Domestic sewage treatment equipment and treatment method thereof

Abstract

This invention discloses a domestic sewage treatment device and its treatment method, relating to the field of domestic sewage treatment technology. It addresses the problem that in existing domestic sewage treatment equipment, the internal MBR membrane sways with the aeration airflow, causing the MBR membrane to be frequently stretched, affecting its service life, and that the MBR membrane can only be cleaned by backwashing after shutdown, a cumbersome process. The invention provides a filter module, installed inside the treatment tank, with four filter modules. Each filter module includes high-performance hollow membrane fibers, a water collection cover, a metal plate, and a vibration transmission cover. The surface of the high-performance hollow membrane fibers has several micropores, and multiple high-performance hollow membrane fibers are arranged. The water collection cover is installed above the high-performance hollow membrane fibers, and the upper end of the high-performance hollow membrane fibers is connected to the water collection cover. The metal plate is installed below the high-performance hollow membrane fibers, and the metal plate is fixedly connected to the lower end of the high-performance hollow membrane fibers.

Description

Technical Field

[0001] This invention relates to the field of domestic sewage treatment technology, specifically to a domestic sewage treatment device and treatment method. Background Technology

[0002] In environmental protection technologies, the treatment of domestic sewage generated daily in cities has become an increasingly urgent and unavoidable issue. If the continuous discharge of organic-rich domestic sewage into cities is allowed unchecked, it will inevitably have immeasurable and detrimental effects on the natural environment, polluting the air, soil, and water sources, and jeopardizing people's living conditions. MBR (Membrane Bioreactor) wastewater treatment is a commonly used modern wastewater treatment method. It combines biological treatment technology with membrane separation technology, replacing the secondary sedimentation tank in traditional processes. It can efficiently separate solids and liquids, producing stable reclaimed water for direct use, and it also has low energy consumption and a small footprint.

[0003] An existing wastewater treatment device, such as announcement number CN209940756U, entitled "A Domestic Wastewater MBR Membrane Treatment Device," includes a housing. A partition is fixedly welded inside the housing, dividing it into a pretreatment tank, a sedimentation tank, an MBR membrane tank, and a clear water tank. An inlet is located on one side of the pretreatment tank. The pretreatment tank and the sedimentation tank are interconnected at their lower parts. A filter screen is installed inside the sedimentation tank. A sludge pump is installed at the bottom of the sedimentation tank. A water pump is installed above the filter screen in the sedimentation tank. The MBR membrane tank is connected to the sedimentation tank via the water pump. An MBR membrane module is installed inside the MBR membrane tank. The MBR membrane module includes a frame, with fixing blocks on the outer side of the frame and hollow fiber membrane filaments installed on the inner side of the frame.

[0004] However, in existing domestic sewage treatment equipment, the MBR membrane inside the equipment shakes with the aeration airflow, causing the MBR membrane to be frequently stretched, which affects its service life. Furthermore, the MBR membrane can only be cleaned by backwashing after shutdown, which is a rather cumbersome process. Therefore, we provide a domestic sewage treatment equipment and treatment method. Summary of the Invention

[0005] The purpose of this invention is to provide a domestic sewage treatment device and its treatment method to solve the problems mentioned in the background art, where the MBR membrane inside the existing domestic sewage treatment device shakes with the aeration airflow during operation, causing the MBR membrane to be frequently in a stretched state, affecting its service life, and the MBR membrane can only be cleaned by backwashing after shutdown, which is a cumbersome process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a domestic sewage treatment device, including a treatment tank, an inlet pipe provided at the lower side of one side of the treatment tank, an aeration main pipe provided above the inlet pipe, an aeration branch pipe provided at the front end of the aeration main pipe, three aeration branch pipes provided, and one end of each of the three aeration branch pipes being connected to the aeration main pipe, an air inlet pipe provided at the middle position of the front end of the aeration main pipe, and a discharge pipe provided at the lower front end of the treatment tank;

[0007] Also includes:

[0008] A filter module is installed inside the treatment box, and four filter modules are provided. Each filter module includes a high-performance hollow membrane fiber, a water collection cover, a metal plate, and a vibration transmission cover. The surface of the high-performance hollow membrane fiber is provided with a number of micropores, and multiple high-performance hollow membrane fibers are provided. The water collection cover is installed above the high-performance hollow membrane fiber, and the upper end of the high-performance hollow membrane fiber is connected to the water collection cover. The metal plate is installed below the high-performance hollow membrane fiber, and the metal plate is fixedly connected to the lower end of the high-performance hollow membrane fiber. The vibration transmission cover is installed below the metal plate. The four corners of the water collection cover are fixedly connected to the metal plate through brackets.

[0009] Metal wires are arranged around the outer wall of the high-performance hollow membrane filaments, and the two ends of the metal wires are fixedly connected to the metal sheet and the water collection cover, respectively.

[0010] A U-shaped water collection pipe is installed on the upper end of the water collection cover, and the lower end of the U-shaped water collection pipe is connected to the water collection cover. A manifold is installed on the upper end of the U-shaped water collection pipe, and a flange is installed on one end of the manifold.

[0011] Preferably, an ultrasonic transducer is installed on the bottom surface of the metal sheet, and multiple ultrasonic transducers are provided. An ultrasonic generator is installed at the front end of the upper end of the water collection cover, and the output end of the ultrasonic generator is electrically connected to the input end of the ultrasonic transducer.

[0012] Preferably, a flow sensor is installed at the connection between the U-shaped water collection pipe and the manifold, and the output end of the flow sensor is electrically connected to the input end of the ultrasonic generator through a control terminal.

[0013] Preferably, a PVDF protective layer is provided on the outer wall of the high-performance hollow membrane filament.

[0014] Preferably, connecting rods are installed on both sides of the upper end of the filter module. One end of the connecting rods on both sides is fixedly connected by a lifting frame, and the lifting frame is fixedly connected to the manifold. The lifting frame has four lifting holes inside, which are equidistantly distributed. Reinforcing rods are installed between adjacent connecting rods.

[0015] Preferably, module positioning blocks are installed on both sides of the inner wall of the processing box, and eight module positioning blocks are provided. The module positioning blocks are provided with positioning grooves inside. Connecting blocks are installed on both sides of the upper end of the filter module, and the connecting blocks are engaged with the positioning grooves in the module positioning blocks. Triangular reinforcing plates are installed on both sides of the lower end of the module positioning blocks.

[0016] Preferably, a magnetic absorbing plate is installed on the bottom surface of the connecting block, a magnetic absorbing groove is provided inside the positioning groove, and an electromagnet is installed inside the magnetic absorbing groove.

[0017] Preferably, a first electrically controlled three-way valve is installed at one end of the water inlet pipe, a wastewater pipe interface is provided at one end of the first electrically controlled three-way valve, and a chemical pipe interface is provided at the other end of the first electrically controlled three-way valve. A second electrically controlled three-way valve is installed at one end of the discharge pipe, a sludge discharge pipe interface is provided at one end of the second electrically controlled three-way valve, and a chemical liquid recovery pipe interface is provided at the other end of the second electrically controlled three-way valve.

[0018] Preferably, the other end of the aeration branch pipe extends through and into the interior of the treatment box, and is fitted with a plug. The plug is fixedly connected to the inner wall of the treatment box. An aeration disc is installed on the outer wall of the aeration branch pipe, and multiple aeration discs are provided. The surface of the aeration disc is provided with several air holes.

[0019] Preferably, a method for treating domestic sewage using a sewage treatment device includes the following steps:

[0020] Step 1: The inlet pipe is connected to the wastewater pipe interface through the first electrically controlled three-way valve. The pump transports the wastewater premixed with nitrifying bacteria activated sludge in the aerobic tank to the treatment tank along the inlet pipe.

[0021] Step 2: After the wastewater arrives at the treatment tank, the aeration system introduces air into the main aeration pipe. After being distributed through the branch aeration pipes, oxygen is injected into the mixed liquor through the aeration discs to meet the aerobic requirements of nitrifying bacteria. At the same time, the end of the manifold is connected to a negative pressure suction system. With a low negative pressure suction effect, the mixed liquor enters the high-performance hollow membrane fiber. After entering the U-shaped water collection pipe through the water collection cover, it is collected and discharged through the manifold. When the mixed liquor enters the high-performance hollow membrane fiber, the activated sludge and impurities in the wastewater are isolated on the outside, achieving filtration and purification.

[0022] Step 3: During the purification process, each filter module can self-detect the production water flow rate through the flow sensor at the connection between the U-shaped water collection pipe and the manifold. If the flow rate is lower than the preset threshold of the flow sensor, it indicates that there are many impurities attached to the surface of the high-performance hollow membrane fiber of the filter module. At this time, the flow sensor sends a signal to the control terminal, and the control terminal feeds back a signal to the ultrasonic generator. The ultrasonic generator drives the ultrasonic transducer to run. The ultrasonic transducer converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal plate to vibrate at high frequency, which drives the metal wire to pull the high-performance hollow membrane fiber to vibrate at high frequency, quickly removing surface impurities. When the flow sensor detection result is greater than the preset threshold, the flow sensor resends a signal to the control terminal, and the control terminal feeds back a signal to shut down the ultrasonic generator, realizing the filter module's self-cleaning without stopping.

[0023] Step 4: Every 24 hours of purification, the second electrically controlled three-way valve discharges the waste liquid from the sludge discharge pipe interface. At the same time, the first electrically controlled three-way valve switches to the chemical agent pipe interface to introduce the chemical solution into the treatment tank for chemical cleaning. After completion, the second electrically controlled three-way valve switches to the chemical solution recovery pipe interface to recover the treated chemical solution and avoid secondary pollution.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention incorporates metal wires around the outer wall of high-performance hollow fiber membranes. During aeration, the metal wires ensure the stability of the membranes, preventing significant swaying with the water flow and reducing the tensile force on the membranes during use. During purification, each filter module can self-detect the permeate flow rate via a flow sensor at the connection between the U-shaped water collection pipe and the manifold. If the flow rate is lower than the preset threshold of the flow sensor, it indicates that there are many impurities adhering to the surface of the high-performance hollow fiber membranes in that filter module. In this case, the flow sensor sends a signal to the control terminal, which then feeds back a signal to the ultrasonic generator, which drives the ultrasonic transducer. During operation, the ultrasonic transducer converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal plate to vibrate at high frequency. This vibration drives the metal wires to pull the high-performance hollow membrane fibers to vibrate at high frequency, quickly removing surface impurities. When the flow sensor detects a value greater than a preset threshold, the flow sensor resends a signal to the control terminal, which then sends a feedback signal to shut down the ultrasonic generator. This achieves self-cleaning of the filter module without stopping the machine, solving the problem that in existing domestic sewage treatment equipment, the internal MBR membrane shakes with the aeration airflow, causing the MBR membrane to be frequently stretched, affecting its service life. Furthermore, the MBR membrane can only be cleaned by backwashing after shutdown, which is a cumbersome process.

[0026] 2. The filter module of the present invention is initially positioned on both sides by connecting blocks and positioning grooves in the module positioning block. The connecting blocks are further attracted and fixed to the magnetic grooves in the positioning grooves by magnetic absorbing plates to ensure the stability of the fixation. When disassembly is required, the electromagnet located in the magnetic groove is driven to generate the same magnetic field as the magnetic absorbing plate. Relying on the magnetic repulsion, the filter module and the module positioning block can be separated by a lifting tool, which is convenient for inspection and maintenance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the filter module of the present invention;

[0030] Figure 4 This is a partial structural diagram of the high-performance hollow membrane fiber of the present invention;

[0031] Figure 5 This is a schematic diagram of the module positioning block structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the connection structure between the main aeration pipe and the branch aeration pipes of the present invention;

[0033] In the diagram: 1. Treatment tank; 2. Inlet pipe; 3. First electrically controlled three-way valve; 4. Wastewater pipe interface; 5. Chemical pipe interface; 6. Discharge pipe; 7. Second electrically controlled three-way valve; 8. Sludge discharge pipe interface; 9. Chemical recovery pipe interface; 10. Filter module; 11. Module positioning block; 111. Positioning groove; 112. Magnetic suction groove; 113. Electromagnet; 114. Triangular reinforcing plate; 12. High-performance hollow membrane fiber; 121. PVDF protective layer; 122. Metal wire; 123. Micropores; 3. Water collection cover; 14. Metal sheet; 15. Vibration transmission cover; 16. Bracket; 17. U-shaped water collection pipe; 18. Manifold; 19. Flow sensor; 20. Flange; 21. Lifting frame; 22. Connecting rod; 23. Reinforcing rod; 24. Lifting hole; 25. Connecting block; 251. Magnetic suction plate; 26. Ultrasonic generator; 27. Ultrasonic transducer; 28. Aeration main pipe; 29. ​​Aeration branch pipe; 30. Air inlet pipe; 31. Aeration disc; 32. Air hole; 33. Seal. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Please see Figure 1-6 An embodiment of the present invention provides a domestic sewage treatment device, including a treatment tank 1, an inlet pipe 2 is provided at the lower side of one side of the treatment tank 1, an aeration main pipe 28 is provided above the inlet pipe 2, an aeration branch pipe 29 is provided at the front end of the aeration main pipe 28, there are three aeration branch pipes 29, and one end of each of the three aeration branch pipes 29 is connected to the aeration main pipe 28, an air inlet pipe 30 is provided at the middle position of the front end of the aeration main pipe 28, and a discharge pipe 6 is provided at the lower front end of the treatment tank 1.

[0036] Also includes:

[0037] The filter module 10 is installed inside the treatment box 1, and four filter modules 10 are provided. The filter module 10 includes a high-performance hollow membrane fiber 12, a water collection cover 13, a metal plate 14, and a vibration transmission cover 15. The surface of the high-performance hollow membrane fiber 12 is provided with a number of micropores 123, and there are multiple high-performance hollow membrane fibers 12. The water collection cover 13 is installed above the high-performance hollow membrane fiber 12, and the upper end of the high-performance hollow membrane fiber 12 is connected to the water collection cover 13. The metal plate 14 is installed below the high-performance hollow membrane fiber 12, and the metal plate 14 is fixedly connected to the lower end of the high-performance hollow membrane fiber 12. The vibration transmission cover 15 is installed below the metal plate 14. The four corners of the water collection cover 13 are fixedly connected to the metal plate 14 through brackets 16.

[0038] Metal wire 122 is disposed around the outer wall of high-performance hollow membrane filament 12, and both ends of metal wire 122 are fixedly connected to metal sheet 14 and water collection cover 13 respectively.

[0039] U-shaped water collection pipe 17 is installed at the upper end of water collection cover 13, and the lower end of U-shaped water collection pipe 17 is connected to water collection cover 13. A manifold 18 is installed at the upper end of U-shaped water collection pipe 17, and a flange 20 is installed at one end of manifold 18.

[0040] During the purification process, each filter module 10 can self-detect the production water flow rate through the flow sensor 19 at the connection between the U-shaped water collection pipe 17 and the manifold 18. If the flow rate is lower than the preset threshold of the flow sensor 19, it indicates that there are many impurities attached to the surface of the high-performance hollow membrane filaments 12 of the filter module 10. At this time, the flow sensor 19 sends a signal to the control terminal, and the control terminal feeds back a signal to the ultrasonic generator 26. The ultrasonic generator 26 drives the ultrasonic transducer 27 to run. The ultrasonic transducer 27 converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal plate 14 to vibrate at high frequency, which drives the metal wire 122 to pull the high-performance hollow membrane filaments 12 to vibrate at high frequency, quickly removing surface impurities. When the detection result of the flow sensor 19 is greater than the preset threshold, the flow sensor 19 resends a signal to the control terminal, and the control terminal feeds back a signal to shut down the ultrasonic generator 26, realizing the self-cleaning of the filter module 10 without stopping.

[0041] Please see Figure 2 and Figure 3 An ultrasonic transducer 27 is installed on the bottom surface of the metal sheet 14, and multiple ultrasonic transducers 27 are provided. An ultrasonic generator 26 is installed at the front end of the upper end of the water collection cover 13. The output end of the ultrasonic generator 26 is electrically connected to the input end of the ultrasonic transducer 27. The ultrasonic generator 26 can drive the ultrasonic transducer 27 to run. The ultrasonic transducer 27 converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal sheet 14 to vibrate at high frequency, which drives the metal wire 122 to drive the high-performance hollow membrane filament 12 to vibrate at high frequency, quickly removing surface impurities.

[0042] Please see Figure 2 A flow sensor 19 is installed at the connection between the U-shaped water collection pipe 17 and the manifold 18. The output of the flow sensor 19 is electrically connected to the input of the ultrasonic generator 26 through the control terminal. During the purification process, each filter module 10 can detect the production water flow rate through the flow sensor 19 at the connection between the U-shaped water collection pipe 17 and the manifold 18. If the flow rate is lower than the preset threshold of the flow sensor 19, it means that there are more impurities attached to the surface of the high-performance hollow membrane fiber 12 of the filter module 10. At this time, the flow sensor 19 sends a signal to the control terminal, and the control terminal feeds back a signal to the ultrasonic generator 26.

[0043] Please see Figure 4 The outer wall of the high-performance hollow membrane filament 12 is provided with a PVDF protective layer 121. The PVDF protective layer 121 has excellent physical and chemical stability and oxidation resistance, which can ensure the service life of the PVDF protective layer 121.

[0044] Please see Figure 2 Connecting rods 22 are installed on both sides of the upper end of the filter module 10. One end of the connecting rods 22 is fixedly connected by a lifting frame 21, and the lifting frame 21 is fixedly connected to the manifold 18. The lifting frame 21 has four lifting holes 24 inside, and the four lifting holes 24 are evenly distributed. Reinforcing rods 23 are installed between adjacent connecting rods 22. During lifting, the lifting tool can be fixed to the lifting hole 24, and the filter module 10 can be taken out from the processing box 1 by lifting, which is convenient for maintenance and replacement.

[0045] Please see Figure 1 , Figure 2 and Figure 5Both sides of the inner wall of the processing box 1 are equipped with module positioning blocks 11, and there are eight module positioning blocks 11. The module positioning blocks 11 have positioning grooves 111 inside. Both sides of the upper end of the filter module 10 are equipped with connecting blocks 25, and the connecting blocks 25 are engaged with the positioning grooves 111 inside the module positioning blocks 11. Both sides of the lower end of the module positioning blocks 11 are equipped with triangular reinforcing plates 114. The filter module 10 is initially positioned by the connecting blocks 25 on both sides and the positioning grooves 111 inside the module positioning blocks 11.

[0046] Please see Figure 3 and Figure 5 A magnetic absorbing piece 251 is installed on the bottom surface of the connecting block 25, and a magnetic absorbing groove 112 is provided inside the positioning groove 111. An electromagnet 113 is installed inside the magnetic absorbing groove 112. The connecting block 25 is further attracted and fixed to the magnetic absorbing groove 112 in the positioning groove 111 by the magnetic absorbing piece 251 to ensure the stability of the fixation. When disassembly is required, the electromagnet 113 located in the magnetic absorbing groove 112 is driven to generate the same magnetic field as the magnetic absorbing piece 251. Relying on the magnetic repulsion, the filter module 10 can be separated from the module positioning block 11 by cooperating with the lifting tool.

[0047] Please see Figure 1 One end of the inlet pipe 2 is equipped with a first electrically controlled three-way valve 3, one end of which is connected to a wastewater pipe interface 4, and the other end of which is connected to a chemical pipe interface 5. One end of the discharge pipe 6 is equipped with a second electrically controlled three-way valve 7, one end of which is connected to a sludge discharge pipe interface 8, and the other end of which is connected to a chemical solution recovery pipe interface 9. Every 24 hours of purification, the waste liquid inside is discharged from the sludge discharge pipe interface 8 by the second electrically controlled three-way valve 7, and at the same time, the first electrically controlled three-way valve 3 switches to the chemical solution interface 5 to introduce the chemical solution into the treatment tank 1 for chemical cleaning. After the cleaning is completed, the second electrically controlled three-way valve 7 switches to the chemical solution recovery pipe interface 9 to recover the treated chemical solution and avoid secondary pollution.

[0048] Please see Figure 1 and Figure 6 The other end of the aeration branch pipe 29 passes through and extends into the interior of the treatment box 1, and is equipped with a plug 33. The plug 33 is fixedly connected to the inner wall of the treatment box 1. An aeration disc 31 is installed on the outer wall of the aeration branch pipe 29, and multiple aeration discs 31 are provided. Several air holes 32 are provided on the surface of the aeration disc 31, and aeration can meet the aeration requirements of nitrifying bacteria.

[0049] Please see Figure 1-6 A method for treating domestic sewage using a sewage treatment device includes the following steps:

[0050] Step 1: The inlet pipe 2 is connected to the wastewater pipe interface 4 through the first electrically controlled three-way valve 3. The pump transports the wastewater premixed with the nitrifying bacteria activated sludge in the aerobic tank to the treatment tank 1 along the inlet pipe 2.

[0051] Step 2: After the wastewater arrives at the treatment tank 1, the aeration system introduces air into the aeration main pipe 28. After being diverted through the aeration branch pipe 29, oxygen is injected into the mixed liquid through the aeration disc 31 to meet the aerobic requirements of nitrifying bacteria. At the same time, the end of the manifold 18 is connected to a negative pressure suction system. With a low negative pressure suction effect, the mixed liquid enters the high-performance hollow membrane fiber 12, enters the U-shaped water collection pipe 17 along the water collection cover 13, and is collected and discharged through the manifold 18. When the mixed liquid enters the high-performance hollow membrane fiber 12, the activated sludge and impurities in the wastewater are isolated on the outside, achieving filtration and purification.

[0052] Step 3: During the purification process, each filter module 10 can self-detect the water flow rate through the flow sensor 19 at the connection between the U-shaped water collection pipe 17 and the manifold 18. If the flow rate is lower than the preset threshold of the flow sensor 19, it means that there are many impurities attached to the surface of the high-performance hollow membrane filaments 12 of the filter module 10. At this time, the flow sensor 19 sends a signal to the control terminal, and the control terminal feeds back a signal to the ultrasonic generator 26. The ultrasonic generator 26 drives the ultrasonic transducer 27 to run. The ultrasonic transducer 27 converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal plate 14 to vibrate at high frequency, which drives the metal wire 122 to pull the high-performance hollow membrane filaments 12 to vibrate at high frequency, quickly removing surface impurities. When the detection result of the flow sensor 19 is greater than the preset threshold, the flow sensor 19 resends a signal to the control terminal, and the control terminal feeds back a signal to shut down the ultrasonic generator 26, realizing the self-cleaning of the filter module 10 without stopping.

[0053] Step 4: Every 24 hours of purification, the waste liquid inside is discharged from the sludge discharge pipe interface 8 by the second electrically controlled three-way valve 7. At the same time, the first electrically controlled three-way valve 3 switches to the chemical agent pipe interface 5 to introduce the chemical solution into the treatment tank 1 for chemical cleaning. After completion, the second electrically controlled three-way valve 7 switches to the chemical solution recovery pipe interface 9 to recover the treated chemical solution and avoid secondary pollution.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A domestic sewage treatment device, comprising a treatment tank (1), an inlet pipe (2) is provided below one side of the treatment tank (1), an aeration main pipe (28) is provided above the inlet pipe (2), an aeration branch pipe (29) is provided at the front end of the aeration main pipe (28), there are three aeration branch pipes (29), and one end of each of the three aeration branch pipes (29) is connected to the aeration main pipe (28), an air inlet pipe (30) is provided at the middle position of the front end of the aeration main pipe (28), and a discharge pipe (6) is provided below the front end of the treatment tank (1); Its features are: Also includes: A filter module (10) is installed inside the processing box (1), and four filter modules (10) are provided. The filter module (10) includes a high-performance hollow membrane fiber (12), a water collection cover (13), a metal plate (14) and a vibration transmission cover (15). The surface of the high-performance hollow membrane fiber (12) is provided with a number of micropores (123), and multiple high-performance hollow membrane fibers (12) are provided. The water collection cover (13) is installed above the high-performance hollow membrane fiber (12), and the upper end of the high-performance hollow membrane fiber (12) is connected to the water collection cover (13). The metal plate (14) is installed below the high-performance hollow membrane fiber (12), and the metal plate (14) is fixedly connected to the lower end of the high-performance hollow membrane fiber (12). The vibration transmission cover (15) is installed below the metal plate (14). The four corners of the water collection cover (13) are fixedly connected to the metal plate (14) through brackets (16). Metal wire (122) is disposed around the outer wall of the high-performance hollow membrane filament (12), and the two ends of the metal wire (122) are fixedly connected to the metal sheet (14) and the water collection cover (13) respectively. A U-shaped water collection pipe (17) is installed on the upper end of the water collection cover (13), and the lower end of the U-shaped water collection pipe (17) is connected to the water collection cover (13). A manifold (18) is installed on the upper end of the U-shaped water collection pipe (17), and a flange (20) is installed on one end of the manifold (18). An ultrasonic transducer (27) is installed on the bottom surface of the metal sheet (14), and multiple ultrasonic transducers (27) are provided. An ultrasonic generator (26) is installed at the front end of the upper end of the water collection cover (13), and the output end of the ultrasonic generator (26) is electrically connected to the input end of the ultrasonic transducer (27). The ultrasonic generator (26) drives the ultrasonic transducer (27) to operate. The ultrasonic transducer (27) converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal plate (14) to vibrate at high frequency, which in turn drives the metal wire (122) to pull the high-performance hollow membrane filament (12) to vibrate at high frequency.

2. The domestic sewage treatment equipment according to claim 1, characterized in that: A flow sensor (19) is installed at the connection between the U-shaped water collection pipe (17) and the manifold (18), and the output end of the flow sensor (19) is electrically connected to the input end of the ultrasonic generator (26) through the control terminal.

3. The domestic sewage treatment equipment according to claim 2, characterized in that: The outer wall of the high-performance hollow membrane filament (12) is provided with a PVDF protective layer (121).

4. A domestic sewage treatment device according to claim 3, characterized in that: Connecting rods (22) are installed on both sides of the upper end of the filter module (10). One end of the connecting rods (22) on both sides is fixedly connected by a lifting frame (21), and the lifting frame (21) is fixedly connected to the manifold (18). The lifting frame (21) is provided with lifting holes (24) inside. There are four lifting holes (24), and the four lifting holes (24) are equidistantly distributed. Reinforcing rods (23) are installed between adjacent connecting rods (22).

5. A domestic sewage treatment device according to claim 4, characterized in that: The processing box (1) has module positioning blocks (11) installed on both sides of its inner wall, and there are eight module positioning blocks (11). The module positioning blocks (11) have positioning grooves (111) inside. The filter module (10) has connecting blocks (25) installed on both sides of its upper end, and the connecting blocks (25) are engaged with the positioning grooves (111) inside the module positioning blocks (11). The module positioning blocks (11) have triangular reinforcing plates (114) installed on both sides of its lower end.

6. A domestic sewage treatment device according to claim 5, characterized in that: The bottom surface of the connecting block (25) is equipped with a magnetic absorbing piece (251), the inside of the positioning groove (111) is provided with a magnetic absorbing groove (112), and an electromagnet (113) is installed inside the magnetic absorbing groove (112).

7. A domestic sewage treatment device according to claim 6, characterized in that: One end of the water inlet pipe (2) is equipped with a first electrically controlled three-way valve (3), one end of the first electrically controlled three-way valve (3) is provided with a wastewater pipe interface (4), the other end of the first electrically controlled three-way valve (3) is provided with a medicine pipe interface (5), one end of the discharge pipe (6) is equipped with a second electrically controlled three-way valve (7), one end of the second electrically controlled three-way valve (7) is provided with a sludge discharge pipe interface (8), and the other end of the second electrically controlled three-way valve (7) is provided with a medicine recovery pipe interface (9).

8. A domestic sewage treatment device according to claim 7, characterized in that: The other end of the aeration branch pipe (29) extends through and into the interior of the treatment box (1), and is fitted with a plug (33). The plug (33) is fixedly connected to the inner wall of the treatment box (1). An aeration disc (31) is installed on the outer wall of the aeration branch pipe (29), and multiple aeration discs (31) are provided. Several air holes (32) are provided on the surface of the aeration discs (31).

9. A method for treating domestic sewage using a sewage treatment device, implemented based on the domestic sewage treatment device described in claim 8, characterized in that, Includes the following steps: Step 1: The inlet pipe (2) is connected to the wastewater pipe interface (4) through the first electrically controlled three-way valve (3). The pump transports the wastewater premixed with the nitrifying bacteria activated sludge in the aerobic tank to the treatment tank (1) along the inlet pipe (2). Step 2: After the wastewater arrives at the treatment tank (1), the aeration system introduces air into the aeration main pipe (28). After being diverted through the aeration branch pipe (29), oxygen is injected into the mixed liquid through the aeration disc (31) to meet the aerobic requirements of nitrifying bacteria. At the same time, the end of the manifold (18) is connected to the negative pressure suction system. With a low negative pressure suction effect, the mixed liquid enters the high-performance hollow membrane fiber (12), enters the U-shaped water collection pipe (17) through the water collection cover (13), and is collected and discharged through the manifold (18). When the mixed liquid enters the high-performance hollow membrane fiber (12), the activated sludge and impurities in the wastewater are isolated on the outside, achieving filtration and purification. Step 3: During the purification process, each filter module (10) can self-detect the production water flow rate through the flow sensor (19) at the connection between the U-shaped water collection pipe (17) and the manifold (18). If the flow rate is lower than the preset threshold of the flow sensor (19), it means that there are more impurities attached to the surface of the high-performance hollow membrane fiber (12) of the filter module (10). At this time, the flow sensor (19) sends a signal to the control terminal, and the control terminal feeds back the signal to the ultrasonic generator (26). The ultrasonic generator (26) drives the process. When the ultrasonic transducer (27) is running, the ultrasonic transducer (27) converts the acoustic energy of the ultrasonic frequency source into mechanical vibration, causing the metal plate (14) to vibrate at high frequency, which drives the metal wire (122) to pull the high-performance hollow membrane wire (12) to vibrate at high frequency, quickly removing surface impurities. When the flow sensor (19) detects a result greater than the preset threshold, the flow sensor (19) resends a signal to the control terminal, and the control terminal sends a feedback signal to shut down the ultrasonic generator (26), thus realizing the non-stop self-cleaning of the filter module (10). Step 4: Every 24 hours of purification, the waste liquid inside is discharged from the sludge discharge pipe interface (8) by the second electric three-way valve (7), and at the same time the first electric three-way valve (3) is switched to the chemical pipe interface (5) to introduce the chemical liquid into the treatment tank (1) for chemical cleaning. After completion, the second electric three-way valve (7) is switched to the chemical liquid recovery pipe interface (9) to recover the treated chemical liquid and avoid secondary pollution.

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