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

Abstract

The application discloses an integrated membrane element maintenance device with a self-monitoring function and a control method thereof. The device comprises a maintenance unit, a monitoring and dosing unit and a maintenance liquid circulating unit. The maintenance unit comprises a first maintenance tank and a second maintenance tank which are isolated from each other, so that multiple types of membrane elements can be simultaneously maintained. The monitoring and dosing unit comprises a control system, a medicament tank, a medicament conveying assembly and a monitoring assembly. The medicament tank stores medicaments required for the maintenance of the membrane elements. The medicament tank is connected with the maintenance unit through the medicament conveying assembly. The monitoring assembly is arranged in the maintenance unit to monitor the physicochemical indexes of the maintenance liquid and feed data information to the control system. The control system sends control instructions to automatically dose the medicaments into the maintenance unit. The maintenance liquid circulating unit is connected with the control system and the maintenance unit to automatically realize the circulation of the maintenance liquid. The application has the characteristics of compact structure, high automation degree and wide application range.

Description

Technical Field

[0001] This invention relates to the field of membrane element maintenance technology, and specifically to an integrated membrane element maintenance device with self-monitoring function and its control method. Background Technology

[0002] Membranes are widely used in the wastewater treatment industry. During long-term use, membrane element maintenance is crucial for ensuring proper replacement and reuse of existing membrane elements. Since the desalination layer of a membrane element may experience irreversible water flux loss and a decrease in desalination rate after drying, the main purpose of membrane maintenance is to ensure that the membrane element remains in a consistently moist environment. Furthermore, because membrane elements filter wastewater, microbial growth is likely to occur inside them. Therefore, chemicals must be added to inhibit or kill microorganisms and prevent their proliferation from affecting the permeate flux. The wastewater treatment industry uses various types of membrane elements, mainly including ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, and DTRO membrane sheets. Reverse osmosis and nanofiltration membranes, which are primarily made of polyamide, require maintenance with a 1% (wt%) sodium bisulfite solution, while tubular ultrafiltration membranes, which are primarily made of polyvinylidene fluoride, require a 2 mg / L sodium hypochlorite solution. Due to the different sizes of different types of membrane elements and the variations in membrane maintenance solutions, different types of membrane maintenance devices cannot be used interchangeably, significantly increasing the cost of membrane maintenance equipment.

[0003] As the membrane maintenance time increases, the effective components of the maintenance solution gradually decompose, requiring the agent to be replenished or the maintenance solution to be replaced from time to time. Manual addition cannot guarantee the concentration of the maintenance solution or provide real-time feedback on the status of the maintenance agent. If the maintenance agent is not replenished in time, it may lead to the failure of the maintenance solution or the effective concentration being too low, which will affect the subsequent performance of the membrane element. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an integrated membrane element maintenance device and its control method with self-monitoring function that is compact in structure, easy to operate and widely applicable, in order to overcome the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An integrated membrane element maintenance device with self-monitoring function includes: a maintenance unit, a monitoring and dosing unit, and a maintenance solution circulation unit. The maintenance unit includes a first maintenance tank and a second maintenance tank, which are isolated from each other. The first and second maintenance tanks are containers for maintaining the membrane elements, and each is equipped with a removable partition to allow simultaneous maintenance of multiple types of membrane elements. The monitoring and dosing unit includes a control system, a reagent tank, a reagent delivery assembly, and a monitoring assembly. The reagent tank stores the reagents required for membrane element maintenance and is connected to the first and second maintenance tanks via the reagent delivery assembly. The monitoring assembly is located in the first and second maintenance tanks to monitor the physicochemical properties of the maintenance solution and feed the data back to the control system. The control system sends control commands to the reagent tank and the reagent delivery assembly to automatically add reagents to the first and second maintenance tanks. The maintenance solution circulation unit is connected to the control system, the first and second maintenance tanks, and the control system controls the operation of the maintenance solution circulation unit to automatically maintain the circulation of the maintenance solution in the first and second maintenance tanks.

[0007] As a further improvement of the present invention, the maintenance unit further includes a first connecting valve, a first venting valve, a second venting valve, and a second connecting valve; the first venting valve is disposed in the first maintenance box and is connected to the control system signal, the second venting valve is disposed in the second maintenance box and is connected to the control system signal; the first maintenance box and the second maintenance box 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.

[0008] As a further improvement of the present invention, the pharmaceutical delivery assembly includes a first screw feeder and a second screw feeder, wherein the first screw feeder is connected to a pharmaceutical tank and a first maintenance tank respectively, and the second screw feeder is connected to a pharmaceutical tank and a second maintenance tank respectively; the pharmaceuticals stored in the pharmaceutical tank are sodium hypochlorite dry solution and sodium bisulfite dry solution respectively.

[0009] As a further improvement of the present invention, the monitoring components include a pH and conductivity monitoring component and a residual chlorine and conductivity monitoring component, wherein the pH and conductivity monitoring component is disposed in a second maintenance chamber and the residual chlorine and conductivity monitoring component is disposed in a first maintenance chamber.

[0010] As a further improvement of the present invention, the maintenance fluid circulation unit includes a first circulation pump, a first filter, a level gauge, a second filter, a second circulation pump, a first water supply valve, and a second water supply valve; both the first maintenance tank and the second maintenance tank are equipped with level gauges; 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 pipelines of the first maintenance tank and 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.

[0011] As a general technical concept, the present invention also provides a control method for the integrated membrane element maintenance device with self-monitoring function described above, including liquid level control of the first maintenance tank and the second maintenance tank, circulation control of the maintenance solution, water exchange 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 dosing control, and maintenance mode switching control.

[0012] 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 less 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.

[0013] 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 the limit value, triggering the water replacement of the first maintenance tank or the second maintenance tank, opening the drain valve, opening the water replenishment valve when the liquid level reaches 0.1m, and stopping after replenishing water to 1.1m.

[0014] As a further improvement of the present invention, the pH control of the second maintenance box includes: the pH and conductivity monitoring component transmits pH value data to the control system every 10 seconds, the control system calculates the average pH value every minute, if the pH is lower than 3, the discharge valve of the medicine box is opened, the first screw feeder puts the medicine into the second maintenance box, and the medicine addition is turned off when the subsequent single-minute detection data pH>4.

[0015] 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, the control system calculates the average value every minute, if the average residual chlorine value is lower than 2 mg / L, the discharge valve of the agent tank is opened, and the second screw feeder feeds the agent into the first maintenance tank, and the agent addition is turned off when the subsequent single-minute detection data reaches 2 mg / L or higher.

[0016] As a further improvement of the present invention, the maintenance mode switching control 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, so as to realize the switching of different maintenance modes.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] 1. The integrated membrane element maintenance device and its control method with self-monitoring function of the present invention uses a first maintenance tank and a second maintenance tank that are isolated from each other and operate independently as containers for membrane element maintenance. The maintenance tanks are also equipped with removable partitions, enabling simultaneous maintenance of multiple different types of membrane elements. Simultaneously, a monitoring and dosing unit is formed by a control system, a reagent tank, a reagent delivery component, and a monitoring component. The monitoring component feeds back relevant physicochemical data of the maintenance solution in the maintenance tanks to the control system, which then controls the operation of the reagent tank and the reagent delivery component, thus achieving rapid and convenient addition of reagents to the maintenance tanks, effectively demonstrating reagent efficacy and significantly saving manpower. Furthermore, the control system controls the operation of the maintenance solution circulation unit, ensuring automatic circulation of the maintenance solution in the first and second maintenance tanks. The present invention establishes an automated membrane element maintenance device that automatically controls reagent replenishment based on monitoring data in the maintenance tanks and sets timed maintenance solution replacements, achieving automated monitoring and operation of membrane maintenance.

[0019] 2. The integrated membrane element maintenance device and control method with self-monitoring function of the present invention utilizes the pH value change of sodium bisulfite solution and the residual chlorine change of sodium hypochlorite solution after long-term maintenance to control the addition of chemicals, and uses conductivity to measure the turbidity of the water in the maintenance tank, thereby ensuring the cleanliness of the water in the maintenance tank. This achieves automatic monitoring of membrane maintenance, and the control system automatically adds chemicals and replenishes water according to the monitoring indicators. The added filtration system ensures the interception of pollutants, greatly saving manpower and ensuring the stability of membrane maintenance. At the same time, the maintenance device of the present invention is also suitable for the maintenance of reverse osmosis, nanofiltration, ultrafiltration, DTRO membranes, etc. in other wastewater treatment, with a wide range of applications. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the overall structural principle of the integrated membrane element maintenance device in a specific embodiment of the present invention;

[0021] 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 components; 9. Level gauge; 10. Residual chlorine and conductivity monitoring components; 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 membrane; 20. Second connecting valve; 21. First water supply valve; 22. Second water supply valve. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0025] Example

[0026] like Figure 1As shown, the integrated membrane element maintenance device with self-monitoring function of the present invention includes: a maintenance unit, a monitoring and dosing unit, and a maintenance solution circulation unit. The maintenance unit includes a first maintenance tank 16 and a second maintenance tank 17 isolated from each other. The first maintenance tank 16 and the second maintenance tank 17 are containers for membrane element maintenance, and both the first maintenance tank 16 and the second maintenance tank 17 are equipped with removable partitions to enable simultaneous maintenance of multiple types of membrane elements. The monitoring and dosing unit includes a control system 3, a reagent tank 4, a reagent delivery assembly, and a monitoring assembly. The reagent tank 4 is used to store the reagents required for membrane element maintenance, and the reagent tank 4 is connected to the first maintenance tank 16 and the second maintenance tank 17 via the reagent delivery assembly. The monitoring assembly is located in the first maintenance tank 16 and the second maintenance tank 17 to monitor the physicochemical properties of the maintenance solution and feed the 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 add reagents to the first maintenance tank 16 and the second maintenance tank 17. The maintenance fluid circulation unit is connected to the control system 3, the first maintenance tank 16, and the second maintenance tank 17, respectively. The control system 3 controls the operation of the maintenance fluid circulation unit to automatically maintain the circulation of maintenance fluid in the first maintenance tank 16 and the second maintenance tank 17. Specifically, the control system 3 can be a PLC control system, which is simple in principle, convenient to operate, and provides precise control.

[0027] In this embodiment, one device can meet the storage requirements of membrane elements of different sizes. The device can be adapted to different membrane types by adjusting the distribution of maintenance areas, pipeline routing, and drug supply type according to the membrane type.

[0028] like Figure 1 As shown, the maintenance unit also includes a first connecting valve 7, a first vent valve 15, a second vent valve 18, and a second connecting valve 20. The first vent valve 15 is located in the first maintenance box 16 and is connected to the control system 3 via a signal connection. The second vent valve 18 is located in the second maintenance box 17 and is also connected to the control system 3 via a signal connection. The first maintenance box 16 and the second maintenance box 17 are connected via a circulation pipeline with the first connecting valve 7 and the second connecting valve 20 to switch the maintenance mode according to the type of membrane element.

[0029] 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 tank 4 and the first maintenance tank 16, respectively, and the second screw feeder 6 is connected to the reagent tank 4 and the second maintenance tank 17, respectively. The reagents stored in the reagent tank 4 are sodium hypochlorite dry solution and sodium bisulfite dry solution, which facilitates quantitative dosing.

[0030] 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 installed in the second maintenance tank 17, and the residual chlorine and conductivity monitoring component 10 is installed in the first maintenance tank 16. By utilizing the changes in pH value after long-term maintenance with sodium bisulfite solution and the changes in residual chlorine after long-term maintenance with sodium hypochlorite solution, the addition of reagents is controlled, and conductivity is used to measure the degree of turbidity in the water in the maintenance tank, thereby ensuring the cleanliness of the water in the maintenance tank.

[0031] like Figure 1 As shown, the maintenance fluid circulation unit includes a first circulation pump 1, a first filter 2, a level gauge 9, a second filter 11, a second circulation pump 14, a first water supply valve 21, and a second water supply valve 22; both the first maintenance tank 16 and the second maintenance tank 17 are equipped with level gauges 9. The first water supply valve 21, the second circulation pump 14, and the second filter 11 are located on the circulation pipeline of the first maintenance tank 16, and the second water supply valve 22, the first circulation pump 1, and the first filter 2 are located on the circulation pipeline of the second maintenance tank 17. The circulation pipelines of the first maintenance tank 16 and the second maintenance tank 17 are connected through a first connecting valve 7 and a second connecting valve 20. The use of filters in the circulation pipelines effectively removes impurities generated during the maintenance process, purifies the water quality, and maintains the stability of the maintenance fluid. The first circulation pump 1, the second circulation pump 14, the first water supply valve 21, and the second water supply valve 22 are all connected to the control system 3 for signal transmission to achieve automatic control.

[0032] In this embodiment, a control method based on the above-mentioned integrated membrane element maintenance device is also provided, including liquid level control of the first maintenance tank 16 and the second maintenance tank 17, circulation control of the maintenance solution, water exchange 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 dosing control, and maintenance mode switching control.

[0033] The liquid level control of the first maintenance tank 16 and the second maintenance tank 17 includes: the liquid level gauge 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 gauge 9 is lower than 1m, water replenishment is started. When the liquid level height fed back by the liquid level gauge 9 reaches 1.1m, water replenishment is stopped. pH and conductivity detection are stopped during water replenishment.

[0034] The water change control for the first maintenance tank 16 and the second maintenance tank 17 includes the following: when the conductivity monitoring of the first maintenance tank 16 or the second maintenance tank 17 reaches the limit, the water in the first maintenance tank 16 or the second maintenance tank 17 is replaced by opening the drain valve. When the liquid level reaches 0.1m, the water replenishment valve is opened, and water is replenished to 1.1m before stopping. During water replenishment, pH and conductivity monitoring are stopped. Specifically, if the average conductivity of the water in the second maintenance tank 17 is higher than 15ms / cm or the conductivity of the water in the first maintenance tank 16 is higher than 5ms / cm, the drain valve of the corresponding tank is opened for drainage.

[0035] The pH control of the second maintenance tank 17 includes: the pH and conductivity monitoring component 8 transmits pH 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 is greater than 4 in subsequent single-minute tests.

[0036] 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, the control system 3 calculates the average value every minute, and if the average residual chlorine value is lower than 2 mg / L, the discharge valve of the agent tank 4 is opened, and the second screw feeder 6 puts the agent into the first maintenance tank 16. The agent addition is turned off when the subsequent single-minute detection data reaches 2 mg / L or higher.

[0037] The maintenance mode switching 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 that needs maintenance, so as to achieve the switching of different maintenance modes.

[0038] Specifically, when all maintenance is performed on ultrafiltration membrane 13, the removable partition between the first maintenance box 16 and the second maintenance box 17 is manually removed, and the ultrafiltration membrane 13 is placed in the first maintenance box 16 and the second maintenance box 17. The control system 3 switches to the sodium hypochlorite maintenance mode. The control system 3 controls the opening of the first connecting valve 7 on the side of the first maintenance box 16 and the second connecting valve 20 at the water inlet of the first maintenance box 16 and the second maintenance box 17. The control system 3 first monitors whether the liquid level meets the requirements based on the data information fed back by the level gauge 9. According to the liquid level, the first water supply valve 21 and the second water supply valve 22 are opened. 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 dosing control and the second circulation pump 14 are activated. The flow rate of the second circulation pump 14 is maintained at 5m³ / h.

[0039] When all reverse osmosis membranes 12 are being maintained, a partition is installed between the first maintenance tank 16 and the second maintenance tank 17, separating the first maintenance tank 16 and the second maintenance tank 17 into three 1.2m long storage areas. The control system 3 switches to the sodium bisulfite maintenance mode. The control system 3 controls the opening of the first connecting valve 7 on the side of the first maintenance tank 16 and the second connecting valve 20 at the inlet of the first maintenance tank 16 and the second maintenance tank 17. The control system 3 first monitors whether the liquid level has reached the required level based on the data information fed back by the level gauge 9. According to the liquid level, the first water supply valve 21 and the second water supply valve 22 are opened. When the water supply level reaches 1.1m, the water supply valves are automatically closed. After the water supply is completed, the pH and conductivity monitoring component 8 is turned on, and the sodium bisulfite reagent addition control and the first circulation pump 1 are turned on. The flow rate of the first circulation pump 1 is maintained at 5m³ / h.

[0040] When the reverse osmosis membrane 12, ultrafiltration membrane 13, DTRO membrane 19, and nanofiltration membrane are maintained simultaneously, the second maintenance box 17 is divided into three storage areas: a DTRO membrane storage area, a reverse osmosis membrane storage area, and a nanofiltration membrane storage area. Membrane rods for storing the DTRO membranes are installed and bolted to the bottom of the box. After completion, the nanofiltration membrane, reverse osmosis membrane 12, and DTRO membrane 19 are placed in the designated areas. All partitions in the first maintenance box 16 are removed, and the ultrafiltration membrane 13 is placed inside. The control system 3 switches to the mixed maintenance mode. The control system 3 first monitors whether the liquid level meets the requirements based on the data information fed back by the liquid level gauge 9. According to the liquid level, the first water supply valve 21 and the second water supply valve 22 are opened. When the water supply level reaches 1.1m, the water supply valves are automatically closed. After the water supply valves are closed, the pH and conductivity monitoring component 8 and the residual chlorine and conductivity monitoring component 10 are opened. The dosing control of sodium bisulfite and sodium hypochlorite is started and circulated with the first circulation pump 1 and the second circulation pump 14. The flow rate of the first circulation pump 1 and the second circulation pump 14 is maintained at 5m³ / h.

[0041] In this embodiment, the pH changes of sodium bisulfite solution and the residual chlorine changes of sodium hypochlorite solution after long-term maintenance are used to control the addition of chemicals, and conductivity is used to measure the turbidity of the water in the maintenance tank, thereby ensuring the cleanliness of the water in the maintenance tank. This achieves automatic monitoring of membrane maintenance, and the control system automatically adds chemicals and replenishes water according to the monitoring indicators. The addition of a filtration system ensures the retention of pollutants, greatly saving manpower and ensuring the stability of membrane maintenance. At the same time, the maintenance device of this invention is also suitable for the maintenance of reverse osmosis, nanofiltration, ultrafiltration, DTRO membranes, etc. in other wastewater treatment, and has a wide range of applications.

[0042] 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 embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing 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: The system comprises a maintenance unit, a monitoring and dosing unit, and a maintenance solution circulation unit. The maintenance unit includes a first maintenance tank (16) and a second maintenance tank (17) that are isolated from each other. The first maintenance tank (16) and the second maintenance tank (17) are containers for maintaining membrane elements, and both the first maintenance tank (16) and the second maintenance tank (17) are equipped with removable partitions to enable simultaneous maintenance of multiple types of membrane elements. The monitoring and dosing unit includes a control system (3), a reagent tank (4), a reagent delivery assembly, and a monitoring assembly. The reagent tank (4) is used to store the reagents required for membrane element maintenance. The reagent tank (4) is connected to the first maintenance tank (16) and the second maintenance tank (17) via a reagent delivery assembly. The agent delivery assembly is connected, and the monitoring assembly is set in the first maintenance tank (16) and the second maintenance tank (17) to monitor the physicochemical properties of the maintenance solution and feed the data information back to the control system (3). The control system (3) sends control commands to the agent tank (4) and the agent delivery assembly to realize the automatic addition of the agent to the first maintenance tank (16) and the second maintenance tank (17). The maintenance solution circulation unit is connected to the control system (3), the first maintenance tank (16) and the second maintenance tank (17) respectively. The control system (3) controls the operation of the maintenance solution circulation unit to realize the automatic circulation of the maintenance solution in the first maintenance tank (16) and the second maintenance tank (17). The maintenance unit further includes a first connecting valve (7), a first vent valve (15), a second vent valve (18), and a second connecting valve (20); the first vent valve (15) is located in the first maintenance box (16) and is connected to the control system (3) by signal; the second vent valve (18) is located in the second maintenance box (17) and is connected to the control system (3) by signal; the first maintenance box (16) and the second maintenance box (17) are connected by a circulation pipeline with the first connecting valve (7) and the second connecting valve (20) to switch the maintenance mode according to the type of membrane element; 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 installed in the second maintenance box (17), and the residual chlorine and conductivity monitoring component (10) is installed in the first maintenance box (16).

2. The integrated membrane element maintenance device with self-monitoring function according to claim 1, characterized in that, The pharmaceutical delivery assembly includes a first screw feeder (5) and a second screw feeder (6). The first screw feeder (5) is connected to the pharmaceutical tank (4) and the first maintenance tank (16) respectively. The second screw feeder (6) is connected to the pharmaceutical tank (4) and the second maintenance tank (17) respectively. The pharmaceuticals stored in the pharmaceutical tank (4) are sodium hypochlorite dry agent and sodium bisulfite dry agent.

3. The integrated membrane element maintenance device with self-monitoring function according to claim 1, characterized in that, The maintenance fluid circulation unit includes a first circulation pump (1), a first filter (2), a level gauge (9), a second filter (11), a second circulation pump (14), a first water supply valve (21), and a second water supply valve (22). The first maintenance tank (16) and the second maintenance tank (17) are each equipped with a level gauge (9). The first water supply valve (21), the second circulation pump (14), and the second filter (11) are located on the circulation pipeline of the first maintenance tank (16). The second water supply valve (22), the first circulation pump (1), and the first filter (2) are located on the circulation pipeline of the second maintenance tank (17). The circulation pipeline of the first maintenance tank (16) and the circulation pipeline of the second maintenance tank (17) are connected through the first connecting valve (7) and the second connecting valve (20). The first circulation pump (1), the second circulation pump (14), the first water supply valve (21), and the second water supply valve (22) are all connected to the control system (3) via signals.

4. A control method for an integrated membrane element maintenance device with self-monitoring function according to any one of claims 1 to 3, characterized in that, This includes level control of the first maintenance tank (16) and the second maintenance tank (17), circulation control of the maintenance solution, water exchange 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 dosing control, and maintenance mode change control.

5. The control method according to claim 4, characterized in that, The liquid level control of the first maintenance tank (16) and the second maintenance tank (17) includes: the liquid level gauge (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 gauge (9) is less than 1m, water replenishment is started. When the liquid level height fed back by the liquid level gauge (9) reaches 1.1m, water replenishment is stopped.

6. The control method according to claim 4, characterized in that, The water replacement control of the first maintenance tank (16) and the second maintenance tank (17) includes: when the conductivity monitoring of the first maintenance tank (16) or the second maintenance tank (17) reaches the limit, the water in the first maintenance tank (16) or the second maintenance tank (17) is triggered to replace the water, the drain valve is opened, the water supply valve is opened when the liquid level reaches 0.1m, and the water supply stops after reaching 1.1m.

7. The control method according to claim 4, characterized in that, The pH control of the second maintenance tank (17) includes: the pH and conductivity monitoring component (8) transmits pH data to the control system (3) every 10 seconds, the control system (3) calculates the average pH value every minute, and if the pH is lower than 3, the discharge valve of the agent tank (4) is opened, and the first screw feeder (5) puts the agent into the second maintenance tank (17), and the agent addition is turned off when the subsequent single-minute detection data pH>4; The residual chlorine control of the first maintenance box (16) includes: the residual chlorine and conductivity monitoring component (10) transmits conductivity data to the control system (3) every 10 seconds, the control system (3) calculates the average value every minute, and if the average residual chlorine value is lower than 2 mg / L, the discharge valve of the agent box (4) is opened, and the second screw feeder (6) puts the agent into the first maintenance box (16), and the agent addition is turned off when the subsequent single-minute detection data reaches more than 2 mg / L.

8. The control method according to claim 4, characterized in that, The maintenance mode switching 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 achieve the switching of different maintenance modes.

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