Integrated membrane element maintenance device with self-monitoring function and control method thereof

Abstract

The invention discloses an integrated membrane element maintenance device with a self-monitoring function and a control method of the integrated membrane element maintenance device. The integrated membrane element maintenance device comprises a maintenance unit, a monitoring and dosing unit and a maintenance solution circulating unit, the maintenance unit comprises a first maintenance box and a second maintenance box which are isolated from each other so as to realize simultaneous maintenance of multiple types of membrane elements; the monitoring and dosing unit comprises a control system, a medicament box, a medicament conveying assembly and a monitoring assembly; the agent box stores agents needed by membrane element maintenance, the agent box and the maintenance unit are connected through the agent conveying assembly, the monitoring assembly is arranged in the maintenance unit to monitor physical and chemical indexes of a maintenance solution and feed data information back to the control system, and the control system sends out a control instruction to achieve automatic adding of the agents into the maintenance unit; the maintenance liquid circulation unit is connected with the control system and the maintenance unit so that the maintenance unit can automatically achieve maintenance liquid circulation. The device has the characteristics of compact structure, high automation degree, wide application range and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of membrane element maintenance, and in particular to an integrated membrane element maintenance device with a self-monitoring function and a control method thereof. Background Art

[0002] Membranes are widely used in the wastewater treatment industry. During long-term operation, membrane element maintenance is crucial to ensuring proper element rotation and reuse. Since drying of the desalination layer of a membrane element can lead to irreversible flux loss and a decrease in salt rejection, membrane maintenance primarily aims to maintain a consistently moist environment within the membrane element. Furthermore, as membrane elements filter wastewater, they are susceptible to microbial growth, requiring the addition of agents to inhibit or kill microorganisms and prevent them from impacting water flux. The wastewater treatment industry utilizes a wide variety of membrane elements, primarily ultrafiltration, nanofiltration, reverse osmosis, and DTRO membranes. Polyamide-based membrane elements such as reverse osmosis and nanofiltration require maintenance with a 1% (wt%) sodium bisulfite solution, while membrane elements such as tubular ultrafiltration (PUF) membranes require a 2mg / L sodium hypochlorite solution. Due to the varying sizes of membrane elements and the varying maintenance solutions and agents used, membrane maintenance equipment cannot be universally compatible, significantly increasing maintenance costs.

[0003] As the membrane maintenance time increases, the effective ingredients of the maintenance liquid gradually decompose, and it is necessary to replenish the agent or replace the maintenance liquid from time to time. Manual addition cannot guarantee the configuration concentration of the maintenance liquid and real-time feedback on the status of the maintenance agent. Failure to replenish the maintenance agent in time will cause the maintenance liquid to become ineffective or the effective concentration to be too low, affecting the subsequent performance of the membrane element. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and provide an integrated membrane element maintenance device with a self-monitoring function and a control method thereof, which has a compact structure, is easy to operate and has a wide range of applications.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: An integrated membrane element maintenance device with a self-monitoring function comprises a maintenance unit, a monitoring and dosing unit, and a maintenance fluid circulation unit. The maintenance unit comprises a first maintenance tank and a second maintenance tank, each of which is isolated from each other. The first and second maintenance tanks serve as containers for membrane element maintenance and are each provided with a removable partition to enable simultaneous maintenance of multiple types of membrane elements. The monitoring and dosing unit comprises a control system, a reagent tank, a reagent delivery assembly, and a monitoring assembly. The reagent tanks store reagents required for membrane element maintenance and are connected to the first and second maintenance tanks via the reagent delivery assembly. The monitoring assembly, disposed in the first and second maintenance tanks, monitors the physical and chemical parameters of the maintenance fluid and feeds the data back to the control system. The control system sends control instructions to the reagent tank and the reagent delivery assembly to automatically dosing the reagent into the first and second maintenance tanks. The maintenance fluid circulation unit is connected to the control system, the first and second maintenance tanks, respectively. The control system controls the operation of the maintenance fluid circulation unit to automatically circulate the maintenance fluid in the first and second maintenance tanks. As a further improvement of the present invention, the maintenance unit further includes a first connecting valve, a first drain valve, a second drain valve, and a second connecting valve; the first drain valve is arranged in a first maintenance tank and is connected to a control system signal, and the second drain valve is arranged in a second maintenance tank and is connected to a control system signal; the first maintenance tank and the second maintenance tank are connected through a circulation pipeline with the first connecting valve and the second connecting valve to switch the maintenance mode according to the type of membrane element. As a further improvement of the present invention, the drug delivery assembly includes a first screw feeder and a second screw feeder, the first screw feeder is respectively connected to the drug box and the first maintenance box, and the second screw feeder is respectively connected to the drug box and the second maintenance box; the drugs stored in the drug boxes are dry sodium hypochlorite and dry sodium bisulfite. As a further improvement of the present invention, the monitoring component includes a pH and conductivity monitoring component and a residual chlorine and conductivity monitoring component. The pH and conductivity monitoring component is arranged in the second maintenance box, and the residual chlorine and conductivity monitoring component is arranged in the first maintenance box. As a further improvement of the present invention, the maintenance liquid circulation unit includes a first circulation pump, a first filter, a liquid level gauge, a second filter, a second circulation pump, a first water supply valve and a second water supply valve; the first maintenance tank and the second maintenance tank are both provided with a liquid level gauge, the first water supply valve, the second circulation pump and the second filter are arranged on the circulation pipeline of the first maintenance tank, the second water supply valve, the first circulation pump and the first filter are arranged on the circulation pipeline of the second maintenance tank, and the circulation pipeline of the first maintenance tank and the circulation pipeline of the second maintenance tank are connected through a first connecting valve and a second connecting valve; the first circulation pump, the second circulation pump, the first water supply valve and the second water supply valve are all connected to the control system signal. As a general technical concept, the present invention also provides a control method for the above-mentioned integrated membrane element maintenance device with self-monitoring function, including liquid level control of the first maintenance tank and the second maintenance tank, circulation control of the maintenance liquid, water change control of the first maintenance tank and the second maintenance tank, residual chlorine control of the first maintenance tank, pH control of the second maintenance tank, chemical addition control, and maintenance mode change control. As a further improvement of the present invention, the liquid level control of the first maintenance tank and the second maintenance tank includes: the liquid level gauge feeds back the liquid level information of the first maintenance tank and the second maintenance tank to the control system; if the liquid level height fed back by the liquid level gauge is lower than 1m, water replenishment is started; when the liquid level height fed back by the liquid level gauge reaches 1.1m, water replenishment is stopped. As a further improvement of the present invention, the water replacement control of the first maintenance tank and the second maintenance tank includes: when the conductivity monitoring of the first maintenance tank or the second maintenance tank reaches a limit, triggering the water replacement of the first maintenance tank or the second maintenance tank, opening the drain valve, opening the water supply valve when the liquid level reaches 0.1m, and stopping after the water supply reaches 1.1m. As a further improvement of the present invention, the pH control of the second maintenance tank includes: the pH and conductivity monitoring component transmits pH value data to the control system every 10 seconds, the control system calculates the pH average value once a minute, and if the pH is lower than 3, the discharge valve of the reagent tank is opened, and the first screw feeder feeds the reagent into the second maintenance tank. The reagent feeding is stopped when the pH value of the subsequent single-minute detection data is greater than 4; The residual chlorine control of the first maintenance tank includes: the residual chlorine and conductivity monitoring component transmits conductivity data to the control system every 10 seconds, and the control system calculates the average value once a minute. If the residual chlorine average value is lower than 2 mg / L, the discharge valve of the reagent tank is opened, and the second screw feeder feeds the reagent into the first maintenance tank. The reagent addition is stopped when the subsequent single-minute detection data reaches above 2 mg / L.

[0006] As a further improvement of the present invention, the replacement control of the maintenance mode includes: controlling the operation of the first circulation pump, the first connecting valve, the second circulation pump, and the second connecting valve according to the type of membrane element to be maintained to achieve switching between different maintenance modes. Compared with the prior art, the advantages of the present invention are: 1. The integrated membrane element maintenance device with self-monitoring function and its control method are provided with a first maintenance box and a second maintenance box that are isolated and operate independently as containers for membrane element maintenance, and a detachable partition is provided in the maintenance box, so that multiple different types of membrane elements can be maintained simultaneously. At the same time, a monitoring and dosing unit is composed of a control system, a reagent box, a reagent delivery assembly and a monitoring assembly. The monitoring assembly feeds back relevant physical and chemical data information of the maintenance liquid in the maintenance box to the control system, and the control system then controls the operation of the reagent box and the reagent delivery assembly, thereby realizing the addition of reagent into the maintenance box. This is fast and convenient, can effectively reflect the efficacy of the reagent, and greatly saves human resources. Furthermore, the control system controls the operation of the maintenance liquid circulation unit to ensure the automatic circulation of the maintenance liquid in the first maintenance box and the second maintenance box. The present invention establishes an automated membrane element maintenance device, which automatically controls the replenishment of reagents and sets the scheduled maintenance liquid replacement based on the monitoring data in the maintenance box, thereby achieving the purpose of automated monitoring and automated operation of membrane maintenance.

[0007] 2. The present invention's integrated membrane element maintenance device with self-monitoring capabilities and its control method utilize changes in pH and residual chlorine in sodium bisulfite and sodium hypochlorite solutions after long-term maintenance to control reagent dosage. Conductivity is used to measure the turbidity of the water within the maintenance tank, ensuring water cleanliness. This enables automatic monitoring of membrane maintenance, and, in conjunction with a control system, automatically performs reagent addition and water replenishment based on monitoring indicators. The addition of a filtration system ensures pollutant retention, significantly saving manpower while ensuring stable membrane maintenance. The present maintenance device is also suitable for maintaining other wastewater treatment processes, such as reverse osmosis, nanofiltration, ultrafiltration, and DTRO membranes, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the overall structural principle of an integrated membrane element maintenance device in a specific embodiment of the present invention; Legend: 1. First circulation pump; 2. First filter; 3. Control system; 4. Chemical tank; 5. First screw feeder; 6. Second screw feeder; 7. First connecting valve; 8. pH and conductivity monitoring assembly; 9. Liquid level gauge; 10. Residual chlorine and conductivity monitoring assembly; 11. Second filter; 12. Reverse osmosis membrane; 13. Ultrafiltration membrane; 14. Second circulation pump; 15. First drain valve; 16. First maintenance tank; 17. Second maintenance tank; 18. Second drain valve; 19. DTRO diaphragm; 20. Second connecting valve; 21. First water supply valve; 22. Second water supply valve. DETAILED DESCRIPTION

[0009] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0010] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0011] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0012] Example like Figure 1As shown, the integrated membrane element maintenance device with self-monitoring functions of the present invention comprises a maintenance unit, a monitoring and dosing unit, and a maintenance fluid circulation unit. The maintenance unit comprises a first maintenance tank 16 and a second maintenance tank 17, which are isolated from each other. These first and second maintenance tanks 16, 17 serve as membrane element maintenance containers. Both are equipped with removable partitions to enable simultaneous maintenance of multiple types of membrane elements. The monitoring and dosing unit comprises a control system 3, a reagent tank 4, a reagent delivery assembly, and a monitoring assembly. The reagent tank 4 stores the reagents required for membrane element maintenance and is connected to the first and second maintenance tanks 16, 17 via the reagent delivery assembly. The monitoring assembly, located in the first and second maintenance tanks 16, 17, monitors the physical and chemical parameters of the maintenance fluid and feeds this data back to the control system 3. The control system 3 sends control commands to the reagent tank 4 and the reagent delivery assembly to automatically dosing the reagents into the first and second maintenance tanks 16, 17. The maintenance fluid circulation unit is connected to the control system 3, the first maintenance tank 16, and the second maintenance tank 17. The control system 3 controls the operation of the maintenance fluid circulation unit to automatically circulate the maintenance fluid in the first and second maintenance tanks 16, 17. Specifically, the control system 3 can be a PLC control system, which features simple principles, convenient operation, and precise control. In this embodiment, one device can meet the preservation requirements of membrane elements of different specifications and sizes. The maintenance area allocation, pipeline direction, and drug supply type in the maintenance device are adjusted according to the membrane type to adapt to the maintenance of different membrane types.

[0013] like Figure 1 As shown, the maintenance unit further includes a first connecting valve 7, a first drain valve 15, a second drain valve 18, and a second connecting valve 20. The first drain valve 15 is disposed in a first maintenance tank 16 and is signal-connected to the control system 3. The second drain valve 18 is disposed in a second maintenance tank 17 and is signal-connected to the control system 3. The first and second maintenance tanks 16, 17 are connected via a circulation line with the first connecting valve 7 and the second connecting valve 20, enabling switching of maintenance modes depending on the type of membrane element.

[0014] In this embodiment, the reagent delivery assembly includes a first screw feeder 5 and a second screw feeder 6. The first screw feeder 5 is connected to the reagent box 4 and the first maintenance box 16, respectively. The second screw feeder 6 is connected to the reagent box 4 and the second maintenance box 17, respectively. The reagent box 4 stores dry sodium hypochlorite and dry sodium bisulfite, respectively, for easy quantitative dosing.

[0015] In this embodiment, the monitoring components include a pH and conductivity monitoring component 8 and a residual chlorine and conductivity monitoring component 10. The pH and conductivity monitoring component 8 is disposed in a second maintenance tank 17, while the residual chlorine and conductivity monitoring component 10 is disposed in a first maintenance tank 16. Chemical dosage is controlled by utilizing changes in the pH value of a sodium bisulfite solution and the residual chlorine value of a sodium hypochlorite solution after long-term maintenance. Conductivity is used to measure the turbidity of the water within the maintenance tank, thereby ensuring water cleanliness within the maintenance tank.

[0016] like Figure 1 As shown, the maintenance fluid circulation unit includes a first circulation pump 1, a first filter 2, a liquid level gauge 9, a second filter 11, a second circulation pump 14, and first and second water supply valves 21 and 22. Liquid level gauges 9 are installed in both the first and second maintenance tanks 16 and 17. The first and second water supply valves 21 and 21 are located in the circulation piping of the first maintenance tank 16, while the second water supply valve 22, the first circulation pump 1, and the first filter 2 are located in the circulation piping of the second maintenance tank 17. The circulation piping of the first and second maintenance tanks 16 and 17 is interconnected via a first and second connecting valves 7 and 20. The use of filters in the circulation piping effectively removes impurities generated during the maintenance process, purifies the water quality, and maintains the stability of the maintenance fluid. The first and second circulation pumps 14, the first and second water supply valves 21 and 22 are all connected to a control system 3 for automatic control.

[0017] This embodiment also provides a control method based on the above-mentioned integrated membrane element maintenance device, including liquid level control of the first maintenance tank 16 and the second maintenance tank 17, circulation control of the maintenance liquid, water replacement control of the first maintenance tank 16 and the second maintenance tank 17, residual chlorine control of the first maintenance tank 16, pH control of the second maintenance tank 17, chemical addition control, and maintenance mode change control.

[0018] Liquid level control for the first and second maintenance tanks 16, 17 involves the following: Liquid level gauge 9 feeds back liquid level information from the first and second maintenance tanks 16, 17 to the control system 3. If the liquid level gauge 9 indicates a value below 1 meter, water replenishment is initiated. When the liquid level gauge 9 indicates a value above 1.1 meters, water replenishment is stopped. pH and conductivity monitoring are also stopped during water replenishment.

[0019] The water replacement control for the first and second maintenance tanks 16, 17 involves triggering a water replacement in the first or second maintenance tank 16, 17 when the conductivity monitoring limit is reached. The drain valve opens, and the fill valve opens when the liquid level reaches 0.1 m. The fill valve continues to open when the water level reaches 1.1 m. During the fill period, pH and conductivity monitoring ceases. Specifically, if the average conductivity of the water in the second maintenance tank 17 exceeds 15 ms / cm, or if the average conductivity of the water in the first maintenance tank 16 exceeds 5 ms / cm, the drain valve in the corresponding tank opens to drain the water.

[0020] The pH control of the second maintenance tank 17 includes the following steps: the pH and conductivity monitoring component 8 transmits pH value data to the control system 3 every 10 seconds. The control system 3 calculates the average pH value every minute. If the pH is lower than 3, the discharge valve of the reagent tank 4 is opened, and the first screw feeder 5 feeds the reagent into the second maintenance tank 17. The reagent feeding is stopped when the pH value of the subsequent single-minute detection data is greater than 4.

[0021] Residual chlorine control in the first maintenance tank 16 includes the following steps: the residual chlorine and conductivity monitoring assembly 10 transmits conductivity data to the control system 3 every 10 seconds. The control system 3 calculates the average value every minute. If the average residual chlorine value is less than 2 mg / L, the discharge valve of the reagent tank 4 is opened, and the second screw feeder 6 releases the reagent into the first maintenance tank 16. The reagent addition is stopped until the subsequent single-minute detection data reaches or exceeds 2 mg / L.

[0022] The maintenance mode replacement control includes: controlling the operation of the first circulation pump 1, the first connecting valve 7, the second circulation pump 14, and the second connecting valve 20 according to the type of membrane element to be maintained, so as to realize the switching of different maintenance modes.

[0023] Specifically, when all the ultrafiltration membranes 13 are maintained, the detachable partition between the first maintenance tank 16 and the second maintenance tank 17 is manually removed, and the ultrafiltration membrane 13 is placed in the first maintenance tank 16 and the second maintenance tank 17. The control system 3 switches to the sodium hypochlorite maintenance mode. The control system 3 controls the first connecting valve 7 connecting the sides of the first maintenance tank 16 and the second maintenance tank 17 and the second connecting valve 20 at the water inlet end of the first maintenance tank 16 and the second maintenance tank 17 to open. The control system 3 first monitors whether the liquid level meets the requirements based on the data information feedback from the liquid level meter 9, and opens the first water supply valve 21 and the second water supply valve 22 according to the liquid level situation. When the water supply level reaches 1.1m, the water supply valve is automatically closed. After the valve is closed, the residual chlorine and conductivity monitoring component 10 is opened, and the sodium hypochlorite agent addition control and the second circulation pump 14 circulation are started. The flow rate of the second circulation pump 14 is maintained at 5m³ / h.

[0024] When all reverse osmosis membranes 12 are being maintained, a partition is installed between first maintenance tank 16 and second maintenance tank 17, separating first maintenance tank 16 and second maintenance tank 17 into three 1.2-meter-long storage areas. Control system 3 switches to sodium bisulfite maintenance mode and opens first connecting valve 7 connecting the first and second maintenance tanks 16 and 17, as well as second connecting valve 20 at the water inlet ends of first and second maintenance tanks 16 and 17. Control system 3 first monitors whether the liquid level meets the required level based on data feedback from liquid level gauge 9 and opens first and second water supply valves 21 and 22 accordingly. When the water supply level reaches 1.1 m, the water supply valves are automatically closed. After water supply is completed, pH and conductivity monitoring assembly 8 is activated, and sodium bisulfite dosage control and circulation by first circulation pump 1 are activated, with the flow rate of first circulation pump 1 maintained at 5 m³ / h.

[0025] When the reverse osmosis membrane 12, ultrafiltration membrane 13, DTRO membrane 19, and nanofiltration membrane are being maintained simultaneously, the second maintenance tank 17 is separated into a DTRO membrane storage area, a reverse osmosis membrane storage area, and a nanofiltration membrane storage area using partitions. The DTRO membrane storage rod is installed and bolted to the tank body at the bottom. After completion, the nanofiltration membrane, reverse osmosis membrane 12, and DTRO membrane 19 are placed in the fixed area. The partitions in the first maintenance tank 16 are removed, and the ultrafiltration membrane 13 is placed. The control system 3 switches to the mixed maintenance mode. The control system 3 first monitors whether the liquid level meets the requirement based on the data information fed back by the liquid level meter 9, and opens the first water supply valve 21 and the second water supply valve 22 according to the liquid level situation. When the water supply level reaches 1.1m, the water supply valve is automatically closed. After the water supply valve is closed, the pH and conductivity monitoring component 8 and the residual chlorine and conductivity monitoring component 10 are opened, and the addition control of the two reagents of sodium bisulfite and sodium hypochlorite and the circulation of the first circulation pump 1 and the second circulation pump 14 are started. The flow rate of the first circulation pump 1 and the second circulation pump 14 is maintained at 5m³ / h.

[0026] In this embodiment, changes in the pH value of a sodium bisulfite solution and the residual chlorine content of a sodium hypochlorite solution after long-term maintenance are used to control chemical dosage. Conductivity is used to measure the turbidity of the water within the maintenance tank, thereby ensuring water cleanliness. This enables automated monitoring of membrane maintenance, and a control system automatically performs chemical addition and water replenishment based on monitoring indicators. The addition of a filtration system ensures pollutant retention, significantly saving manpower while ensuring stable membrane maintenance. The maintenance device of this invention is also suitable for maintaining other wastewater treatment processes, such as reverse osmosis, nanofiltration, ultrafiltration, and DTRO membranes, and has a wide range of applications.

[0027] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An integrated membrane element maintenance device with self-monitoring function, characterized in that: include: A maintenance unit, a monitoring and dosing unit and a maintenance liquid circulation unit; the maintenance unit comprises a first maintenance box (16) and a second maintenance box (17) which are isolated from each other, the first maintenance box (16) and the second maintenance box (17) being containers for membrane element maintenance, and the first maintenance box (16) and the second maintenance box (17) are both provided with detachable partitions to achieve simultaneous maintenance of various types of membrane elements; the monitoring and dosing unit comprises a control system (3), a medicine box (4), a medicine delivery component and a monitoring component; the medicine box (4) is used to store medicines required for membrane element maintenance, and the medicine box (4) is connected to the first maintenance box (16) and the second maintenance box (17) through medicine. The monitoring component is arranged in the first maintenance tank (16) and the second maintenance tank (17) to monitor the physical and chemical indicators of the maintenance liquid and feed back the data information to the control system (3). The control system (3) sends a control instruction to the medicine box (4) and the medicine delivery component to realize automatic addition of the medicine into the first maintenance tank (16) and the second maintenance tank (17). The maintenance liquid circulation unit is respectively connected to the control system (3), the first maintenance tank (16) and the second maintenance tank (17). The control system (3) controls the operation of the maintenance liquid circulation unit to realize automatic circulation of the maintenance liquid in the first maintenance tank (16) and the second maintenance tank (17).

2. The integrated membrane element maintenance device with self-monitoring function according to claim 1, characterized in that: The maintenance unit further comprises a first connecting valve (7), a first drain valve (15), a second drain valve (18) and a second connecting valve (20); the first drain valve (15) is arranged in a first maintenance tank (16) and is connected to a control system (3) by signal, and the second drain valve (18) is arranged in a second maintenance tank (17) and is connected to a control system (3) by signal; the first maintenance tank (16) and the second maintenance tank (17) are connected via a circulation pipeline having the first connecting valve (7) and the second connecting valve (20) so as to switch the maintenance mode according to the type of the membrane element.

3. The integrated membrane element maintenance device with self-monitoring function according to claim 2, characterized in that: The medicine conveying assembly comprises a first screw feeder (5) and a second screw feeder (6); the first screw feeder (5) is connected to a medicine box (4) and a first maintenance box (16), respectively; the second screw feeder (6) is connected to a medicine box (4) and a second maintenance box (17), respectively; the medicines stored in the medicine box (4) are dry sodium hypochlorite and dry sodium bisulfite.

4. The integrated membrane element maintenance device with self-monitoring function according to claim 3, characterized in that: The monitoring component comprises a pH and conductivity monitoring component (8) and a residual chlorine and conductivity monitoring component (10); the pH and conductivity monitoring component (8) is arranged in a second maintenance box (17), and the residual chlorine and conductivity monitoring component (10) is arranged in a first maintenance box (16).

5. The integrated membrane element maintenance device with self-monitoring function according to claim 4, characterized in that: The maintenance liquid circulation unit comprises a first circulation pump (1), a first filter (2), a liquid level gauge (9), a second filter (11), a second circulation pump (14), a first water replenishment valve (21) and a second water replenishment valve (22); the first maintenance tank (16) and the second maintenance tank (17) are both provided with a liquid level gauge (9); the first water replenishment valve (21), the second circulation pump (14) and the second filter (11) are arranged on the circulation pipeline of the first maintenance tank (16); the second water replenishment valve (22), the first circulation pump (1) and the first filter (2) are arranged on the circulation pipeline of the second maintenance tank (17); and the circulation pipeline of the first maintenance tank (16) and the circulation pipeline of the second maintenance tank (17) are connected via a first connecting valve (7) and a second connecting valve (20); the first circulation pump (1), the second circulation pump (14), the first water replenishment valve (21) and the second water replenishment valve (22) are all connected to the control system (3) by signals.

6. A control method for the integrated membrane element maintenance device with self-monitoring function according to any one of claims 1 to 5, characterized in that: The system comprises liquid level control of the first maintenance tank (16) and the second maintenance tank (17), circulation control of maintenance liquid, water replacement control of the first maintenance tank (16) and the second maintenance tank (17), residual chlorine control of the first maintenance tank (16), pH control of the second maintenance tank (17), agent dosing control and maintenance mode replacement control.

7. The control method according to claim 6, characterized in that: The liquid level control of the first maintenance tank (16) and the second maintenance tank (17) comprises: the liquid level meter (9) feeds back the liquid level information of the first maintenance tank (16) and the second maintenance tank (17) to the control system (3); if the liquid level height fed back by the liquid level meter (9) is lower than 1 m, water replenishment is started; when the liquid level height fed back by the liquid level meter (9) reaches 1.1 m, water replenishment is stopped.

8. The control method according to claim 6, characterized in that: The water replacement control of the first maintenance tank (16) and the second maintenance tank (17) comprises: when the conductivity monitoring of the first maintenance tank (16) or the second maintenance tank (17) reaches a limit value, triggering the water replacement of the first maintenance tank (16) or the second maintenance tank (17), opening the drain valve, and opening the water replenishment valve when the liquid level reaches 0.1m, and stopping after the water replenishment reaches 1.1m.

9. The control method according to claim 6, characterized in that: The pH control of the second maintenance tank (17) includes: the pH and conductivity monitoring component (8) transmits pH value data to the control system (3) every 10 seconds, and the control system (3) calculates the pH average value once a minute. If the pH is lower than 3, the discharge valve of the reagent box (4) is opened, and the first screw feeder (5) feeds the reagent into the second maintenance tank (17). When the pH value of the subsequent single-minute detection data is greater than 4, the reagent feeding is closed; The residual chlorine control of the first maintenance tank (16) includes: the residual chlorine and conductivity monitoring component (10) transmits conductivity data to the control system (3) every 10 seconds, and the control system (3) calculates the average value once a minute. If the residual chlorine average value is lower than 2 mg / L, the discharge valve of the reagent box (4) is opened, and the second screw feeder (6) feeds the reagent into the first maintenance tank (16). When the subsequent single-minute detection data reaches more than 2 mg / L, the reagent addition is closed.

10. The control method according to claim 6, characterized in that: The replacement control of the maintenance mode comprises: controlling the operation of the first circulation pump (1), the first connecting valve (7), the second circulation pump (14), and the second connecting valve (20) according to the type of membrane element to be maintained, so as to realize switching between different maintenance modes.

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