Gravity membrane wastewater treatment system

Abstract

The application discloses a gravity membrane sewage treatment system and belongs to the technical field of water purification. Mainly comprising a membrane pool, a PLC control system arranged outside the membrane pool, a membrane assembly installed in the membrane pool, a water outlet pipe installed on one side of the membrane pool, a switching shaft bearing connected in the membrane pool, the switching shaft being arranged on the side of the membrane assembly away from the water outlet pipe, two groups of accumulation grooves symmetrically arranged in the circumferential direction of the switching shaft, the two groups of accumulation grooves being used for switching and accommodating the impurities deposited after filtration in the membrane pool, an aeration assembly arranged in the membrane pool, a detection assembly arranged in the membrane pool, and a cleaning assembly arranged in the membrane pool. Through cooperation of the detection assembly and the cleaning assembly, the deposited impurities in the membrane pool can be automatically cleaned, so that frequent shutdown for cleaning the deposited impurities in the membrane pool is avoided, and the sewage filtration efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of water purification technology, and specifically to a gravity membrane sewage treatment system. Background Art

[0002] Gravity-type chemical-free cleaning ultrafiltration membrane systems produce water by the potential difference (gravity) between inlet and outlet water. Gravity-type ultrafiltration membranes have lower pretreatment requirements, strong impact load resistance, stable water quality, and better water quality. In particular, they have incomparable advantages in filtering out micropollutants compared to ordinary ultrafiltration membranes. Therefore, they are more advantageous when used in water treatment with severe pollution and large-scale projects.

[0003] In order to ensure the effectiveness of gravity ultrafiltration membrane filtration, aeration is usually used to clean the surface impurities of the gravity ultrafiltration membrane during use. The principle is to introduce air into the membrane pool and use the shear force and disturbance generated by the rising bubbles to remove impurities on the membrane surface, thereby restoring the filtration performance of the membrane.

[0004] However, the impurities cleaned by aeration still exist in the membrane pool and gradually accumulate at the bottom of the membrane pool. When the impurities accumulate to a certain extent, the effect of aeration cleaning will be reduced. At this time, it is necessary to suspend filtration to clean the impurities accumulated in the membrane pool, which reduces the efficiency of sewage treatment in the membrane pool.

[0005] Therefore, it is necessary to provide a gravity membrane sewage treatment system to solve the above problems.

[0006] It should be noted that the above information disclosed in this Background section is only for understanding the background of the present inventive concept and therefore it may contain information that does not constitute the prior art. Summary of the Invention

[0007] Based on the above problems existing in the prior art, the technical problem to be solved by the present invention is: to provide a gravity membrane sewage treatment system, which can automatically clean the impurities accumulated in the membrane pool.

[0008] The technical solution adopted by the present application to solve its technical problem is: a gravity membrane sewage treatment system, comprising a membrane pool; a PLC control system, the PLC control system being arranged outside the membrane pool; a membrane assembly, the membrane assembly being installed in the membrane pool, the membrane assembly being used to filter the sewage in the membrane pool; an outlet pipe, the outlet pipe being installed on one side of the membrane pool, the outlet pipe being used to discharge the filtered water; a switching shaft, the switching shaft bearing being connected in the membrane pool, the switching shaft being arranged on a side of the membrane assembly away from the outlet pipe, the switching shaft being symmetrically provided with two groups of accumulation grooves in the circumferential direction, the two groups of accumulation grooves being used to switch and receive impurities precipitated after filtration in the membrane pool; A driving unit 1, which is fixedly mounted on the front side of the membrane pool, is connected to the PLC control system signal, and the output end of the driving unit 1 is coaxially fixed with the switching shaft, and the driving unit 1 is used to control the rotation of the switching shaft; an aeration assembly, which is arranged in the membrane pool, and is used to clean impurities on the filtering surface of the membrane assembly; a detection assembly, which is arranged in the membrane pool, and is suitable for detecting whether impurities accumulated in the accumulation tank need to be cleaned when the aeration assembly is started; a cleaning assembly, which is arranged in the membrane pool, and is used to clean impurities accumulated in the accumulation tank;

[0009] Wherein: the switching shaft is suitable for rotating under the drive of the driving part 1 when the detection component detects that the impurities accumulated in the accumulation groove meet the cleaning requirements, thereby switching the positions of the two groups of accumulation grooves, and the cleaning component cleans the accumulation groove with impurities after the position switching of the accumulation groove is completed.

[0010] Furthermore, the aeration assembly includes an air distribution pipe fixedly installed under the membrane pool, one end of the air distribution pipe is connected to a fan, and multiple groups of aeration pipes are arranged side by side on the inner side of the membrane pool, one end of the multiple groups of aeration pipes are fixedly connected to the air distribution pipe, and the other end of the aeration pipe is connected to the membrane pool.

[0011] Furthermore, the detection component includes two groups of switching pipelines arranged in an inner circumferential array of the switching shaft, the two groups of switching pipelines are on the same cross-section of the switching shaft, one end of the two groups of switching pipelines is connected to the bottom of the stacking tank, and the other end is respectively connected to the outer circle of the switching shaft, a detection pipeline is opened on the inner side of the membrane pool, one end of the detection pipeline is connected to the aeration pipeline, and the other end of the detection pipeline is connected to the switching pipeline, a pressure pipeline is opened on the inner side of the membrane pool, one end of the pressure pipeline is connected to the detection pipeline, and the other end of the pressure pipeline is connected to a sensing component, and the sensing component is used to detect the pressure condition in the pressure pipeline.

[0012] Furthermore, the sensing component includes a pressure sleeve fixedly mounted on the membrane pool, the upper end of the pressure sleeve is provided with a hole connected to the pressure pipeline, the inner side of the pressure sleeve is slidably connected to a piston, the inner side of the pressure sleeve is provided with an elastic part, the elastic part is used to give the piston a force to slide toward the pressure pipeline, a contact sensor is fixedly mounted on the inner side of the upper end of the pressure sleeve, and the contact sensor is connected to the PLC control system signal.

[0013] Furthermore, the inner side of the pressure sleeve is threadedly connected to a contact sleeve, a knob is fixedly mounted on the lower end of the contact sleeve, and the elastic portion is arranged between the contact sleeve and the piston.

[0014] Furthermore, the cleaning component includes a brushing part connected to the membrane pool by a bearing, the brushing part consists of a rotating shaft and bristles, a driving part 2 is fixedly installed on the membrane pool, the driving part 2 is connected to the PLC control system signal, the output end of the driving part 2 is coaxially fixed with the brushing part, a cleaning pipeline is opened on the inner side of the membrane pool, the cleaning pipeline is suitable for connecting with the switching pipeline on the opposite side when the detection pipeline is connected to the switching pipeline, a water pump is fixedly installed on the membrane pool, the output end of the water pump is connected to the cleaning pipeline, the input end of the water pump is connected to the cleaning liquid pool, and the water pump is connected to the PLC control system signal.

[0015] Furthermore, a resistance bar is fixedly installed on the inner axial direction of the pressure sleeve, the contact sleeve is a conductor, the contact sleeve is connected to the PLC control system signal, a contact block is fixedly installed on one side of the piston, the contact block is always in contact with the resistance bar, and the contact block wire is connected to a power supply.

[0016] Furthermore, a scale is provided on the outside of the knob.

[0017] Furthermore, a second sealing portion is provided at one end of the aeration pipeline communicating with the inner side of the membrane tank.

[0018] Furthermore, a sealing portion 1 is provided at one end of the switching pipeline communicating with the stacking tank.

[0019] The beneficial effect of the present application is that the present application provides a gravity membrane sewage treatment system, which can automatically clean the impurities accumulated in the membrane pool through the cooperation of the detection component and the cleaning component, thereby avoiding frequent shutdowns to clean the impurities accumulated in the membrane pool and improving the efficiency of sewage filtration.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is an overall schematic diagram of a gravity membrane wastewater treatment system in this application;

[0023] Figure 2 for Figure 1 Schematic diagram of the overall cross section;

[0024] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle;

[0025] Figure 4 for Figure 3 A magnified schematic diagram of area B in the middle;

[0026] Among them, the reference numerals in the figures are:

[0027] 1. Membrane tank; 2. Outlet pipe; 3. Membrane assembly; 4. Water pump; 5. Drive unit 1; 6. Drive unit 2; 7. Air distribution pipe; 8. Aeration pipeline; 9. Detection pipeline; 10. Pressure pipeline; 11. Switching shaft; 12. Cleaning pipeline; 13. Switching pipeline; 14. Brushing unit; 15. Accumulation tank; 16. Sealing unit 1; 17. Sealing unit 2; 18. Pressure sleeve; 19. Piston; 20. Elastic unit; 21. Resistor bar; 22. Contact sleeve; 23. Knob; 24. Contact sensor; 25. Contact block. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] like Figure 1As shown, the present application provides a gravity membrane sewage treatment system, including a membrane pool 1, which is used to provide a space for sewage filtration. A membrane assembly 3 is inserted inside the membrane pool 1. The membrane assembly 3 is the core part of the gravity ultrafiltration membrane sewage treatment system and is usually composed of a plurality of ultrafiltration membrane filaments. These ultrafiltration membrane filaments have a specific pore size and structure and can effectively intercept impurities such as suspended particles, colloidal particles, macromolecular organic matter, microorganisms and their metabolites in the water. An outlet pipe 2 is fixedly installed at the lower left side of the membrane pool 1, and the outlet pipe 2 is used to discharge the filtered water;

[0031] The sewage is poured into the right side of the membrane pool 1 through the conveying system. Under the influence of gravity, the sewage flows to the left side of the membrane pool 1 and filters the sewage when passing through the membrane assembly 3, so that the filtered water flows out from the outlet pipe 2. By controlling the sewage pouring speed, the sewage on the right side of the membrane assembly 3 always maintains a liquid level difference of half a meter with the water level after filtering on the left side of the membrane assembly 3, so that the gravity ultrafiltration membrane sewage treatment system can operate normally.

[0032] A PLC control system is fixedly installed on the outside of the membrane pool 1. The PLC control system is used to automatically control the electrical components in the gravity ultrafiltration membrane sewage treatment system.

[0033] like Figure 2-Figure 3 As shown, a switching shaft 11 is connected to the bearing at the lower inner side of the membrane pool 1. The switching shaft 11 is arranged on the side of the membrane assembly 3 away from the water outlet pipe 2. Two groups of accumulation grooves 15 are symmetrically opened in the circumferential direction of the switching shaft 11. The two groups of accumulation grooves 15 are used to switch and receive impurities precipitated after filtration in the membrane pool 1. When one group of accumulation grooves 15 is in an upward receiving position, its notch is connected to the interior of the membrane pool 1, and the accumulation grooves 15 are also at the bottom of the membrane pool 1, so that the precipitated impurities can enter the accumulation grooves 15, while the other group of accumulation grooves 15 is in a position with the notch facing downward.

[0034] like Figure 1 、 Figure 3 As shown, a drive unit 5 is fixedly installed on the front side of the membrane pool 1. The drive unit 5 is a servo motor. The drive unit 5 is connected to the PLC control system signal. The output end of the drive unit 5 is coaxially fixed with the switching shaft 11. The drive unit 5 is used to control the rotation of the switching shaft 11, so that the two groups of accumulation grooves 15 can switch to receive the impurities precipitated in the membrane pool 1.

[0035] like Figure 2-Figure 3 As shown, in order to clean the filtering surface of the membrane assembly 3 and ensure the efficiency of filtration, an aeration assembly is provided in the membrane pool 1;

[0036] The aeration assembly includes an air distribution pipe 7 fixedly installed below the membrane pool 1, and the front end pipeline of the air distribution pipe 7 is connected to a fan (not shown in the figure), and the fan is connected to the PLC control system signal. A plurality of groups of aeration pipes 8 are arranged side by side on the inner side of the membrane pool 1, and one end of the plurality of aeration pipes 8 is fixedly connected and communicated with the air distribution pipe 7, and the other end of the aeration pipe 8 is communicated with the membrane pool 1, and the end is located below the filtering surface of the membrane component 3. When the fan is started by the PLC control system, the fan will blow air into the air distribution pipe 7, and then transport it to the membrane pool 1 through each group of aeration pipes 8. After the air enters the membrane pool 1, bubbles are formed, and the shear force and disturbance generated when the bubbles rise are used to remove impurities on the surface of the membrane component 3, thereby restoring its filtration performance. By providing a plurality of groups of aeration pipes 8, the bubbles can pass through the surface of the membrane component 3 evenly, thereby improving the cleaning effect;

[0037] A sealing part 2 17 is provided at one end of the aeration pipe 8 that is connected to the inner side of the membrane tank 1. The sealing part 2 17 is composed of a spring and a sealing ball. When not subjected to the pressure of the air blown in by the fan, the sealing ball will retract into the aeration pipe 8 under the tension of the spring, thereby preventing the sewage in the membrane tank 1 from entering the aeration pipe 8 and causing blockage.

[0038] In order to prevent the filtered impurities from excessively accumulating at the bottom of the membrane pool 1, thereby affecting the filtration efficiency, a detection component is provided in the membrane pool 1. The detection component is suitable for detecting whether the impurities accumulated in the accumulation tank 15 need to be cleaned when the aeration component is started.

[0039] The detection assembly includes two sets of switching pipes 13 arranged in a circular array within the switching shaft 11. The two sets of switching pipes 13 are on the same cross-section of the switching shaft 11. One end of the two sets of switching pipes 13 is connected to the bottom of the accumulation tank 15. The end of the switching pipe 13 connected to the accumulation tank 15 is provided with a sealing portion 16. The structure of the sealing portion 16 and the sealing portion 2 17 are the same, and are also used to prevent sewage in the membrane tank 1 from entering the switching pipe 13 and causing blockage.

[0040] The other ends of the two sets of switching pipelines 13 are respectively connected to the outer surface of the switching shaft 11. A detection pipeline 9 is opened on the inner side of the membrane tank 1. One end of the detection pipeline 9 is connected to the aeration pipeline 8. When the stacking tank 15 is in the receiving position, the other end of the detection pipeline 9 will be connected to the switching pipeline 13. A pressure pipeline 10 is opened on the inner side of the membrane tank 1. One end of the pressure pipeline 10 is connected to the detection pipeline 9. The other end of the pressure pipeline 10 is connected to a sensing component for detecting the pressure condition in the pressure pipeline 10.

[0041] When more and more impurities are accumulated in the accumulation groove 15 at the receiving position, the pressure of the impurities on the sealing part 16 becomes greater. If the sealing part 16 is not lifted, when the fan blows air into the air distribution pipe 7, the air pressure in the detection pipeline 9 will gradually increase due to the blocked outlet.

[0042] like Figure 4 As shown, the sensing component includes a pressure sleeve 18 fixedly mounted on the membrane pool 1, the upper end of the pressure sleeve 18 is provided with a hole connected to the pressure pipeline 10, the inner side of the pressure sleeve 18 is slidably connected to a piston 19, the inner side of the pressure sleeve 18 is provided with an elastic portion 20, the elastic portion 20 is used to give the piston 19 a force to slide toward the pressure pipeline 10, and a contact sensor 24 is fixedly mounted on the inner side of the upper end of the pressure sleeve 18. The contact sensor 24 is connected to the PLC control system signal. When no external force is applied, the piston 19 is in contact with the contact sensor 24 due to the elastic force of the elastic portion 20;

[0043] When there is no accumulation of impurities in the accumulation tank 15, the air blown into the detection pipeline 9 will easily push up the sealing part 16 after passing through the switching pipeline 13, and the air pressure in the detection pipeline 9 will also decrease accordingly. At this time, the air pressure in the detection pipeline 9 will not affect the position of the piston 19 through the pressure pipeline 10. When the impurities in the accumulation tank 15 at the receiving position gradually increase, the force required to push up the sealing part 16 gradually increases, and the air pressure in the detection pipeline 9 will also increase accordingly. When the air pressure in the detection pipeline 9 is large enough to pass through the pressure pipeline 10 to make the piston 19 press After the elastic part 20 slides downward under elastic force, the contact sensor 24 detects that the piston 19 is separated from it and transmits a signal to the PLC control system. The PLC control system will control the driving part 15 to drive the switching shaft 11 to rotate 180 degrees, so that the two groups of accumulation grooves 15 switch positions. The accumulation groove 15 with no impurities accumulated and the original opening facing downward will rotate to the receiving position. Then the two groups of switching pipelines 13 will also exchange positions, and the detection pipeline 9 will be connected to the membrane tank 1 again. The pressure in the detection pipeline 9 will decrease, and the piston 19 will return to the contact position with the contact sensor 24.

[0044] The inner side of the pressure sleeve 18 is threadedly connected to the contact sleeve 22, and the lower end of the contact sleeve 22 is fixedly mounted with a knob 23. A scale is provided on the outer side of the knob 23, and the elastic part 20 is provided between the contact sleeve 22 and the piston 19. By turning the knob 23, the distance between the contact sleeve 22 and the piston 19 can be adjusted. When the distance is smaller, the pressure of the elastic part 20 on the piston 19 is greater, so that the air pressure in the detection pipeline 9 is greater than when the position of the contact sleeve 22 is not adjusted to make the piston 19 disengage from the contact sensor 24. When the distance is larger, the pressure of the elastic part 20 on the piston 19 is smaller, so that the air pressure in the detection pipeline 9 is smaller than when the position of the contact sleeve 22 is not adjusted to make the piston 19 disengage from the contact sensor 24. In this way, the amount of impurities accumulated in the accumulation groove 15 in the receiving position can be adjusted, thereby controlling the rotation conditions of the switching shaft 11, and the scale on the outer side of the knob 23 achieves the effect of precise control.

[0045] In order to enable the accumulation tank 15 to be repeatedly switched and used, a cleaning component is provided in the membrane pool 1, and the cleaning component is used to clean the impurities accumulated in the accumulation tank 15 that is not in the receiving position;

[0046] By adjusting the rotation of the switching shaft 11, while ensuring the filtration efficiency of the membrane assembly 3, the consumption of the cleaning assembly can be saved, the wear can be reduced, and the service life of the cleaning assembly can be increased;

[0047] The cleaning assembly includes a brushing part 14 connected to the membrane pool 1 by a bearing. The brushing part 14 is located directly below the switching shaft 11. The brushing part 14 consists of a rotating shaft and bristles. A driving part 2 6 is fixedly installed on the membrane pool 1. The driving part 2 6 is connected to the PLC control system signal. The output end of the driving part 2 6 is coaxially fixed with the brushing part 14.

[0048] A cleaning pipeline 12 is provided on the inner side of the membrane pool 1. The cleaning pipeline 12 is suitable for connecting with the switching pipeline 13 on the opposite side when the detection pipeline 9 is connected with the switching pipeline 13. A water pump 4 is fixedly installed on the membrane pool 1. The output end of the water pump 4 is connected to the cleaning pipeline 12, and the input end of the water pump 4 is connected to the cleaning liquid pool. The cleaning liquid pool contains cleaning liquid specially used to clean and filter impurities. The water pump 4 is connected to the PLC control system signal.

[0049] When the piston 19 returns to the contact position with the contact sensor 24, the contact sensor 24 will give a signal to the PLC control system again, thereby controlling the driving unit 2 6 to start through the PLC control system, thereby driving the scrubbing unit 14 to rotate. The bristles rotate along the rotating shaft to scrub and clean the accumulation tank 15 that has just rotated from the receiving position to the relative position. At the same time, the PLC control system will also give a signal to the water pump 4 to operate and extract the cleaning liquid in the cleaning liquid pool and transport it to the cleaning pipeline 12. The cleaning liquid is then sprayed out from the port of the accumulation tank 15 through the switching pipeline 13 and cooperates with the scrubbing unit 14 to clean the accumulation tank 15.

[0050] A resistor bar 21 is fixedly mounted on the inner axial direction of the pressure sleeve 18. The contact sleeve 22 is a conductor and is connected to the PLC control system signal. A contact block 25 is fixedly mounted on one side of the piston 19. The contact block 25 is always in contact with the resistor bar 21. The contact block 25 wire is connected to a power supply.

[0051] The current of the contact sleeve 22 can be changed by the resistor bar 21. A current detection module is provided in the PLC control system. The current on the contact sleeve 22 can be detected in real time by the current detection module. When the contact sleeve 22 is closer to the piston 19, the resistance between the contact sleeve 22 and the contact block 25 is smaller, and the current is larger. When the contact sleeve 22 is away from the piston 19, the resistance between the contact sleeve 22 and the contact block 25 is larger, and the current is smaller. In this way, the PLC control system can automatically adjust the brushing part 14 and the water pump 4 according to the detected current. The larger the current, the more impurities accumulated in the accumulation tank 15, and the brushing part 14 needs to rotate faster or for a longer time, and the water pump 4 needs to have a higher pressure or pump in more cleaning liquid, so as to ensure the quality of cleaning the accumulation tank 15.

[0052] Multiple groups of detection components and cleaning pipelines 12 can be evenly arranged in the axial direction of the switching shaft 11 to ensure uniform spraying of the cleaning liquid and avoid excessive accumulation of impurities in the axial direction of the switching shaft 11.

[0053] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gravity membrane sewage treatment system, characterized by: include: Membrane pool (1); A PLC control system, the PLC control system being arranged outside the membrane pool (1); A membrane assembly (3), the membrane assembly (3) being installed in the membrane pool (1), and the membrane assembly (3) being used to filter the sewage in the membrane pool (1); A water outlet pipe (2), the water outlet pipe (2) being installed on one side of the membrane pool (1), and the water outlet pipe (2) being used to discharge filtered water; A switching shaft (11), the switching shaft (11) having a bearing connected to the membrane pool (1), the switching shaft (11) being arranged on a side of the membrane assembly (3) away from the water outlet pipe (2), and two groups of accumulation grooves (15) being symmetrically provided in the circumferential direction of the switching shaft (11), the two groups of accumulation grooves (15) being used for switching and receiving impurities precipitated after filtration in the membrane pool (1); A driving part (5) is fixedly mounted on the front side of the membrane pool (1), the driving part (5) is connected to the PLC control system signal, the output end of the driving part (5) is coaxially fixed with the switching shaft (11), and the driving part (5) is used to control the rotation of the switching shaft (11); an aeration component, the aeration component being arranged in the membrane pool (1), and being used to clean impurities on the filtering surface of the membrane component (3); a detection component, the detection component being arranged in the membrane pool (1), and being adapted to detect whether impurities accumulated in the accumulation tank (15) need to be cleaned when the aeration component is started; A cleaning component is provided in the membrane pool (1), and is used to clean impurities accumulated in the accumulation tank (15); Wherein: the switching shaft (11) is adapted to rotate under the drive of the driving part (5) when the detection component detects that the impurities accumulated in the accumulation groove (15) meet the cleaning requirements, thereby switching the positions of the two groups of the accumulation grooves (15), and the cleaning component cleans the accumulation grooves (15) containing impurities after the position switching of the accumulation grooves (15) is completed; The aeration assembly comprises an air distribution pipe (7) fixedly installed below the membrane pool (1), one end of the air distribution pipe (7) is connected to a fan, and multiple groups of aeration pipes (8) are arranged side by side on the inner side of the membrane pool (1), one end of each of the multiple groups of aeration pipes (8) is fixedly connected to the air distribution pipe (7), and the other end of the aeration pipe (8) is connected to the inside of the membrane pool (1); The detection component includes two groups of switching pipelines (13) arranged in an inner circumferential array on the switching shaft (11). The two groups of switching pipelines (13) are on the same cross-section of the switching shaft (11). One end of the two groups of switching pipelines (13) is connected to the bottom of the stacking tank (15), and the other end is respectively connected to the outer circle of the switching shaft (11). A detection pipeline (9) is opened on the inner side of the membrane pool (1). One end of the detection pipeline (9) is connected to the aeration pipeline (8), and the other end of the detection pipeline (9) is connected to the switching pipeline (13). A pressure pipeline (10) is opened on the inner side of the membrane pool (1). One end of the pressure pipeline (10) is connected to the detection pipeline (9), and the other end of the pressure pipeline (10) is connected to a sensing component. The sensing component is used to detect the pressure condition in the pressure pipeline (10).

2. A gravity membrane wastewater treatment system according to claim 1, characterized in that: The sensing component includes a pressure sleeve (18) fixedly mounted on the membrane pool (1), the upper end of the pressure sleeve (18) is provided with a hole connected to the pressure pipeline (10), the inner side of the pressure sleeve (18) is slidably connected to a piston (19), the inner side of the pressure sleeve (18) is provided with an elastic part (20), the elastic part (20) is used to give the piston (19) a force to slide toward the pressure pipeline (10), and a contact sensor (24) is fixedly mounted on the inner side of the upper end of the pressure sleeve (18), and the contact sensor (24) is connected to the PLC control system signal.

3. A gravity membrane sewage treatment system according to claim 2, characterized in that: The inner side of the pressure sleeve (18) is threadedly connected to a contact sleeve (22), a knob (23) is fixedly mounted on the lower end of the contact sleeve (22), and the elastic portion (20) is arranged between the contact sleeve (22) and the piston (19).

4. A gravity membrane wastewater treatment system according to claim 3, characterized in that: The cleaning component includes a brushing part (14) connected to the membrane pool (1) by a bearing, the brushing part (14) consists of a rotating shaft and bristles, a driving part (6) is fixedly installed on the membrane pool (1), the driving part (6) is connected to the PLC control system signal, the output end of the driving part (6) is coaxially fixed with the brushing part (14), a cleaning pipeline (12) is opened on the inner side of the membrane pool (1), the cleaning pipeline (12) is suitable for connecting with the switching pipeline (13) on the opposite side when the detection pipeline (9) is connected to the switching pipeline (13), a water pump (4) is fixedly installed on the membrane pool (1), the output end of the water pump (4) is connected to the cleaning pipeline (12), the input end of the water pump (4) is connected to the cleaning liquid pool, and the water pump (4) is connected to the PLC control system signal.

5. A gravity membrane sewage treatment system according to claim 4, characterized in that: A resistance bar (21) is fixedly mounted on the inner axial direction of the pressure sleeve (18); the contact sleeve (22) is a conductor; the contact sleeve (22) is connected to the PLC control system signal; a contact block (25) is fixedly mounted on one side of the piston (19); the contact block (25) is always in contact with the resistance bar (21); and the contact block (25) is connected to a power supply through its wire.

6. A gravity membrane wastewater treatment system according to claim 5, characterized in that: A scale is provided on the outside of the knob (23).

7. A gravity membrane wastewater treatment system according to claim 6, characterized in that: One end of the aeration pipeline (8) communicating with the inner side of the membrane tank (1) is provided with a second sealing portion (17).

8. A gravity membrane wastewater treatment system according to claim 7, characterized in that: One end of the switching pipeline (13) communicating with the stacking tank (15) is provided with a sealing portion (16).

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