High-recovery-rate reverse osmosis device suitable for reclaimed water treatment and recovery

Abstract

The utility model relates to the technical field of water treatment, and provides a high-recovery-rate reverse osmosis device suitable for reclaimed water treatment and recovery, which comprises a water inlet pipeline, a first-section membrane group, a second-section membrane group, a third-section membrane group and a control system for realizing integral linkage, a filtering assembly is arranged inside the water inlet pipeline, a water producing port of the first-section membrane module is fixedly connected with a water producing main pipe, a concentrated water port of the water inlet pipeline is fixedly connected with a first-section concentrated water pipe, one end, far away from the first-section membrane module, of the first-section concentrated water pipe is connected with a water inlet of the second-section membrane module, and a water producing port of the second-section membrane module is fixedly connected with a second-section water producing pipe. According to the technical scheme, the problems that in the prior art, once substances are generated and accumulated, the water yield of reverse osmosis is remarkably reduced, the chemical cleaning period is shortened, and the stability and the cleaning restorability of the system are greatly shortened, so that the economical efficiency and the stability are greatly reduced are solved.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a high recovery rate reverse osmosis device suitable for the treatment and recycling of greywater. Background Technology

[0002] In the application of reverse osmosis (RO) in industrial water treatment and reuse, and advanced municipal wastewater treatment, membrane fouling is an unavoidable problem. For this type of fine-treatment process, traditional pretreatment methods cannot comprehensively cover all fouling components, including hardness scaling. Traditional processes control hardness scaling by using upstream chemical precipitation and ion exchange resins, along with the addition of antiscalants. However, this approach is limited by operating costs, system complexity, and the availability of chemicals. In high-recovery-rate RO systems, the hardness at the end of multi-stage RO units often reaches over 2000 mg / L. Such high hardness leads to the formation of scaling substances such as calcium sulfate and calcium fluoride. Once these substances form and accumulate, the RO permeate flow rate decreases significantly, the chemical cleaning cycle shortens, and the system's stability and recovery time are greatly reduced, resulting in a significant decrease in economic efficiency and stability. This further restricts the design and application of high-recovery-rate RO systems. Utility Model Content

[0003] This invention proposes a high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling, which solves the problem in related technologies that once substances are generated and accumulate, the reverse osmosis water production will decrease significantly, the chemical cleaning cycle will be shortened, and the system's stability and cleaning recovery will be greatly reduced, resulting in a significant reduction in economy and stability.

[0004] The technical solution of this utility model is as follows: A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling includes an inlet pipe, a first membrane module, a second membrane module, and a third membrane module, and a control system for achieving overall linkage. The inlet pipe is connected to the inlet of the first membrane module, and a filter assembly is installed inside the inlet pipe. The product water inlet of the first membrane module is fixedly connected to a main product water pipe. The concentrate inlet of the inlet pipe is fixedly connected to a section of concentrate pipe, and the end of the concentrate pipe furthest from the first membrane module is connected to the inlet of the second membrane module. The product water inlet of the second membrane module is fixedly connected to two sections of product water pipe, and the two sections of product water pipe are furthest from the first membrane module. One end of the second membrane module is connected to the permeate main pipe. The concentrate outlet of the second membrane module is fixedly connected to two sections of concentrate double-pass pipe. The two ends of the two sections of concentrate double-pass pipe are respectively fixedly connected to a concentrate outlet pipe and a water supply pipe. The end of the water supply pipe away from the two sections of concentrate double-pass pipe is connected to the inlet of the third membrane module. The permeate outlet of the third membrane module is fixedly connected to three sections of permeate pipe. The end of the three sections of permeate pipe away from the third membrane module is connected to the permeate main pipe. The concentrate outlet of the third membrane module is fixedly connected to three sections of concentrate pipe, and the end of the three sections of concentrate pipe away from the three sections of permeate pipe is connected to the concentrate outlet pipe. A cleaning component is installed on the third membrane module.

[0005] Preferably, the cleaning assembly includes a cleaning pump, a clean water filter, and a cleaning water tank. A diversion branch pipe A is fixedly connected to the outlet of the cleaning pump and the cleaning filter, and the end of the diversion branch pipe A away from the cleaning pump and the cleaning filter is connected to the water supply pipe. A diversion branch pipe B and a diversion branch pipe C are fixedly connected to the return inlet of the cleaning water tank, and the end of the diversion branch pipe B away from the cleaning water tank is connected to the three-section product water pipe. The end of the diversion branch pipe C away from the cleaning water tank is connected to the three-section concentrate pipe.

[0006] Preferably, the control system includes a controller, solenoid valve A, solenoid valve B, solenoid valve C, and solenoid valve D. Solenoid valve A and solenoid valve B are respectively installed on the outside of the concentrate outlet pipe and the water supply pipe. Solenoid valve C is installed on the outside of the three-section product water pipe. Solenoid valve D is installed on the outside of the three-section concentrate pipe. Solenoid valve E is installed at the end of the drainage branch pipe A near solenoid valve B. Solenoid valve F is installed at the end of the drainage branch pipe B near solenoid valve C. Solenoid valve G is installed at the end of the drainage branch pipe C near solenoid valve D.

[0007] Preferably, the filter assembly includes a filter screen, a collection cylinder, an electric push rod, a mounting plate, and a sealing plate. The filter screen is fixedly connected inside the inlet pipe, and the collection cylinder is fixedly connected to the outside of the filter screen. An electric push rod is fixedly connected to one end of the collection cylinder, and the mounting plate is fixedly connected to the output end of the electric push rod. A sealing plate is fixedly connected to one end of the mounting plate, and a liquid spray pipe is fixedly connected to the top of the sealing plate. One end of the liquid spray pipe extends to the outside of the collection cylinder and is slidably connected to the collection cylinder. A drive motor is fixedly connected to one end of the mounting plate. A central shaft is fixedly connected to the output end of the drive motor. Multiple eccentric striking plates are fixedly connected to the outer side of the central shaft. A notch is provided at the bottom end of the water inlet pipe at a position corresponding to the anti-pollution mesh plate. A sealing arc plate is connected to the notch through a rotating shaft. A guide seat is fixedly connected to one end of the sealing arc plate. An extension seat is also fixedly connected to the outer side of the water inlet pipe. A hydraulic rod is rotatably connected to one end of the extension seat, and the output end of the hydraulic rod is rotatably connected to one end of the guide seat.

[0008] Preferably, both the inlet and concentrate outlet of the first and second membrane modules are equipped with manual valve A, which serves as the inlet valve for chemical cleaning and the concentrate return valve. A manual valve B is installed on the outside of the concentrate pipe, which serves as the chemical cleaning permeate return valve for the first and second membrane modules.

[0009] Preferably, the inlet, product water outlet, and concentrate outlet of the third membrane module are all equipped with remote pressure gauges, and the solenoid valves A, B, C, D, E, F, and G, as well as the remote pressure gauges, are all electrically connected to the controller.

[0010] Preferably, the cleaning water tank is also equipped with a water replenishment pipe, a hydrochloric acid pipe, and a sodium hydroxide pipe.

[0011] Preferably, the liquid nozzle has multiple water outlet holes on its outer side, and each water outlet hole is fixedly connected to a water nozzle at an incline.

[0012] The working principle and beneficial effects of this utility model are as follows:

[0013] 1. Through the overall structural design, this utility model enables high-frequency, automated, and independent chemical cleaning of the third-stage membrane module. This allows for the early maintenance chemical cleaning of hard scale and organic contaminants, effectively slowing down the fouling process of the third-stage membrane module. At the same time, the independent cleaning process of the third-stage membrane module does not interfere with the normal operation of the first and second-stage membrane modules, which have relatively lower levels of fouling. This achieves continuous and uninterrupted operation, greatly improving the operating efficiency of the entire reverse osmosis system and enabling long-term continuous and stable operation.

[0014] 2. Compared with the traditional two-stage reverse osmosis device, the recovery rate of this utility model is higher; compared with the traditional three-stage reverse osmosis device, its operation stability is better; and compared with the high-flow-rate circulating reverse osmosis device, its energy consumption is lower. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the assembly structure of the filter component of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the storage tube of this utility model;

[0019] Figure 4 This is a schematic diagram of the assembly structure of the central shaft and the eccentric striking plate of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the sealing arc plate of this utility model;

[0021] Figure 6 The influent water quality for a wastewater treatment plant's wastewater reuse project that meets discharge standards.

[0022] In the diagram: 1. Inlet pipe; 2. First membrane module; 3. Second membrane module; 4. Third membrane module; 5. Permeate main pipe; 6. First concentrate pipe; 7. Second permeate pipe; 8. Second concentrate double-pass pipe; 9. Concentrate outlet pipe; 10. Supply pipe; 11. Third permeate pipe; 12. Third concentrate pipe; 13. Cleaning assembly; 14. Drainage branch pipe A; 15. Drainage branch pipe B; 16. Drainage branch pipe C; 17. Solenoid valve A; 8. Solenoid valve B; 19. Solenoid valve C; 20. Solenoid valve D; 21. Solenoid valve E; 22. Solenoid valve F; 23. Solenoid valve G; 24. Barrier mesh plate; 25. Storage cylinder; 26. Electric push rod; 27. Mounting plate; 28. Sealing plate; 29. ​​Liquid nozzle; 30. Drive motor; 31. Central shaft; 32. Eccentric impact plate; 33. Sealing arc plate; 34. Guide seat; 35. Extension seat; 36. Hydraulic rod. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0024] Example 1

[0025] like Figures 1-5 As shown, this embodiment proposes a high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling, including an inlet pipe 1, a first membrane module 2, a second membrane module 3, and a third membrane module 4, and a control system for overall linkage. The inlet pipe 1 is connected to the inlet of the first membrane module 2, and a filter assembly is installed inside the inlet pipe 1. The permeate outlet of the first membrane module 2 is fixedly connected to a permeate main pipe 5. The concentrate outlet of the inlet pipe 1 is fixedly connected to a concentrate pipe 6, and the end of the concentrate pipe 6 away from the first membrane module 2 is connected to the inlet of the second membrane module 3. The permeate outlet of the second membrane module 3 is fixedly connected to a second permeate pipe 7, and the second permeate pipe 7 is away from the second membrane module 3. One end of the membrane module 3 is connected to the main water supply pipe 5. The concentrate outlet of the second membrane module 3 is fixedly connected to a two-section concentrate double-pass pipe 8. The two ends of the two-section concentrate double-pass pipe 8 are respectively fixedly connected to a concentrate outlet pipe 9 and a water supply pipe 10. The end of the water supply pipe 10 away from the two-section concentrate double-pass pipe 8 is connected to the inlet of the third membrane module 4. The product water outlet of the third membrane module 4 is fixedly connected to a three-section product water pipe 11. The end of the three-section product water pipe 11 away from the third membrane module 4 is connected to the main water supply pipe 5. The concentrate outlet of the third membrane module 4 is fixedly connected to a three-section concentrate pipe 12. The end of the three-section concentrate pipe 12 away from the three-section product water pipe 11 is connected to the concentrate outlet pipe 9. A cleaning component 13 is provided on the third membrane module 4.

[0026] Furthermore, both the inlet and concentrate outlet of the first membrane module 2 and the second membrane module 3 are equipped with manual valve A. Manual valve A serves as the inlet valve for chemical cleaning and the concentrate return valve. A manual valve B is installed on the outside of a concentrate pipe 6. Manual valve B serves as the chemical cleaning permeate return valve for the first membrane module 2 and the second membrane module 3.

[0027] The cleaning assembly 13 includes a cleaning pump, a clean water filter, and a cleaning water tank. A drain branch pipe A14 is fixedly connected to the outlet of the cleaning pump and the cleaning filter. The end of the drain branch pipe A14 away from the cleaning pump and the cleaning filter is connected to the water supply pipe 10. A drain branch pipe B15 and a drain branch pipe C16 are fixedly connected to the return inlet of the cleaning water tank. The end of the drain branch pipe B15 away from the cleaning water tank is connected to the three-section product water pipe 11. The end of the drain branch pipe C16 away from the cleaning water tank is connected to the three-section concentrate pipe 12.

[0028] Preferably, the cleaning water tank is also equipped with a water supply pipe, a hydrochloric acid pipe, and a sodium hydroxide pipe;

[0029] The control system includes a controller, solenoid valves A17, B18, C19, and D20. Solenoid valves A17 and B18 are respectively installed on the outside of the concentrate outlet pipe 9 and the water supply pipe 10. Solenoid valves C19 and D20 are installed on the outside of the three-section product water pipe 11. Solenoid valve D20 is installed on the outside of the three-section concentrate pipe 12. Solenoid valve E21 is installed at the end of the drainage branch pipe A14 near solenoid valve B18. Solenoid valve F22 is installed at the end of the drainage branch pipe B15 near solenoid valve C19. Solenoid valve G23 is installed at the end of the drainage branch pipe C16 near solenoid valve D20.

[0030] In this example, solenoid valve E21 serves as the inlet valve for the chemical cleaning of the third membrane module 4.

[0031] Solenoid valve F22 serves as the permeate return valve for the chemical cleaning of the third-stage membrane module 4.

[0032] Solenoid valve G23 serves as the concentrate return valve for the chemical cleaning of the third-stage membrane module 4.

[0033] In detail, remote pressure gauges are installed on the inlet, product water outlet and concentrate outlet of the third membrane module 4, and solenoid valves A17, B18, C19, D20, E21, F22 and G23 and the remote pressure gauges are all electrically connected to the controller.

[0034] In detail, the controller is a PLC system or a DCS system, and the controller has an embedded automatic operation program;

[0035] Example 2

[0036] like Figures 1-5 As shown, based on the same concept as Embodiment 1 above, this embodiment also proposes a filtering component;

[0037] In this embodiment, the filter assembly includes a barrier mesh 24, a collection cylinder 25, an electric push rod 26, a mounting plate 27, and a sealing plate 28. The barrier mesh 24 is fixedly connected inside the water inlet pipe 1, and the collection cylinder 25 is fixedly connected to the outside of the barrier mesh 24. One end of the collection cylinder 25 is fixedly connected to the electric push rod 26, and the output end of the electric push rod 26 is fixedly connected to the mounting plate 27. One end of the mounting plate 27 is fixedly connected to the sealing plate 28, and the top of the sealing plate 28 is fixedly connected to a liquid spray pipe 29. One end of the liquid spray pipe 29 extends to the outside of the collection cylinder 25 and slides with the collection cylinder 25. Next, a drive motor 30 is fixedly connected to one end of the mounting plate 27, and a central shaft 31 is fixedly connected to the output end of the drive motor 30. Multiple eccentric striking plates 32 are fixedly connected to the outside of the central shaft 31. A notch is opened at the bottom of the water inlet pipe 1 at the position corresponding to the impurity blocking mesh plate 24. A sealing arc plate 33 is connected to the notch through a rotating shaft. A guide seat 34 is fixedly connected to one end of the sealing arc plate 33. An extension seat 35 is also fixedly connected to the outside of the water inlet pipe 1. A hydraulic rod 36 is rotatably connected to one end of the extension seat 35, and the output end of the hydraulic rod 36 is also rotatably connected to one end of the guide seat 34.

[0038] Here, multiple water outlet holes are provided on the outer side of the liquid nozzle 29, and each water outlet hole is fixedly connected to a water nozzle at an incline.

[0039] In detail, sealing gaskets are provided on the outer side of the sealing disc 28 and the outer side of the sealing arc plate 33.

[0040] Example 3

[0041] A chemical plant's wastewater treatment plant has achieved standard discharge and is undergoing a reclaimed water reuse project. The influent water quality is as follows: Figure 6 .

[0042] The effluent quality meets the requirements for circulating water makeup in GB19923-2005 "Water Quality Standard for Industrial Water Use in Urban Wastewater Reuse". Due to the existing industrial water source, the process adopted is a heat exchanger + pre-filter + self-cleaning filter + hollow fiber ultrafiltration device + reverse osmosis device. The reverse osmosis device and its supporting chemical cleaning device adopt this utility model. The reverse osmosis device is designed with a recovery rate of 85% and a designed production capacity of 100 m³ / h. According to design calculations, the hardness (calculated as CaCO₃) of the concentrate from the third stage membrane module of the reverse osmosis device will reach 3250 mg / L. Combined with the sulfate content, this exceeds the solubility of calcium sulfate. Conventional designs have extremely short three-stage cleaning cycles, requiring frequent chemical cleaning.

[0043] After adopting this patent, the pressure difference limit of the third membrane module 4 in this project is 0.1MPa. It operates continuously for 24 hours a day. The first state, that is, the three-stage simultaneous operation state, has an operation cycle of about 30 hours. The second state is the cleaning of the three-stage membrane module, the operation state of the first and second stage membrane modules, and the third state. The chemical replacement cycle is about 3 hours. This reverse osmosis device has been operating stably for 3 years. The reverse osmosis membrane elements have not been replaced. To date, the water production is ≥100m3 / h and the desalination rate is ≥97%.

[0044] A specific application of the above embodiment is as follows: In normal operation, the first state is in which the first membrane module 2, the second membrane module 3, and the third membrane module 4 operate simultaneously: solenoid valves B18, C19, and D20 are open, while solenoid valves A17, E21, F22, and G23 are closed. The program determines the timing of the third membrane module 4 based on the pressure difference from the remote pressure gauge. As the third membrane module 4 becomes more fouled during operation, when the pressure difference reaches a preset value, the program switches to the second state: solenoid valves B18, C19, and D20 are closed. D20 is in the closed state, solenoid valves A17, E21, F22, and G23 are in the open state, and the cleaning pump is running for the duration of the preset value formed during debugging. After the preset value is reached, the program executes the third state, which is to change the medicine, discharge the cleaning fluid, and automatically replenish water and sodium hydroxide. After the end, it re-enters the second state, the cleaning pump runs for the duration of the preset value formed during debugging, and after the preset value is reached, the program executes the third state, discharges the cleaning fluid, and automatically replenishes water and hydrochloric acid. After the end, it re-enters the first state and enters the next operating cycle.

[0045] The liquid nozzle 29 is connected to the external liquid supply pipe beforehand. When the liquid flows into the water inlet pipe 1, the impurity-blocking mesh plate 24 can block suspended matter and particles in the liquid, thus pre-treating the liquid. When the impurity-blocking mesh plate 24 is not effective, the electric push rod 26 is activated to push the mounting plate 27 to move, causing the eccentric striking plate 32 to reach the inside of the water inlet pipe 1. The liquid inside the liquid supply pipe will be sprayed onto the impurity-blocking mesh plate 24 through the liquid nozzle 29 to rinse it. At the same time, the drive motor 30 is activated to drive the central shaft 31 to rotate continuously. With the structural characteristics of the eccentric striking plate 32, the impurity-blocking mesh plate 24 can be struck to shake off the particles blocked at the impurity-blocking mesh plate 24. The hydraulic rod 36 can be activated to pull the guide seat 34. Since the guide seat 34 is supported by the sealing arc plate 33, it can drive the sealing arc plate 33 to rotate, releasing the blockage of the water inlet pipe 1. Thus, the impurities that fall off the impurity-blocking mesh plate 24 can be discharged from the water inlet pipe 1.

[0046] In summary, this invention differs from traditional two-stage or three-stage reverse osmosis devices. It adopts a three-stage membrane module design with lower energy consumption. For the third stage, which has the most serious risks of fouling such as hardness scaling and organic pollution, it achieves high-frequency, automated, and independent chemical cleaning of the third-stage membrane module 4. This provides maintenance chemical cleaning of hardness scaling and organic pollution in the early stages, thereby effectively slowing down the fouling process of the third-stage membrane module 4. At the same time, the independent cleaning process of the third-stage membrane module 4 does not interfere with the normal operation of the first-stage membrane module 2 and the second-stage membrane module 3, which have relatively lower levels of fouling. This enables continuous and uninterrupted operation, thereby greatly improving the operating efficiency of the entire reverse osmosis system and enabling long-term continuous and stable operation.

[0047] Compared with traditional two-stage reverse osmosis devices, it has a higher recovery rate; compared with traditional three-stage reverse osmosis devices, it has better operational stability; compared with high-flow-rate circulating reverse osmosis devices, it has lower energy consumption. In addition, a circulation pump can be added to the third membrane module 4 to further enhance its fouling resistance. In summary, this utility model has the advantages of high recovery rate, stability, economy, fouling resistance and flexibility.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling, characterized in that, The system includes an inlet pipe (1), a first membrane module (2), a second membrane module (3), and a third membrane module (4), and a control system for achieving overall linkage. The inlet pipe (1) is connected to the inlet of the first membrane module (2). A filter assembly is installed inside the inlet pipe (1). The permeate outlet of the first membrane module (2) is fixedly connected to a permeate main pipe (5). The concentrate outlet of the inlet pipe (1) is fixedly connected to a concentrate pipe (6), and the end of the concentrate pipe (6) away from the first membrane module (2) is connected to the inlet of the second membrane module (3). The permeate outlet of the second membrane module (3) is fixedly connected to two permeate pipes (7), and the end of the two permeate pipes (7) away from the second membrane module (3) is connected to the permeate main pipe (5). The concentrate outlet of group (3) is fixedly connected to two sections of concentrate double-pass pipe (8). The two ends of the two sections of concentrate double-pass pipe (8) are respectively fixedly connected to concentrate outlet pipe (9) and water supply pipe (10). The end of the water supply pipe (10) away from the two sections of concentrate double-pass pipe (8) is connected to the inlet of the third membrane group (4). The product water outlet of the third membrane group (4) is fixedly connected to three sections of product water pipe (11). The end of the three sections of product water pipe (11) away from the third membrane group (4) is connected to the main product water pipe (5). The concentrate outlet of the third membrane group (4) is fixedly connected to three sections of concentrate pipe (12). The end of the three sections of concentrate pipe (12) away from the three sections of product water pipe (11) is connected to the concentrate outlet pipe (9). A cleaning component (13) is provided on the third membrane group (4).

2. The high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 1, characterized in that, The cleaning assembly (13) includes a cleaning pump, a clean water filter, and a cleaning water tank. A drain branch pipe A (14) is fixedly connected to the outlet of the cleaning pump and the cleaning filter. The end of the drain branch pipe A (14) away from the cleaning pump and the cleaning filter is connected to the water supply pipe (10). A drain branch pipe B (15) and a drain branch pipe C (16) are fixedly connected to the return inlet of the cleaning water tank. The end of the drain branch pipe B (15) away from the cleaning water tank is connected to the three-section product water pipe (11). The end of the drain branch pipe C (16) away from the cleaning water tank is connected to the three-section concentrate pipe (12).

3. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 2, characterized in that, The control system includes a controller, solenoid valve A (17), solenoid valve B (18), solenoid valve C (19) and solenoid valve D (20). Solenoid valve A (17) and solenoid valve B (18) are respectively installed on the outside of the concentrate outlet pipe (9) and the water supply pipe (10). Solenoid valve C (19) is installed on the outside of the three-section product water pipe (11). Solenoid valve D (20) is installed on the outside of the three-section concentrate pipe (12). Solenoid valve E (21) is installed at the end of the drainage branch pipe A (14) near solenoid valve B (18). Solenoid valve F (22) is installed at the end of the drainage branch pipe B (15) near solenoid valve C (19). Solenoid valve G (23) is installed at the end of the drainage branch pipe C (16) near solenoid valve D (20).

4. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 1, characterized in that, The filter assembly includes a filter screen (24), a collection cylinder (25), an electric push rod (26), a mounting plate (27), and a sealing plate (28). The filter screen (24) is fixedly connected inside the water inlet pipe (1). The collection cylinder (25) is fixedly connected to the outside of the filter screen (24). The electric push rod (26) is fixedly connected to one end of the collection cylinder (25). The mounting plate (27) is fixedly connected to the output end of the electric push rod (26). The sealing plate (28) is fixedly connected to one end of the mounting plate (27). The liquid nozzle (29) is fixedly connected to the top of the sealing plate (28), and one end of the liquid nozzle (29) extends to the outside of the collection cylinder (25) and is slidably connected to the collection cylinder (25). One end of the mounting plate (27) is fixedly connected to a drive motor (30), the output end of the drive motor (30) is fixedly connected to a central shaft (31), and a plurality of eccentric striking plates (32) are fixedly connected to the outside of the central shaft (31). A notch is provided at the bottom of the water inlet pipe (1) at a position corresponding to the anti-pollution mesh plate (24). A sealing arc plate (33) is connected to the notch through a rotating shaft. One end of the sealing arc plate (33) is fixedly connected to a guide seat (34). An extension seat (35) is also fixedly connected to the outside of the water inlet pipe (1). One end of the extension seat (35) is rotatably connected to a hydraulic rod (36), and the output end of the hydraulic rod (36) is also rotatably connected to one end of the guide seat (34).

5. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 1, characterized in that, The inlet and concentrate outlet of the first membrane module (2) and the second membrane module (3) are both equipped with manual valve A. The manual valve A serves as the inlet valve for chemical cleaning and the concentrate return valve. The outside of the concentrate pipe (6) is equipped with manual valve B. The manual valve B serves as the chemical cleaning permeate return valve for the first membrane module (2) and the second membrane module (3).

6. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 3, characterized in that, The inlet, product outlet and concentrate outlet of the third membrane module (4) are all equipped with remote pressure gauges, and the solenoid valves A (17), B (18), C (19), D (20), E (21), F (22) and G (23) and the remote pressure gauges are all electrically connected to the controller.

7. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 2, characterized in that, The cleaning water tank is also equipped with a water replenishment pipe, a hydrochloric acid pipe, and a sodium hydroxide pipe.

8. A high-recovery-rate reverse osmosis device suitable for greywater treatment and recycling according to claim 4, characterized in that, The liquid nozzle (29) has multiple water outlet holes on its outer side, and each water outlet hole is fixedly connected to a water nozzle at an incline.

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