Multi-stage sewage treatment device

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a multi-stage sewage treatment device which comprises a sewage pipe, a first filtering assembly is arranged on one side of the sewage pipe, and a second filtering assembly is arranged on one side of the sewage pipe; the first filtering assembly comprises a filtering pipe, the filtering pipe is connected with a flange, the flange is connected with a flange cover through a bolt, the flange cover is connected with a discharging port, and a filtering basket is arranged in the filtering pipe; the second filtering assembly comprises a filtering box, a rotating column is arranged in the filtering box, the rotating column is connected with a connecting rod through a lantern ring, the connecting rod is connected with a filtering barrel, the filtering box is connected with a water tank, a water pump is arranged at the top of the water tank, and the water pump is connected with a connecting pipe through a water supply pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely is a multistage sewage treatment device. BACKGROUND

[0002] Sewage refers to the water from life and production that is polluted, and the water that loses the original use function is called sewage, and the water after use in life mainly contains more organic matters and is easy to handle.

[0003] Sewage treatment is a process of purifying sewage in order to meet the water quality requirements of being discharged into a water body or reused, and the method of sewage treatment includes physical method, chemical method and biological method, and the specific selection of the method depends on the nature of sewage, treatment target and economic and technical conditions, and the sewage after proper treatment can be safely discharged into the environment or used for agricultural irrigation, urban greening and other non-drinking purposes.

[0004] Chinese public patent number: CN213326990U discloses a multistage sewage treatment device, which comprises a processor, an input port and a sewage discharge port; the input port is located at one end of the processor, and the sewage to be treated is input into the processor; the sewage discharge port is located at the other end of the processor, and is connected with the inside of the processor to discharge the treated sewage. The multistage sewage treatment device provided by the utility model improves the sedimentation speed and reduces the cost of sewage treatment, and improves the treatment efficiency.

[0005] The prior art can treat sewage when in use, but mainly uses sedimentation filtration in the use process, has large occupied area, limited removal efficiency, difficult separation of sediments, uses only a single same filter screen for filtration, the single filter screen often cannot effectively filter out all sizes of particulate matters, has limited filtration range and lacks flexibility, and the filtration device lacks self-cleaning, when dust, dirt and other impurities accumulate on the filter screen, the filtration capacity of the filter screen will be affected, leading to a decrease in filtration efficiency, and further affecting the service life of the equipment. UTILITY MODEL CONTENTS

[0006] The utility model discloses a multistage sewage treatment device to solve the problem of the above background art that the main use is sedimentation filtration in the use process, the land occupation is big, the removal efficiency is limited, the sediment separation is difficult, and only a single same filter screen is used for filtration, the single filter screen often cannot effectively filter out all size particulates, the filtration range is limited and lacks flexibility, and the filtration device lacks self-cleaning, when the filter screen accumulates dust, dirt and other impurities, the filtration capacity is affected, leading to the filtration efficiency reduction, and further affecting the service life of the equipment.

[0007] In order to solve the above technical problems, the utility model provides the following technical scheme: a multistage sewage treatment device, including sewage pipe, one side of sewage pipe is provided with first filter subassembly, one side of sewage pipe is provided with second filter subassembly,

[0008] The first filter subassembly includes a filter tube, and the filter tube is fixedly connected to one side of the outer surface of the sewage pipe, a flange is fixedly connected to the bottom of the outer surface of the filter tube, a plurality of bolts are threadedly embedded in the interior of the flange, a flange cover is arranged on the side of the plurality of bolts away from the flange, a discharge port is fixedly connected to the bottom of the outer surface of the flange cover, and a filter basket is arranged in the interior of the filter tube.

[0009] The second filter subassembly includes a filter box, a rotating column is rotatably embedded in the interior of the filter box, a collar is fixedly connected to the outer surface of the rotating column, a plurality of connecting rods are fixedly connected to the outer surface of the collar, a filter barrel is fixedly connected to the outer surface of each of the plurality of connecting rods, a water tank is fixedly connected to one side of the outer surface of the filter box, a water pump is fixedly connected to the top of the outer surface of the water tank, a water delivery pipe is arranged in the interior of the water pump, and a connecting pipe is arranged on the side of the water delivery pipe away from the water pump.

[0010] Preferably, one side of the outer surface of the filter box is fixedly connected with a sewage outlet pipe, and a sewage discharge plate is arranged in the interior of the sewage outlet pipe, and the side of the sewage discharge plate away from the sewage outlet pipe is fixedly connected with the filter box.

[0011] Preferably, a water spraying head is fixedly connected to the side of the connecting pipe away from the water delivery pipe, the side of the water spraying head outer surface is fixedly connected with the filter box, a plurality of water spraying rings are arranged on the outer surface of the connecting pipe, a water spraying head is arranged in the interior of each of the plurality of water spraying rings, and a water inlet pipe is fixedly connected to the top of the outer surface of the water tank.

[0012] Preferably, a power belt disc is rotatably embedded in the interior of the filter box, and the side of the power belt disc outer surface is fixedly connected with the rotating column, a transmission belt disc is rotatably embedded in the interior of the filter box, and a belt is wound around the outer surface of the transmission belt disc, and the side of the belt away from the transmission belt disc is wound around the outer surface of the power belt disc.

[0013] Preferably, one side of the outer surface of the filter box is fixedly connected with a motor plate, and the top of the outer surface of the motor plate is provided with a rotary motor, and the output shaft of the rotary motor is fixedly connected with a power belt disc.

[0014] Preferably, the inside of the filter basket is provided with a plurality of large filter holes, the inside of the filter barrel is provided with a plurality of small filter holes, and the sewage pipe is arranged in the inside of the filter box away from the filter pipe.

[0015] Preferably, the inside of the filter box is provided with a liquid outlet pipe, and the liquid outlet pipe is provided with a liquid delivery pipe away from the filter box, the liquid delivery pipe is provided with a sedimentation tank away from the liquid outlet pipe, the inside of the sedimentation tank is provided with an activated carbon filter bed, the inside of the sedimentation tank is provided with a sand bed, the inside of the sedimentation tank is provided with a support plate, and the outside surface of the sedimentation tank is fixedly connected with a water outlet pipe.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] Firstly, the sewage pipe is connected with sewage, the outer surface of the sewage pipe is connected with a filter pipe, the inside of the filter pipe is provided with a filter basket, and the inside of the filter basket is provided with a plurality of large filter holes.

[0018] Second, the sewage treated initially by the utility model flows into the inside of the filter box through the filter pipe and the sewage pipe, the sewage directly enters the inside of the filter barrel through the sewage pipe, a plurality of small filter holes are arranged in the inside of the filter barrel, the filter holes of the plurality of small filter holes are smaller than the large filter holes, filtering is carried out through the filter box, when the impurities in the inside of the filter box are more, in order to prevent the impurities from flowing out, the rotary motor on the motor plate on one side of the outer surface of the filter box is started, the output shaft of the rotary motor is fixedly connected with the power belt disc, the rotary motor is driven to rotate the power belt disc, the power belt disc is driven to rotate through the belt, the transmission belt disc is driven to rotate through the belt, the rotary column connected with the transmission belt disc is driven to rotate, the rotary column is driven to rotate through the sleeve ring, the connecting rod is connected with the filter barrel, the filter barrel is driven to rotate through the rotary motor, the sewage is filtered through the plurality of small filter holes in the inside of the filter barrel, solid waste is left in the inside of the filter barrel, the water pump on the top of the water tank is started, the water pump is connected with the connecting pipe through the water supply pipe, the connecting pipe is provided with a plurality of water spraying rings, the water spraying rings are connected with the water spraying heads, clean water is added into the inside of the water tank through the water inlet pipe, the water is sprayed through the plurality of water spraying heads through the water pump, solid particles attached to the filter barrel are driven to the water spraying heads through the rotation of the filter barrel, the solid particles on the filter barrel are washed to the sewage discharge plate through the washing of the water spraying heads, then the solid particles are discharged through the sewage discharge pipe, the water tank and the water spraying heads realize the self-cleaning of the filter barrel, improve the filtering efficiency and prolong the service life, then the sewage flows into the inside of the sedimentation tank through the liquid feeding pipe and the liquid outlet pipe, in order to remove the particles after oxidation and any other pollutants, the sewage passes through the activated carbon filter bed and the sand bed, the activated carbon filter bed is composed of activated carbon particles and micro-sand, has a large surface area and rich pores and strong adsorption capacity, when the sewage passes through the activated carbon filter bed and the sand bed, the pollutants in the water can be captured and adsorbed to the surface of the activated carbon particles, the activated carbon filter bed removes biological and chemical elements, and the sand bed removes inorganic elements, the filtered water is discharged through the water outlet pipe, and the above technical scheme completes the treatment of the sewage. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic diagram of the utility model;

[0020] Figure 2 It is an anatomical three-dimensional structure schematic diagram of the utility model;

[0021] Figure 3 It is a three-dimensional structure schematic diagram of the first filter assembly of the utility model;

[0022] Figure 4 It is a three-dimensional structure schematic diagram of the second filter assembly of the utility model;

[0023] Figure 5 It is a part of the three-dimensional structure schematic diagram of the utility model.

[0024] Wherein: 1, sewage pipe; 101, liquid outlet pipe; 102, liquid feeding pipe; 103, water outlet pipe; 2, filter pipe; 201, flange; 202, flange cover; 203, bolt; 204, discharge port; 3, filter basket; 301, large filter hole; 4, filter box; 401, rotating column; 402, collar; 403, connecting rod; 404, belt; 405, transmission pulley; 406, power pulley; 5, water tank; 501, water inlet pipe; 502, water pump; 503, water feeding pipe; 504, connecting pipe; 505, water spraying ring; 506, water spraying head; 6, sewage discharge plate; 601, sewage outlet pipe; 7, filter bucket; 701, small filter hole; 8, rotating motor; 801, motor plate; 9, sedimentation tank; 901, activated carbon filter bed; 902, sand bed; 903, support plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0026] Please refer to Figures 1-5 A multi-stage sewage treatment device, comprising a box body 1, the inside of the box body 1 is provided with a scattering assembly, and the top of the box body 1 is provided with a quick-release assembly.

[0027] The first filter assembly comprises a filter pipe 2, which is fixedly connected to one side of the outer surface of the sewage pipe 1. The bottom of the outer surface of the filter pipe 2 is fixedly connected with a flange 201, and the inside of the flange 201 is threadedly embedded with a plurality of bolts 203. The side, away from the flange 201, of each of the plurality of bolts 203 is provided with a flange cover 202. The bottom of the outer surface of the flange cover 202 is fixedly connected with a discharge port 204. The inside of the filter pipe 2 is provided with a filter basket 3.

[0028] The second filter assembly comprises a filter box 4, and the inside of the filter box 4 is rotatably embedded with a rotating column 401. The outer surface of the rotating column 401 is fixedly connected with a collar 402, and the outer surface of the collar 402 is fixedly connected with a plurality of connecting rods 403. The outer surface of each of the plurality of connecting rods 403 is fixedly connected with a filter bucket 7. One side of the outer surface of the filter box 4 is fixedly connected with a water tank 5, and the top of the outer surface of the water tank 5 is fixedly connected with a water pump 502. The inside of the water pump 502 is provided with a water feeding pipe 503, and the side, away from the water pump 502, of the water feeding pipe 503 is provided with a connecting pipe 504.

[0029] Through the above technical scheme, the sewage pipe 1 is connected with sewage, the outer surface of the sewage pipe 1 is connected with the filter pipe 2, the inside of the filter pipe 2 is provided with the filter basket 3, the inside of the filter basket 3 is provided with a plurality of large filter holes 301, when the sewage enters the sewage pipe 1, the sewage flows into the inside of the filter basket 3, the internal impurities of the sewage are intercepted and blocked by the filter basket 3, and the clean liquid continues to flow back by the filter basket 3, the sewage in the sewage pipe 1 is preliminarily filtered by the filter basket 3, and the larger solid particles in the sewage are filtered out first, when it is needed to clean the filter basket 3, the discharge port 204 can be opened, the discharge port 204 is connected with the inside of the filter pipe 2, the solid particles flow out through the discharge port 204, when it is needed to clean the filter basket 3, the filter basket 3 is taken out after the plurality of bolts 203 are taken out and the connection between the flange 201 and the flange cover 202 is disconnected, and the inside of the filter pipe 2 can also be cleaned by opening the flange cover 202, so that the solid particles are prevented from being too large and from blocking the discharge port 204, the filter basket 3 is taken out, the filter basket 3 is cleaned and then is reloaded into the inside of the filter pipe 2, and the preliminary filtration treatment of the sewage is completed through the above technical scheme.

[0030] Through the above technical scheme, the sewage treated by the primary treatment flows into the inside of the filter box 4 through the filter pipe 2 and the sewage pipe 1, the sewage directly enters the inside of the filter barrel 7 through the sewage pipe 1, a plurality of small filter holes 701 are arranged in the inside of the filter barrel 7, the filter holes of the plurality of small filter holes 701 are smaller than the large filter holes 301, and the sewage is filtered through the filter box 4. When the impurities in the inside of the filter box 4 are relatively more, to prevent the impurities from flowing out, the rotary motor 8 on the motor plate 801 on one side of the outer surface of the filter box 4 is turned on, the output shaft of the rotary motor 8 is fixedly connected with the power belt disc 406, the rotary motor 8 is driven to rotate to drive the power belt disc 406 to rotate, the power belt disc 406 is driven to rotate through the belt 404 to drive the transmission belt disc 405 to rotate, the transmission belt disc 405 is driven to rotate to drive the connected rotating column 401 to rotate, the rotating column 401 is driven to rotate through the sleeve ring 402 to drive the connecting rod 403 to rotate, the connecting rod 403 is connected with the filter barrel 7, the filter barrel 7 is driven to rotate through the rotary motor 8, the sewage is filtered through the plurality of small filter holes 701 in the inside of the filter barrel 7, and the solid waste is left in the inside of the filter barrel 7. The water pump 502 on the top of the water tank 5 is turned on, the water pump 502 is connected with the connecting pipe 504 through the water feeding pipe 503, the connecting pipe 504 is provided with a plurality of water spraying rings 505, the water spraying rings 505 are connected with the water spraying heads 506, clean water is added into the inside of the water tank 5 through the water inlet pipe 501, the water is pumped out through the plurality of water spraying heads 506, solid particles attached to the filter barrel 7 are driven to the water spraying heads 506 through the rotation of the filter barrel 7, the solid particles on the filter barrel 7 are washed to the sewage discharge plate 6 through the flushing of the water spraying heads 506, and then are discharged through the sewage outlet pipe 601. The water tank 5 and the water spraying heads 506 realize the self-cleaning of the filter barrel 7, improve the filtering efficiency, prolong the service life, and then the sewage flows into the inside of the sedimentation tank 9 through the liquid feeding pipe 102 and the liquid outlet pipe 101 to remove the oxidized particles and any other pollutants. The sewage passes through the activated carbon filter bed 901 and the sand bed 902, the activated carbon filter bed 901 is composed of activated carbon particles and micro-sand, has a large surface area and rich pores, and has strong adsorption capacity. When the sewage passes through the activated carbon filter bed 901 and the sand bed 902, the pollutants in the water can be captured and adsorbed to the surface of the activated carbon particles. The activated carbon filter bed 901 removes biological and chemical elements, and the sand bed 902 removes inorganic elements. The filtered water is discharged through the water outlet pipe 103, and the sewage is treated through the above technical scheme.

[0031] Specifically, the filter box 4 is fixedly connected with the sewage outlet pipe 601 on one side of the outer surface, and the sewage outlet pipe 601 is provided with the sewage discharge plate 6.

[0032] Through the technical scheme, solid particles on the filter barrel 7 are washed to the blowdown plate 6, and then discharged through the blowdown pipe 601.

[0033] Specifically, the connecting pipe 504 is fixedly connected with a water jet head 506 away from one side of the water supply pipe 503, and one side of the outer surface of the water jet head 506 is fixedly connected with the filter box 4. The outer surface of the connecting pipe 504 is provided with a plurality of water jet rings 505, and the inside of each of the plurality of water jet rings 505 is provided with a water jet head 506. The top of the outer surface of the water tank 5 is fixedly connected with a water inlet pipe 501.

[0034] Through the technical scheme, clean water is added to the inside of the water tank 5 through the water inlet pipe 501, and the water is pumped out by the water pump 502 and sprayed through the plurality of water jet heads 506. The solid particles attached to the filter barrel 7 are driven to the water jet head 506 by the rotation of the filter barrel 7, and are washed by the water jet head 506.

[0035] Specifically, a power belt disc 406 is rotatably embedded in the inside of the filter box 4, and one side of the outer surface of the power belt disc 406 is fixedly connected with the rotating column 401. A transmission belt disc 405 is rotatably embedded in the inside of the filter box 4, and the outer surface of the transmission belt disc 405 is wrapped with a belt 404. One side of the belt 404 away from the transmission belt disc 405 is wrapped on the outer surface of the power belt disc 406.

[0036] Through the technical scheme, the rotation of the power belt disc 406 drives the transmission belt disc 405 to rotate through the belt 404. The rotation of the transmission belt disc 405 drives the connected rotating column 401 to rotate, and the rotating column 401 drives the connecting rod 403 to rotate through the sleeve ring 402.

[0037] Specifically, a motor plate 801 is fixedly connected to one side of the outer surface of the filter box 4, and a rotating motor 8 is arranged on the top of the outer surface of the motor plate 801. The output shaft of the rotating motor 8 is fixedly connected with the power belt disc 406.

[0038] Through the technical scheme, the rotating motor 8 on one side of the outer surface of the filter box 4 is turned on. The output shaft of the rotating motor 8 is fixedly connected with the power belt disc 406. The rotation of the rotating motor 8 drives the power belt disc 406 to rotate.

[0039] Specifically, a plurality of large filter holes 301 are arranged in the inside of the filter basket 3, a plurality of small filter holes 701 are arranged in the inside of the filter barrel 7, and the sewage pipe 1 is arranged in the inside of the filter box 4 away from the filter pipe 2.

[0040] Through the technical scheme, a plurality of small filter holes 701 are arranged in the inside of the filter barrel 7, and the filter holes of the plurality of small filter holes 701 are smaller than the large filter holes 301. The sewage directly enters the inside of the filter barrel 7 through the sewage pipe 1.

[0041] Specifically, the inside of the filter box 4 is provided with a liquid outlet pipe 101, and the side of the liquid outlet pipe 101 away from the filter box 4 is provided with a liquid delivery pipe 102, the side of the liquid delivery pipe 102 away from the liquid outlet pipe 101 is provided with a sedimentation tank 9, the inside of the sedimentation tank 9 is provided with an activated carbon filter bed 901, the inside of the sedimentation tank 9 is provided with a sand bed 902, the inside of the sedimentation tank 9 is provided with a support plate 903, and the outside surface of the sedimentation tank 9 is fixedly connected with a water outlet pipe 103.

[0042] Through the above technical scheme, the sewage flows into the inside of the sedimentation tank 9 through the liquid delivery pipe 102 and the liquid outlet pipe 101 to remove the oxidized particles and any other pollutants, and the sewage passes through the activated carbon filter bed 901 and the sand bed 902, the activated carbon filter bed 901 is composed of activated carbon particles and micro-sand, has a large surface area and rich pores, and has strong adsorption capacity, when the sewage passes through the activated carbon filter bed 901 and the sand bed 902, the pollutants in the water can be captured and adsorbed to the surface of the activated carbon particles, the activated carbon filter bed 901 removes biological and chemical elements, and the sand bed 902 removes inorganic elements, and the filtered water is discharged through the water outlet pipe 103 after the sedimentation tank 9 is filtered again.

[0043] In use, the sewage pipe 1 is connected to the sewage, the outer surface of the sewage pipe 1 is connected with the filter pipe 2, the inside of the filter pipe 2 is provided with the filter basket 3, the inside of the filter basket 3 is provided with a plurality of large filter holes 301, when the sewage enters the sewage pipe 1, the sewage flows into the inside of the filter basket 3, the internal impurities of the sewage are intercepted and blocked by the filter basket 3, and the clean liquid continues to flow backward through the filter basket 3, the sewage in the sewage pipe 1 is preliminarily filtered through the filter basket 3, and the larger solid particles in the sewage are filtered out first, when it is necessary to clean the filter basket 3, the discharge port 204 connected with the inside of the filter pipe 2 can be opened, the solid particles flow out through the discharge port 204, when it is necessary to clean the filter basket 3, the filter basket 3 is taken out after the plurality of bolts 203 are taken out and the flange 201 is disconnected from the flange cover 202, the inside of the filter pipe 2 can also be cleaned by opening the flange cover 202, so that the solid particles are prevented from being too large and blocking the discharge port 204, the filter basket 3 is taken out, the filter basket 3 is cleaned and then reloaded into the inside of the filter pipe 2, through the above technical solution, the sewage is preliminarily filtered and treated, the preliminarily treated sewage flows into the inside of the filter box 4 through the sewage pipe 1 after passing through the filter pipe 2, the sewage directly enters the inside of the filter barrel 7 through the sewage pipe 1, the inside of the filter barrel 7 is provided with a plurality of small filter holes 701, and the filter holes of the plurality of small filter holes 701 are smaller than the large filter holes 301, the sewage is filtered through the filter box 4, when the impurities in the inside of the filter box 4 are too much, in order to prevent the impurities from flowing out, the rotary motor 8 on the motor plate 801 on one side of the outer surface of the filter box 4 is opened, the output shaft of the rotary motor 8 is fixedly connected with the power belt pulley 406, the rotary motor 8 is rotated to drive the power belt pulley 406 to rotate, the power belt pulley 406 is rotated to drive the transmission belt pulley 405 to rotate through the belt 404, the transmission belt pulley 405 is rotated to drive the connected rotating column 401 to rotate, the rotating column 401 is rotated to drive the connecting rod 403 to rotate through the sleeve ring 402, the connecting rod 403 is connected with the filter barrel 7, the filter barrel 7 is driven to rotate through the rotary motor 8, the sewage is filtered through the plurality of small filter holes 701 in the inside of the filter barrel 7, and the solid waste is left in the inside of the filter barrel 7, the water pump 502 on the top of the water tank 5 is opened, the water pump 502 is connected with the connecting pipe 504 through the water delivery pipe 503, the connecting pipe 504 is provided with a plurality of water spraying rings 505, the water spraying rings 505 are connected with the water spraying heads 506, clean water is added into the inside of the water tank 5 through the water inlet pipe 501, the water is pumped out through the plurality of water spraying heads 506 through the water pump 502, the solid particles attached to the filter barrel 7 are driven to the water spraying heads 506 through the rotation of the filter barrel 7, the solid particles on the filter barrel 7 are washed to the sewage discharge plate 6 through the washing of the water spraying heads 506, and then are discharged through the sewage discharge pipe 601, the filter barrel 7 is self-cleaned through the water tank 5 and the water spraying heads 506, the filtering efficiency is improved, and the service life is prolonged, and then the sewage flows into the inside of the sedimentation tank 9 through the liquid delivery pipe 102 and the liquid outlet pipe 101,The sewage is filtered through the activated carbon filter bed 901 and the sand bed 902, the activated carbon filter bed 901 is composed of activated carbon particles and micro-sand, has a large surface area, a large number of pores and a strong adsorption capacity, when the sewage passes through the activated carbon filter bed 901 and the sand bed 902, the pollutants in the water can be captured and adsorbed on the surface of the activated carbon particles, the activated carbon filter bed 901 removes biological and chemical elements, and the sand bed 902 removes inorganic elements, the filtered water is filtered again through the sedimentation tank 9, and the filtered clean water is discharged through the water outlet pipe 103, and the sewage is treated through the above technical scheme.

[0044] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits, and the scope is defined by the appended claims and their equivalents.

Claims

1. A multi-stage sewage treatment device comprising a sewage pipe (1), characterized in that: One side of the sewage pipe (1) is provided with a first filter assembly, and one side of the sewage pipe (1) is provided with a second filter assembly; The first filter assembly comprises a filter pipe (2), and the filter pipe (2) is fixedly connected to one side of the outer surface of the sewage pipe (1); a flange (201) is fixedly connected to the bottom of the outer surface of the filter pipe (2), a plurality of bolts (203) are threadedly embedded in the inside of the flange (201), a flange cover (202) is arranged on the side away from the flange (201) of each of the plurality of bolts (203), a discharge port (204) is fixedly connected to the bottom of the outer surface of the flange cover (202), and a filter basket (3) is arranged in the inside of the filter pipe (2); The second filter assembly comprises a filter box (4), and a rotating column (401) is rotatably embedded in the inside of the filter box (4); a sleeve ring (402) is fixedly connected to the outer surface of the rotating column (401), a plurality of connecting rods (403) are fixedly connected to the outer surface of the sleeve ring (402), a filter barrel (7) is fixedly connected to the outer surface of each of the plurality of connecting rods (403), a water tank (5) is fixedly connected to one side of the outer surface of the filter box (4), a water pump (502) is fixedly connected to the top of the outer surface of the water tank (5), a water delivery pipe (503) is arranged in the inside of the water pump (502), and a connecting pipe (504) is arranged on the side away from the water pump (502) of the water delivery pipe (503).

2. A multi-stage sewage treatment apparatus according to claim 1, wherein: One side of the outer surface of the filter box (4) is fixedly connected with a sewage outlet pipe (601), and a sewage discharge plate (6) is arranged in the inside of the sewage outlet pipe (601); the side away from the sewage outlet pipe (601) of the sewage discharge plate (6) is fixedly connected with the filter box (4).

3. A multi-stage sewage treatment apparatus according to claim 1, wherein: A water spraying head (506) is fixedly connected to the side away from the water delivery pipe (503) of the connecting pipe (504), and the water spraying head (506) is fixedly connected with the filter box (4) on one side of the outer surface thereof; a plurality of water spraying rings (505) are arranged on the outer surface of the connecting pipe (504), and the water spraying head (506) is arranged in the inside of each of the plurality of water spraying rings (505); and a water inlet pipe (501) is fixedly connected to the top of the outer surface of the water tank (5).

4. A multi-stage sewage treatment apparatus according to claim 1, wherein: A power belt pulley (406) is rotatably embedded in the inside of the filter box (4), and one side of the outer surface of the power belt pulley (406) is fixedly connected with the rotating column (401); a transmission belt pulley (405) is rotatably embedded in the inside of the filter box (4), and a belt (404) is wound around the outer surface of the transmission belt pulley (405); and the belt (404) is wound around the outer surface of the power belt pulley (406) on the side away from the transmission belt pulley (405).

5. The multi-stage sewage treatment device according to claim 1, characterized in that: A motor plate (801) is fixedly connected to one side of the outer surface of the filter box (4), and a rotating motor (8) is arranged on the top of the outer surface of the motor plate (801); and the output shaft of the rotating motor (8) is fixedly connected with the power belt pulley (406).

6. A multi-stage sewage treatment apparatus according to claim 1, wherein: The inside of the filter basket (3) is provided with a plurality of large filter holes (301), the inside of the filter barrel (7) is provided with a plurality of small filter holes (701), and the sewage pipe (1) is arranged in the inside of the filter box (4) away from the filter pipe (2).

7. A multi-stage sewage treatment apparatus according to claim 1, wherein: The inside of the filter box (4) is provided with a liquid outlet pipe (101), and the side, away from the filter box (4), of the liquid outlet pipe (101) is provided with a liquid delivery pipe (102). The side, away from the liquid outlet pipe (101), of the liquid delivery pipe (102) is provided with a sedimentation tank (9). The inside of the sedimentation tank (9) is provided with an activated carbon filter bed (901). The inside of the sedimentation tank (9) is provided with a sand bed (902). The inside of the sedimentation tank (9) is provided with a support plate (903). The outside surface of the sedimentation tank (9) is fixedly connected with a water outlet pipe (103).

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