A wastewater purification and reuse device based on a membrane bioreactor

Abstract

This invention relates to the field of wastewater treatment technology, and in particular to a wastewater purification and reuse device based on a membrane bioreactor. Addressing the limited removal efficiency of pollutants adhering to membrane elements in existing technologies, this invention provides a wastewater purification and reuse device based on a membrane bioreactor. The device includes a treatment tank containing a membrane bioreactor assembly. The assembly includes an assembly frame with multiple membrane elements mounted on it. Scrapers that cooperate with the membrane elements are located on both sides of a horizontal plate. A cleaning assembly also includes a vertically movable frame. When the frame moves downwards, the horizontal plate moves downwards, and the scrapers clean the outer surface of the membrane elements downwards. A movable scraper is located on a support, and a collection box is located on one side of the support. When the scraper moves to one side, the collection box opens. By directly scraping away impurities adhering to the outer surface of the membrane elements, suspended solids, colloidal particles, microbial flocs, and other pollutants on the membrane surface can be removed quickly and effectively.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater purification and reuse device based on a membrane bioreactor. Background Technology

[0002] With the acceleration of urbanization and the continuous development of industrial production, sewage discharge has been increasing year by year, and water shortage and water pollution problems are becoming increasingly serious. Sewage treatment and its reuse have become important ways to alleviate water resource pressure. Membrane bioreactors (MBRs), as a highly efficient sewage treatment technology, are widely used in the treatment of domestic sewage and industrial wastewater due to their advantages such as small footprint, good treatment effect, and stable effluent quality. However, during the long-term operation of MBRs, impurities such as suspended solids, colloidal particles, and microbial flocs in the sewage easily adhere to the outer surface of the membrane element, forming membrane fouling. Membrane fouling leads to a decrease in membrane flux and an increase in transmembrane pressure, which not only reduces sewage treatment efficiency but also shortens the service life of the membrane element and increases equipment operation and maintenance costs.

[0003] Currently, existing technologies for membrane element fouling control mainly employ physical cleaning methods such as aeration scrubbing, backwashing, and chemical cleaning. Aeration scrubbing removes impurities from the membrane surface through the shear force generated by rising air bubbles, but its effectiveness against firmly adhered pollutants is limited. Backwashing consumes large amounts of clean water and can easily lead to further deposition of pollutants within the membrane pores. Chemical cleaning may damage the membrane element, and the chemicals used in cleaning can cause secondary pollution. Furthermore, most existing cleaning methods cannot achieve targeted scraping and centralized collection of impurities; the cleaned impurities are easily redispersed into the wastewater, causing further membrane fouling and severely impacting the stable operation of the membrane bioreactor and the wastewater purification effect, making it difficult to meet the needs of practical wastewater purification and reuse. Therefore, this paper proposes a wastewater purification and reuse device based on a membrane bioreactor to solve the above problems. Summary of the Invention

[0004] This invention addresses the problem of limited pollutant removal efficiency of membrane elements in existing technologies by providing a wastewater purification and reuse device based on a membrane bioreactor. By directly scraping away impurities adhering to the outer surface of the membrane element, it can quickly and effectively remove pollutants such as suspended solids, colloidal particles, and microbial flocs from the membrane surface. Compared with traditional methods such as aeration scrubbing and backwashing, scraping is more targeted and effective in removing pollutants, effectively solving the problems mentioned in the background art.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: A wastewater purification and reuse device based on a membrane bioreactor includes a treatment tank. Inside the treatment tank is a membrane bioreactor assembly, which includes an assembly frame with multiple membrane elements mounted on it. The treatment tank also includes a cleaning assembly, which comprises multiple horizontal plates. Each horizontal plate has scrapers on both sides that cooperate with the membrane elements. The cleaning assembly also includes a vertically movable frame. When the frame moves downwards, the horizontal plates move downwards, and the scrapers clean the outer surface of the membrane elements downwards. At the bottom of the treatment tank is a collection assembly, which includes a support with a movable scraper. A collection box is located on one side of the support, and the collection box opens when the scraper moves to one side.

[0006] Each membrane element includes a membrane plate, with a clamping plate at the upper end and clamping seats on both sides at the lower end of the membrane plate. The assembly frame has multiple slots at both the upper and lower ends that cooperate with the clamping plates and clamping seats.

[0007] The assembly frame is equipped with an I-shaped water pipe, and multiple guide pipes are provided on both sides of the I-shaped water pipe. The lower ends of the guide pipes are all connected to both sides of the card plate.

[0008] The lower end of the assembly frame is provided with an aeration element, which includes two air supply pipes and multiple aeration pipes between the two air supply pipes.

[0009] The bottom inner wall of the processing box is provided with two multi-stage telescopic rods. The frames are all set at the telescopic ends of the multi-stage telescopic rods and are slidably connected to the inner wall of the processing box. The upper end of the frame is provided with a T-shaped connecting frame, and multiple U-shaped drive frames are provided on the T-shaped connecting frame. The horizontal plate is installed at the lower end of the corresponding U-shaped drive frame.

[0010] The scraper blades are slidably connected to the inner walls of the left and right ends of the horizontal plate. Guide plates are also slidably connected to the inner walls of the front and rear ends of the horizontal plate. The inner walls of the scraper blades are provided with first sliding pins. The inner walls of the left and right ends of the guide plates are provided with upper vertical grooves, first oblique grooves and lower vertical grooves that cooperate with the first sliding pins.

[0011] The scraper is slidably connected to the inner wall of the upper end of the support. Long pins are fixed to the front and rear end faces of the scraper. Rotatable spur gears are provided on the inner walls of the front and rear ends of the processing box. Telescopic swing rods are provided on the inner sides of the two spur gears. Each telescopic swing rod includes an outer swing rod and an inner swing rod. The inner swing rod is slidably connected to the inner wall of the outer swing rod. The outer swing rod is coaxially fixed to the corresponding spur gear. The lower end of the inner swing rod is rotatably connected to the outer surface of the corresponding long pin.

[0012] The inner walls of the frame are slidably connected with spur racks that cooperate with spur gears. The upper and lower sides of the inner walls at the front and rear ends of the processing box are respectively fixed with a first wedge block and a second wedge block that cooperate with the spur racks. The inner wall at the left end of the processing box is provided with a tension spring that cooperates with the scraper.

[0013] The processing box has sliding track plates on both the front and rear sides of the lower inner wall. The outer ends of the two long pins are provided with extension pins. The track plates are provided with short inclined grooves and long horizontal grooves that cooperate with the extension pins. The upper surface of the track plates is fixed with guide frames. The collection box includes a box body and a sealing cover. When the two guide frames move inward, the sealing cover can be flipped upward.

[0014] The sealing cover is hinged to the upper end of the box body. Long cylindrical cams are coaxially fixed on both sides of the sealing cover. Square sliders that are slidably connected to the guide frame are sleeved on the outer surface of the long cylindrical cams. Two second sliding pins that cooperate with the long cylindrical cams are fixed to the inner wall of the square sliders.

[0015] Compared with the prior art, the present invention has the following advantages: In operation, wastewater is injected into the treatment tank, where it is purified and filtered through the membrane biofilm assembly. When the frame moves downwards, it drives the horizontal plate and scraper to move downwards simultaneously. As the scraper moves downwards, it contacts and scrapes the outer surface of the membrane element, removing impurities adhering to it. The scraper pushes the impurities into the support. When the scraper moves to one side, approaching the collection box, the upper port of the collection box opens. The scraper, moving in tandem with the material, pushes impurities from the upper part of the support into the collection box. This device directly scrapes impurities adhering to the outer surface of the membrane element, quickly and effectively removing suspended solids, colloidal particles, microbial flocs, and other pollutants from the membrane surface. Compared to traditional methods such as aeration scrubbing and backwashing, scraping removes pollutants more specifically and effectively, significantly reducing the membrane flux decay rate, minimizing transmembrane pressure rise, and significantly improving the long-term stable operation of the membrane bioreactor. After scraping impurities to the designated location, the device can collect them centrally. This centralized system completely solves the problem of impurities easily redispersing into the wastewater and causing secondary pollution of membrane elements in existing cleaning methods. The collected impurities can be treated uniformly in subsequent processes, which not only further ensures the wastewater purification effect but also reduces the adverse effects of the cyclic accumulation of pollutants in the wastewater on the treatment system, improving the rationality of the overall treatment process. The efficient scraping and decontamination method reduces damage to membrane elements, avoiding frequent replacements due to severe membrane fouling and significantly extending the service life of membrane elements. At the same time, it eliminates the need for large amounts of clean water for backwashing, reducing the frequency of chemical cleaning agent use, lowering water consumption, agent costs, and subsequent chemical wastewater treatment costs, and improving the economic efficiency of equipment operation. The effective control of membrane fouling and the avoidance of secondary pollution enable the membrane bioreactor to continuously and stably perform its efficient purification function, ensuring that the effluent quality meets reuse standards, improving the reliability and safety of wastewater reuse. It can be widely applied to the purification and reuse of various wastewaters, such as domestic sewage and industrial wastewater, providing strong support for water resource recycling and demonstrating significant environmental and social benefits. Attached Figure Description

[0016] Figure 1 This is an isometric view of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0017] Figure 2 This is a cross-sectional view of the treatment tank of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of the treatment tank of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0019] Figure 4 This is a schematic diagram of the assembly frame installation for a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0020] Figure 5 This is a schematic diagram of the installation of the I-shaped water pipe in a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0021] Figure 6 This is a schematic diagram of the aeration pipe installation of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0022] Figure 7 This is a schematic diagram of the membrane element installation of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0023] Figure 8 This is a schematic diagram of the plate installation of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0024] Figure 9 This is a schematic diagram of the scraper installation of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0025] Figure 10 This is a schematic diagram of the support installation of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0026] Figure 11 This is a schematic diagram of the external swing arm installation of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0027] Figure 12 This is a schematic diagram of the track plate installation for a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0028] Figure 13 This is a schematic diagram of the collection box structure of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0029] Figure 14This is a three-dimensional model of a wastewater purification and reuse device based on a membrane bioreactor according to the present invention.

[0030] Numbering in the diagram: 1-Processing box, 2-Assembly frame, 3-I-shaped water pipe, 4-Guide pipe, 5-Aeration pipe, 6-Air supply pipe, 7-Slot, 8-Card plate, 9-Membrane element, 10-Card holder, 11-U-shaped drive frame, 12-Horizontal plate, 13-Scraper, 14-First sliding pin, 15-Guide plate, 16-Pad plate, 17-Upper vertical groove, 18-First inclined groove, 19-Lower vertical groove, 20-Multi-stage telescopic rod, 21-Frame, 22-T-shaped connecting frame 23-Straight rack, 24-First wedge-shaped stop, 25-Second wedge-shaped stop, 26-Straight gear, 27-Outer swing rod, 28-Inner swing rod, 29-Long pin, 30-Support, 31-Scraper, 32-Tension spring, 33-Extension pin, 34-Trajectory plate, 35-Short inclined groove, 36-Long transverse groove, 37-Guide frame, 38-Square slider, 39-Box body, 40-Sealing cover, 41-Long cylindrical cam, 42-Long threaded rod, 43-Second sliding pin. Detailed Implementation

[0031] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] like Figures 1-14 As shown, this invention provides a wastewater purification and reuse device based on a membrane bioreactor, including a treatment tank 1. The treatment tank 1 is equipped with a membrane bioreactor assembly, which includes an assembly frame 2 and multiple membrane elements 9. The treatment tank 1 is also equipped with a cleaning assembly, which includes multiple horizontal plates 12. Each horizontal plate 12 has a scraper 13 on both sides that cooperates with the membrane elements 9. The cleaning assembly also includes a frame 21 that can move up and down. When the frame 21 moves downward, the horizontal plates 12 can move downward, and the scrapers 13 can scrape the outer surface of the membrane elements 9 downward. The bottom of the treatment tank 1 is equipped with a collection assembly, which includes a support 30. The support 30 has a movable scraper 31, and a collection box is also provided on one side of the support 30. When the scraper 31 moves to one side, the collection box can be opened.

[0033] like Figures 1-10As shown, the treatment tank 1 is used to hold treated wastewater. Wastewater is injected into the treatment tank 1. The assembly frame 2 is fixed to the inner wall of the treatment tank 1. The assembly frame 2 is used to install membrane elements 9 and other components. Through the set membrane bio-component, i.e., membrane element 9, the wastewater can be purified and filtered. Through the set cleaning components, i.e., horizontal plate 12, scraper 13, frame 21, etc., when the frame 21 moves downward, it can drive the horizontal plate 12, scraper 13, etc., to move downward synchronously. When the scraper 13 moves downward, through contact and cooperation with the membrane element 9, it can scrape downward on the outer surface of the membrane element 9, thereby cleaning the impurities adhering to the outer surface of the membrane element 9. Furthermore, under the pushing action of the scraper 13, impurities can fall into the designated location, namely the support 30. Through the set collection components, namely the scraper 31, the support 30, and the collection box, when the scraper 31 moves to one side, that is, gradually approaches the collection box, the upper port of the collection box can open. Combined with the movement of the scraper 31, the impurities on the upper end of the support 30 are pushed into the collection box. This device can quickly and effectively remove pollutants such as suspended solids, colloidal particles, and microbial flocs from the membrane surface by directly scraping the impurities adhering to the outer surface of the membrane element 9. Compared with traditional aeration scrubbing and backwashing methods, scraping is more targeted and effective in removing pollutants. This method significantly reduces the membrane flux decay rate and the magnitude of transmembrane pressure rise, thereby significantly improving the long-term stable operation capability of the membrane bioreactor. After scraping impurities to a designated location, the device can collect them centrally, completely solving the problem of impurities easily redispersing into the wastewater and causing secondary pollution of the membrane element 9 in existing cleaning methods. The centrally collected impurities can be treated uniformly afterwards, which not only further ensures the wastewater purification effect but also reduces the adverse effects of pollutant circulation and accumulation in the wastewater on the treatment system, improving the overall rationality of the treatment process. The efficient scraping and decontamination method reduces damage to the membrane element 9, avoiding frequent replacements of the membrane element 9 due to severe membrane fouling. This significantly extends the service life of membrane element 9; at the same time, it eliminates the need for large amounts of clean water for backwashing, reducing the frequency of chemical cleaning agent use, lowering water consumption, agent costs, and subsequent chemical waste treatment costs, thus improving the economic efficiency of equipment operation; effective control of membrane fouling and avoidance of secondary pollution enable the membrane bioreactor to continuously and stably perform efficient purification, ensuring that the effluent quality meets reuse standards, improving the reliability and safety of wastewater reuse, and making it widely applicable to various wastewater purification and reuse scenarios such as domestic sewage and industrial wastewater, providing strong support for water resource recycling, and having significant environmental and social benefits.

[0034] Each membrane element 9 includes a membrane plate, with a clamping plate 8 at the upper end of each membrane plate and clamping seats 10 on both sides of the lower end of each membrane plate. The assembly frame 2 has multiple slots 7 at both the upper and lower ends that cooperate with the clamping plate 8 and the clamping seats 10.

[0035] like Figures 7-8As shown, the card plate 8 and the card holder 10 are both interference-fitted into the inner wall of the card slot 7, so that the membrane element 9 can be disassembled; the inner walls of the card plate 8 and the card holder 10 are provided with grooves, and the membrane plates are inserted into the corresponding grooves, so that the membrane element 9 is integrated; the membrane plates are existing technology and will not be described in detail.

[0036] The assembly frame 2 is equipped with an I-shaped water pipe 3, and multiple guide pipes 4 are provided on both sides of the I-shaped water pipe 3. The lower ends of the guide pipes 4 are all connected to both sides of the card plate 8.

[0037] like Figure 5 and Figure 8 As shown, both sides of the card plate 8 are provided with through holes, and the guide pipe 4 is connected to the inner wall of the through holes. The upper end of the I-shaped clear water pipe 3 is connected to a clear water pump and a chemical pump. The pipe is also equipped with a valve to control the working pipeline of the clear water pump and the chemical pump. When the clear water pump is working, it can generate suction, so that the sewage in the treatment tank 1 is filtered through the membrane plate, passes through the card plate 8, the guide pipe 4, and the I-shaped clear water pipe 3 to the inside of the clear water pump, and is discharged to a designated location. The clear water pump is existing technology and will not be described in detail. When the chemical pump is working, it can inject chemicals into the membrane plate to chemically clean the membrane plate, but it is easy to cause secondary pollution.

[0038] The lower end of the assembly frame 2 is provided with an aeration element, which includes two air supply pipes 6 and multiple aeration pipes 5 between the two air supply pipes 6.

[0039] like Figure 6 As shown, the air supply pipe 6 is fixed to the lower end of the assembly frame 2 by a clamp. Multiple air jets are opened on the outer surface of the aeration pipe 5. One end of the air supply pipe 6 is connected to an air pump. When the air pump is working, it can spray gas into the assembly frame 2. The gas flows upward under the action of buoyancy, thereby flushing the outer surface of the membrane plate, reducing the adhesion of pollutants, and extending the cleaning cycle.

[0040] The bottom inner wall of the processing box 1 is provided with two multi-stage telescopic rods 20. The frames 21 are all set at the telescopic ends of the multi-stage telescopic rods 20. The frames 21 are all slidably connected to the inner wall of the processing box 1. The upper end of the frames 21 is provided with T-shaped connecting frames 22. The T-shaped connecting frames 22 are provided with multiple U-shaped drive frames 11. The horizontal plates 12 are all installed at the lower end of the corresponding U-shaped drive frames 11.

[0041] like Figures 7-8 , Figure 10As shown, the frame 21 can slide vertically to the inner walls of the front and rear ends of the processing box 1. The T-shaped connecting frame 22 is fixed to the lower surface of the frame 21, and the U-shaped drive frame 11 is fixed to the T-shaped connecting frame 22. When the frame 21 moves up and down, the T-shaped connecting frame 22, the drive U-shaped drive frame 11, the horizontal plate 12, etc. can move up and down. The upper end of the multi-stage telescopic rod 20 is fixed to the lower end of the frame 21. When the multi-stage telescopic rod 20 is working, it can drive the frame 21 to move up and down, that is, drive the T-shaped connecting frame 22, the U-shaped drive frame 11, and the horizontal plate 12 to move up and down. The multi-stage telescopic rod 20 is existing technology and will not be described in detail.

[0042] The scraper blades 13 are all slidably connected to the inner walls of the left and right ends of the horizontal plate 12. The inner walls of the front and rear ends of the horizontal plate 12 are also slidably connected to guide plates 15. The inner walls of the scraper blades 13 are provided with first sliding pins 14. The inner walls of the left and right ends of the guide plates 15 are provided with upper vertical grooves 17, first inclined grooves 18 and lower vertical grooves 19 that cooperate with the first sliding pins 14.

[0043] like Figures 10-11As shown, the scraper 13 is slidably connected to the inner wall of the horizontal plate 12, and the guide plate 15 is slidably connected to the inner wall of the horizontal plate 12, and the first sliding pin 14 is fixed to the inner wall of the scraper 13. When the guide plate 15 moves from bottom to top on the inner wall of the horizontal plate 12, the first sliding pin 14, in engagement with the upper vertical groove 17, the first inclined groove 18, and the lower vertical groove 19, can slide from the inner wall of the upper vertical groove 17 through the first inclined groove 18 into the inner wall of the lower vertical groove 19. At this time, the two first sliding pins 14 and the scraper 13 can move inward, that is, the scraper 13 can disengage from the diaphragm. When the horizontal plate 12 moves upward to reset, it can prevent impurities on the outer surface of the diaphragm from being scraped upward. When the guide plate 15 moves from top to bottom on the inner wall of the horizontal plate 12, The first sliding pin 14 can slide from the inner wall of the lower vertical groove 19 through the first inclined groove 18 into the inner wall of the upper vertical groove 17. At this time, the first sliding pin 14 and the scraper 13 can move outward, that is, the scraper 13 contacts the outer surface of the diaphragm plate again. When the horizontal plate 12 and the scraper 13 move downward, they can clean the outer surface of the diaphragm plate. There is a certain friction between the guide plate 15 and the horizontal plate 12. That is, when the horizontal plate 12 moves up and down without external force, it can drive the guide plate 15 to move up and down synchronously. When the first sliding pin 14 engages with the upper vertical groove 17 or the lower vertical groove 19, it can lock the position of the first sliding pin 14 and the scraper 13. That is, when the guide plate 15 does not move, the scraper 13 and the first sliding pin 14 will not move inward or outward. The outward movement allows the scraper 13 to stably contact or detach from the outer surface of the diaphragm plate. Both the upper and lower surfaces of the guide plate 15 are provided with pads 16 that cooperate with the clamping plate 8 and the clamping seat 10. When the horizontal plate 12, guide plate 15, and scraper 13 move synchronously downwards, the scraper 13 is at its outermost end, and the guide plate 15 is at its lowest position on the horizontal plate 12. As the scraper 13 moves downwards, it can scrape the outer surface of the diaphragm plate downwards. When the horizontal plate 12, guide plate 15, scraper 13, and pads 16 move downwards to a designated position, the pads 16 can contact the upper surface of the clamping seat 10. At this point, the clamping seat 10 can block and limit the pads 16 and guide plate 15, and the guide plate 15 no longer moves downwards. When the horizontal plate 12... When the scraper 13 and other components continue to move downwards, the scraper 13 can move inwards under the engagement of the first sliding pin 14 with the upper vertical groove 17, the first inclined groove 18 and the lower vertical groove 19, that is, the scraper 13 disengages from the diaphragm plate. When the horizontal plate 12 moves upwards to reset, it prevents the scraper 13 from scraping impurities upwards. When the horizontal plate 12, guide plate 15, scraper 13 and other components move upwards to make the pad 16 contact the clamping plate 8, it can block the limiting guide plate 15 from continuing to move upwards. That is, when the corresponding horizontal plate 12 continues to move upwards, under the engagement of the first sliding pin 14 with the lower vertical groove 19, the first inclined groove 18 and the upper vertical groove 17, the scraper 13 can move outwards, that is, the scraper 13 contacts the diaphragm plate again, so that the scraper 13 can scrape impurities downwards in one direction.

[0044] The scraper 31 is slidably connected to the inner wall of the upper end of the support 30. Long pins 29 are fixedly connected to the front and rear end faces of the scraper 31. Rotatable spur gears 26 are provided on the inner walls of the front and rear ends of the processing box 1. Telescopic swing rods are provided on the inner sides of the two spur gears 26. Each telescopic swing rod includes an outer swing rod 27 and an inner swing rod 28. The inner swing rods 28 are slidably connected to the inner wall of the outer swing rod 27. The outer swing rods 27 are coaxially fixedly connected to the corresponding spur gears 26. The lower ends of the inner swing rods 28 are rotatably connected to the outer surface of the corresponding long pins 29.

[0045] like Figures 10-12 As shown, the support 30 is fixed to the inner wall of the bottom end of the processing box 1. The scraper 31 can slide left and right on the inner wall of the upper end of the support 30. The spur gear 26 and the inner wall of the outer swing rod 27 are fixed with a rotating shaft. The rotating shaft is rotatably connected to the inner wall of the processing box 1. When the spur gear 26 rotates, it can drive the outer swing rod 27 and the inner swing rod 28 to swing left and right. The inner swing rod 28 can slide up and down on the inner wall of the outer swing rod 27. The lower end of the inner swing rod 28 is equivalent to being hinged to both sides of the scraper 31. When the spur gear 26 rotates, it can drive the telescopic swing rod to swing to the right. When the telescopic swing rod swings to the right, it can drive the long pin 29, the scraper 31, etc. to move to the right synchronously. That is, the scraper 31 can slide to the right along the inner wall of the support 30 and push the impurities on the inner wall of the support 30 into the collection box. When the scraper 31 moves, the telescopic swing rod can retract or extend. That is, the inner swing rod 28 can slide on the inner wall of the outer swing rod 27.

[0046] The inner wall of the frame 21 is slidably connected with a spur rack 23 that cooperates with the spur gear 26. The upper and lower sides of the inner walls at the front and rear ends of the processing box 1 are respectively fixed with a first wedge block and a second wedge block that cooperates with the spur rack 23. The inner wall at the left end of the processing box 1 is provided with a tension spring 32 that cooperates with the scraper 31.

[0047] like Figures 10-12 As shown, the rack 23 can slide back and forth on one side of the frame 21. When the frame 21 moves up and down, it can drive the rack 23 to move up and down. When the two racks 23 are at the inner end, they are misaligned with the spur gear 26. When the frame 21 and rack 23 move downward, they will not mesh with the spur gear 26. When the two racks 23 are at the outer end, they are at the same horizontal plane as the spur gear 26. When the frame 21 and rack 23 move upward, the meshing of the rack 23 and spur gear 26 can drive the spur gear 26 to rotate. One end of the tension spring 32 is fixed to the inner wall of the left end of the processing box 1, and the other end of the tension spring 32 is fixed to the scraper 31. The tension spring 32 always exerts a leftward pulling force on the scraper 31, so that the scraper 31 is in the leftmost position under normal conditions. Figure 11As shown, with the first wedge-shaped stop 24 and the second wedge-shaped stop 25, when the frame 21 moves downward, the rack 23 is at its inner end. As the frame 21 and rack 23 move downward, they will not encounter the spur gear 26. That is, the corresponding horizontal plate 12 and scraper 13 can clean the diaphragm plate during operation. When the frame 21 and rack 23 continue to move downward, the rack 23 can encounter the inclined surface of the second wedge-shaped stop 25. Under the blocking engagement of the second wedge-shaped stop 25, the frame 21 and rack 23 continue... When moving downwards, the rack 23 can move downwards and outwards simultaneously. When the frame 21 and rack 23 reach their bottom positions, i.e., when rack 23 reaches its outermost position, the horizontal plate 12 and scraper 13 also reach their bottom positions, thus completing the cleaning of the diaphragm. At this point, the cleaned impurities fall into the support 30. When the frame 21 and rack 23 move upwards to reset, rack 23, while moving upwards, can mesh with spur gear 26, causing spur gear 26 to rotate. As spur gear 26 rotates... The mechanism drives the telescopic swing arm to swing to the right, the scraper 31 to move to the right, and stretches the tension spring 32. This means the scraper 31 pushes impurities from the support 30 into the collection box. When the frame 21 continues to move upwards until the rack 23 disengages from the spur gear 26, the scraper 31 and telescopic swing arm will move to the left and reset under the tension of the tension spring 32. When the frame 21 continues to move upwards until the rack 23 meets and engages with the inclined surface of the first wedge-shaped stop 24, further upward movement of the frame 21 will cause the rack 23 to move upwards and inwards simultaneously. The frame 21 moves to the side, causing the rack 23 to be misaligned with the spur gear 26 again. That is, when the frame 21 moves downward, it will not drive the scraper 31 to work. The corresponding scraper blade 13 moves downward to clean the outer surface of the diaphragm. When the frame 21 moves upward to reset, it can drive the scraper 31 to work. The scraper blade 13 and the scraper 31 can work in sequence. There is a certain friction between the frame 21 and the rack 23. Under normal conditions, when the frame 21 moves up and down, it can drive the rack 23 to move up and down synchronously. The rack 23 will not slide back and forth.

[0048] The processing box 1 has a track plate 34 slidably connected to both the front and rear sides of the lower inner wall. The outer ends of the two long pins 29 are provided with extension pins 33. The track plate 34 is provided with short inclined grooves 35 and long horizontal grooves 36 that cooperate with the extension pins 33. The upper surface of the track plate 34 is fixedly connected with guide frames 37. The collection box includes a box body 39 and a sealing cover 40. When the two guide frames 37 move inward, the sealing cover 40 can be flipped upward.

[0049] like Figures 12-13As shown, the track plate 34 is slidably connected to the inner wall of the bottom of the processing box 1. Support seats are fixed to the outer end faces of the long pins 29, and extension pins 33 are fixed to the inner walls of the support seats, which is equivalent to the extension pins 33 being fixed to the outer end faces of the long pins 29. The installation and shape of the extension pins 33, track plate 34, and guide frame 37 are as follows: Figure 12 As shown, the guide frame 37 is fixed to the upper surface of the track plate 34. When the long pin 29 and the extension pin 33 move to the right, the track plate 34 and the guide plate 15 can move inward through the engagement of the extension pin 33 and the short inclined groove 35. When the long pin 29 and the extension pin 33 continue to move to the right until the extension pin 33 enters the inner wall of the long horizontal groove 36, the track plate 34 and the guide frame 37 are in the innermost stable state, that is, they will not move inward or outward. When the guide frame 37 moves inward, the sealing cover 40 can be flipped upward, thereby opening the collection box. The sealing cover 40, the box body 39 and the inner wall of the support 30 are all provided with filtration holes, which can filter the moisture in the impurities.

[0050] The sealing cover 40 is hinged to the upper end of the box body 39. Both sides of the sealing cover 40 are coaxially fixed with long cylindrical cams 41. The outer surface of the long cylindrical cams 41 is fitted with square sliders 38 that are slidably connected to the guide frame 37. The inner wall of the square sliders 38 is fixed with two second sliding pins 43 that cooperate with the long cylindrical cams 41.

[0051] like Figures 12-13 As shown, a rotating shaft is fixedly connected to the inner wall of the long cylindrical cam 41 and the sealing cover 40. Bearing seats are rotatably connected to both sides of the outer surface of the rotating shaft. The bottom ends of the bearing seats are fixed to the upper surface of the box 39, effectively hinged the sealing cover 40 to the upper end of the box 39. When the long cylindrical cam 41 rotates, it can drive the sealing cover 40 to flip up and down. The square slider 38 can slide up and down on the inner wall of the guide frame 37. When the guide frame 37 and the square slider 38 move inward, they can drive the second sliding pin 43 to move inward. Under the engagement of the second sliding pin 43 and the long cylindrical cam 41, the long cylindrical cam 41 can rotate, causing the sealing cover 40 to flip upward and open. Similarly, when the guide frame 37 moves outward, it can drive the sealing cover 40 to flip downward and close. Figure 10As shown, a motor is also provided on one side of the processing box 1. A long threaded rod 42 is provided at the motor output end. The long threaded rod 42 is rotatably connected to the inner wall of the processing box 1 via a bearing seat. A threaded slider is threadedly connected to the outer surface of the long threaded rod 42. The threaded slider slides up and down on the inner wall of the processing box 1. The box body 39 is fixed to the threaded slider. When the motor starts, it can drive the long threaded rod 42 to rotate, and the threaded slider, collection box, etc., to move upwards, causing the collection box to move to the upper end of the processing box 1 for convenient centralized processing of impurities inside the collection box. When in use, by controlling the frame 21 to move downward, the horizontal plate 12 and the scraper 13 can move downward. The scraper 13 scrapes the outer surface of the membrane plate, and the impurities fall into the support 30 after being scraped. When the frame 21 moves upward to reset, the scraper 31, the long pin 29, etc. can move to the right to scrape and push the impurities inside the support 30 into the collection box. At the same time, when the long pin 29 moves to the right, the sealing cover 40 can be flipped upward, that is, the collection box is opened, so as to facilitate the acceptance of impurities in the support 30.

[0052] In use, wastewater is injected into the treatment tank 1, and the wastewater is purified and filtered through the membrane bio-component. When the frame 21 moves downward, it drives the horizontal plate 12 and scraper 13 to move downward simultaneously. When the scraper 13 moves downward, it scrapes the outer surface of the membrane element 9 through contact with the membrane element 9, thereby cleaning the impurities adhering to the outer surface of the membrane element 9. Under the push of the scraper 13, the impurities fall into the support 30. When the scraper 31 moves to one side, that is, gradually approaches the collection box... The upper port of the collection box can be opened, and with the movement of the scraper 31, impurities on the upper end of the support 30 are pushed into the collection box. This device directly scrapes impurities adhering to the outer surface of the membrane element 9, which can quickly and effectively remove pollutants such as suspended solids, colloidal particles, and microbial flocs from the membrane surface. Compared with traditional aeration scrubbing and backwashing methods, scraping is more targeted and effective in removing pollutants, which can significantly reduce the membrane flux decay rate, reduce the transmembrane pressure rise, and significantly improve the long-term stable operation capability of the membrane bioreactor. Once located, the membrane bioreactor can collect impurities centrally, completely solving the problem of secondary pollution of membrane elements 9 caused by the easy redispersing of impurities into the wastewater in existing cleaning methods. The centrally collected impurities can be uniformly treated later, which not only further ensures the wastewater purification effect but also reduces the adverse effects of the cyclic accumulation of pollutants in the wastewater on the treatment system, improving the rationality of the overall treatment process. The efficient scraping and decontamination method reduces damage to membrane elements 9, avoiding frequent replacement of membrane elements 9 due to severe membrane fouling, and significantly extending the service life of membrane elements 9. At the same time, it eliminates the need for large amounts of clean water for backwashing, reducing the frequency of chemical cleaning agents used, lowering water consumption, agent costs, and subsequent chemical waste treatment costs, and improving the economic efficiency of equipment operation. The effective control of membrane fouling and the avoidance of secondary pollution enable the membrane bioreactor to continuously and stably perform efficient purification, ensuring that the effluent quality meets reuse standards, improving the reliability and safety of wastewater reuse. It can be widely applied to the purification and reuse of various wastewaters such as domestic sewage and industrial wastewater, providing strong support for water resource recycling and having significant environmental and social benefits.

Claims

1. A wastewater purification and reuse device based on a membrane bioreactor, comprising a treatment tank (1), characterized in that: The processing box (1) is equipped with a membrane bio-assembly, which includes an assembly frame (2) and multiple membrane elements (9) on the assembly frame (2). The processing box (1) is also equipped with a cleaning assembly, which includes multiple horizontal plates (12). Both sides of the horizontal plates (12) are equipped with scrapers (13) that cooperate with the membrane elements (9). The cleaning assembly also includes a frame (21) that can move up and down. When the frame (21) moves down, the horizontal plates (12) can move down and the scrapers (13) can scrape the outer surface of the membrane elements (9) downward. The bottom of the processing box (1) is equipped with a collection assembly, which includes a support (30). The support (30) is equipped with a movable scraper (31). A collection box is also provided on one side of the support (30). When the scraper (31) moves to one side, the collection box can be opened.

2. The wastewater purification and reuse device based on a membrane bioreactor as described in claim 1, characterized in that: Each membrane element (9) includes a membrane plate, with a card plate (8) at the upper end of each membrane plate and card seats (10) on both sides of the lower end of each membrane plate. The assembly frame (2) has multiple slots (7) at both the upper and lower ends that cooperate with the card plate (8) and card seats (10).

3. The wastewater purification and reuse device based on a membrane bioreactor as described in claim 2, characterized in that: The assembly frame (2) is provided with an I-shaped water pipe (3), and multiple guide pipes (4) are provided on both sides of the I-shaped water pipe (3). The lower ends of the guide pipes (4) are connected to both sides of the card plate (8).

4. The wastewater purification and reuse device based on a membrane bioreactor as described in claim 1, characterized in that: The lower end of the assembly frame (2) is provided with an aeration element, which includes two air supply pipes (6) and multiple aeration pipes (5) between the two air supply pipes (6).

5. A wastewater purification and reuse device based on a membrane bioreactor as described in claim 1, characterized in that: The bottom inner wall of the processing box (1) is provided with two multi-stage telescopic rods (20), and the frames (21) are all set at the telescopic ends of the multi-stage telescopic rods (20). The frames (21) are all slidably connected to the inner wall of the processing box (1). The upper end of the frames (21) is provided with T-shaped connecting frames (22), and multiple U-shaped drive frames (11) are provided on the T-shaped connecting frames (22). The horizontal plates (12) are all installed at the lower end of the corresponding U-shaped drive frames (11).

6. A wastewater purification and reuse device based on a membrane bioreactor as described in claim 1, characterized in that: The scraper blades (13) are all slidably connected to the inner walls of the left and right ends of the horizontal plate (12). The inner walls of the front and rear ends of the horizontal plate (12) are also slidably connected to guide plates (15). The inner walls of the scraper blades (13) are provided with first sliding pins (14). The inner walls of the left and right ends of the guide plates (15) are provided with upper vertical grooves (17), first inclined grooves (18) and lower vertical grooves (19) that cooperate with the first sliding pins (14).

7. A wastewater purification and reuse device based on a membrane bioreactor as described in claim 1, characterized in that: The scraper (31) is slidably connected to the inner wall of the upper end of the support (30). Long pins (29) are fixedly connected to the front and rear end faces of the scraper (31). The inner walls of the front and rear ends of the processing box (1) are provided with rotatable spur gears (26). The inner sides of the two spur gears (26) are provided with telescopic swing rods. The telescopic swing rods include an outer swing rod (27) and an inner swing rod (28). The inner swing rods (28) are slidably connected to the inner wall of the outer swing rods (27). The outer swing rods (27) are coaxially fixedly connected to the corresponding spur gears (26). The lower ends of the inner swing rods (28) are rotatably connected to the outer surface of the corresponding long pins (29).

8. A wastewater purification and reuse device based on a membrane bioreactor as described in claim 7, characterized in that: The inner wall of the frame (21) is slidably connected with a spur rack (23) that cooperates with the spur gear (26). The upper and lower sides of the inner walls at the front and rear ends of the processing box (1) are respectively fixed with a first wedge block and a second wedge block that cooperates with the spur rack (23). The inner wall at the left end of the processing box (1) is provided with a tension spring (32) that cooperates with the scraper (31).

9. A wastewater purification and reuse device based on a membrane bioreactor as described in claim 7, characterized in that: The processing box (1) has a track plate (34) slidably connected to both the front and rear sides of the lower inner wall. The outer ends of the two long pins (29) are provided with extension pins (33). The track plate (34) is provided with short inclined grooves (35) and long horizontal grooves (36) that cooperate with the extension pins (33). The upper surface of the track plate (34) is fixed with guide frames (37). The collection box includes a box body (39) and a sealing cover (40). When the two guide frames (37) move inward, the sealing cover (40) can be flipped upward.

10. A wastewater purification and reuse device based on a membrane bioreactor as described in claim 9, characterized in that: The sealing cover (40) is hinged to the upper end of the box body (39). Both sides of the sealing cover (40) are coaxially fixed with long cylindrical cams (41). The outer surface of the long cylindrical cams (41) is fitted with square sliders (38) that are slidably connected to the guide frame (37). The inner wall of the square sliders (38) is fixed with two second sliding pins (43) that cooperate with the long cylindrical cams (41).

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