present invention adopts the above-mentioned small integrated sewage treatment device and treatment method, which is equipped with an isolable self-cleaning filter module. The filter screen can be purged and sludge discharged without the entire machine being shut down, effectively intercepting fiber scum and reducing the fouling rate of the membrane module. At the same time, it allows activated sludge flocs to pass through, maintains the sludge balance of the biological system, improves the total nitrogen removal effect, reduces the frequency of operation and maintenance, and extends the service life of the membrane module.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention; and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A small-scale integrated sewage treatment device, characterized in that, The system includes a mechanical bar screen, a membrane module body, and a blower. The effluent side of the mechanical bar screen is connected to an equalization tank. An equalization tank lift pump is installed inside the equalization tank, which is connected to an anoxic tank. A self-cleaning filter chamber is installed between the anoxic tank and the membrane bioreactor. The inlet of the self-cleaning filter chamber is connected to the anoxic tank, and the effluent outlet of the self-cleaning filter chamber is connected to the membrane bioreactor. A lifting isolation gate is slidably installed on one side of the inlet of the self-cleaning filter chamber. A wedge-shaped filter screen is arranged inside the self-cleaning filter chamber. A conical sludge collection hopper is installed below the wedge-shaped filter screen. A reverse aeration purge pipe is arranged on the back surface of the wedge-shaped filter screen. The bottom of the conical sludge collection hopper is connected to a sludge discharge branch pipe, which is connected to a sludge tank. The membrane module body is installed inside the membrane bioreactor.

2. The small integrated sewage treatment device according to claim 1, characterized in that, The membrane module's main water collection pipe is connected to the product water pipeline, which in turn is connected to the greywater clear water tank. The blower's output end is connected to the aeration main pipeline, which in turn is connected to the bottom aeration and air distribution component and the reverse aeration and purging pipe in the membrane module.

3. The small-scale integrated sewage treatment device according to claim 2, characterized in that, The membrane module body includes a membrane frame, hollow fiber membrane filaments, membrane filament ends, a membrane module water collection main pipe and an aeration guide plate. The hollow fiber membrane filaments are sealed and fixed through the casting end. The inner cavity of the hollow fiber membrane filaments is connected to the membrane module water collection main pipe. The aeration guide plate is fixed at the lower part of the membrane frame and located below the hollow fiber membrane filaments. The bottom aeration distribution component is arranged below the aeration guide plate.

4. A small integrated sewage treatment device according to claim 3, characterized in that, The isolation gate is slidably installed in the vertical direction. When the isolation gate slides down, it blocks the inlet of the self-cleaning filter chamber. When the isolation gate slides up, it opens the water inlet channel.

5. A small-scale integrated sewage treatment device according to claim 4, characterized in that, The reverse aeration purge pipe is provided with purge holes facing the wedge-shaped filter screen.

6. A small-scale integrated sewage treatment device according to claim 5, characterized in that, The water production pipeline is equipped with a vacuum gauge, a vacuum self-priming pump, a regulating valve, and a flow meter in sequence along the direction of water production flow.

7. A small-scale integrated sewage treatment device according to claim 6, characterized in that, It also includes a nitrification liquor return submersible pump and a waste sludge submersible pump. The nitrification liquor return submersible pump is installed in the membrane bioreactor and is connected to the nitrification liquor return pipeline. The other end of the nitrification liquor return pipeline is connected to the anoxic tank. The waste sludge submersible pump is installed inside the membrane bioreactor and is connected to the sludge discharge pipeline, which leads to the sludge tank.

8. A small integrated sewage treatment device according to claim 7, characterized in that, The wedge-shaped filter screen is arranged at an angle inside the self-cleaning filter chamber, and the bottom of the conical sludge collection hopper narrows downwards.

9. The treatment method of a small integrated sewage treatment device according to claim 8, characterized in that, Includes the following steps: Step S1: After large particulate impurities are removed by mechanical screen, the wastewater enters the equalization tank. The equalization tank lift pump transports the wastewater in the equalization tank to the anoxic tank for denitrification. Step S2: Lift the isolation gate to open, and the effluent from the anoxic tank flows into the self-cleaning filter chamber. The sewage is filtered through the wedge-shaped filter screen, and fibers, large pieces of scum and aggregated sludge are intercepted. Normal activated sludge flocs pass through the wedge-shaped filter screen and enter the membrane bioreactor. The intercepted impurities fall into the conical sludge collection hopper by their own weight. Step S3: In the membrane bioreactor, the blower aerates the water through the bottom aeration and air distribution components and the vacuum self-priming pump draws the water. The hollow fiber membrane fibers complete the solid-liquid separation. The permeate is transported to the greywater clear water tank through the membrane module water collection main pipe and the permeate pipeline. The nitrification liquid return submersible pump returns the nitrification mixture in the membrane bioreactor to the anoxic tank. The remaining sludge submersible pump periodically discharges the remaining sludge in the membrane bioreactor into the sludge tank. Step S4: Close the lifting isolation gate to isolate the self-cleaning filter chamber, open the reverse aeration purging pipe to perform reverse aeration purging on the back surface of the wedge filter screen, and after purging, open the sludge discharge branch pipe. The debris trapped in the conical sludge collection hopper is discharged into the sludge tank. After the sludge discharge is completed, close the sludge discharge branch pipe, reopen the lifting isolation gate, and restore normal filtration.

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