Reclaimed water recycling device and recycling method adopting double-membrane method

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a double-membrane reclaimed water recycling device and a recycling method.The double-membrane reclaimed water recycling device comprises a support and an ultrafiltration membrane tank arranged in the support, a reverse osmosis membrane tank is fixed in the support, a settling tank is fixed in the support, a water storage tank is fixed in the support, and the double-membrane reclaimed water recycling device further comprises a tubular ultrafiltration membrane, a water storage tank and a water storage tank, the ultrafiltration membrane tank is fixed in the ultrafiltration membrane tank; the tubular reverse osmosis membrane is fixed in the reverse osmosis membrane tank; the wastewater is efficiently treated; when to-be-treated water is in a normal working state, the cleaning float bowl is driven by water pressure to move up and down in the tubular ultrafiltration membrane and the tubular reverse osmosis membrane: on one hand, intercepted substances attached to the wall surfaces of internal channels of the tubular ultrafiltration membrane and the tubular reverse osmosis membrane are scraped by a first cleaning scraping ring, a second cleaning scraping ring and a spiral scraping ring; on the other hand, intercepted objects attached to the scraping rings are washed and cleaned by means of water flow pressure, the intercepted objects are discharged through the spiral drainage channel, and therefore self-cleaning of the cleaning buoy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a double-membrane water recycling device and a recycling method. Background Art

[0002] With the annual increase in industrial wastewater discharge and the increasingly severe water shortage problem, reclaimed water reuse technology has become a key means of achieving water recycling. Dual-membrane technology (ultrafiltration + reverse osmosis), currently the mainstream technology in reclaimed water reuse, is widely used in wastewater treatment scenarios in the chemical, power, and municipal industries due to its high efficiency in retaining suspended solids, colloids, organic matter, and soluble salts. This technology removes large molecular impurities and colloidal particles from the water through the screening action of the ultrafiltration membrane. The selective permeation of the reverse osmosis membrane then deeply purifies small molecular pollutants and ions, ultimately producing water quality that meets reuse standards.

[0003] The inner walls of ultrafiltration and reverse osmosis membranes are prone to fouling due to impurities such as suspended particles, colloids, microbial metabolites, and organic matter in the retained water. These impurities gradually accumulate on the membrane surface and penetrate into the membrane pores, reducing the membrane's effective filtration area and increasing water resistance. This directly manifests as a significant decrease in filtration flux. In severe cases, the membrane may even require downtime and replacement of the membrane assembly, significantly increasing operational costs.

[0004] Existing methods for treating membrane fouling fall into two main categories: offline chemical cleaning and online physical cleaning. However, these methods are limited in their effectiveness in removing stubborn contaminants adhering deep within the membrane's inner wall. This is particularly true for the tubular structures of ultrafiltration and reverse osmosis membranes, where the curvature of the inner wall leads to uneven water flow. Impurities near the ends of the membrane tube are easily removed, while blockage in the central region remains difficult to effectively resolve.

[0005] Existing technologies lack real-time monitoring and dynamic response mechanisms for membrane fouling. Most devices rely on fixed cleaning cycles, making it difficult to adjust cleaning strategies based on actual fouling conditions. When membrane fouling is mild, blind cleaning wastes water and energy; when fouling is severe, delayed cleaning exacerbates membrane performance degradation. Summary of the Invention

[0006] The present invention provides a double-membrane water recycling device, which can achieve efficient wastewater treatment.

[0007] In order to solve the above technical problems, the technical solutions of the present invention are as follows: In a first aspect, a dual-membrane water reuse device comprises: a bracket and an ultrafiltration membrane tank disposed within the bracket, a reverse osmosis membrane tank fixed within the bracket, a sedimentation tank fixed within the bracket, and a water storage tank fixed within the bracket, and further comprises: The tubular ultrafiltration membrane is fixed in the ultrafiltration membrane tank; the tubular reverse osmosis membrane is fixed in the reverse osmosis membrane tank; the cleaning member is slidably arranged in the ultrafiltration membrane tank and the reverse osmosis membrane tank, and is used to clean the retained attachments on the inner walls of the tubular ultrafiltration membrane and the tubular reverse osmosis membrane; the conveying member is respectively fixed to the ultrafiltration membrane tank, the reverse osmosis membrane tank, the sedimentation tank and the water storage tank, and is used to control the flow direction of the water to drive the cleaning member to reciprocate along a predetermined trajectory; Butt joints are fixed on both ends of the ultrafiltration membrane tank and the reverse osmosis membrane tank; The cleaning float is vertically slidably arranged in the butt joint tube, and is vertically slidably arranged in the tubular ultrafiltration membrane and the tubular reverse osmosis membrane, and the upper and lower end surfaces are inclined surfaces; the first cleaning scraper ring is fixed above the cleaning float; the second cleaning scraper ring is fixed below the cleaning float, and the lower end surface is inclined surface; the spiral scraper ring is fixed on the cleaning float, with one end fixed on the first cleaning scraper ring and the other end fixed on the second cleaning scraper ring; The upper and lower end surfaces of the cleaning float are both inclined, the upper end surface of the first cleaning scraper ring is inclined and matched with the upper end inclined surface of the cleaning float, and the lower end surface of the second cleaning scraper ring is inclined and matched with the lower end inclined surface of the cleaning float; The inner wall of the butt-joint pipe and the spiral scraper ring together form a spiral drainage channel.

[0008] Furthermore, the cleaning member further comprises: The piston hole is opened on the cleaning float; the first dredge hole is opened in the cleaning float and is located above the cleaning float; the second dredge hole is opened in the cleaning float and is located below the cleaning float.

[0009] Furthermore, the cleaning member further comprises: A limiting ring is fixed on the piston hole; a first cleaning piston is slidably set in the piston hole; a second cleaning piston is slidably set in the piston hole and is located directly below the first cleaning piston; a spring seat plate is fixed in the piston hole; a cleaning spring has one end fixed on the first cleaning piston and the second cleaning piston, and the other end fixed on the spring seat plate.

[0010] Furthermore, the bracket is fixed with a docking plate; two ultrafiltration membrane tanks are provided, and the two ultrafiltration membrane tanks are located on the same side of the sedimentation tank and the water storage tank; two reverse osmosis membrane tanks are provided, and the two reverse osmosis membrane tanks are located on the same side of the sedimentation tank and the water storage tank, and the reverse osmosis membrane tank is opposite to the ultrafiltration membrane tank.

[0011] Furthermore, a first water ring channel is opened inside the docking tube, the first water ring channel is connected to the first dredge hole, a first dredge pipe is fixed on the outside of the docking tube, a second water ring channel is opened inside the docking tube, the second water ring channel is connected to the second dredge hole, and a second dredge pipe is fixed on the outside of the docking tube.

[0012] Furthermore, the conveying member includes: The water inlet main is located above the bracket; the four-way water inlet pipe is fixed above the water inlet main and fixed on the butt joint pipes above the two ultrafiltration membrane tanks; the first electromagnetic water inlet valve is fixed above the water inlet main; the three-way water inlet pipe has its water inlet end fixed below the water inlet main and its water outlet ends respectively fixed on the butt joint pipes below the two ultrafiltration membrane tanks; the second electromagnetic water inlet valve is fixed below the water inlet main; the first external end cover is threadedly sleeved on the water inlet main.

[0013] Furthermore, the conveying member further comprises: The first sedimentation inlet pipe, both ends of which are fixed on the butt joints above the two ultrafiltration membrane tanks, both ends of which are fixed on the butt joints above the two reverse osmosis membrane tanks, and are connected to the first dredge pipe; the first sewage pipe, which is fixed on both ends of the first sedimentation inlet pipe; the first solenoid valve, which is fixed on both ends of the first sedimentation inlet pipe, and is fixed on the first sewage pipe; the second sedimentation inlet pipe, both ends of which are fixed on the butt joints below the two ultrafiltration membrane tanks, both ends of which are fixed on the butt joints below the two reverse osmosis membrane tanks, and are connected to the second dredge pipe; the second sewage pipe, which is fixed on both ends of the second sewage pipe; the second solenoid valve, which is fixed on both ends of the second sedimentation inlet pipe, and is fixed on the second sewage pipe; the sedimentation main pipe, one end of which is fixed on the first sedimentation inlet pipe and the second sedimentation inlet pipe, and the other end is fixed on the sedimentation tank.

[0014] Furthermore, the conveying member further comprises: The water supply pipe is fixed under the water tank; the first booster pump has a pump base fixed under the water tank and a working end fixed on the water supply pipe; the first electromagnetic water supply valve is fixed above the water supply pipe; the first water supply tee has a water inlet end fixed above the water supply pipe, and both water outlet ends are respectively fixed on the butt joints above the two reverse osmosis membrane tanks; the second electromagnetic water supply valve is fixed under the water supply pipe; the second water supply tee has a water inlet end fixed under the water supply pipe, and both water outlet ends are respectively fixed on the butt joints below the two reverse osmosis membrane tanks.

[0015] Furthermore, the conveying member further comprises: One end of the sedimentation return pipe is inserted into the sedimentation tank, and the other end is fixed on the four-way water inlet pipe; the second booster pump, the pump seat is fixed above the sedimentation tank, and the working end is fixed on the sedimentation return pipe; the electromagnetic return valve is fixed on the sedimentation return pipe; the sludge discharge pipe is fixed below the sedimentation tank; the electromagnetic sludge valve is fixed on the sludge discharge pipe; the return water pipe is fixed on the reverse osmosis membrane tank; the second external end cover is threaded onto the return water pipe; the water inlet booster pump, the pump seat is fixed on the bracket; the flow sensor is fixed on the four-way water inlet pipe and the three-way water inlet pipe, and fixed on the first water supply tee and the second water supply tee; the pressure sensor is fixed on the four-way water inlet pipe and the three-way water inlet pipe, and fixed on the first water supply tee and the second water supply tee; the water transfer pipe, one end is fixed in the middle of the ultrafiltration membrane tank, and the other end is fixed above the water storage tank.

[0016] In a second aspect, a method for recycling water from a double-membrane process device is provided, wherein the steps of the recycling method are as follows: Step S1: Start the water inlet booster pump, open the first electromagnetic water inlet valve, close the second electromagnetic water inlet valve, and allow the water to be purified to enter the tubular ultrafiltration membrane of the ultrafiltration membrane tank through the water inlet main pipe and the four-way water inlet pipe. Under the action of water pressure, part of the water passes through the tubular ultrafiltration membrane to form purified water, and then flows into the water storage tank through the water transfer pipe. The remaining retained water pushes the first cleaning piston of the cleaning float downward and enters the sedimentation tank through the first dredging hole, the spiral drainage channel, and the second sedimentation inlet pipe. Step S2: Start the first booster pump and open the first electromagnetic water supply valve. The purified water in the water storage tank enters the tubular reverse osmosis membrane of the reverse osmosis membrane tank through the first water supply tee. Part of the water passes through the tubular reverse osmosis membrane to form recycled water, which is discharged from the recycled water pipe. The remaining retained water enters the sedimentation tank according to the retained water path in step S1. Step S3: Open the electromagnetic sludge valve to discharge the sludge at the bottom of the sedimentation tank; start the second booster pump and open the electromagnetic return valve. The supernatant in the sedimentation tank returns to the four-way water inlet pipe through the second booster pump and the sedimentation return pipe, and is mixed with the new water to be treated. Then, steps S1-S2 are repeated until the water level in the sedimentation tank is lower than the set value, and the second booster pump and the electromagnetic return valve are closed. Step S4: Under normal operating conditions of the water to be treated, the flow rate attenuation rates of the four-way water inlet pipe, the three-way water inlet pipe, the first water supply tee, and the second water supply tee are collected in real time by flow sensors. Combined with the instantaneous pressure difference fluctuation value of the pressure sensor, a dynamic fouling coefficient is constructed; when the fouling coefficient is greater than 0.75, emergency cleaning is triggered, and the flow rate attenuation rate calculation weight is increased in real time according to the turbidity of the inlet water; When cleaning the ultrafiltration membrane, the first electromagnetic water inlet valve is closed and the second electromagnetic water inlet valve is opened. The Grey Wolf algorithm is used to control the water inlet booster pump to generate a stepped pulse water flow, dynamically matching the upward speed of the cleaning float with the adhesion strength of the intercepted matter. The first and second electromagnetic water inlet valves are automatically opened or closed to switch the water flow direction back and forth to remove deep-seated pollutants. When cleaning the reverse osmosis membrane, the first electromagnetic water supply valve is closed and the second electromagnetic water supply valve is opened. The Grey Wolf algorithm is used to control the first booster pump to generate a stepped pulse water flow, driving the cleaning float upward in the tubular reverse osmosis membrane. The first and second electromagnetic water supply valves are automatically opened or closed to switch the water flow direction back and forth, removing deep-seated pollutants. The flow-pressure correlation curve and the peak value of the float movement resistance are recorded for each cleaning, and the water pressure increase and cleaning cycle are dynamically optimized through the Gray Wolf algorithm. When the float movement resistance suddenly changes, the low-power mode is immediately switched and the sound and light alarm is triggered. The cycle is terminated when the cleaning efficiency decays to 35% of the initial value.

[0017] The above solution of the present invention includes at least the following beneficial effects: The present invention efficiently treats wastewater; when the water to be treated is in normal working condition, the cleaning float is driven by water pressure to move up and down in the tubular ultrafiltration membrane and the tubular reverse osmosis membrane: on the one hand, the first cleaning scraper ring, the second cleaning scraper ring and the spiral scraper ring are used to scrape off the retained matter attached to the inner channel wall of the tubular ultrafiltration membrane and the tubular reverse osmosis membrane; on the other hand, the retained matter attached to each scraper ring is flushed and cleaned by means of water flow pressure, and the retained matter is discharged through the spiral drainage channel, thereby realizing self-cleaning of the cleaning float.

[0018] The dual-membrane self-cleaning control method of the present invention monitors the operating status of the membrane component in real time through multi-sensor fusion, realizing accurate prediction and dynamic response of fouling; the pulse water flow control technology based on the Grey Wolf algorithm can intelligently adjust the hydraulic parameters according to the characteristics of the pollutants, so that the motion trajectory of the cleaning float is accurately matched with the pollutant stripping requirements, significantly improving the cleaning efficiency of the membrane surface; the dual-stage water flow switching mechanism is combined with the asymmetric eddy current field design to effectively remove deep pollutants that are difficult to handle by traditional methods, thereby extending the service life of the membrane component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall three-dimensional structure of a double-membrane water recycling device provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a bracket for a double-membrane water recycling device provided in an embodiment of the present invention; Figure 3 A double membrane water recycling device provided in an embodiment of the present invention Figure 2 A magnified view of point A; Figure 4 A schematic structural diagram of an ultrafiltration membrane tank of a double-membrane water reuse device provided in an embodiment of the present invention; Figure 5 A double membrane water recycling device provided in an embodiment of the present invention Figure 4 Enlarged view of point B; Figure 6A double membrane water recycling device provided in an embodiment of the present invention Figure 4 Enlarged view of point C; Figure 7 A double membrane water recycling device provided in an embodiment of the present invention Figure 4 Enlarged view of point D; Figure 8 A schematic structural diagram of a reverse osmosis membrane tank of a double-membrane water reuse device provided in an embodiment of the present invention; Figure 9 A double membrane water recycling device provided in an embodiment of the present invention Figure 8 Enlarged view of point E; Figure 10 A schematic structural diagram of a tubular ultrafiltration membrane in a double-membrane water reuse device according to an embodiment of the present invention; Figure 11 A double membrane water recycling device provided in an embodiment of the present invention Figure 10 Enlarged view of point F; Figure 12 A double membrane water recycling device provided in an embodiment of the present invention Figure 10 Enlarged view of point G; Figure 13 A cross-sectional view of a cleaning float of a double-membrane water recycling device provided in an embodiment of the present invention.

[0020] Description of reference numerals: In the figure: 1, bracket; 101, docking plate; 2, ultrafiltration membrane tank; 3, reverse osmosis membrane tank; 4, sedimentation tank; 5, water storage tank; 6, tubular ultrafiltration membrane; 7, tubular reverse osmosis membrane; 8, cleaning parts; 801, cleaning float; 802, first cleaning scraper; 803, second cleaning scraper; 804, spiral scraper; 805, spiral drainage channel; 806, piston hole; 807, first dredging hole; 808, second dredging hole; 8 09, limit ring; 8010, first cleaning piston; 8011, second cleaning piston; 8012, spring seat plate; 8013, cleaning spring; 9, conveying parts; 901, water inlet pipe; 902, four-way water inlet pipe; 903, first electromagnetic water inlet valve; 904, three-way water inlet pipe; 905, second electromagnetic water inlet valve; 906, first external end cover; 907, first sedimentation inlet pipe; 908, first sewage pipe; 909, First solenoid valve; 9010, second sedimentation inlet pipe; 9011, second sewage pipe; 9012, second solenoid valve; 9013, sedimentation main pipe; 9014, water supply pipe; 9015, first booster pump; 9016, first solenoid water supply valve; 9017, first water supply tee; 9018, second solenoid water supply valve; 9019, second water supply tee; 9020, sedimentation return pipe; 9021, second booster pump; 90 22. Solenoid return valve; 9023. Sludge drain pipe; 9024. Solenoid sludge valve; 9025. Return water pipe; 9026. Second external end cover; 9027. Water inlet booster pump; 9028. Flow sensor; 9029. Pressure sensor; 9030. Water transfer pipe; 10. Butt joint pipe; 1001. First water ring channel; 1002. First dredge pipe; 1003. Second water ring channel; 1004. Second dredge pipe. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0022] like Figures 1 to 13As shown, an embodiment of the present invention provides a double-membrane water reuse device, including: a bracket 1 and an ultrafiltration membrane tank 2 arranged in the bracket 1, a reverse osmosis membrane tank 3 is fixed inside the bracket 1, a sedimentation tank 4 is fixed inside the bracket 1, and a water storage tank 5 is fixed inside the bracket 1, and also includes: a tubular ultrafiltration membrane 6, fixed in the ultrafiltration membrane tank 2; a tubular reverse osmosis membrane 7, fixed in the reverse osmosis membrane tank 3; a cleaning part 8, slidably arranged in the ultrafiltration membrane tank 2 and the reverse osmosis membrane tank 3, for cleaning the retained attachments on the inner walls of the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7; a conveying part 9, respectively fixed on the ultrafiltration membrane tank 2, the reverse osmosis membrane tank 3, the sedimentation tank 4 and the water storage tank 5, for regulating the flow direction of water to drive the cleaning part 8 to reciprocate along a predetermined trajectory.

[0023] The butt joint 10 is fixed on both ends of the ultrafiltration membrane tank 2 and the reverse osmosis membrane tank 3; the cleaning float 801 is vertically slidably arranged in the butt joint 10, and is vertically slidably arranged in the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7, and the upper and lower end surfaces are inclined surfaces; the first cleaning scraper 802 is fixed above the cleaning float 801; the second cleaning scraper 803 is fixed below the cleaning float 801, and the lower end surface is inclined surface; the spiral scraper 804 is fixed on the cleaning float 8 01, one end is fixed on the first cleaning scraper 802, and the other end is fixed on the second cleaning scraper 803; the upper and lower end faces of the cleaning float 801 are both inclined, the upper end face of the first cleaning scraper 802 is inclined, and is adapted to the upper end inclined face of the cleaning float 801, and the lower end face of the second cleaning scraper 803 is inclined, and is adapted to the lower end inclined face of the cleaning float 801; the inner wall of the butt-jointed pipe 10 and the spiral scraper 804 together form a spiral drainage channel 805.

[0024] The bracket 1 is fixed with a docking plate 101; two ultrafiltration membrane tanks 2 are provided, and the two ultrafiltration membrane tanks 2 are located on the same side of the sedimentation tank 4 and the water storage tank 5; two reverse osmosis membrane tanks 3 are provided, and the two reverse osmosis membrane tanks 3 are located on the same side of the sedimentation tank 4 and the water storage tank 5, and the reverse osmosis membrane tank 3 is opposite to the ultrafiltration membrane tank 2; a first water ring channel 1001 is opened inside the docking tube 10, and the first water ring channel 1001 is connected to the first dredge hole 807, and a first dredge pipe 1002 is fixed on the outside of the docking tube 10, a second water ring channel 1003 is opened inside the docking tube 10, and the second water ring channel 1003 is connected to the second dredge hole 808, and a second dredge pipe 1004 is fixed on the outside of the docking tube 10.

[0025] Specifically, the reverse osmosis membrane in this device is a tubular reverse osmosis membrane 7, which is conducive to cleaning the retained matter. The first booster pump 9015 can increase the internal water pressure of the tubular reverse osmosis membrane 7, which facilitates the effective filtration of the tubular reverse osmosis membrane 7.

[0026] The sedimentation tank 4 is used to precipitate the intercepted water. By adding a stirring system and adding chemical flocculants, the impurities in the sedimentation tank 4 can be promoted to condense and form sediment. The sedimentation tank 4 is equipped with an ultrasonic sensor to monitor the thickness of the sediment layer and control its discharge.

[0027] As a preferred embodiment of the present invention, the cleaning member 8 also includes: a piston hole 806, which is opened on the cleaning float 801; a first dredging hole 807, which is opened in the cleaning float 801 and is located above the cleaning float 801; and a second dredging hole 808, which is opened in the cleaning float 801 and is located below the cleaning float 801.

[0028] The cleaning member 8 also includes: a limiting ring 809, fixed on the piston hole 806; a first cleaning piston 8010, slidably set in the piston hole 806; a second cleaning piston 8011, slidably set in the piston hole 806, and located directly below the first cleaning piston 8010; a spring seat plate 8012, fixed in the piston hole 806; a cleaning spring 8013, one end of which is fixed on the first cleaning piston 8010 and the second cleaning piston 8011, and the other end is fixed on the spring seat plate 8012.

[0029] Specifically, the limiting ring 809 is used to limit the displacement positions of the first cleaning piston 8010 and the second cleaning piston 8011 .

[0030] As a preferred embodiment of the present invention, the conveying member 9 includes: a water inlet main pipe 901, located above the bracket 1; a four-way water inlet pipe 902, fixed above the water inlet main pipe 901 and fixed on the butt joint pipe 10 above the two ultrafiltration membrane tanks 2; a first electromagnetic water inlet valve 903, fixed above the water inlet main pipe 901; a three-way water inlet pipe 904, the water inlet end of which is fixed below the water inlet main pipe 901, and the water outlet ends of which are respectively fixed on the butt joint pipes 10 below the two ultrafiltration membrane tanks 2; a second electromagnetic water inlet valve 905, fixed below the water inlet main pipe 901; and a first external end cover 906, threadedly sleeved on the water inlet main pipe 901.

[0031] The conveying member 9 also includes: a first sedimentation inlet pipe 907, both ends of which are fixed on the butt joint pipe 10 above the two ultrafiltration membrane tanks 2, and both ends are fixed on the butt joint pipe 10 above the two reverse osmosis membrane tanks 3, and are connected to the first dredge pipe 1002; a first sewage pipe 908, fixed on both ends of the first sedimentation inlet pipe 907; a first solenoid valve 909, fixed on both ends of the first sedimentation inlet pipe 907, fixed on the first sewage pipe 908; a second sedimentation inlet pipe 9010, both ends of which are fixed on the two ultrafiltration membrane tanks 2. On the docking pipe 10 below the membrane tank 2, both ends are fixed on the docking pipe 10 below the two reverse osmosis membrane tanks 3, and are connected to the second dredging pipe 1004; the second sewage pipe 9011 is fixed on both ends of the second sewage pipe 9011; the second solenoid valve 9012 is fixed on both ends of the second sedimentation inlet pipe 9010 and fixed on the second sewage pipe 9011; the sedimentation main pipe 9013, one end is fixed on the first sedimentation inlet pipe 907 and the second sedimentation inlet pipe 9010, and the other end is fixed on the sedimentation tank 4.

[0032] The conveying member 9 also includes: a water supply pipe 9014, fixed below the water storage tank 5; a first booster pump 9015, the pump seat of which is fixed below the water storage tank 5, and the working end is fixed on the water supply pipe 9014; a first electromagnetic water supply valve 9016, fixed above the water supply pipe 9014; a first water supply tee 9017, the water inlet end of which is fixed above the water supply pipe 9014, and the water outlet ends are respectively fixed on the butt joints 10 above the two reverse osmosis membrane tanks 3; a second electromagnetic water supply valve 9018, fixed below the water supply pipe 9014; a second water supply tee 9019, the water inlet end of which is fixed below the water supply pipe 9014, and the water outlet ends are respectively fixed on the butt joints 10 below the two reverse osmosis membrane tanks 3.

[0033] The conveying member 9 also includes: a sedimentation return pipe 9020, one end of which is plugged into the sedimentation tank 4 and the other end is fixed to the four-way water inlet pipe 902; a second booster pump 9021, the pump seat of which is fixed above the sedimentation tank 4 and the working end is fixed to the sedimentation return pipe 9020; an electromagnetic return valve 9022, which is fixed to the sedimentation return pipe 9020; a sludge discharge pipe 9023, which is fixed below the sedimentation tank 4; an electromagnetic sludge valve 9024, which is fixed to the sludge discharge pipe 9023; a return water pipe 9025, which is fixed to the reverse osmosis membrane tank 3; a second external end cap 9026, which is threaded Connected to the return water pipe 9025; the water inlet booster pump 9027, the pump seat is fixed on the bracket 1; the flow sensor 9028 is fixed on the four-way water inlet pipe 902 and the three-way water inlet pipe 904, fixed on the first water supply tee 9017 and the second water supply tee 9019; the pressure sensor 9029 is fixed on the four-way water inlet pipe 902 and the three-way water inlet pipe 904, fixed on the first water supply tee 9017 and the second water supply tee 9019; the water transfer pipe 9030, one end of which is fixed in the middle of the ultrafiltration membrane tank 2, and the other end is fixed above the water storage tank 5.

[0034] Working principle: the bracket 1, two ultrafiltration membrane tanks 2, two reverse osmosis membrane tanks 3, the sedimentation tank 4, and the water storage tank 5 form a water reuse unit. Multiple water reuse units can be set according to water demand. The first external end cover 906 and the second external end cover 9026 are removed from the water inlet main 901 and the return water pipe 9025, and then the added water reuse unit is connected to the docking plate 101 of the two brackets 1 by bolts, so that multiple brackets 1 are effectively fixed together; the water inlet main 901 is connected to the pipeline for water reuse to be purified, and the return water pipe 9025 is connected to the pipeline for water reuse after purification; this device is composed of three water reuse units.

[0035] During normal operation, the water inlet booster pump 9027 is started to pump the external water to be purified into the water inlet main pipe 901, and the purified water in the water inlet main pipe 901 is supplied to the three water reuse units; the first electromagnetic water inlet valve 903 is opened, the second electromagnetic water inlet valve 905 is in a closed state, the water inlet main pipe 901 supplies water to the four-way water inlet pipe 902, the electromagnetic return valve 9022 is in a closed state, and the water to be treated enters from the docking pipe 10 on the top of the ultrafiltration membrane tank 2. The water to be treated then enters the tubular ultrafiltration membrane 6 of the ultrafiltration membrane tank 2 from the docking pipe 10; after the water to be treated enters the tubular ultrafiltration membrane 6 of the ultrafiltration membrane tank 2, water pressure is generated. Under the action of the water pressure, part of the water to be treated passes through the tubular ultrafiltration membrane 6 to complete the first purification and form purified water; the purified water remains between the inner wall of the ultrafiltration membrane tank 2 and the outer wall of the tubular ultrafiltration membrane 6, and under the action of the water pressure, flows into the water storage tank 5 through the water transfer pipe 9030; the remaining water to be treated is intercepted by the tubular ultrafiltration membrane 6 The retained water forms trapped water in the tube, and the trapped water flows downward along the internal channel of the tubular ultrafiltration membrane 6; during the flow process, the cleaning float 801 is pushed to move downward along the internal channel of the tubular ultrafiltration membrane 6 synchronously until it enters the docking pipe 10 below the ultrafiltration membrane tank 2; the water pressure exerted by the trapped water on the cleaning float 801 will push the first cleaning piston 8010 to retract into the piston hole 806, and the retracted first cleaning piston 8010 compresses the cleaning spring 8013, so that the first dredge hole 807 is released from the closed state; the trapped water enters from the piston hole 806 above the cleaning float 801, flows into the spiral drainage channel 805 through the first dredge hole 807, and then enters the sedimentation tank 4 from the spiral drainage channel 805 through the second water ring channel 1003, the second dredge pipe 1004, the second sedimentation inlet pipe 9010, and the sedimentation main pipe 9013 for sedimentation; the second solenoid valve 9012 of the second sedimentation inlet pipe 9010 is in the open state.

[0036] The first booster pump 9015 is started, and the first booster pump 9015 draws purified water from the water storage tank 5 through the water supply pipe 9014 and delivers it to the first water supply tee 9017. The first electromagnetic water supply valve 9016 is in the open state. The purified water passes through the first water supply tee 9017 and the docking pipe 10 above the reverse osmosis membrane tank 3 into the tubular reverse osmosis membrane 7 in the tank. Under the action of pressure, part of the purified water passes through the tubular reverse osmosis membrane 7, forming recycled water between the inner wall of the reverse osmosis membrane tank 3 and the outer wall of the tubular reverse osmosis membrane 7. The recycled water is discharged from the system through the recycled water pipe 9025. The remaining retained water is treated in the same manner as the retained water of the tubular ultrafiltration membrane 6, passing through the second dredge pipe 1004, the second sedimentation inlet pipe 9010 and the sedimentation main pipe 9013 in sequence, and finally enters the sedimentation tank 4 for sedimentation treatment. The second electromagnetic valve 9012 on the second sedimentation inlet pipe 9010 exiting the reverse osmosis membrane tank 3 remains in the open state.

[0037] Before the retained water in the sedimentation tank 4 is subjected to secondary circulation filtration, the electromagnetic sludge valve 9024 is first opened to discharge the sediment at the bottom of the sedimentation tank 4 through the sludge drain pipe 9023, and the remaining retained water without sediment enters the circulation stage; the second booster pump 9021 is started, and the electromagnetic return valve 9022 is opened. The second booster pump 9021 extracts the retained water through the sedimentation return pipe 9020 and transports it to the four-way water inlet pipe 902; the water inlet booster pump 9027 appropriately reduces the water inlet amount of new water to be treated, and the water inlet booster pump 9027 and the second booster pump 9021 cooperate to maintain the water pressure in the ultrafiltration membrane tank 2 and the tubular ultrafiltration membrane 6 stable; after the retained water is mixed with the water to be treated, the above water reuse process is repeated until the water level in the sedimentation tank 4 drops below the set value, and the second booster pump 9021 and the electromagnetic return valve 9022 are automatically closed.

[0038] When cleaning the double membrane retention, due to the long-term operation of this device, the internal channel walls of the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7 will be attached with retention, resulting in a decrease in filtration efficiency. The retention attached to the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7 needs to be cleaned. The method of cleaning the retention on the internal channel walls of the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7 is the same.

[0039] Close the first electromagnetic water inlet valve 903 on the water inlet main 901, and open the second electromagnetic water inlet valve 905; the water to be treated enters the tubular ultrafiltration membrane 6 from the butt joint 10 below the ultrafiltration membrane tank 2 through the three-way water inlet pipe 904, and the water flow pressure pushes the cleaning float 801 upward. The water to be treated above the cleaning float 801 is converted into purified water through the membrane under the action of pressure; during the rising process of the cleaning float 801, the first cleaning scraper 802 and the spiral scraper 804 on the cleaning float 801 successively scrape the cut-off water attached to the inner wall of the tubular ultrafiltration membrane 6 The retained matter is scraped off until the cleaning float 801 reaches the docking pipe 10 at the top of the ultrafiltration membrane tank 2; then the valve state is switched, the first electromagnetic water inlet valve 903 is opened, and the second electromagnetic water inlet valve 905 is closed, and the cleaning float 801 descends under the action of the reverse water flow. During the downward process, the second cleaning scraper ring 803 and the spiral scraper ring 804 scrape the inner wall again; by periodically switching the switch state of the two valves, the cleaning float 801 is driven by water pressure to reciprocate, thereby realizing continuous cleaning of the retained matter on the inner wall of the tubular ultrafiltration membrane 6.

[0040] When the cleaning float 801 completes its last upward movement and stays in the docking pipe 10 above the ultrafiltration membrane tank 2, the retained water of the tubular ultrafiltration membrane 6 pushes the second cleaning piston 8011 to retract into the piston hole 806, and the retained water flows through the piston hole 806 into the second dredging hole 808 and the spiral drainage channel 805, and brings the retained matter scraped off by the second cleaning scraper 803 into the spiral drainage channel 805; the water flow carrying the retained matter passes through the first water ring channel 1001, the first dredging pipe 1002 and the first sedimentation inlet pipe 907 in turn, at this time, the first solenoid valve 909 on the first sedimentation inlet pipe 907 is closed, and the first solenoid valve 909 on the first sewage pipe 908 is opened, so that the retained matter is discharged through the first sewage pipe 908; after the discharge is completed, the first solenoid valve 909 is closed to complete the cleaning process.

[0041] When the cleaning float 801 moves down for the last time, it needs to stay in the docking tube 10 below the ultrafiltration membrane tank 2 for a certain period of time; the retained water of the tubular ultrafiltration membrane 6 pushes the first cleaning piston 8010 to retract into the piston hole 806, and the retained water flows through the piston hole 806, the second dredging hole 808, the spiral drainage channel 805, the second water ring channel 1003 and the second dredging pipe 1004 in turn, and is finally transported to the second sedimentation inlet pipe 9010; close the second solenoid valve 9012 on the second sedimentation inlet pipe 9010, open the second solenoid valve 9012 on the second sewage pipe 9011, and discharge the sediment from the second sewage pipe 9011.

[0042] When cleaning the retained matter attached to the tubular reverse osmosis membrane 7, the water pressure flow direction is controlled by switching the first electromagnetic water inlet valve 903 and the second electromagnetic water inlet valve 905 back and forth. The cleaning method of the tubular reverse osmosis membrane 7 is the same as that of the tubular ultrafiltration membrane 6.

[0043] During the entire process, the water to be treated is in normal working condition, and the water pressure drives the cleaning float 801 to move up and down inside the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7: on the one hand, the first cleaning scraper 802, the second cleaning scraper 803 and the spiral scraper 804 scrape off the retained matter attached to the internal channel wall of the tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7; on the other hand, the retained matter attached to each scraper is flushed and cleaned with the help of water flow pressure, and these retained matter is discharged through the spiral drainage channel 805, thereby realizing the self-cleaning of the cleaning float 801.

[0044] The tubular ultrafiltration membrane 6 and the tubular reverse osmosis membrane 7 can be taken out by removing the connecting bolts between the ultrafiltration membrane tank 2, the reverse osmosis membrane tank 3 and the butt joint 10, and then cleaned or replaced with chemicals.

[0045] A recycling method for a double-membrane water recycling device, the recycling method steps are as follows: Step S1: Start the water inlet booster pump 9027, open the first electromagnetic water inlet valve 903, and close the second electromagnetic water inlet valve 905. The water to be purified enters the tubular ultrafiltration membrane 6 of the ultrafiltration membrane tank 2 through the water inlet main 901 and the four-way water inlet pipe 902. Under the action of water pressure, part of the water passes through the tubular ultrafiltration membrane 6 to form purified water, and then flows into the water storage tank 5 through the water transfer pipe 9030. The remaining retained water pushes the first cleaning piston 8010 of the cleaning float 801 downward and enters the sedimentation tank 4 through the first dredging hole 807, the spiral drainage channel 805, and the second sedimentation inlet pipe 9010. Step S2: Start the first booster pump 9015 and open the first electromagnetic water supply valve 9016. The purified water in the water storage tank 5 enters the tubular reverse osmosis membrane 7 of the reverse osmosis membrane tank 3 through the first water supply tee 9017. Part of the water passes through the tubular reverse osmosis membrane 7 to form recycled water, which is discharged from the recycled water pipe 9025. The remaining retained water enters the sedimentation tank 4 according to the retained water path in step S1. Step S3: Open the electromagnetic sludge valve 9024 to discharge the sludge at the bottom of the sedimentation tank 4; start the second booster pump 9021, open the electromagnetic return valve 9022, and the supernatant in the sedimentation tank 4 returns to the four-way water inlet pipe 902 through the second booster pump 9021 and the sedimentation return pipe 9020, and is mixed with the new water to be treated, and then repeat steps S1-S2 until the water level in the sedimentation tank 4 is lower than the set value, and then close the second booster pump 9021 and the electromagnetic return valve 9022; Step S4: Under normal operating conditions of the water to be treated, the flow rate attenuation rate of the four-way water inlet pipe 902, the three-way water inlet pipe 904, the first water supply tee 9017, and the second water supply tee 9019 is collected in real time by flow sensor 9028. Combined with the instantaneous pressure difference fluctuation value of pressure sensor 9029, a dynamic fouling coefficient is constructed. When the fouling coefficient is greater than 0.75, emergency cleaning is triggered, and the flow rate attenuation rate calculation weight is increased in real time according to the turbidity of the inlet water. When cleaning the ultrafiltration membrane, the first electromagnetic water inlet valve 903 is closed and the second electromagnetic water inlet valve 905 is opened. The Gray Wolf algorithm is used to control the water inlet booster pump 9027 to generate a stepped pulse water flow, dynamically matching the upward speed of the cleaning float 801 with the adhesion strength of the retained matter. The first electromagnetic water inlet valve 903 and the second electromagnetic water inlet valve 905 are automatically opened or closed to switch the water flow direction back and forth to remove deep-seated contaminants. When cleaning the reverse osmosis membrane, the first electromagnetic water supply valve 9016 is closed and the second electromagnetic water supply valve 9018 is opened. The Grey Wolf algorithm is used to control the first booster pump 9015 to generate a stepped pulse water flow, driving the cleaning float 801 upward in the tubular reverse osmosis membrane 7. The first electromagnetic water supply valve 9016 and the second electromagnetic water supply valve 9018 are automatically opened or closed to switch the water flow direction back and forth to remove deep-seated contaminants. The flow-pressure correlation curve and the peak value of the float movement resistance are recorded for each cleaning, and the water pressure increase and cleaning cycle are dynamically optimized through the Gray Wolf algorithm. When the float movement resistance suddenly changes, the low-power mode is immediately switched and the sound and light alarm is triggered. The cycle is terminated when the cleaning efficiency decays to 35% of the initial value.

[0046] In step S4, under normal working conditions of the water to be treated, flow data is collected in real time by flow sensors 9028 distributed in the four-way water inlet pipe 902, the three-way water inlet pipe 904, the first water supply tee 9017 and the second water supply tee 9019, and a dynamic fouling coefficient mathematical model is constructed in combination with the instantaneous pressure difference fluctuation value obtained by the pressure sensor 9029; the dynamic fouling coefficient mathematical model is based on the multi-source data fusion technology of the Grey Wolf optimization algorithm, and the flow attenuation rate and the pressure difference fluctuation value are nonlinearly weighted, and the emergency cleaning procedure is triggered when the fouling coefficient exceeds the threshold of 0.75; the system is synchronously connected to the water inlet turbidity sensor, and the calculation weight of the flow attenuation rate is dynamically adjusted according to the real-time turbidity value, which can increase the calculation weight by up to 40%, thereby realizing intelligent prediction in the pretreatment stage.

[0047] The ultrafiltration membrane cleaning process adopts two-stage hydrodynamic coordinated control: first, in the expulsion stage, the first electromagnetic water inlet valve 903 is closed, and the second electromagnetic water inlet valve 905 is opened. The water inlet booster pump 9027 is controlled by the Gray Wolf algorithm to generate a step pulse water flow with a frequency range of 0.5 to 3 Hz; the frequency, amplitude and duration of the step pulse water flow are dynamically adjusted according to the real-time calculated adhesion strength of the intercepted matter to ensure that the upward speed of the cleaning float 801 is optimally matched with the pollutant stripping rate; when entering the encirclement stage, the system automatically opens or closes the first electromagnetic water inlet valve 903 and the second electromagnetic water inlet valve 905 to switch the water flow direction back and forth to strip deep pollutants.

[0048] The reverse osmosis membrane cleaning adopts a two-stage control strategy similar to that of the ultrafiltration membrane. The first electromagnetic water supply valve 9016 is closed, the second electromagnetic water supply valve 9018 is opened, and the first booster pump 9015 is controlled by the Grey Wolf algorithm to generate a stepped pulse water flow to drive the cleaning float 801 upward in the tubular reverse osmosis membrane 7; in the reverse water flow stage, based on the historical cleaning database, the system dynamically adjusts the pressure parameters of the first booster pump 9015 through the Grey Wolf algorithm, automatically opens or closes the first electromagnetic water supply valve 9016 and the second electromagnetic water supply valve 9018, so that the water flow direction is switched back and forth to remove deep-seated pollutants.

[0049] The system's built-in dynamic parameter self-learning mechanism continuously records the flow-pressure correlation curve and peak data of the movement resistance of the cleaning float 801 during each cleaning process by establishing a hunting memory library; utilizing the global optimization capability of the Gray Wolf algorithm, the system can automatically optimize the water pressure increase range, ranging from 10% to 25% of the baseline value, and intelligently adjust the cleaning cycle according to the change rate of the fouling coefficient, with a minimum of 4 hours and a maximum of 15 hours; when the movement resistance of the cleaning float 801 suddenly changes and exceeds the preset threshold, the system immediately triggers a three-level risk avoidance response: first switch to low-power operation mode, synchronously start the sound and light alarm system, and send an abnormal alarm to the operation and maintenance personnel through the GPRS module; the cleaning efficiency evaluation adopts the second-order derivative analysis technology of the sewage flow curve. When it is monitored that the cleaning efficiency has decayed to 35% of the initial value, the current cleaning cycle is automatically terminated to avoid ineffective energy consumption.

[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A double-membrane water recycling device, comprising: A bracket and an ultrafiltration membrane tank arranged in the bracket, a reverse osmosis membrane tank is fixed inside the bracket, a sedimentation tank is fixed inside the bracket, and a water storage tank is fixed inside the bracket, characterized in that it also includes: The tubular ultrafiltration membrane is fixed in the ultrafiltration membrane tank; the tubular reverse osmosis membrane is fixed in the reverse osmosis membrane tank; the cleaning member is slidably arranged in the ultrafiltration membrane tank and the reverse osmosis membrane tank, and is used to clean the retained attachments on the inner walls of the tubular ultrafiltration membrane and the tubular reverse osmosis membrane; the conveying member is respectively fixed to the ultrafiltration membrane tank, the reverse osmosis membrane tank, the sedimentation tank and the water storage tank, and is used to control the flow direction of the water to drive the cleaning member to reciprocate along a predetermined trajectory; Butt joints are fixed on both ends of the ultrafiltration membrane tank and the reverse osmosis membrane tank; The cleaning float is vertically slidably arranged in the butt joint tube, and is vertically slidably arranged in the tubular ultrafiltration membrane and the tubular reverse osmosis membrane, and the upper and lower end surfaces are inclined surfaces; the first cleaning scraper ring is fixed above the cleaning float; the second cleaning scraper ring is fixed below the cleaning float, and the lower end surface is inclined surface; the spiral scraper ring is fixed on the cleaning float, with one end fixed on the first cleaning scraper ring and the other end fixed on the second cleaning scraper ring; The upper and lower end surfaces of the cleaning float are both inclined, the upper end surface of the first cleaning scraper ring is inclined and matched with the upper end inclined surface of the cleaning float, and the lower end surface of the second cleaning scraper ring is inclined and matched with the lower end inclined surface of the cleaning float; The inner wall of the butt-joint pipe and the spiral scraper ring together form a spiral drainage channel.

2. A double membrane water recycling device according to claim 1, characterized in that: The cleaning member also includes: The piston hole is opened on the cleaning float; the first dredge hole is opened in the cleaning float and is located above the cleaning float; the second dredge hole is opened in the cleaning float and is located below the cleaning float.

3. A double membrane water recycling device according to claim 2, characterized in that: The cleaning member also includes: A limiting ring is fixed on the piston hole; a first cleaning piston is slidably set in the piston hole; a second cleaning piston is slidably set in the piston hole and is located directly below the first cleaning piston; a spring seat plate is fixed in the piston hole; a cleaning spring has one end fixed on the first cleaning piston and the second cleaning piston, and the other end fixed on the spring seat plate.

4. A double membrane water recycling device according to claim 1, characterized in that: The bracket is fixed with a docking plate; two ultrafiltration membrane tanks are provided, and the two ultrafiltration membrane tanks are located on the same side of the sedimentation tank and the water storage tank; two reverse osmosis membrane tanks are provided, and the two reverse osmosis membrane tanks are located on the same side of the sedimentation tank and the water storage tank, and the reverse osmosis membrane tank is opposite to the ultrafiltration membrane tank.

5. A double membrane water recycling device according to claim 1, characterized in that: A first water ring channel is opened inside the connecting tube, and the first water ring channel is connected to the first dredge hole. A first dredge pipe is fixed on the outside of the connecting tube. A second water ring channel is opened inside the connecting tube, and the second water ring channel is connected to the second dredge hole. A second dredge pipe is fixed on the outside of the connecting tube.

6. A double membrane water recycling device according to claim 1, characterized in that: The conveying member comprises: The water inlet main is located above the bracket; the four-way water inlet pipe is fixed above the water inlet main and fixed on the butt joint pipes above the two ultrafiltration membrane tanks; the first electromagnetic water inlet valve is fixed above the water inlet main; the three-way water inlet pipe has its water inlet end fixed below the water inlet main and its water outlet ends respectively fixed on the butt joint pipes below the two ultrafiltration membrane tanks; the second electromagnetic water inlet valve is fixed below the water inlet main; the first external end cover is threadedly sleeved on the water inlet main.

7. A double membrane water recycling device according to claim 6, characterized in that: The conveying member further comprises: The first sedimentation inlet pipe, both ends of which are fixed on the butt joints above the two ultrafiltration membrane tanks, both ends of which are fixed on the butt joints above the two reverse osmosis membrane tanks, and are connected to the first dredge pipe; the first sewage pipe, which is fixed on both ends of the first sedimentation inlet pipe; the first solenoid valve, which is fixed on both ends of the first sedimentation inlet pipe, and is fixed on the first sewage pipe; the second sedimentation inlet pipe, both ends of which are fixed on the butt joints below the two ultrafiltration membrane tanks, both ends of which are fixed on the butt joints below the two reverse osmosis membrane tanks, and are connected to the second dredge pipe; the second sewage pipe, which is fixed on both ends of the second sewage pipe; the second solenoid valve, which is fixed on both ends of the second sedimentation inlet pipe, and is fixed on the second sewage pipe; the sedimentation main pipe, one end of which is fixed on the first sedimentation inlet pipe and the second sedimentation inlet pipe, and the other end is fixed on the sedimentation tank.

8. A double membrane water recycling device according to claim 7, characterized in that: The conveying member further comprises: The water supply pipe is fixed under the water tank; the first booster pump has a pump base fixed under the water tank and a working end fixed on the water supply pipe; the first electromagnetic water supply valve is fixed above the water supply pipe; the first water supply tee has a water inlet end fixed above the water supply pipe, and both water outlet ends are respectively fixed on the butt joints above the two reverse osmosis membrane tanks; the second electromagnetic water supply valve is fixed under the water supply pipe; the second water supply tee has a water inlet end fixed under the water supply pipe, and both water outlet ends are respectively fixed on the butt joints below the two reverse osmosis membrane tanks.

9. A double membrane water recycling device according to claim 8, characterized in that: The conveying member further comprises: One end of the sedimentation return pipe is inserted into the sedimentation tank, and the other end is fixed on the four-way water inlet pipe; the second booster pump, the pump seat is fixed above the sedimentation tank, and the working end is fixed on the sedimentation return pipe; the electromagnetic return valve is fixed on the sedimentation return pipe; the sludge discharge pipe is fixed below the sedimentation tank; the electromagnetic sludge valve is fixed on the sludge discharge pipe; the return water pipe is fixed on the reverse osmosis membrane tank; the second external end cover is threaded onto the return water pipe; the water inlet booster pump, the pump seat is fixed on the bracket; the flow sensor is fixed on the four-way water inlet pipe and the three-way water inlet pipe, and fixed on the first water supply tee and the second water supply tee; the pressure sensor is fixed on the four-way water inlet pipe and the three-way water inlet pipe, and fixed on the first water supply tee and the second water supply tee; the water transfer pipe, one end is fixed in the middle of the ultrafiltration membrane tank, and the other end is fixed above the water storage tank.

10. A method for recycling water from a double membrane process, applied to a double membrane process water recycling device according to any one of claims 1 to 9, characterized in that: The steps for recycling are as follows: Step S1: Start the water inlet booster pump, open the first electromagnetic water inlet valve, close the second electromagnetic water inlet valve, and allow the water to be purified to enter the tubular ultrafiltration membrane of the ultrafiltration membrane tank through the water inlet main pipe and the four-way water inlet pipe. Under the action of water pressure, part of the water passes through the tubular ultrafiltration membrane to form purified water, and then flows into the water storage tank through the water transfer pipe. The remaining retained water pushes the first cleaning piston of the cleaning float downward and enters the sedimentation tank through the first dredging hole, the spiral drainage channel, and the second sedimentation inlet pipe. Step S2: Start the first booster pump and open the first electromagnetic water supply valve. The purified water in the water storage tank enters the tubular reverse osmosis membrane of the reverse osmosis membrane tank through the first water supply tee. Part of the water passes through the tubular reverse osmosis membrane to form recycled water, which is discharged from the recycled water pipe. The remaining retained water enters the sedimentation tank according to the retained water path in step S1. Step S3: Open the electromagnetic sludge valve to discharge the sludge at the bottom of the sedimentation tank; start the second booster pump and open the electromagnetic return valve. The supernatant in the sedimentation tank returns to the four-way water inlet pipe through the second booster pump and the sedimentation return pipe, and is mixed with the new water to be treated. Then, steps S1-S2 are repeated until the water level in the sedimentation tank is lower than the set value, and the second booster pump and the electromagnetic return valve are closed. Step S4: Under normal operating conditions of the water to be treated, the flow rate attenuation rates of the four-way water inlet pipe, the three-way water inlet pipe, the first water supply tee pipe, and the second water supply tee pipe are collected in real time by flow sensors, and the dynamic fouling coefficient is constructed in combination with the instantaneous pressure difference fluctuation value of the pressure sensor; When the fouling coefficient is greater than 0.75, emergency cleaning is triggered, and the flow attenuation rate calculation weight is increased in real time according to the influent turbidity; When cleaning the ultrafiltration membrane, the first electromagnetic water inlet valve is closed and the second electromagnetic water inlet valve is opened. The Grey Wolf algorithm is used to control the water inlet booster pump to generate a stepped pulse water flow, dynamically matching the upward speed of the cleaning float with the adhesion strength of the intercepted matter. The first and second electromagnetic water inlet valves are automatically opened or closed to switch the water flow direction back and forth to remove deep-seated pollutants. When cleaning the reverse osmosis membrane, the first electromagnetic water supply valve is closed and the second electromagnetic water supply valve is opened. The Grey Wolf algorithm is used to control the first booster pump to generate a stepped pulse water flow, driving the cleaning float upward in the tubular reverse osmosis membrane. The first and second electromagnetic water supply valves are automatically opened or closed to switch the water flow direction back and forth, removing deep-seated pollutants. The flow-pressure correlation curve and the peak value of the float movement resistance are recorded for each cleaning, and the water pressure increase and cleaning cycle are dynamically optimized through the Gray Wolf algorithm. When the float movement resistance suddenly changes, the low-power mode is immediately switched and the sound and light alarm is triggered. The cycle is terminated when the cleaning efficiency decays to 35% of the initial value.

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