Coal mine production circulating water filtering device and use method thereof

Abstract

The invention relates to the technical field of filtering devices, in particular to a coal mine production circulating water filtering device which comprises a settling pond, a biological filtering pond and a membrane filtering pond. A first water pump, a first water pipe, a second water pipe, a second water pump, a third water pipe and a fourth water pipe are further included; according to the invention, a biological filter and a membrane separation technology are combined, aerobic microorganisms are used for carrying out biological oxidation treatment on organic matters in sewage, the sewage is in clearance contact with a microbial membrane growing on the surface of a filler, so that the sewage is purified, and the microorganisms form a high-activity biological membrane on the surface of a filter material; organic matters, nitrides and suspended particles in sewage are removed through adsorption and degradation, the membrane has extremely high separation efficiency, pollutants and impurities can be effectively separated out, the separation efficiency is improved, membrane pollution is reduced, meanwhile, energy consumption is reduced, the membrane cleaning effect is improved, the cleaning time is shortened, and the service life of the membrane is prolonged. Membrane blockage is avoided, and smoothness of water flow is kept.

Description

Technical Field

[0001] The invention relates to the technical field of filtering devices, and in particular to a filtering device for circulating water in coal mine production and a use method thereof. Background Art

[0002] In the process of coal mining production, circulating water is generated, which contains a large amount of suspended matter, impurities and organic matter. If it is discharged directly, it will cause serious pollution to the environment. Therefore, the circulating water needs to be treated to meet environmental protection requirements. Traditional treatment methods mainly include sedimentation and filtration. The sedimentation method is to remove the suspended matter in the circulating water by gravity sedimentation. During the treatment process, flocculants need to be added to make the suspended matter condense into larger particles, which are easy to separate and precipitate. However, this method is not effective for biological pollution and organic pollution. The filtration method is to remove impurities in the circulating water through a filter. This method can effectively remove suspended matter, particulate matter and microorganisms, but it is not effective for the removal of organic matter.

[0003] In addition to traditional treatment methods, there are also membrane separation and biological methods. Membrane separation is a method that uses the special properties of membranes to separate and purify circulating water. It can effectively remove trace suspended matter, organic matter and inorganic salts. The biological method uses the metabolic activity of microorganisms to remove organic matter and nutrients such as nitrogen and phosphorus in circulating water. It can purify circulating water to water quality standards that can be directly reused. However, the existing membrane separation method has the problem that the membrane is easily clogged and difficult to clean, which increases maintenance costs, while the biological filtration has the problem of incomplete treatment effect.

[0004] Therefore, in view of the problems of the above-mentioned membrane separation method, such as the membrane is easily clogged and difficult to clean, which increases the maintenance cost, and the problem of incomplete treatment effect in biological filtration, a coal mine production circulating water filtration device and its use method can be designed. Summary of the invention

[0005] In order to overcome the problem of membrane separation method that the membrane is easy to clog and difficult to clean, which increases the maintenance cost, and the problem of biological filtration that the treatment effect is not comprehensive.

[0006] The technical scheme of the present invention is: a circulating water filtration device for coal mine production, comprising a sedimentation tank, a biological filtration tank and a membrane filtration tank; further comprising a first water pump, a first water pipe, a second water pipe, a second water pump, a third water pipe and a fourth water pipe; The sedimentation tank includes a bottom plate; support columns are fixedly connected at the four corners of the upper end of the bottom plate; a sedimentation box is fixedly connected to the upper end of the support column; a sedimentation sludge bucket distributed at equal intervals is fixedly connected to the lower end of the sedimentation box; a wing plate distributed at equal intervals in the transverse direction is fixedly connected inside the sedimentation box; a limited slide plate is fixedly connected to the right side of the upper end of the sedimentation box; a runway-shaped internal gear is slidably connected inside the limited slide plate; a driving gear meshing with the runway-shaped internal gear is rotatably connected inside the limited slide plate; a connecting block is fixedly connected to the right end of the runway-shaped internal gear; a silo is fixedly connected to the right end of the connecting block; a circular aeration pipe is installed at the upper end of the bottom right side of the sedimentation box; The biological filtration pool includes a filter box; a grille is fixedly connected to the lower side of the filter box; a supporting layer and filter material are arranged in sequence on the upper side of the grille; and a water distributor is installed on the upper side of the filter box; The membrane filtration tank includes an outer box body; a first diaphragm and a second diaphragm are installed in the outer box body from left to right in sequence; an outlet pipe is installed on the upper side of the left end of the outer box body; a filtered water discharge pipe connected to the first diaphragm and the second diaphragm is installed at the lower end of the outlet pipe; fixed plates are fixedly connected to the upper and lower sides of the left inner wall of the outer box body; a ball screw is rotatably connected between the two fixed plates; a screw pair that moves vertically is installed on the outer side of the ball screw; a lifting aeration pipe is fixedly connected to the right end of the screw pair.

[0007] Preferably, a compressed gas inlet pipe connected to the circular aeration pipe is installed at the lower right end of the sedimentation box; and a water inlet pipe extending into the sedimentation box is installed at the upper right end of the sedimentation box.

[0008] Preferably, a drain valve is fixedly connected to the lower end of the sedimentation sludge hopper; a sludge discharge pipe is fixedly connected to the lower end of the drain valve; and a first motor connected to the driving gear is fixedly connected to the left end of the limiting slide plate.

[0009] Preferably, a first water pump is fixedly connected to the right end of the filter box; a first water pipe connected to the upper water outlet on the left end of the sedimentation box is installed at the inlet end of the first water pump; and a second water pipe connected to the water distributor is installed at the outlet end of the first water pump.

[0010] Preferably, the supporting layer is any one or more combinations of natural gravel, natural pebbles, heavy ore and palm fiber; the filter material is any one or more combinations of quartz sand, anthracite, marble, garnet, dolomite, polystyrene foam plastic and fiber balls.

[0011] Preferably, the lower ends of the first diaphragm and the second diaphragm are fixedly connected to a fixing seat which is symmetrically distributed front to back and connected to the upper end of the bottom of the outer box body; the inner wall on the right side of the outer box body is fixedly connected to a vertical guide rail which is symmetrically distributed front to back; a guide slider connected to the lifting aeration pipe is slidably connected in the vertical guide rail; a second motor connected to the ball screw is installed on the upper end of the fixed plate.

[0012] Preferably, a second water pump is fixedly connected to the right end of the outer box; a third water pipe connected to the water outlet of the filter box is installed at the inlet end of the second water pump; and a fourth water pipe extending into the outer box is installed at the outlet end of the second water pump.

[0013] A method for using a coal mine production circulating water filter device, comprising the coal mine production circulating water filter device as described in any one of the above, and the steps are as follows: Step 1: Add water treatment agent into the silo, start the first motor, drive the drive gear selection, the drive gear intermittently meshes with the teeth on the upper and lower sides of the runway-type internal gear, the runway-type internal gear moves back and forth in the limit slide plate, the connecting block drives the silo to move back and forth, and the water treatment agent is evenly sprinkled in the sedimentation box. Compressed air is sent into the compressed gas inlet pipe, and the compressed air is evenly sent into the sedimentation box through the circular aeration pipe. The circulating water enters the right side of the sedimentation box through the water inlet pipe. The compressed air and water are in strong contact, dissolving the oxygen in the air into the water, or expelling the unnecessary gas and volatile substances in the water into the air. The water treatment agent reacts with the circulating water to further accelerate the treatment effect. As the circulating water increases, the circulating water passes through the wing plate in turn. Under the action of gravity, the sludge is settled in the sedimentation sludge bucket. Finally, the drain valve is opened to discharge the sludge through the sludge discharge pipe. Turn on the first water pump to supply the treated water in the sedimentation box to the water distributor through the first water pipe and the second water pipe; Step 2: The water distributor evenly sprays water on the supporting layer and filter material in the filter box. The water contacts the gaps between the microorganism membranes growing on the surface of the filter material, purifying the sewage. The purified water falls into the bottom of the filter box through the grille. The second water pump is turned on to send the treated water into the outer box through the third and fourth water pipes. Step 3: Compressed air is introduced into the lifting aeration pipe, and the sewage in the outer box is filtered by the first diaphragm and the second diaphragm, and then discharged through the outlet pipe and the filtered water discharge pipe; Step 4: When cleaning is required, stop the entire device, feed clean water into the outer box, start the second motor, drive the ball screw between the fixed plates, and the screw pair converts the rotary motion of the ball screw into linear motion, driving the fixed seat and the lifting aeration pipe to move up and down. The guide slider at the right end of the lifting aeration pipe slides up and down in the vertical guide track. Aerate for 24 hours to flush impurities on the first diaphragm and the second diaphragm.

[0014] The beneficial effects of the present invention are as follows: the biological filter and membrane separation technology are combined, and aerobic microorganisms are used to carry out biological oxidation treatment on organic matter in sewage. The sewage contacts the gap between the microbial membranes grown on the surface of the filler, so that the sewage is purified. The microorganisms form a highly active biofilm on the surface of the filter material, and remove organic matter, nitrides and suspended particles in the sewage through adsorption and degradation. The membrane has an extremely high separation efficiency and can effectively separate pollutants and impurities. While ensuring the water treatment effect, the separation efficiency is improved, and membrane pollution is reduced. At the same time, energy consumption is reduced, it is more environmentally friendly, and the operating cost is reduced. The lifting aeration pipe adopts a liftable design. When the membrane is cleaned, the cleaning effect of the membrane is improved, the cleaning time is shortened, the membrane is prevented from being blocked, and the water flow is kept unobstructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a first three-dimensional structural schematic diagram of a coal mine production circulating water filtering device of the present invention; Figure 2 Shown is a second three-dimensional structural schematic diagram of the coal mine production circulating water filtering device of the present invention; Figure 3 Shown is a schematic diagram of the cross-sectional three-dimensional structure of a sedimentation tank in a circulating water filtration device for coal mine production according to the present invention; Figure 4 Shown is a schematic diagram of the three-dimensional structure of the limiting slide plate and the raceway-type internal gear in the circulating water filtration device for coal mine production of the present invention; Figure 5 Shown is a schematic diagram of a three-dimensional structure of a cross-section of a biological filtration pool in a circulating water filtration device for coal mine production according to the present invention; Figure 6 Shown is a schematic diagram of the three-dimensional structure of the membrane filter tank in the coal mine production circulating water filtration device of the present invention.

[0016] Description of reference numerals: Sedimentation tank: 101, bottom plate; 102, support column; 103, sedimentation box; 104, sedimentation sludge bucket; 105, wing plate; 106, limit slide plate; 107, runway-type internal gear; 108, driving gear; 109, connecting block; 110, silo; 111, circular aeration pipe; 112, compressed gas inlet pipe; 113, water inlet pipe; 114, sewage valve; 115, sludge discharge pipe; 116, first motor; Biological filtration pool: 201, filter box; 202, grille; 203, support layer; 204, filter material; 205, water distributor; Membrane filtration tank: 301, outer box; 302, first diaphragm; 303, second diaphragm; 304, water outlet pipe; 305, filtered water discharge pipe; 306, fixing plate; 307, ball screw; 308, screw pair; 309, lifting aeration pipe; 310, fixing seat; 311, vertical guide rail; 312, guide slider; 313, second motor; 4. First water pump; 5. First water pipe; 6. Second water pipe; 7. Second water pump; 8. Third water pipe; 9. Fourth water pipe. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] See also Figure 1-Figure 6 The present invention provides an embodiment: a circulating water filtration device for coal mine production, including a sedimentation tank, a biological filtration tank and a membrane filtration tank; also including a first water pump 4, a first water pipe 5, a second water pipe 6, a second water pump 7, a third water pipe 8 and a fourth water pipe 9; The sedimentation tank includes a bottom plate 101; support columns 102 are fixedly connected at the four corners of the upper end of the bottom plate 101; a sedimentation box 103 is fixedly connected to the upper end of the support column 102; a sedimentation sludge bucket 104 distributed at equal intervals is fixedly connected to the lower end of the sedimentation box 103; a wing plate 105 distributed at equal intervals in the transverse direction is fixedly connected inside the sedimentation box 103; a limited slide plate 106 is fixedly connected to the right side of the upper end of the sedimentation box 103; a runway-type internal gear 107 is slidably connected in the limited slide plate 106; a driving gear 108 meshing with the runway-type internal gear 107 is rotatably connected in the limited slide plate 106; a connecting block 109 is fixedly connected to the right end of the runway-type internal gear 107; a silo 110 is fixedly connected to the right end of the connecting block 109; a circular aeration pipe 111 is installed at the upper end of the bottom right side of the sedimentation box 103; The biological filtration pool includes a filter box 201; a grille 202 is fixedly connected to the lower side of the filter box 201; a supporting layer 203 and filter material 204 are arranged in sequence on the upper side of the grille 202; a water distributor 205 is installed on the upper side of the filter box 201; The membrane filtration tank includes an outer box body 301; a first diaphragm 302 and a second diaphragm 303 are installed in the outer box body 301 from left to right; a water outlet pipe 304 is installed on the upper side of the left end of the outer box body 301; a filtered water discharge pipe 305 connected to the first diaphragm 302 and the second diaphragm 303 is installed at the lower end of the water outlet pipe 304; fixed plates 306 are fixedly connected to the upper and lower sides of the left inner wall of the outer box body 301; a ball screw 307 is rotatably connected between the two fixed plates 306; a screw pair 308 that moves vertically is installed on the outer side of the ball screw 307; a lifting aeration pipe 309 is fixedly connected to the right end of the screw pair 308.

[0019] See also Figure 1-Figure 4In this embodiment, a compressed gas inlet pipe 112 connected to a circular aeration pipe 111 is installed at the lower right end of the sedimentation box 103; a water inlet pipe 113 extending into the sedimentation box 103 is installed at the upper right end of the sedimentation box 103; a sewage valve 114 is fixedly connected to the lower end of the sedimentation sludge hopper 104; a sludge discharge pipe 115 is fixedly connected to the lower end of the sewage valve 114; a first motor 116 connected to a driving gear 108 is fixedly connected to the left end of the limiting slide plate 106; a first water pump 4 is fixedly connected to the right end of the filter box 201; a first water pipe 5 connected to the water outlet on the upper left end of the sedimentation box 103 is installed at the inlet end of the first water pump 4; a second water pipe 6 connected to a water distributor 205 is installed at the outlet end of the first water pump 4.

[0020] See also Figure 1 and Figure 5-Figure 6 In this embodiment, the supporting layer 203 is a combination of any one or more of natural gravel, natural pebbles, heavy ore and palm fiber; the filter material 204 is a combination of any one or more of quartz sand, anthracite, marble, garnet, dolomite, polystyrene foam plastic and fiber balls; the lower ends of the first diaphragm 302 and the second diaphragm 303 are fixedly connected with a fixing seat 310 that is symmetrically distributed front and back and connected to the upper end of the bottom of the outer box 301; the right inner wall of the outer box 301 is fixedly connected with a vertical guide track 311 that is symmetrically distributed front and back; the vertical guide track 311 is slidably connected with a guide slider 312 connected to the lifting aeration pipe 309; the upper end of the fixing plate 306 is installed with a second motor 313 connected to the ball screw 307; the right end of the outer box 301 is fixedly connected with a second water pump 7; the inlet end of the second water pump 7 is installed with a third water pipe 8 connected to the water outlet of the filter box 201; the outlet end of the second water pump 7 is installed with a fourth water pipe 9 extending into the outer box 301.

[0021] A method for using a coal mine production circulating water filter device, comprising the coal mine production circulating water filter device as described in any one of the above, and the steps are as follows: Step 1: Add water treatment agent into the silo 110, start the first motor 116, drive the drive gear 108 to select, the drive gear 108 intermittently meshes with the teeth on the upper and lower sides of the runway-shaped internal gear 107, the runway-shaped internal gear 107 moves back and forth in the limit slide plate 106, the connecting block 109 drives the silo 110 to reciprocate back and forth, and the water treatment agent is evenly sprinkled in the sedimentation box 103, and compressed air is sent into the compressed gas inlet pipe 112. The compressed air is evenly sent into the sedimentation box 103 through the circular aeration pipe 111, and the circulating water enters the sedimentation box through the water inlet pipe 113. On the right side of the box 103, the compressed air comes into strong contact with the water, dissolving the oxygen in the air into the water, or expelling the unnecessary gas and volatile substances in the water into the air. The water treatment agent reacts with the circulating water, further accelerating the treatment effect. As the circulating water increases, the circulating water passes through the wing plate 105 in turn. Under the action of gravity, the sludge settles in the sedimentation sludge hopper 104. Finally, the drain valve 114 is opened to discharge the sludge through the sludge discharge pipe 115. The first water pump 4 is turned on to supply the treated water in the sedimentation box 103 to the water distributor 205 through the first water pipe 5 and the second water pipe 6. Step 2: The water distributor 205 evenly sprays water on the supporting layer 203 and the filter material 204 in the filter box 201, and the water contacts the gap between the microorganisms growing on the surface of the filter material 204, so that the sewage is purified. The purified water falls into the bottom of the filter box 201 through the grille 202, and the second water pump 7 is turned on to send the treated water into the outer box 301 through the third water pipe 8 and the fourth water pipe 9; Step 3: Compressed air is introduced into the lifting aeration pipe 309, and the sewage in the outer box 301 is filtered by the first membrane 302 and the second membrane 303, and then discharged through the outlet pipe 304 and the filtered water discharge pipe 305; Step 4: When cleaning is required, the entire device is shut down, clean water is fed into the outer box 301, and the second motor 313 is started to drive the ball screw 307 between the fixed plates 306. The screw pair 308 converts the rotary motion of the ball screw 307 into linear motion, driving the fixed seat 310 and the lifting aeration pipe 309 to move up and down. The guide slider 312 at the right end of the lifting aeration pipe 309 slides up and down in the vertical guide track 311. Aeration is carried out for 24 hours to flush impurities on the first diaphragm 302 and the second diaphragm 303.

[0022] Through the above steps, the biological filter and membrane separation technology are combined, and aerobic microorganisms are used to carry out biological oxidation treatment on organic matter in sewage. The sewage contacts the gap between the microbial membranes grown on the surface of the filler, so that the sewage is purified. The microorganisms form a highly active biofilm on the surface of the filler, and remove organic matter, nitrogen compounds and suspended particles in the sewage through adsorption and degradation. The membrane separation method has an extremely high separation efficiency, which can effectively separate pollutants and impurities. Under the condition of ensuring the water treatment effect, the separation efficiency is improved, and membrane pollution is reduced. At the same time, energy consumption is reduced, which is more environmentally friendly and reduces the operating cost. The cleaning effect of the membrane is improved, the cleaning time is shortened, the membrane is prevented from being blocked, and the water flow is kept unobstructed to solve the problems of easy clogging and difficult cleaning of the membrane separation method, which increases the maintenance cost, and the problem of incomplete treatment effect of biological filtration.

[0023] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A circulating water filtration device for coal mine production, including a sedimentation tank, a biological filtration tank and a membrane filtration tank; characterized in that: It also includes a first water pump (4), a first water pipe (5), a second water pipe (6), a second water pump (7), a third water pipe (8) and a fourth water pipe (9); The sedimentation tank comprises a bottom plate (101); support columns (102) are fixedly connected at the four corners of the upper end of the bottom plate (101); a sedimentation box (103) is fixedly connected at the upper end of the support column (102); the sedimentation box (103) is fixedly connected with equidistantly distributed sedimentation sludge buckets (104); the sedimentation box (103) is fixedly connected with wing plates (105) distributed equidistantly in the transverse direction inside; the upper right side of the sedimentation box (103) is fixedly connected with a limited position slide plate (106); 06); a racetrack-shaped internal gear (107) is slidably connected in the limiting chute plate (106); a driving gear (108) meshingly connected with the racetrack-shaped internal gear (107) is rotatably connected in the limiting chute plate (106); a connecting block (109) is fixedly connected to the right end of the racetrack-shaped internal gear (107); a silo (110) is fixedly connected to the right end of the connecting block (109); a circular aeration pipe (111) is installed at the upper end of the bottom right side of the sedimentation box (103); The biological filtration pool comprises a filtration box (201); a grille (202) is fixedly connected to the lower inner side of the filtration box (201); a supporting layer (203) and filter material (204) are sequentially arranged on the upper side of the grille (202); and a water distributor (205) is installed on the upper inner side of the filtration box (201); The membrane filtration tank comprises an outer box (301); a first diaphragm (302) and a second diaphragm (303) are sequentially installed in the outer box (301) from left to right; a water outlet pipe (304) is installed on the upper side of the left end of the outer box (301); a filtered water discharge pipe (305) connected to the first diaphragm (302) and the second diaphragm (303) is installed at the lower end of the water outlet pipe (304); fixed plates (306) are fixedly connected to the upper and lower sides of the left inner wall of the outer box (301); a ball screw (307) is rotatably connected between the two fixed plates (306); a screw pair (308) that moves vertically is installed on the outer side of the ball screw (307); and a lifting aeration pipe (309) is fixedly connected to the right end of the screw pair (308).

2. The coal mine production circulating water filtering device according to claim 1 is characterized in that: A compressed gas inlet pipe (112) connected to the circular aeration pipe (111) is installed at the lower right end of the sedimentation box (103); and a water inlet pipe (113) extending into the sedimentation box (103) is installed at the upper right end of the sedimentation box (103).

3. The coal mine production circulating water filtering device according to claim 2 is characterized in that: The lower end of the sedimentation sludge bucket (104) is fixedly connected to a sewage discharge valve (114); the lower end of the sewage discharge valve (114) is fixedly connected to a sludge discharge pipe (115); and the left end of the limiting slide plate (106) is fixedly connected to a first motor (116) connected to the driving gear (108).

4. The coal mine production circulating water filtering device according to claim 3 is characterized in that: The right end of the filter box (201) is fixedly connected to a first water pump (4); the inlet end of the first water pump (4) is equipped with a first water pipe (5) connected to the upper water outlet at the left end of the sedimentation box (103); and the outlet end of the first water pump (4) is equipped with a second water pipe (6) connected to the water distributor (205).

5. The coal mine production circulating water filtering device according to claim 4 is characterized in that: The supporting layer (203) is any one or more combinations of natural gravel, natural pebbles, heavy minerals and palm fibers; the filter material (204) is any one or more combinations of quartz sand, anthracite, marble, garnet, dolomite, polystyrene foam plastics and fiber balls.

6. The coal mine production circulating water filtering device according to claim 5, characterized in that: The lower ends of the first diaphragm (302) and the second diaphragm (303) are fixedly connected to a fixing seat (310) which is symmetrically distributed frontward and rearward and connected to the upper end of the bottom of the outer box (301); the right inner wall of the outer box (301) is fixedly connected to a vertical guide track (311) which is symmetrically distributed frontward and rearward; a guide slider (312) connected to the lifting aeration pipe (309) is slidably connected inside the vertical guide track (311); and a second motor (313) connected to the ball screw (307) is installed on the upper end of the fixing plate (306).

7. The coal mine production circulating water filtering device according to claim 6 is characterized in that: The right end of the outer box (301) is fixedly connected to a second water pump (7); the inlet end of the second water pump (7) is installed with a third water pipe (8) connected to the water outlet of the filter box (201); the outlet end of the second water pump (7) is installed with a fourth water pipe (9) extending into the outer box (301).

8. The method for using the circulating water filtration device in coal mine production is characterized in that It comprises a coal mine production circulating water filtering device according to any one of claims 1 to 7, and the steps are as follows: Step 1: Add water treatment agent into the silo (110), start the first motor (116), drive the drive gear (108) to select, the drive gear (108) intermittently meshes with the teeth on the upper and lower sides of the racetrack-shaped internal gear (107), the racetrack-shaped internal gear (107) moves back and forth in the limit slide plate (106), the connecting block (109) drives the silo (110) to make a back and forth reciprocating motion, and the water treatment agent is evenly sprinkled in the sedimentation box (103), and compressed air is sent into the compressed air inlet pipe (112). The compressed air is evenly sent into the sedimentation box (103) through the circular aeration pipe (111), and the circulating water passes through the water inlet pipe (113) Entering the right side of the sedimentation box (103), the compressed air comes into strong contact with the water, dissolving the oxygen in the air into the water, or releasing the unnecessary gases and volatile substances in the water into the air. The water treatment agent reacts with the circulating water, further accelerating the treatment effect. As the circulating water increases, the circulating water passes through the wing plates (105) in turn. Under the action of gravity, the sludge is settled in the sedimentation sludge bucket (104). Finally, the sewage valve (114) is opened to discharge the sludge through the sludge discharge pipe (115). The first water pump (4) is turned on to supply the treated water in the sedimentation box (103) to the water distributor (205) through the first water pipe (5) and the second water pipe (6); Step 2: The water distributor (205) evenly sprays water onto the supporting layer (203) and the filter material (204) in the filter box (201), and the water contacts the gaps between the microbial membranes growing on the surface of the filter material (204), thereby purifying the sewage. The purified water falls into the bottom of the filter box (201) through the grille (202), and the second water pump (7) is turned on to deliver the treated water into the outer box (301) through the third water pipe (8) and the fourth water pipe (9); Step 3: Compressed air is introduced into the lifting aeration pipe (309), and the sewage in the outer box (301) is filtered by the first membrane (302) and the second membrane (303), and then discharged through the outlet pipe (304) and the filtered water discharge pipe (305); Step 4: When cleaning is required, the entire device is stopped, clean water is introduced into the outer box (301), and the second motor (313) is started to drive the ball screw (307) between the fixed plates (306). The screw pair (308) converts the rotary motion of the ball screw (307) into linear motion, driving the fixed seat (310) and the lifting aeration pipe (309) to move up and down. The guide slider (312) at the right end of the lifting aeration pipe (309) slides up and down in the vertical guide track (311). Aeration is performed for 24 hours to flush impurities on the first diaphragm (302) and the second diaphragm (303).

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