Dual inspection device and method for single membrane in water treatment membrane modules

Abstract

This invention discloses a dual-inspection device and method for single membranes in a water treatment membrane module, relating to the field of water treatment technology. Each single membrane is equipped with an outlet solenoid valve. The main control box controls the opening and closing of the outlet solenoid valve to perform individual inspections and a binary inspection of the membrane module. The main control box identifies damaged single membranes based on the outlet turbidity value measured by a turbidity detector; it also identifies fouled single membranes based on the transmembrane pressure difference value measured by a pressure sensor, cleans the fouled single membranes, while normal membranes continue to produce water. Through individual inspection and binary inspection methods, as well as targeted membrane fouling cleaning, rapid inspection of membrane integrity and filtration performance can be achieved, and damaged and fouled membranes can be located. Then, corresponding measures such as targeted membrane fouling control can be taken, avoiding the occurrence of downtime for the entire membrane module due to problems with individual membranes. This greatly improves the water treatment efficiency of the membrane module and significantly reduces the energy consumption of the equipment.

Description

Technical Field

[0001] This invention relates to the fields of wastewater treatment and water resource reuse, and in particular to a dual inspection device and method for a single membrane of a water treatment membrane module. Background Technology

[0002] In the fields of wastewater treatment and water resource reuse, membrane bioreactors (MBRs) are a novel and highly efficient water treatment technology that combines activated sludge processes with membrane separation technology. MBRs are classified into hollow fiber membrane MBRs and flat sheet membrane MBRs based on the structure of their membrane modules. Compared to hollow fiber membrane MBRs, flat sheet membrane MBRs offer advantages such as simple membrane replacement, strong anti-fouling performance, high mechanical stability, and convenient membrane fouling cleaning, and have been widely used in urban wastewater treatment and resource recovery, as well as special wastewater treatment. The core unit of the flat sheet membrane MBR process is the membrane module, which typically consists of dozens or even hundreds of individual membranes. Its operating principle mainly relies on the membrane's permeability to water and its ability to retain impurities to achieve efficient separation of pollutants and water, ensuring that the effluent turbidity is below 0.5 or even lower. Therefore, membrane integrity and filtration performance are extremely important in MBR water treatment. However, after a certain period of operation, especially after processes such as strong aeration, scraping of particulate pollutants, and chemical cleaning, the membrane is prone to mechanical or chemical damage, resulting in increased turbidity of the effluent and substandard water quality. On the other hand, during the membrane filtration process, pollutants trapped by the membrane will accumulate on the membrane surface and inside the membrane pores. As membrane fouling worsens, the transmembrane pressure difference also increases, leading to increased energy consumption and reduced water production efficiency.

[0003] Typically, when the effluent turbidity of an MBR process exceeds the standard, the MBR unit must be shut down, the water in the reaction tank drained, or the membrane modules removed to locate any damaged individual membranes. This process consumes a significant amount of time, manpower, and resources, greatly reducing the MBR's water production efficiency.

[0004] For increased transmembrane pressure caused by membrane fouling, the usual solution is to physically or chemically clean the entire membrane module. However, due to the complex and variable flow field within an MBR reactor, the cross-flow velocities and shear forces of water and gas on different membrane surfaces vary significantly, resulting in substantial differences in the degree of membrane fouling across different membranes. This method of physically and chemically cleaning the entire membrane module without considering the differences in membrane fouling across different membranes is poorly targeted, energy-intensive, and may not yield ideal results.

[0005] To address the above issues, patent application No. 202010245529.5, filed on March 31, 2022, discloses a device and method for inspecting membranes one by one using a visual probe. This method locates individual membranes with defects by observing the surface of each membrane in the MBR tank. While this approach avoids shutting down the entire membrane module, the visual inspection device (including the subsequent membrane cleaning actuator) needs to move between membranes, resulting in a relatively large membrane spacing and consequently, lower membrane flux per unit volume. Furthermore, inspecting each membrane individually with a visual probe is slow and time-consuming. Additionally, underwater visual probes are easily affected by activated sludge, aeration bubbles, and fouling layers on the membrane surface within the MBR tank, impacting the final assessment.

[0006] Therefore, when the MBR system indicates excessive turbidity, how to quickly locate the damaged single membrane; even if the effluent water quality meets the standards, how to discover the membrane with minor damage and the single membrane with severe pollution during routine inspections, and take corresponding effective measures, is of great significance for improving the water production efficiency of MBR and avoiding the occurrence of system shutdown. Summary of the Invention

[0007] The purpose of this invention is to provide a dual inspection device and method for a single membrane in a water treatment membrane module, which can quickly locate damaged and contaminated single membranes and adopt targeted membrane cleaning methods, thereby greatly improving the water treatment efficiency of the membrane module.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] A dual inspection device for a single membrane in a water treatment membrane module, the dual inspection device for a single membrane includes: a membrane module composed of several single membranes, an outlet solenoid valve group composed of several outlet solenoid valves, several outlet branch pipes, an outlet main pipe, a turbidity detector, a pressure sensor, a main control box, and a membrane fouling control device.

[0010] Each single membrane has an outlet branch pipe on one side, and all outlet branch pipes of the single membranes converge into the outlet main pipe. Each outlet branch pipe is equipped with an outlet solenoid valve. A pressure sensor and a turbidity detector are installed sequentially along the water flow direction on the outlet main pipe. A membrane fouling control device is connected to the other side of each single membrane.

[0011] The main control box is connected to the control terminals of all outlet solenoid valves; the main control box is used to control whether each single membrane produces water by controlling the outlet solenoid valves.

[0012] The signal output terminal of the turbidity detector is connected to the main control box; the turbidity detector is used to monitor the effluent turbidity value during membrane module operation in real time; the main control box is used to determine whether there is damage to the single membrane or multiple membranes in the solenoid valve open state based on the obtained effluent turbidity value when using one-by-one inspection or two-way inspection. If a damaged membrane is found, the effluent solenoid valve corresponding to the damaged membrane is closed, and the time is waited for the opportunity to replace the damaged membrane. Other normal single membranes can continue to produce water.

[0013] The signal output terminal of the pressure sensor is connected to the main control box; the pressure sensor is used to monitor the transmembrane pressure difference of the membrane module in real time; the main control box is also used to open the outlet solenoid valve of each membrane in turn during the inspection, and to determine whether the transmembrane pressure difference of the membrane in the open state exceeds the set value. If it exceeds the set value, it indicates that the membrane is fouled.

[0014] The main control box is connected to the control terminal of the membrane fouling control device. The main control box is also used to turn on the membrane fouling control device to clean the fouled single membrane.

[0015] A dual-inspection method for a single membrane in a water treatment membrane module, characterized in that the single membrane inspection method includes:

[0016] The damaged individual films can be identified by either a step-by-step inspection or a two-part inspection method.

[0017] Close the outlet solenoid valve of the damaged membrane and remove it from the membrane module to replace it with a new membrane;

[0018] The transmembrane pressure difference of each individual membrane was measured by a step-by-step inspection method.

[0019] A single membrane with a transmembrane pressure difference greater than the filtration transmembrane pressure difference is identified as a fouled single membrane.

[0020] Close the solenoid valve of the fouled membrane outlet to perform targeted membrane fouling control and clean the fouled membrane.

[0021] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0022] This invention discloses a dual-inspection device and method for single membranes in a water treatment membrane module. Each single membrane is equipped with an outlet solenoid valve. The main control box controls the opening and closing of the outlet solenoid valve to perform individual inspections and a binary inspection of the membrane module. The main control box identifies damaged single membranes based on the turbidity value measured by the turbidity detector; it also identifies fouled single membranes based on the transmembrane pressure difference measured by the pressure sensor. The fouled single membranes are then cleaned, while normal membranes continue to produce water. Through individual inspection and binary inspection methods, as well as targeted membrane fouling cleaning, rapid inspection of membrane integrity and filtration performance can be achieved, and damaged and fouled membranes can be located. Then, corresponding measures such as targeted membrane fouling control can be taken, avoiding the need for the entire membrane module to be shut down for maintenance due to problems with individual membranes. This greatly improves the water treatment efficiency of the membrane module and significantly reduces the energy consumption of the equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the MBR single-membrane dual-inspection and membrane fouling control device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the MBR single-membrane dual-inspection and membrane fouling water backwashing device provided in an embodiment of the present invention;

[0026] Figure 3 This is a plan view of the aeration system provided in an embodiment of the present invention;

[0027] Figure 4 A circuit diagram of an MBR single-membrane dual-inspection and membrane fouling control device provided in an embodiment of the present invention.

[0028] Figure 5 This is a flowchart of a dual inspection method for a single membrane in a water treatment membrane module, provided as an embodiment of the present invention.

[0029] Symbol explanation:

[0030] 1-Membrane module, 2-Single membrane, 3-Outlet branch pipe, 4-Outlet solenoid valve, 5-Outlet solenoid valve assembly, 6-Outlet main pipe, 7-Turbidity detector, 8-Pressure sensor, 9-Outlet pipeline pump, 10-Water backwash pipeline pump, 11-Water backwash solenoid valve, 12-Water backwash solenoid valve assembly, 13-Water backwash branch pipe, 14-Water backwash main pipe, 15-Air compressor, 16-Gas flow meter, 17-Pneumatic solenoid valve assembly, 18-Pneumatic solenoid valve, 19-Aeration pipe assembly, 20-Aeration pipe, 21-Membrane status display device, 22-Main control box, 23-Power distribution box, 24-Filter tank. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To address the problems of substandard effluent quality, reduced treatment efficiency, and even shutdown for maintenance caused by single-membrane damage or severe membrane fouling in existing membrane modules in the water treatment field, this invention provides a single-membrane dual-inspection device for water treatment membrane modules. When the effluent turbidity value exceeds a set threshold, the single-membrane inspection device and multi-algorithm operating software can quickly locate the damaged single membrane and shut it down, while normal, undamaged membranes continue to operate. Through a single-membrane inspection device, when the transmembrane pressure difference exceeds a set value, the fouled single membrane can be quickly located, and the corresponding targeted membrane fouling cleaning program can be initiated, while other normal membranes continue to operate. This avoids the manpower and material resources wasted on shutting down the entire membrane module for maintenance, greatly improving the water treatment efficiency of the membrane module.

[0033] This invention provides methods for both routine inspections and emergency inspections:

[0034] 1) Routine inspections are conducted using a time-weighted, step-by-step inspection method. When the influent water level is low (e.g., during nighttime hours at urban wastewater treatment plants), step-by-step inspections can be performed directly. When the influent water level is high, inspections can be conducted at regular intervals. The inspection cycle is controlled according to the influent water level; the higher the water level, the longer the cycle. If routine inspections have been delayed for an extended period due to high water levels, they can be conducted as soon as possible using the time-weighted method. Routine inspections measure the effluent turbidity and transmembrane pressure difference of each individual membrane. If the turbidity does not meet the requirements, the individual membrane is considered faulty, and its corresponding solenoid valve is shut off. When the turbidity meets the requirements, it is determined whether the transmembrane pressure difference exceeds the set threshold. If several membranes have excessive transmembrane pressure differences, the solenoid valves corresponding to these membranes are shut off, and the targeted membrane fouling cleaning procedure is initiated.

[0035] 2) Emergency inspection is conducted when the turbidity of the membrane module effluent does not meet the requirements. A binary method is used for rapid inspection. In this case, only the effluent turbidity index is tested to quickly locate the membrane with defects and close its corresponding solenoid valve. The binary method is used to detect membranes without problems, without further subdivision; the problematic groups are then further divided and tested until all problematic membranes are found and their corresponding solenoid valves are closed.

[0036] Reference Figure 1 The present invention provides a dual inspection device for a single membrane of a water treatment membrane module, comprising: a membrane module 1 composed of several single membranes 2, an outlet solenoid valve group 5 composed of several outlet solenoid valves 4, several outlet branch pipes 3, an outlet main pipe 6, a turbidity detector 7, a pressure sensor 8, a main control box 22, and a membrane fouling control device.

[0037] Each single membrane 2 has an outlet branch pipe 3 on one side. All outlet branch pipes 3 of the single membranes 2 converge into the outlet main pipe 6. Each outlet branch pipe 3 is equipped with an outlet solenoid valve 4. A pressure sensor 8 and a turbidity detector 7 are sequentially installed along the water flow direction on the outlet main pipe 6. A membrane fouling control device is connected to the other side of each single membrane 2. The main control box 22 is connected to the control terminals of all outlet solenoid valves 4. The main control box 22 is used to control whether each single membrane 2 produces water by controlling the outlet solenoid valves 4.

[0038] The signal output terminal of the turbidity detector 7 is connected to the main control box 22; the turbidity detector 7 is used to monitor the effluent turbidity value of the membrane module 1 in real time during operation; the main control box 22 is used to determine whether the single membrane 2 or multiple membranes in the solenoid valve open state are damaged when performing one-by-one inspection or two-way inspection, based on the obtained effluent turbidity value. If a damaged membrane is found, the effluent solenoid valve 4 corresponding to the damaged membrane is closed, and the time is waited for the opportunity to replace the damaged membrane.

[0039] The signal output terminal of the pressure sensor 8 is connected to the main control box 22; the pressure sensor 8 is used to monitor the transmembrane pressure difference of the membrane module 1 in real time; the main control box 22 is also used to open the outlet solenoid valve 4 of the single membrane 2 one by one when performing inspection, and to determine whether the transmembrane pressure difference of the single membrane 2 with the outlet solenoid valve 4 in the open state exceeds the set threshold. If it exceeds the set threshold, it indicates that the single membrane 2 is fouled.

[0040] The main control box 22 is connected to the control terminal of the membrane fouling control device. The main control box 22 is also used to turn on the membrane fouling control device to clean the fouled single membrane 2.

[0041] For example, membrane module 1 is a flat sheet membrane module.

[0042] This invention incorporates a solenoid valve at each membrane outlet, allowing for individual control of each membrane and the acquisition of data on its single-membrane filtration performance, such as transmembrane pressure difference and turbidity value. The filtration efficiency of single membrane 2 is determined based on its effluent turbidity value, identifying any leaks. The degree of membrane fouling is assessed based on the transmembrane pressure difference, determining whether to continue filtration or implement fouling control measures. The dual-inspection method includes fixed-point backwashing and fixed-point aeration cleaning, or a combination of both.

[0043] The dual inspection device for the single membrane 2 also includes a membrane status display device 21. The membrane status display device 21 includes several variable-color lights. One light is installed on each single membrane 2; the control terminals of the multiple lights are connected to the main control box 22; the main control box 22 is used to control the lights to emit light of a color corresponding to the current state of the single membrane, thus displaying the state of the single membrane 2; the state is normal, damaged, or contaminated. This achieves the display and position marking of normal membrane, damaged membrane, and contaminated membrane. Each state corresponds to a different color.

[0044] The membrane fouling control device includes: a water backwash main pipe 14, several water backwash branch pipes 13, several water backwash solenoid valves 11, multiple aeration pipes 20, and several pneumatic solenoid valves 18. Each single membrane 2 is connected to a water backwash branch pipe 13 on its other side, and all water backwash branch pipes 13 are connected to the water backwash main pipe 14; each water backwash branch pipe 13 is equipped with a water backwash solenoid valve 11; the control terminals of all water backwash solenoid valves 11 are connected to the main control box 22. All water backwash solenoid valves 11 constitute a water backwash solenoid valve group 12.

[0045] Multiple aeration pipes 20 are evenly distributed along the membrane arrangement direction at the bottom of the membrane tank, with one aeration pipe 20 corresponding to every 1 to 3 membranes; each aeration pipe 20 is connected to a pneumatic solenoid valve 18; the control terminals of all pneumatic solenoid valves 18 are connected to the main control box 22.

[0046] The main control box 22 is used to control the pneumatic solenoid valve 18 to perform fixed-point aeration or to control the water backwash solenoid valve 11 to perform water backwashing membrane cleaning program, or both at the same time, to clean the contaminated single membrane 2.

[0047] The water backwashing main pipe 14, several water backwashing branch pipes 13, and water backwashing solenoid valve 11 constitute a fixed-point water backwashing device. Several aeration pipes 20 and several pneumatic solenoid valves 18 constitute a fixed-point aeration device. Several aeration pipes form an aeration pipe group 19, and several aeration solenoid valves form a pneumatic solenoid valve group 17. The fixed-point aeration device also includes a gas flow meter 16 and an air compressor 15.

[0048] This invention employs one of the dual inspection schemes based on the different operating states of the MBR, which can promptly detect problematic single membranes and greatly improve inspection efficiency.

[0049] Taking the application of a single-membrane dual-inspection device in a submerged membrane bioreactor (MBR) device as an example, Figures 1-4 As shown. MBR is a novel water treatment technology combining membrane separation and biological treatment units. Through the efficient retention of the membrane, it significantly improves sludge-water separation efficiency and completely retains suspended solids within the MBR, thereby increasing the concentration of activated sludge, extending sludge retention time, and greatly improving the biochemical treatment efficiency of wastewater. The submerged membrane bioreactor includes: 1. Membrane module; 2. Single membrane; 3. Effluent branch pipe; 4. Effluent solenoid valve; 5. Effluent solenoid valve assembly; 6. Effluent main pipe; 7. Turbidity detector; 8. Pressure sensor; 9. Effluent pipeline pump; 10. Water backwash pipeline pump; 11. Water backwash solenoid valve; 12. Water backwash branch pipe; 13. Water backwash main pipe; 14. Air compressor; 15. Gas flow meter; 16. Pneumatic solenoid valve assembly; 17. Pneumatic solenoid valve; 18. Aeration pipe assembly; 19. Aeration pipe; 20. Membrane status display device; 21. Main control box; 22. Power distribution box; 23. Filter tank; and 24.

[0050] This invention also provides a method for dual inspection of a single membrane in a water treatment membrane module, such as... Figure 5 As shown, the single-membrane maintenance method includes:

[0051] Step 1: Identify the damaged individual films by conducting inspections one by one or by using a two-way inspection method.

[0052] 1) Step-by-step inspection method:

[0053] Reduce the speed of the outlet pump to 1 / n of the set operating speed; where n is the number of individual membranes in the membrane module;

[0054] At the same time, open the solenoid valve corresponding to the membrane under test, close the solenoid valves corresponding to other single membranes other than the membrane under test, and collect the turbidity value and transmembrane pressure difference value of the effluent from the single membrane under test.

[0055] Following the steps described above, open the effluent solenoid valve of each individual membrane while closing the effluent solenoid valves of the other membranes, and collect the effluent turbidity value and transmembrane pressure difference value of each individual membrane.

[0056] When the turbidity value of the effluent exceeds the set turbidity threshold, it is determined to be a damaged membrane. The effluent solenoid valve of that single membrane must be closed, and it must be removed from the membrane module and replaced with a new single membrane.

[0057] When the transmembrane pressure difference exceeds the set threshold, it is determined to be a fouled single membrane. The effluent solenoid valve of the fouled membrane is then closed, and the membrane fouling control procedure is implemented.

[0058] 2) A binary inspection method is used to quickly identify damaged individual films, specifically including:

[0059] Reduce the speed of the outlet pipeline pump to m / n of the preset operating speed, and simultaneously open the outlet solenoid valves corresponding to the m groups of single membranes to be tested, and close the outlet solenoid valves corresponding to the single membranes other than the m groups of single membranes; where n is the number of single membranes contained in the membrane module; when n is even, m = n / 2; when n is odd, m = (n+1) / 2 or m = (n-1) / 2;

[0060] Collect the turbidity values ​​of the effluent from m groups of single membranes to be tested;

[0061] If the turbidity value of the effluent from the m groups of single membranes is greater than the preset turbidity threshold, the m groups of single membranes will be inspected again using the dichotomy method. The value of n will be updated to the value of m, and the process will return to the step "reduce the speed of the effluent pipeline pump to the preset operating speed m / n, open the effluent solenoid valve corresponding to the m groups of single membranes to be tested, and close the effluent solenoid valve corresponding to the single membranes other than the m groups of single membranes", until the damaged single membrane is found.

[0062] If the effluent turbidity of the m-group single membranes is less than or equal to the membrane group turbidity threshold, it is confirmed that there is no damaged single membrane in the m-group single membranes. It is necessary to detect the nm-group single membranes other than the m-group single membranes. The detection is continued by using the binary search method. The value of n is updated to the value of nm, and the process returns to the step "reduce the speed of the effluent pipeline pump to the preset operating speed m / n, open the effluent solenoid valve corresponding to the m-group single membrane to be detected, and close the effluent solenoid valve corresponding to the single membranes other than the m-group single membranes", until the damaged single membrane is found.

[0063] Step 2: Close the outlet solenoid valve of the damaged membrane and remove it from the membrane module to replace it with a new membrane.

[0064] After closing the outlet solenoid valve of the damaged membrane, wait for the right moment to remove the damaged membrane from the membrane module.

[0065] Step 3: Measure the transmembrane pressure difference of each single membrane by inspecting it one by one.

[0066] For example, the transmembrane pressure difference of each individual membrane is measured by a step-by-step inspection method, specifically including:

[0067] When the filter is turned on or after the filter has been running for a preset time, the individual membranes are inspected one by one.

[0068] Reduce the speed of the outlet pipeline pump to 1 / n of the preset operating speed;

[0069] Open the solenoid valve corresponding to the membrane under test, close the solenoid valve corresponding to the single membrane other than the membrane under test, and simultaneously collect the transmembrane pressure difference value of the single membrane under test.

[0070] Step 4: Identify single membranes whose transmembrane pressure difference is greater than the filtration transmembrane pressure difference as contaminated single membranes.

[0071] Step 5: Close the solenoid valve of the fouled membrane outlet to perform targeted membrane fouling control and clean the fouled membrane.

[0072] For single-membrane fouling control, the methods for point-to-point membrane fouling control are point-to-point water backwashing program (optimizing water backwashing time and intensity), point-to-point aeration program (optimizing aeration time and intensity), or a combination of both.

[0073] The fixed-point water backwashing specifically includes: closing the outlet solenoid valve 4 of the fouled single membrane and simultaneously opening the water backwash solenoid valve 11 corresponding to the fouled single membrane; determining the rotation speed of the water backwash pipeline pump 10 according to the number of fouled single membranes; turning on the water backwash pipeline pump 10 and making the water backwash pipeline pump 10 run at the determined rotation speed.

[0074] The fixed-point aeration cleaning process includes: closing the effluent solenoid valve 4 of the fouled single membrane, opening the pneumatic solenoid valve 18 of the aeration pipe 20 corresponding to the location of the fouled single membrane, and simultaneously turning on the air compressor 15; determining the value of the gas flow meter 16 according to the required aeration volume, and controlling the gas flow according to the determined value of the gas flow meter 16.

[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0076] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A double patrol device for a single membrane of a water treatment membrane module assembly, characterized by, The double-patrol device of the single membrane comprises a membrane assembly composed of a plurality of single membranes, a water outlet electromagnetic valve group composed of a plurality of water outlet electromagnetic valves, a plurality of water outlet branch pipes, a water outlet main pipe, a turbidity detector, a pressure sensor, a main control box and a membrane pollution control device; One side of each single membrane is provided with a water outlet branch pipe, and the water outlet branch pipes of all the single membranes converge into the water outlet main pipe, and one water outlet electromagnetic valve is arranged on each water outlet branch pipe; the pressure sensor and the turbidity detector are arranged on the water outlet main pipe in sequence along the water flow direction; the other side of each single membrane is connected with the membrane pollution control device; The main control box is connected with the control ends of all the water outlet electromagnetic valves; the main control box is used for controlling whether each single membrane produces water by controlling the water outlet electromagnetic valves; The signal output end of the turbidity detector is connected with the main control box; the turbidity detector is used for monitoring the water turbidity value of the membrane assembly in real time; the main control box is used for judging whether the single membrane or the multiple membranes in the electromagnetic valve opening state has a damage condition according to the obtained water turbidity value when the one-by-one patrol or the two-division patrol is adopted; if the damaged membrane is found, the water outlet electromagnetic valve corresponding to the damaged membrane is closed, and the damaged membrane is replaced after waiting for the opportunity; the damaged single membrane is determined by using the one-by-one patrol mode, specifically including: the single membrane is patrolled by using the one-by-one patrol mode when the filtration is started or after the filtration is operated for a preset time; the rotating speed of the water outlet pipeline pump is reduced to 1 / n of the preset operating speed; wherein n is the number of the single membranes contained in the membrane assembly; the water outlet electromagnetic valve corresponding to the to-be-detected membrane is opened, the water outlet electromagnetic valves corresponding to the single membranes other than the to-be-detected membrane are closed, and the water turbidity value of the to-be-detected single membrane is collected at the same time; the single membrane with the water turbidity value greater than a preset turbidity threshold value is determined as the damaged single membrane; The signal output end of the pressure sensor is connected with the main control box; the pressure sensor is used for monitoring the transmembrane pressure difference of the membrane assembly in real time; the main control box is further used for opening the water outlet electromagnetic valves of the single membranes one by one when the one-by-one patrol is adopted, and judging whether the transmembrane pressure difference of the single membrane in the water outlet electromagnetic valve opening state exceeds a set value; if the transmembrane pressure difference exceeds the set value, it indicates that the single membrane is polluted; The main control box is connected with the control end of the membrane pollution control device; the main control box is further used for opening the membrane pollution control device to clean the polluted single membrane; The membrane pollution control device comprises a water backwashing main pipe, a plurality of water backwashing branch pipes, a plurality of water backwashing electromagnetic valves, a plurality of aeration pipes and a plurality of pneumatic electromagnetic valves; The other side of each single membrane is connected with one water backwashing branch pipe, and all the water backwashing branch pipes are connected with the water backwashing main pipe; one water backwashing electromagnetic valve is arranged on each water backwashing branch pipe; the control ends of all the water backwashing electromagnetic valves are connected with the main control box; A plurality of aeration pipes are uniformly distributed on the bottom of the membrane pool along the membrane arrangement direction, and one aeration pipe corresponds to 1-3 membranes; one pneumatic electromagnetic valve is connected with each aeration pipe; the control ends of all the pneumatic electromagnetic valves are connected with the main control box; The main control box is used for controlling the pneumatic electromagnetic valves to perform the membrane cleaning program of the fixed-point aeration or controlling the water backwashing electromagnetic valves to perform the membrane cleaning program of the fixed-point water backwashing or performing both at the same time, so as to clean the polluted single membrane, and the normal membrane continues to operate at the same time.

2. The dual straggling detection device for a single membrane of a water treatment membrane module assembly according to claim 1, characterized by, The double-patrol device of the single membrane further comprises a membrane state display device. The film state display device comprises a plurality of color lights with variable colors; One color light is arranged on each single film; control ends of the plurality of color lights are connected with a master control box; the master control box is used for controlling the color lights to emit light with a color corresponding to a current state of the single film; the state is normal, damaged or contaminated.

3. A double patrol method of a single membrane of a water treatment membrane module assembly, characterized by, The single film maintenance method comprises: The damaged single film is determined by means of one-by-one inspection or dichotomy inspection; the damaged single film is determined by means of one-by-one inspection, specifically comprising: when the filtration is started or after the filtration is operated for a preset time, the single film is inspected by means of one-by-one inspection; the rotating speed of the outlet pipeline pump is reduced to 1 / n of a preset operating speed; wherein n is the number of single films contained in the membrane module; the outlet electromagnetic valve corresponding to the single film to be detected is opened, and the outlet electromagnetic valves corresponding to the single films other than the single film to be detected are closed, and the outlet turbidity value of the single film to be detected is collected; the single film with the outlet turbidity value greater than a preset turbidity threshold value is determined as the damaged single film; The outlet electromagnetic valve of the damaged single film is closed, and the damaged single film is removed from the membrane module and replaced with a new single film; The transmembrane pressure difference value of each single film is measured by means of one-by-one inspection; The single film with the transmembrane pressure difference value greater than the filtration transmembrane pressure difference is determined as the contaminated single film; The outlet electromagnetic valve of the contaminated single film is closed, and the point membrane contamination control is performed to clean the contaminated single film, and the normal single film continues to operate.

4. The method of claim 3, wherein, The transmembrane pressure difference value of each single film is measured by means of one-by-one inspection, specifically comprising: When the filtration is started or after the filtration is operated for a preset time, the single film is inspected by means of one-by-one inspection; The rotating speed of the outlet pipeline pump is reduced to 1 / n of a preset operating speed; wherein n is the number of single films contained in the membrane module; The outlet electromagnetic valve corresponding to the single film to be detected is opened, and the outlet electromagnetic valves corresponding to the single films other than the single film to be detected are closed, and the transmembrane pressure difference value of the single film to be detected is collected.

5. The method of claim 3, wherein, The damaged single film is determined by means of dichotomy inspection, specifically comprising: The rotating speed of the outlet pipeline pump is reduced to m / n of a preset operating speed, and the outlet electromagnetic valves corresponding to m groups of single films to be detected are opened, and the outlet electromagnetic valves corresponding to the single films other than the m groups of single films to be detected are closed; wherein n is the number of single films contained in the membrane module; when n is even, m = n / 2; when n is odd, m = (n+1) / 2 or m = (n-1) / 2; The outlet turbidity values of the m groups of single films to be detected are collected; If the outlet turbidity values of the m groups of single films to be detected are greater than a preset turbidity threshold value, the m groups of single films to be detected are detected again by means of dichotomy inspection, the value of n is updated to the value of m, and step "the rotating speed of the outlet pipeline pump is reduced to m / n of a preset operating speed, and the outlet electromagnetic valves corresponding to m groups of single films to be detected are opened, and the outlet electromagnetic valves corresponding to the single films other than the m groups of single films to be detected are closed" is returned until the damaged single film is found. If the turbidity of the water discharged from the m groups of single membranes is less than or equal to the membrane group turbidity threshold, it is determined that there is no damaged single membrane in the m groups of single membranes, and the n-m groups of single membranes other than the m groups of single membranes need to be detected, the detection is continued in the way of dichotomy inspection, the value of n is updated to the value of n-m, and the step of "reducing the rotation speed of the water outlet pipeline pump to the preset running speed of m / n, while opening the water outlet electromagnetic valve corresponding to the m groups of single membranes to be detected, and closing the water outlet electromagnetic valve corresponding to the single membranes other than the m groups of single membranes" is returned, until the damaged single membrane is found.

6. The method of claim 3, wherein the method is a double pass method. The fixed-point membrane pollution control mode for cleaning the contaminated single membrane is fixed-point aeration cleaning, or fixed-point water backwashing, or fixed-point aeration cleaning and fixed-point water backwashing.

7. The method of claim 6, wherein, The water backwashing specifically includes: closing the water outlet electromagnetic valve of the contaminated single membrane, while opening the water backwashing electromagnetic valve corresponding to the contaminated single membrane; determining the rotation speed of the water backwashing pump according to the number of contaminated single membranes; opening the water backwashing pump and making the water backwashing pump run at the determined rotation speed.

8. The method of claim 6, wherein the method is a double pass method for a single membrane of a water treatment membrane module assembly, and wherein the method comprises: The fixed-point aeration cleaning specifically includes: closing the water outlet electromagnetic valve of the contaminated single membrane, opening the pneumatic electromagnetic valve of the aeration pipe corresponding to the position of the contaminated single membrane, and opening the air compressor; determining the value of the gas flow meter according to the required aeration amount, and controlling the gas flow according to the determined value of the gas flow meter.

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