A three-phase composite cleaning membrane treatment device and its usage method

Abstract

The present invention discloses a three-phase composite cleaning membrane treatment device and its usage method, including a reaction membrane tank. A plurality of plate-type ceramic membrane sheets are arranged in the reaction membrane tank, and the plurality of plate-type ceramic membrane sheets are respectively installed in parallel in the reaction membrane tank. A water branch pipe is installed at the upper end interface of the plate-type ceramic membrane sheet, and the water branch pipe is installed at the upper end of the reaction membrane tank through a bracket. A sewage reflux device is installed at the upper end of the bracket. The sewage reflux device includes a particle separation mechanism and a sludge discharge mechanism. The particle separation mechanism includes a separation pipe and a separator, and the separator is connected to the separation pipe. The sewage reflux device is movably connected to a suction main pipe. By placing a large number of scrubbing particles in the membrane tank in the novel membrane treatment device designed by the present invention, the cleaning effect of the membrane surface is enhanced in-situ and online by using the three-phase friction of water, gas, and particles, greatly improving the membrane usage efficiency, reducing the operation and maintenance workload, and at the same time reducing the energy consumption of membrane scrubbing, achieving multiple benefits with one action.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic membrane solid-liquid separation, and particularly to a three-phase composite cleaning membrane treatment device and a using method thereof. Background Art

[0002] In the water treatment process, the solid-liquid separation method based on ceramic membranes has been widely applied at home and abroad. Compared with the organic composite membrane separation process, the inorganic ceramic membrane separation technology has obtained good treatment effects in various water treatment fields due to its excellent characteristics such as acid and alkali resistance, oil and grease resistance, organic pollution resistance, wear resistance, high flux, easy recycling and regeneration, and no secondary pollution.

[0003] Through the popularization and application in recent years, it has been found that although the ceramic membrane has excellent anti-pollution characteristics, after being used for a certain period of time, the pollution on the membrane surface is still serious. Due to the interception effect of the membrane and the negative pressure inside the membrane, particulate matters are easily attracted to the membrane surface to form a filter cake layer, which reduces the membrane flux, or adheres to the membrane surface to form a filter cake layer due to the growth of microorganisms, affecting normal production. And the offline cleaning of the membrane module requires disassembling and flushing each membrane module piece by piece, and the process is cumbersome and arduous.

[0004] In view of the above problems, the present invention has developed a new type of membrane treatment device and a using method thereof. By placing a large number of scrubbing particles in the membrane tank and utilizing the three-phase friction of water, gas, and particles, the cleaning effect on the membrane surface is enhanced in-situ and online, greatly improving the use efficiency of the membrane, reducing the operation and maintenance workload, and at the same time reducing the energy consumption of membrane scrubbing, achieving multiple benefits at once. Summary of the Invention

[0005] The purpose of the present invention is to provide a three-phase composite cleaning membrane treatment device and a using method thereof to solve the problems raised in the above background art. By utilizing the three-phase friction of water, gas, and particles, the cleaning effect on the membrane surface is enhanced in-situ and online, greatly improving the use efficiency of the membrane, reducing the operation and maintenance workload, and at the same time reducing the energy consumption of membrane scrubbing.

[0006] To achieve the above object, the present invention provides the following technical solution: A three-phase composite cleaning membrane treatment device, including a reaction membrane tank, in which multiple groups of plate-type ceramic membrane sheets are arranged. At the upper end of one side of the reaction membrane tank, there is a sewage inlet. The multiple groups of plate-type ceramic membrane sheets are respectively installed in parallel in the reaction membrane tank. The upper end interfaces of the plate-type ceramic membrane sheets are installed with water branch pipes. At the upper end of the water branch pipes, there is a negative pressure main pipe. The water branch pipes are connected to the negative pressure main pipe. The water branch pipes are installed at the upper end of the reaction membrane tank through brackets. At the upper end of the brackets, there is a sewage discharge and reflux device. The sewage discharge and reflux device includes a particle separation mechanism and a sludge discharge mechanism. The particle separation mechanism includes a separation pipe and a separator. The separator is connected to the separation pipe. The sewage discharge and reflux device is movably connected to the suction main pipe. The sewage discharge and reflux device is installed on a sliding device at the upper end of the bracket. The sliding device is installed on the support plates at both ends of the reaction membrane tank. The support plates are fixedly connected to the reaction membrane tank. At the upper end of the support plates, there is a fixedly connected sliding device. At the bottom of the reaction membrane tank, there are multiple groups of perforated air washing pipes, and the perforated air washing pipes are intermittently arranged with the plate-type ceramic membrane sheets.

[0007] Preferably, the sliding device includes a lower slide rail and an upper slider. The lower slide rail is slidably connected to the upper slider. The upper end of the upper slider is connected to the sewage discharge and reflux device. On one side of the upper slider, there is a moving motor. The moving motor is connected to the upper slider through a rotating shaft.

[0008] Preferably, the separator is installed with a separation pipe at the lower end. The separation pipe is fixedly installed on one side of the sliding device. The separation pipe extends into the upper ends of the plate-type ceramic membrane sheets in the reaction membrane tank. The separation pipe is perpendicular to the negative pressure main pipe.

[0009] Preferably, the perforated air washing pipe includes an inner pipe and an outer pipe. The inner pipe is embedded in the outer pipe. The inner pipe includes an upper closed circular plate, a front baffle, and a rear baffle. At the lower ends of the front baffle and the rear baffle, there are connecting circular sleeves. The front baffle and the rear baffle are embedded in the outer pipe. The lower end of the outer pipe is connected to the connecting circular sleeve. The upper closed circular plate is fixedly connected to the upper end of the outer pipe.

[0010] Preferably, on the left and right sides of the outer wall of the outer pipe, there are injection holes. The injection holes are arranged between the front baffle and the rear baffle. The injection holes are arranged on the outer wall of the outer pipe and are inclined in a clockwise tangential direction.

[0011] Preferably, the perforated air washing pipes are arranged at the gaps between multiple groups of the plate-type ceramic membrane sheets. The height of the perforated air washing pipes in the membrane tank is less than the height of the plate-type ceramic membrane sheets.

[0012] Preferably, the internal channel of the plate-type ceramic membrane sheet is in an inverted wedge-shaped structure.

[0013] Preferably, sewage and scrubbing particles are placed in the reaction membrane tank. The scrubbing particles are solid resin particles, which are spherical particles. Erasing protrusions are arranged on the periphery of the spherical particles. The erasing protrusions are trapezoidal cylindrical in shape and are evenly arranged on the scrubbing particles.

[0014] A method for using a three-phase composite cleaning membrane treatment device includes the following steps:

[0015] S1: Sewage enters the reaction membrane tank through the water inlet. Internal negative pressure is formed by suction inside the plate-type ceramic membrane, and the sewage is separated. The particulate pollutants are isolated outside the plate-type ceramic membrane, and the clear water flows into the membrane pore channels. The internal flow channel is in an inverted wedge shape to facilitate the upward collection of clear water into the water production branch pipe at the top of the membrane, and finally is collected into the water production main pipe and then sucked out by a suction pump to achieve the purpose of separating sewage.

[0016] S2: During the suction separation process, the adhesions on the surface of the plate-type ceramic membrane gradually increase, and the separation effect deteriorates. At this time, stripping is carried out through the three-phase composite cleaning process of water, gas, and scrubbing particles. By regularly closing the water production suction pump to stop water absorption, instead, clear water is introduced into the water branch pipe from the negative pressure main pipe to form a hydraulic backwash on the surface of the plate-type ceramic membrane, and the flushing direction is perpendicular to the plate-type ceramic membrane; during this process, perforated air washing pipes are arranged at the bottom of the reaction membrane tank for aeration. The gas flows from the inner pipe to the outer pipe. During the flow process, due to the front baffle and rear baffle arranged on the outer pipe, the gas flows to the other two sides and is ejected outward through the ejection holes of the outer pipe, and the ejection direction is aimed at the surface of the plate-type ceramic membrane on both sides of the perforated air washing pipe. At this time, the water contains a large number of resin spherical particles, and the surface of the plate-type ceramic membrane is scrubbed through the erasing protrusions arranged on the surface of the resin spherical particles to achieve the purpose of cleaning.

[0017] S3: During this process, the large and medium-sized pore bubbles formed by the gas drive the resin spherical particles to float upward to scrub the surface of the membrane. The scrubbing direction is parallel to the plate surface. At the same time, the aeration intensity is adjusted according to the degree of pollution of the plate-type ceramic membrane to achieve the cleanliness of scrubbing.

[0018] S4: During the operation of the traditional ceramic membrane solid-liquid separation process, when the plate-type ceramic membrane is performing filtration separation, in order to ensure the concentration and activity of the scrubbing particles in the reaction membrane tank during the cleaning process, the scrubbing particles are recovered and separated for reuse through the sewage drainage and reflux device. The scrubbing particles are put into the reaction membrane tank again through the separator. At the same time, during this process, due to the different positions where the plate-type ceramic membrane is polluted, according to the degree of pollution at different positions, the separated scrubbing particles are sent to the position of the plate-type ceramic membrane with a large degree of pollution through the sliding device arranged on one side of the sewage drainage and reflux device, and the cleaning speed of the plate-type ceramic membrane is accelerated by increasing the concentration of the scrubbing particles to complete the cleaning work of the plate-type ceramic membrane.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) A large number of scrubbing particles are placed in the membrane tank. By utilizing the three-phase friction of water, gas, and particles, the cleaning effect on the membrane surface is enhanced in-situ and online, greatly improving the membrane usage efficiency, reducing the operation and maintenance workload, and at the same time reducing the energy consumption for membrane scrubbing, achieving multiple benefits with one action.

[0021] (2) Through suction negative pressure in the main negative pressure pipe, the sewage in the reaction membrane tank flows towards the plate ceramic membrane for filtration and separation treatment, accelerating the sewage treatment process. At the same time, during the filtration process, the scrubbing particles are recycled through the sewage discharge and reflux device, improving the scrubbing efficiency while saving the scrubbing cost. Through repeated recycling, the technical purpose of continuous scrubbing and continuous purification is achieved while the ceramic membrane is performing purification filtration, forming a circulating operation of the scrubbing particles and ensuring the long-term operation of sewage solid-liquid separation.

[0022] (3) The sliding device can transfer the scrubbing particles separated by the separator to the position of the ceramic membrane with a large degree of pollution according to the pollution degree of the reaction membrane tank. While increasing the concentration of the ceramic membrane with a large degree of pollution, it speeds up the cleaning speed of the ceramic membrane, greatly improving the separation efficiency of the membrane.

[0023] (4) The separation pipe is arranged at the upper end of the plate ceramic membrane and can be accurately delivered to the gap between each plate ceramic membrane for precise scrubbing, improving the positioning accuracy of scrubbing and making the scrubbing effect improve more significantly.

[0024] (5) By setting spherical particles, the ceramic membrane can be cleaned during rotation through the agitation of air flow. The scrubbing protrusions are also set to better improve the scrubbing effect, achieving the technical purpose of rotating scraping of the ceramic membrane and improving the one-time contact and efficient scrubbing of scraping. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the overall structural principle of the three-phase composite cleaning membrane treatment equipment of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the perforated air washing pipe of the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the inner pipe of the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the scrubbing particles of the present invention.

[0029] Figure 5 It is a schematic diagram of the structure of the plate ceramic membrane of the present invention.

[0030] Reference numerals: 1, reaction membrane tank; 2, plate-type ceramic membrane; 3, water branch pipe; 4, negative pressure main pipe; 5, support; 6, sliding device; 7, particle separation mechanism; 8, sludge discharge mechanism; 9, separation pipe; 10, separator; 12, support plate; 13, perforated air washing pipe; 14, suction main pipe; 15, lower slide rail; 16, upper slider; 17, moving motor; 19, inner pipe; 20, outer pipe; 21, upper closed circular plate; 22, front baffle; 23, rear baffle; 24, connecting circular sleeve; 25, injection hole; 26, scrubbing particle; 27, erasing protrusion; 28, water inlet. Detailed implementation manners

[0031] The following content will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings.

[0032] A three-phase composite cleaning membrane treatment device includes a reaction membrane tank 1, in which multiple groups of plate-type ceramic membranes 2 are arranged. At the upper end of one side of the reaction membrane tank 1, there is a sewage inlet 28. Multiple groups of the plate-type ceramic membranes 2 are respectively installed in parallel in the reaction membrane tank 1. The upper end interfaces of the plate-type ceramic membranes 2 are installed with water branch pipes 3. The upper ends of the water branch pipes 3 are provided with a negative pressure main pipe 4. The water branch pipes 3 are connected to the negative pressure main pipe 4. The water branch pipes 3 are installed at the upper end of the reaction membrane tank 1 through a support 5. A sewage discharge and reflux device is installed at the upper end of the support 5. The sewage discharge and reflux device includes a particle separation mechanism 7 and a sludge discharge mechanism 8. The particle separation mechanism 7 includes a separation pipe 9 and a separator 10. The separator 10 is connected to the separation pipe 9. The sewage discharge and reflux device is movably connected to a suction main pipe 14. The sewage discharge and reflux device is installed on a sliding device 6 at the upper end of the support 5. The sliding device 6 is installed on support plates 12 at both ends of the reaction membrane tank 1. The support plates 12 are fixedly connected to the reaction membrane tank 1. The upper ends of the support plates 12 are fixedly connected with the sliding device 6. Multiple groups of perforated air washing pipes 13 are arranged at the bottom of the reaction membrane tank 1. The perforated air washing pipes 13 are intermittently arranged with the plate-type ceramic membranes 2; by performing suction negative pressure in the negative pressure main pipe 4, the sewage in the reaction membrane tank 1 flows towards the plate-type ceramic membranes 2 for filtration and separation treatment, accelerating the sewage treatment process. At the same time, during the filtration process, the scrubbing particles are recycled and reused through the sewage discharge and reflux device, improving the scrubbing efficiency while saving the scrubbing cost, and recycling repeatedly, achieving the technical purpose of continuous scrubbing and continuous purification while the ceramic membranes 2 are performing purification filtration, forming a circulating operation of the scrubbing particles, and ensuring the long-term operation of sewage solid-liquid separation.

[0033] The sliding device 6 includes a lower slide rail 15 and an upper slider 16. The lower slide rail 15 is slidably connected to the upper slider 16. The upper end of the upper slider 16 is connected to a sewage reflux device. A moving motor 17 is provided on one side of the upper slider 16. The moving motor 17 is connected to the upper slider 15 through a rotating shaft. The sliding device 6 can transfer the scrubbing particles separated by the separator to the position of the ceramic membrane with a large degree of pollution according to the pollution degree of the reaction membrane tank 1, while increasing the concentration of the ceramic membrane with a large degree of pollution, accelerating the cleaning speed of the ceramic membrane, and greatly improving the separation efficiency of the membrane.

[0034] A separation pipe 9 is installed at the lower end of the separator 10. The separation pipe 9 is fixedly installed on one side of the sliding device 6. The separation pipe 9 extends into the upper end of the plate-type ceramic membrane 2 in the reaction membrane tank 1. The separation pipe 9 is perpendicular to the negative pressure main pipe 4. The separation pipe 9 is arranged at the upper end of the plate-type ceramic membrane 2 can be accurately delivered to the gap between each plate-type ceramic membrane 2 for accurate scrubbing, improving the positioning accuracy of scrubbing and making the scrubbing effect improve more.

[0035] The perforated air washing pipe 13 includes an inner pipe 19 and an outer pipe 20. The inner pipe 19 is embedded in the outer pipe 20. The inner pipe 19 includes an upper closed circular plate 21, a front baffle 22 and a rear baffle 23. Connecting circular sleeves 24 are installed at the lower ends of the front baffle 22 and the rear baffle 23. The front baffle 22 and the rear baffle 23 are embedded in the outer pipe 20. The lower end of the outer pipe 20 is connected to the connecting circular sleeve 24. The upper closed circular plate 21 is fixedly connected to the upper end of the outer pipe 20. The inner pipe 19 and the outer pipe 2 of the perforated air washing pipe 13 can block the mud in the sewage, prevent the perforated air washing pipe from being blocked, and reduce the air washing effect. The upper closed circular plate 21 is provided in the inner pipe 19 to prevent mud from entering. At the same time, to ensure the air washing effect, the front baffle 22 and the rear baffle 23 are provided to complete the accurate spraying of the outer pipe and can clean the ceramic membranes on both sides.

[0036] Spray holes 25 are provided on the left and right outer walls of the outer pipe 20. The spray holes 25 are arranged between the front baffle 22 and the rear baffle 23. The spray holes 25 are arranged on the outer wall of the outer pipe in a tangential inclination in the clockwise direction.

[0037] The perforated air washing pipe 13 is arranged in the gap between multiple groups of the plate-type ceramic membranes 2. The height of the perforated air washing pipe 13 in the reaction membrane tank 1 is less than the height of the plate-type ceramic membranes 2. The perforated air washing pipe is arranged between the ceramic membranes 2, mainly to improve the cleaning cleanliness between the membranes, ensure the best cleaning effect, and at the same time ensure that the scrubbing particles can flow between the perforated air washing pipe 13 and the ceramic membrane, improving the scrubbing effect.

[0038] The internal channel of the plate-type ceramic membrane 2 has an inverted wedge-shaped structure, which improves the separation speed through the inverted wedge shape and accelerates the flow of the clarified water after filtration.

[0039] Sewage and scrubbing particles 26 are placed in the reaction membrane tank 1. The scrubbing particles 26 are solid resin particles. The scrubbing particles 26 are spherical particles. Erasing protrusions are arranged on the periphery of the spherical particles. The erasing protrusions 27 are in the shape of a trapezoidal cylinder. The erasing protrusions 27 are evenly arranged on the scrubbing particles 26. The spherical particles are provided to clean the ceramic membrane during rotation by the agitation of the air flow. The scrubbing protrusions are also provided to better improve the scrubbing effect, achieving the technical purpose of rotating and scraping the ceramic membrane, and improving the one-time contact of scraping and the efficient scrubbing of cleanliness.

[0040] A method for using a three-phase composite cleaning membrane treatment device includes the following steps:

[0041] S1: Sewage enters the reaction membrane tank 1 through the water inlet 28. An internal negative pressure is formed through the internal suction of the plate-type ceramic membrane 2 to separate the sewage. The particulate pollutants are isolated outside the plate-type ceramic membrane 2, and the clarified water flows into the membrane pore channels. The internal flow channel is in an inverted wedge shape to facilitate the upward convergence of the clarified water into the water production branch pipe 3 at the top of the membrane, and finally converges into the negative pressure main pipe 4 and is sucked out by the suction pump, achieving the purpose of separating sewage.

[0042] S2: During the suction separation process, the adhesions on the surface of the plate-type ceramic membrane 2 gradually increase, and the separation effect deteriorates. At this time, the three-phase composite cleaning process of water, gas, and scrubbing particles is used for peeling. By regularly closing the water production suction pump to stop water absorption, instead, clear water is introduced into the water branch pipe 3 from the negative pressure main pipe 4 to form a hydraulic backwash on the surface of the plate-type ceramic membrane 2, and the flushing direction is perpendicular to the plate-type ceramic membrane 2. During this process, the perforated air washing pipe 13 at the bottom of the reaction membrane tank 1 is aerated, and the gas flows from the inner pipe 19 to the outer pipe. During the flow process, due to the front baffle 22 and the rear baffle 23 being provided on the outer pipe 20, the gas flows to the other two sides and is ejected outward through the ejection holes of the outer pipe 20, and the ejection direction is aimed at the surface of the plate-type ceramic membrane 2 on both sides of the perforated air washing pipe 13. At this time, the water contains a large number of resin spherical particles, and the surface of the plate-type ceramic membrane 2 is scrubbed through the erasing protrusions provided on the surface of the resin spherical particles, achieving the purpose of cleaning.

[0043] S3: During this process, the large and medium-sized pore bubbles formed by the gas drive the resin spherical particles to float upward to scrub the surface of the membrane, and the scrubbing direction is parallel to the plate surface. At the same time, the aeration intensity is adjusted according to the degree of pollution of the plate-type ceramic membrane 2 to achieve the cleanliness of scrubbing.

[0044] S4: During the operation of the traditional ceramic membrane solid-liquid separation process, when the plate-type ceramic membrane sheet 2 performs filtration separation, in order to ensure the concentration and activity of the scrubbing particles 26 in the reaction membrane tank 1 during the cleaning process, the scrubbing particles 26 are recovered, separated and reused through the sewage return device. The scrubbing particles 26 are put into the reaction membrane tank 1 again through the separator 10. At the same time, during this process, due to the different contaminated parts of the plate-type ceramic membrane sheet 2, according to the degree of contamination at different positions, the separated scrubbing particles 26 are sent to the position of the plate-type ceramic membrane sheet 2 with a greater degree of contamination through the sliding device 6 arranged on one side of the sewage return device, and the cleaning speed of the plate-type ceramic membrane sheet 2 is accelerated by increasing the concentration of the scrubbing particles 26, thus completing the cleaning work of the plate-type ceramic membrane sheet 2.

[0045] The adhesives on the membrane surface are peeled off through the three-phase composite cleaning process of water, gas and scrubbing particles. The water production suction pump is regularly closed to stop water production, and instead, clean water is flushed into the membrane from the water production pipe to form a hydraulic backwash to flush the membrane surface. The flushing direction is perpendicular to the membrane plate; a perforated air washing pipe is arranged at the bottom of the membrane tank for aeration, and large and medium-sized air bubbles float upward to scrub the surface of the membrane. The scrubbing direction is parallel to the plate surface; heavy-duty wear-resistant scrubbing particles are put into the membrane tank. Driven by the air washing bubbles, the particles are lifted and presented in an expanded state. By adjusting the aeration intensity, the expansion height of the expanded bed can be adjusted. In the actual cases of the operation of the traditional ceramic membrane process, the probability of membrane pollution occurring in the lower part is higher than that in the upper part. Therefore, according to the actual situation of the project, maintaining a low expansion rate of the scrubbing particles can clean the key parts of the membrane pollution while saving energy. When full membrane scrubbing is required, the strongest aeration intensity is turned on to make the particles fully fluidized and scrubbed. Through the intermittent operation mode of low-intensity expansion and high-intensity fluidization, a breathing bed of scrubbing particles is formed for periodic scrubbing.

[0046] Different from the traditional vertically rectangular cross-section membrane sheet, the membrane sheet of the present invention is in an inverted wedge shape. This reduces the adhesion force of the membrane sheet adhesives in the vertical direction, which is beneficial to desorption. And the scrubbing particles moving vertically upward with the air flow are also more likely to hit the membrane surface and achieve a good scrubbing effect.

[0047] Since the particulate matter in the sewage usually has a relatively low specific gravity, which is lighter than the heavy-duty scrubbing particles used in the present invention. Therefore, median suction can be used for sludge discharge operation. The sludge discharge pump transports the slurry mixture to the particle separator, and the scrubbing particles therein are returned to the membrane tank, while the slurry is discharged for disposal or returned to the biochemical tank.

[0048] During actual operation, the concentration of the scrubbing particles can be locally adjusted according to actual needs. The scrubbing particles at the bottom of the membrane tank are sucked and returned through the low-position suction port at the bottom of the membrane tank. By moving the particle separator along the track, the position of particle return can be controlled and it flows to the membrane sheet with particularly serious membrane pollution, so that the local concentration of the scrubbing particles in the membrane tank is effectively changed, strengthening the cleaning effect.

[0049] When the membrane tank stops operating, the particles will settle to the bottom. Therefore, an anti-blocking cap is provided at the top of each perforation of the air washing pipe and supported by a support bar to prevent the particles from falling into the air holes of the air washing pipe. At the same time, the sludge discharge pump can be started to suck and scrub the particles, and the scrubbed particles are recycled to the corresponding storage tank and added to the membrane tank again when the next operation is carried out.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art of this technology, without departing from the technical principle of the present invention, several improvements and substitutions can still be made, and these improvements and substitutions are all regarded as within the protection scope of the present invention.

Claims

1. A three-phase composite cleaning membrane treatment device, including a reaction membrane tank, characterized in that, A plurality of plate - type ceramic membranes are arranged in the reaction membrane tank. A sewage inlet is arranged at the upper end of one side of the reaction membrane tank. The plurality of plate - type ceramic membranes are respectively installed in parallel in the reaction membrane tank. The upper - end interfaces of the plate - type ceramic membranes are installed with water branch pipes. A negative - pressure main pipe is arranged at the upper end of the water branch pipes. The water branch pipes are connected to the negative - pressure main pipe. The water branch pipes are installed at the upper end of the reaction membrane tank through brackets. A sewage discharge and reflux device is installed at the upper end of the brackets. The sewage discharge and reflux device includes a particle separation mechanism and a sludge discharge mechanism. The particle separation mechanism includes a separation pipe and a separator. The separator is connected to the separation pipe. The sewage discharge and reflux device is movably connected to a suction main pipe. The sewage discharge and reflux device is installed on a sliding device at the upper end of the brackets. The sliding device is installed on supporting plates at both ends of the reaction membrane tank. The supporting plates are fixedly connected to the reaction membrane tank. A sliding device is fixedly connected to the upper end of the supporting plates. A plurality of perforated air - washing pipes are arranged at the bottom of the reaction membrane tank. The perforated air - washing pipes are intermittently arranged with the plate - type ceramic membranes; The sliding device includes a lower slide rail and an upper slider. The lower slide rail is slidably connected to the upper slider. The upper end of the upper slider is connected to the sewage discharge and reflux device. A moving motor is arranged on one side of the upper slider. The moving motor is connected to the upper slider through a rotating shaft; The lower end of the separator is installed with a separation pipe. The separation pipe is fixedly installed on one side of the sliding device. The separation pipe extends into the upper end of the plate - type ceramic membranes in the reaction membrane tank. The separation pipe is perpendicular to the negative - pressure main pipe; The perforated air - washing pipe includes an inner pipe and an outer pipe. The inner pipe is embedded in the outer pipe. The inner pipe includes an upper closed circular plate, a front baffle, and a rear baffle. Connecting circular sleeves are installed at the lower ends of the front baffle and the rear baffle. The front baffle and the rear baffle are embedded in the outer pipe. The lower end of the outer pipe is connected to the connecting circular sleeve. The upper closed circular plate is fixedly connected to the upper end of the outer pipe; Sewage and scrubbing particles are placed in the reaction membrane tank. The scrubbing particles are resin solid particles. The scrubbing particles are spherical particles. Erasing protrusions are arranged on the periphery of the spherical particles. The erasing protrusions are trapezoidal cylinder shapes. The erasing protrusions are evenly arranged on the scrubbing particles.

2. The three-phase composite cleaning membrane treatment device according to claim 1, characterized in that, Spray holes are arranged on the left and right outer walls of the outer pipe. The spray holes are arranged between the front baffle and the rear baffle. The spray holes are arranged on the outer wall of the outer pipe in a clockwise tangential inclination; 3. The three-phase composite cleaning membrane treatment device according to claim 2, characterized in that, The perforated air - washing pipes are arranged in the gaps between the plurality of plate - type ceramic membranes. The height of the perforated air - washing pipes in the membrane tank is less than the height of the plate - type ceramic membranes.

4. The three-phase composite cleaning membrane treatment device according to claim 1, characterized in that, The internal channel of the plate - type ceramic membrane is an inverted - wedge - shaped structure.

5. A usage method of a three-phase composite cleaning membrane treatment device, characterized in that, The three - phase composite cleaning membrane treatment device is a three - phase composite cleaning membrane treatment device according to any one of claims 1 to 4, and includes the following steps: S1: Sewage enters the reaction membrane pool through the inlet. An internal negative pressure is formed by suction inside the plate-type ceramic membrane, separating the sewage. The particulate pollutants are isolated outside the plate-type ceramic membrane, and the clear water flows into the pore channels of the membrane. The internal flow channel is in an inverted wedge shape to facilitate the upward collection of the clear water into the water production branch pipe at the top of the membrane, and finally converges into the negative pressure main pipe and is pumped out by the suction pump to achieve the purpose of sewage separation. S2: During the suction separation process, the adhesions on the surface of the plate-type ceramic membrane gradually increase, and the separation effect deteriorates. At this time, it is peeled off through a three-phase composite cleaning process of water, gas, and scrubbing particles. By regularly closing the water production suction pump to stop water absorption, instead, clear water is introduced into the water branch pipe from the negative pressure main pipe to form a hydraulic backwash on the surface of the plate-type ceramic membrane, and the washing direction is perpendicular to the plate-type ceramic membrane. During this process, perforated air washing pipes are arranged at the bottom of the reaction membrane pool for aeration. The gas flows from the inner pipe to the outer pipe. During the flow process, due to the front baffle and rear baffle set on the outer pipe, the gas flows to the other two sides and is ejected outward through the ejection holes of the outer pipe, and the ejection direction is aimed at the surface of the plate-type ceramic membrane on both sides of the perforated air washing pipe. At this time, the water contains a large number of resin spherical particles, and the surface of the plate-type ceramic membrane is scrubbed through the erasing protrusions set on the surface of the resin spherical particles to achieve the purpose of cleaning. S3: During this process, the large and medium-sized pore bubbles formed by the gas drive the resin spherical particles to float upward to scrub the surface of the membrane. The scrubbing direction is parallel to the plate surface. At the same time, the aeration intensity is adjusted according to the degree of pollution of the plate-type ceramic membrane to achieve the cleanliness of scrubbing. S4: During the operation of the traditional ceramic membrane solid-liquid separation process, when the plate-type ceramic membrane is performing filtration separation, in order to ensure the concentration and activity of the scrubbing particles in the reaction membrane pool during the cleaning process, the scrubbing particles are recycled and separated for reuse through the sewage return device. The scrubbing particles are put into the reaction membrane pool again through the separator. At the same time, during this process, due to the different contaminated parts of the plate-type ceramic membrane, according to the degree of pollution at different positions, the separated scrubbing particles are sent to the position of the plate-type ceramic membrane with a greater degree of pollution through the sliding device set on one side of the sewage return device, and the cleaning speed of the plate-type ceramic membrane is accelerated by increasing the concentration of the scrubbing particles to complete the cleaning work of the plate-type ceramic membrane.

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