Sewage treatment system and sewage treatment method

Abstract

The invention belongs to the technical field of sewage treatment, and provides a sewage treatment system and a sewage treatment method.The sewage treatment system comprises a shell and a cover plate, the shell is detachably connected with the cover plate, the shell is communicated with a drainage pipe, the cover plate is communicated with a water inlet pipe, a filter cartridge is fixedly installed in the shell, the filter cartridge and the shell are coaxially arranged, and the filter cartridge and the cover plate are detachably connected. And a stirring shaft is rotationally mounted on the cover plate. Compared with the prior art, the dust removal device has the beneficial effects that when the dust removal cylinder revolves, one side edge of the collecting groove scrapes impurities on the inner wall of the filter cylinder, meanwhile, due to rotation of the dust removal cylinder, liquid can flow into the dust removal cylinder and flow out of the filter holes, and therefore the scraped impurities can enter the dust removal cylinder along with sewage and are stored in the dust removal cylinder; therefore, the impurities scraped from the side wall of the filter cartridge can be collected and stored, and the impurities cleaned from the filter cartridge are prevented from being adhered to the filter cartridge again.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment system and a sewage treatment method. Background Art

[0002] Sewage treatment is the process of purifying sewage to meet the water quality requirements for discharge into a certain water body or reuse. It is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical care and catering. Modern wastewater treatment methods are mainly divided into three categories: physical treatment, chemical treatment and biological treatment. Physical treatment separates and recovers suspended pollutants in wastewater through physical action. Wastewater treatment methods can be divided into gravity separation, centrifugal separation and screening interception.

[0003] When using the centrifugal method to treat sewage, the sewage is filtered through a centrifugal barrel. However, as the filtering time increases, impurities accumulate on the centrifugal barrel, which easily causes clogging of the centrifugal water outlet holes on the centrifugal barrel, thereby reducing the sewage filtration efficiency. In response to the above technical problems, a Chinese patent with patent announcement number CN215288210U lightly brushes the inner wall of the inner barrel with a rotating scraper to prevent it from being blocked by impurities and affecting the water outlet speed. However, after the scraper enters the next area, the sewage will again carry impurities and contact the inner barrel, and the impurities scraped off by the scraper still exist in the inner barrel and move randomly, resulting in poor cleaning effect on the inner barrel and reduced filtering effect. Summary of the invention

[0004] The object of the present invention is to provide a sewage treatment system and a sewage treatment method, aiming to solve the technical problem in the prior art that the cleaning effect of the filter component is poor resulting in poor filtering effect.

[0005] The present invention is achieved in this way. A sewage treatment system includes a shell and a cover plate. The shell and the cover plate are detachably connected. The shell is connected to a drain pipe, and the cover plate is connected to a water inlet pipe. A filter cartridge is fixedly installed in the shell, and the filter cartridge is coaxially arranged with the shell. A stirring shaft is rotatably installed on the cover plate, and a rotating power part for driving the stirring shaft to rotate is fixedly installed on the cover plate. The stirring shaft is coaxially arranged with the shell and a plurality of groups of symmetrically distributed stirring plates are fixedly installed on the stirring shaft. A dust removal cylinder is arranged at the end of the stirring plate. A collecting groove is provided on the dust removal cylinder and a side close to the filter cartridge, and one side of the collecting groove is in sliding contact with the filter cartridge. Filter holes are provided on the side wall of the dust removal cylinder away from the filter cartridge.

[0006] Further technical solution: a coaxially arranged collecting shaft is rotatably installed in the dust collecting barrel, the collecting shaft is coaxially arranged with the dust collecting barrel and a spiral blade is fixedly installed on the collecting shaft, the spiral blade is in sliding contact with the inner wall of the dust collecting barrel, a discharge trough is opened at the top of the dust collecting barrel, the top of the collecting shaft extends out of the dust collecting barrel and a gear is fixedly installed at the end, the gear is meshed with a gear ring fixedly installed on the cover plate, and the gear ring is coaxially arranged with the shell.

[0007] Further technical solution: A collecting filter box is slidably installed in the shell, the collecting filter box is an annular structure and the top is an open structure, the collecting filter box is in sliding contact with the inner wall of the shell and a plurality of support plates for supporting the collecting filter box are fixedly installed on the inner wall of the shell, and the collecting filter box is located at the discharge end of the discharge trough.

[0008] Further technical solution: a water pump is fixedly installed on the cover plate, the water pump is connected to a first branch pipe and a second branch pipe, the first branch pipe is connected to a water pumping box fixedly installed on the dust collection cylinder, the water pumping box is located on the side wall of the dust collection cylinder away from the filter cylinder, and the filter hole is located in the coverage area of ​​the water pumping box.

[0009] Further technical solution: two groups of annular mounting plates are fixedly installed on the stirring shaft, and a closing plate is installed on the two groups of mounting plates for rotation together. The mounting plates and the closing plates form a transfer chamber. The first branch pipe is fixedly connected to the closing plate and communicated with the transfer chamber. A water pumping pipe is fixedly installed on the lower mounting plate, and the water pumping pipe is communicated with the water pumping box and the transfer chamber.

[0010] Further technical solution: A plurality of flushing boxes are arranged at the output end of the second branch pipe. The flushing boxes are located on the outside of the filter cartridge and correspond to the position of the dust removal cartridge. One side surface of the flushing boxes is in sliding contact with the outer side surface of the filter cartridge. A plurality of flushing holes are provided on the surface in contact with the filter cartridge.

[0011] Further technical solution: a connecting ring is fixedly installed at one end of the second branch pipe away from the water pump. The cross-section of the connecting ring is a U-shaped structure and the connecting ring is connected to the second branch pipe. A connecting plate is rotatably installed on the open end of the connecting ring. The connecting plate and the connecting ring form a closed area. Multiple groups of connecting pipes are fixedly installed on the connecting plate. The connecting pipes are connected to the corresponding flushing boxes and the closed area formed by the connecting plate and the connecting ring.

[0012] The present invention also provides a sewage treatment method, which is applied to the sewage treatment system described above, and comprises the following steps: Step S1: The cover plate is assembled and fixed to the shell, the sewage to be filtered is transported into the shell through the water inlet pipe, the sewage is filtered through the filter cartridge, and the filtered sewage is discharged through the drain pipe. During the filtration, the water level in the shell is made to exceed the height of the collection tank and maintained; Step S2: The stirring shaft is driven to rotate by the rotating power member, and the stirring shaft drives the stirring plate and the dust removal cylinder to rotate and causes the sewage inside the filter cylinder to rotate, thereby accelerating the filtration of the sewage under the action of centrifugal force; Step S3: When the dust removal cylinder rotates, its side wall scrapes and cleans the impurities on the filter cylinder, and the cleaned impurities enter the dust removal cylinder.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. When the dust collector is in orbit, one side of the collecting trough scrapes off the impurities on the inner wall of the filter cartridge. At the same time, due to the rotation of the dust collector, liquid will flow into the dust collector and out of the filter hole, so that the scraped impurities will follow the sewage into the dust collector and be stored in the dust collector, so that the impurities scraped off the side wall of the filter cartridge can be collected and stored, avoiding the impurities cleaned from the filter cartridge from adhering to the filter cartridge again, and the impurities in the sewage can also enter the dust collector through the collecting trough, thereby reducing the impurity content in the sewage inside the filter cartridge, reducing the probability of filter cartridge blockage, and improving the sewage filtering effect.

[0014] 2. When the stirring shaft rotates, it drives the dust collector to revolve. When the dust collector revolves, the collecting shaft rotates on itself under the action of the gear and the gear ring. The rotation of the collecting shaft drives the spiral blade to rotate, so that part of the sewage in the impurity box in the dust collector moves upward under the push of the spiral blade. Finally, the impurities leave the dust collector through the discharge chute and fall into the collection filter box. In the process of collecting impurities, the impurities collected in the dust collector can be discharged from the filter cartridge to avoid the impurities in the dust collector from contacting the filter cartridge again, avoiding the presence of a large amount of impurities in the sewage in the filter cartridge, and further reducing the probability of impurities clogging the filter cartridge.

[0015] 3. The sewage pumped out by the water pump is transported to the flushing box. Under the action of pressure, the filtered sewage is sprayed toward the filter cartridge from the flushing hole. Since the flushing box corresponds to the collecting slot on the dust removal cartridge, and less sewage flows out from this position on the filter cartridge under the shielding of the dust removal cartridge and the flushing box, the sewage sprayed from the flushing box can pass through the filter cartridge and push the sewage inside the filter cartridge into the dust removal cartridge, thereby realizing the backwashing of the filter cartridge and further reducing the possibility of clogging of the filter cartridge. The sewage will further carry impurities into the dust removal cartridge, further improving the collection effect of impurities, which is beneficial to the filtering and use of sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the explosion structure of the present invention.

[0019] Figure 4This is a schematic diagram of the structure of the dust removal cylinder from the first perspective of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the dust removal cylinder from a second viewing angle in the present invention.

[0021] Figure 6 for Figure 2 A magnified schematic diagram of the A1 region in the middle.

[0022] Figure 7 for Figure 2 A magnified schematic diagram of the A2 region in the middle.

[0023] Figure 8 for Figure 2 A magnified schematic diagram of the A3 region in the middle.

[0024] In the attached drawings: 1. Shell; 2. Cover plate; 3. Stirring shaft; 4. Stirring plate; 5. Rotating power part; 6. Pumping box; 7. Dust removal cylinder; 8. Collecting trough; 9. Collecting shaft; 10. Spiral blade; 11. Filter hole; 12. Gear; 13. Gear ring; 14. Water inlet pipe; 15. Mounting plate; 16. Closing plate; 17. Water pump; 18. First branch pipe; 19. Second branch pipe; 20. Pumping pipe; 21. Connecting ring; 22. Discharge trough; 23. Collecting filter box; 24. Support plate; 25. Filter cartridge; 26. Drain pipe; 27. Transfer chamber; 28. Flushing box; 29. ​​Flushing hole; 30. Connecting plate; 31. Connecting pipe. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] like Figure 1-Figure 8 As shown, a sewage treatment system provided by the present invention comprises a shell body 1 and a cover plate 2, the shell body 1 and the cover plate 2 are detachably connected, the shell body 1 is connected with a drain pipe 26, the cover plate 2 is connected with a water inlet pipe 14, a filter cartridge 25 is fixedly installed in the shell body 1, the filter cartridge 25 is coaxially arranged with the shell body 1, a stirring shaft 3 is rotatably installed on the cover plate 2, a rotating power member 5 for driving the stirring shaft 3 to rotate is fixedly installed on the cover plate 2, the stirring shaft 3 is coaxially arranged with the shell body 1 and a plurality of groups of symmetrically distributed stirring plates 4 are fixedly installed on the stirring shaft 3, a dust removal cylinder 7 is arranged at the end of the stirring plate 4, a collecting groove 8 is opened on the dust removal cylinder 7 and a side close to the filter cartridge 25, and one side of the collecting groove 8 is in sliding contact with the filter cartridge 25, and a filter hole 11 is opened on the side wall of the dust removal cylinder 7 away from the filter cartridge 25.

[0028] In actual application of this embodiment, the sewage to be filtered is transported to the housing 1 through the water inlet pipe 14, and the sewage falls into the inner area of ​​the filter cartridge 25, so that the water level in the housing 1 exceeds the height of the collecting tank 8 and is maintained, and at the same time, the stirring shaft 3 is driven to rotate by the lower rotating power member 5, and the stirring shaft 3 can drive the sewage in the filter cartridge 25 to rotate through the stirring plate 4 and the dust removal cylinder 7, thereby accelerating the speed of the sewage passing through the filter cartridge 25 under the action of centrifugal force, and accelerating the filtration speed of the sewage; The sewage passes through the filter cartridge 25 and leaves through the drain pipe 26, and will remain in the filter cartridge 25 and some impurities will adhere to the filter cartridge 25. When the dust collector 7 revolves, one side of the collecting groove 8 scrapes the impurities on the inner wall of the filter cartridge 25. At the same time, due to the rotation of the dust collector 7, the liquid will flow into the dust collector 7 and flow out from the filter hole 11, so that the scraped impurities will follow the sewage into the dust collector 7 and be stored in the dust collector 7, so that the impurities scraped off the side wall of the filter cartridge 25 can be collected and stored, avoiding the impurities cleaned from the filter cartridge 25 from adhering to the filter cartridge 25 again, and the impurities in the sewage can also enter the dust collector 7 through the collecting groove 8, thereby reducing the impurity content in the sewage inside the filter cartridge 25, reducing the probability of blockage of the filter cartridge 25, and improving the filtering effect of sewage.

[0029] In one example of the present embodiment, the rotating power part 5 is a motor, and of course it can also be other parts that can output rotational power such as a hydraulic motor. The motor drives the stirring shaft 3 to rotate, and the cover plate 2 and the shell 1 can be fixedly connected by fixing screws, or by other means such as threads, to facilitate subsequent disassembly of the cover plate 2 for cleaning.

[0030] like Figure 1-Figure 3 As shown, a sewage treatment system provided by the present invention is provided, wherein a coaxially arranged collecting shaft 9 is rotatably installed in the dust collecting cylinder 7, the collecting shaft 9 is coaxially arranged with the dust collecting cylinder 7 and a spiral blade 10 is fixedly installed on the collecting shaft 9, the spiral blade 10 is in sliding contact with the inner wall of the dust collecting cylinder 7, a discharge chute 22 is provided at the top of the dust collecting cylinder 7, the top of the collecting shaft 9 extends out of the dust collecting cylinder 7 and a gear 12 is fixedly installed at the end, the gear 12 is meshed with a gear ring 13 fixedly installed on the cover plate 2, and the gear ring 13 is coaxially arranged with the housing 1.

[0031] Specifically, a collecting filter box 23 is slidably installed in the shell 1. The collecting filter box 23 is an annular structure with an open structure at the top. The collecting filter box 23 is in sliding contact with the inner wall of the shell 1 and a plurality of support plates 24 for supporting the collecting filter box 23 are fixedly installed on the inner wall of the shell 1. The collecting filter box 23 is located at the discharge end of the discharge trough 22.

[0032] In actual application of this embodiment, when the stirring shaft 3 rotates, it drives the dust collector 7 to revolve. When the dust collector 7 revolves, the collecting shaft 9 rotates on itself under the action of the gear 12 and the ring gear 13. The rotation of the collecting shaft 9 drives the spiral blade 10 to rotate, so that under the push of the spiral blade 10, part of the sewage in the impurity box in the dust collector 7 moves to the upper side, and finally the impurities leave the dust collector 7 through the discharge chute 22 and fall into the collecting filter box 23. The sewage will fall through the collecting filter box 23, so that the impurities collected in the dust collector 7 can be discharged from the filter cartridge 25 during the impurity collection process, so as to avoid the impurities in the dust collector 7 from contacting the filter cartridge 25 again, and avoid the presence of a large amount of impurities in the sewage in the filter cartridge 25, thereby further reducing the probability of impurities clogging the filter cartridge 25.

[0033] like Figure 1-Figure 8 As shown, a sewage treatment system provided by the present invention is provided, a water pump 17 is fixedly installed on the cover plate 2, the water pump 17 is connected to a first branch pipe 18 and a second branch pipe 19, the first branch pipe 18 is connected to a water pumping box 6 fixedly installed on the dust removal cylinder 7, the water pumping box 6 is located on the side wall of the dust removal cylinder 7 away from the filter cylinder 25, and the filter hole 11 is located in the coverage area of ​​the water pumping box 6.

[0034] Specifically, two groups of annular mounting plates 15 are fixedly installed on the stirring shaft 3, and a closing plate 16 is installed on the two groups of mounting plates 15 for rotation together. The mounting plates 15 and the closing plates 16 form a transfer chamber 27. The first branch pipe 18 is fixedly connected to the closing plate 16 and communicated with the transfer chamber 27. A water pumping pipe 20 is fixedly installed on the lower mounting plate 15, and the water pumping pipe 20 is communicated with the water pumping box 6 and the transfer chamber 27.

[0035] Specifically, a plurality of flushing boxes 28 are provided at the output end of the second branch pipe 19. The flushing boxes 28 are located outside the filter cartridge 25 and correspond to the position of the dust removal cartridge 7. One side surface of the flushing boxes 28 is in sliding contact with the outer side surface of the filter cartridge 25. The surface of the flushing boxes 28 in contact with the filter cartridge 25 is provided with a plurality of flushing holes 29 distributed at intervals.

[0036] Specifically, a connecting ring 21 is fixedly installed at one end of the second branch pipe 19 away from the water pump 17. The cross-section of the connecting ring 21 is a U-shaped structure and the connecting ring 21 is connected to the second branch pipe 19. A connecting plate 30 is rotatably installed on the open end of the connecting ring 21. The connecting plate 30 and the connecting ring 21 form a closed area. A plurality of connecting tubes 31 are fixedly installed on the connecting plate 30. The connecting tubes 31 are connected to the corresponding flushing boxes 28 and the closed area formed by the connecting plate 30 and the connecting ring 21.

[0037] In actual application of this embodiment, the water pump 17 extracts air in the transfer chamber 27 through the first branch pipe 18 to make the transfer chamber 27 in a negative pressure state, so that the sewage in the water pumping box 6 can enter the transfer chamber 27 through the water pumping pipe 20, and then the water pump 17 can continuously extract the sewage in the water pumping box 6, and the sewage in the dust removal cylinder 7 is continuously replenished into the water pumping box 6 through the filter hole 11, so as to prevent impurities from entering the water pumping box 6. At the same time, the spiral blade 10 can continuously clean the filter hole 11 when rotating, so that the sewage in the dust removal cylinder 7 continues to move to one side of the water pumping box 6, and the sewage outside the dust removal cylinder 7 is replenished into the dust removal cylinder 7 through the collecting tank 8, so that the sewage flows into the dust removal cylinder 7, thereby driving the impurities to enter the dust removal cylinder 7 better, reducing the possibility of impurities flowing out of the dust removal cylinder 7, and further improving the collection and cleaning effect of impurities; The sewage pumped out by the water pump 17 is transported to the closed area surrounded by the connecting plate 30 and the connecting ring 21 through the second branch pipe 19, and then the sewage is transported to the flushing box 28 through the connecting pipe 31. Under the action of pressure, the filtered sewage is sprayed toward the filter cartridge 25 from the flushing hole 29. Since the flushing box 28 corresponds to the position of the collecting slot 8 on the dust removal cartridge 7, and less sewage flows out from this position on the filter cartridge 25 under the shielding of the dust removal cartridge 7 and the flushing box 28, the sewage sprayed from the flushing box 28 can pass through the filter cartridge 25 and push the sewage inside the filter cartridge 25 into the dust removal cartridge 7, thereby realizing the backwashing of the filter cartridge 25, further reducing the possibility of clogging of the filter cartridge 25, and the sewage will further carry impurities into the dust removal cartridge 7, further improving the collection effect of impurities, which is beneficial to the filtering and use of sewage.

[0038] like Figure 1-Figure 8 As shown, a sewage treatment method provided by the present invention is applied to the sewage treatment system described above, and comprises the following steps: Step S1: The cover plate 2 is assembled and fixed to the housing 1, and the sewage to be filtered is transported into the housing 1 through the water inlet pipe 14, and the sewage is filtered through the filter cartridge 25. The filtered sewage is discharged through the drain pipe 26. During the filtering, the water level in the housing 1 is made to exceed the height of the collecting tank 8 and maintained; Step S2: The stirring shaft 3 is driven to rotate by the rotating power member 5, and the stirring shaft 3 drives the stirring plate 4 and the dust removal cylinder 7 to rotate and causes the sewage inside the filter cylinder 25 to rotate, thereby accelerating the filtration of the sewage under the action of centrifugal force; Step S3: When the dust removal cylinder 7 rotates, its side wall scrapes and cleans the impurities on the filter cylinder 25, and the cleaned impurities enter the dust removal cylinder 7.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sewage treatment system, comprising a housing (1) and a cover plate (2), wherein the housing (1) and the cover plate (2) are detachably connected, a drain pipe (26) is connected to the housing (1), and a water inlet pipe (14) is connected to the cover plate (2), wherein: A filter cartridge (25) is fixedly mounted in the shell (1), the filter cartridge (25) and the shell (1) are arranged coaxially, a stirring shaft (3) is rotatably mounted on the cover plate (2), a rotating power member (5) for driving the stirring shaft (3) to rotate is fixedly mounted on the cover plate (2), the stirring shaft (3) and the shell (1) are arranged coaxially, and a plurality of groups of symmetrically distributed stirring plates (4) are fixedly mounted on the stirring shaft (3), a dust removal cartridge (7) is arranged at the end of the stirring plate (4), a collecting groove (8) is provided on the dust removal cartridge (7) and a side close to the filter cartridge (25), and one side of the collecting groove (8) is in sliding contact with the filter cartridge (25), and a filter hole (11) is provided on a side wall of the dust removal cartridge (7) away from the filter cartridge (25).

2. A sewage treatment system according to claim 1, characterized in that: A coaxially arranged collecting shaft (9) is rotatably mounted in the dust collecting cylinder (7), the collecting shaft (9) is coaxially arranged with the dust collecting cylinder (7) and a spiral blade (10) is fixedly mounted on the collecting shaft (9), the spiral blade (10) is in sliding contact with the inner wall of the dust collecting cylinder (7), a discharge trough (22) is provided at the top of the dust collecting cylinder (7), the top of the collecting shaft (9) extends out of the dust collecting cylinder (7) and a gear (12) is fixedly mounted at the end, the gear (12) is meshed with a gear ring (13) fixedly mounted on the cover plate (2), and the gear ring (13) is coaxially arranged with the housing (1).

3. A sewage treatment system according to claim 2, characterized in that: A collecting filter box (23) is slidably mounted in the shell (1); the collecting filter box (23) is an annular structure with an open top; the collecting filter box (23) is in sliding contact with the inner wall of the shell (1); and a plurality of groups of support plates (24) for supporting the collecting filter box (23) are fixedly mounted on the inner wall of the shell (1); the collecting filter box (23) is located at the discharge end of the discharge trough (22).

4. A sewage treatment system according to claim 1, characterized in that: A water pump (17) is fixedly mounted on the cover plate (2); the water pump (17) is connected to a first branch pipe (18) and a second branch pipe (19); the first branch pipe (18) is connected to a water pumping box (6) fixedly mounted on the dust removal cylinder (7); the water pumping box (6) is located on a side wall of the dust removal cylinder (7) away from the filter cylinder (25); and the filter hole (11) is located within the coverage area of ​​the water pumping box (6).

5. A sewage treatment system according to claim 4, characterized in that: Two groups of mounting plates (15) of annular structures are fixedly mounted on the stirring shaft (3); a closing plate (16) is rotatably mounted on the two groups of mounting plates (15); the mounting plates (15) and the closing plate (16) enclose a transfer chamber (27); a first branch pipe (18) is fixedly connected to the closing plate (16) and communicates with the transfer chamber (27); a water pumping pipe (20) is fixedly mounted on the lower mounting plate (15); the water pumping pipe (20) is communicated with the water pumping box (6) and the transfer chamber (27).

6. A sewage treatment system according to claim 5, characterized in that: The output end of the second branch pipe (19) is provided with a plurality of flushing boxes (28), the flushing boxes (28) being located outside the filter cartridge (25) and corresponding to the position of the dust removal cartridge (7), one side surface of the flushing boxes (28) being in sliding contact with the outer side surface of the filter cartridge (25), and a plurality of flushing holes (29) distributed at intervals are provided on the surface of the flushing boxes (28) in contact with the filter cartridge (25).

7. A sewage treatment system according to claim 4, characterized in that: A connecting ring (21) is fixedly mounted on one end of the second branch pipe (19) away from the water pump (17); the connecting ring (21) has a U-shaped cross-section and is connected to the second branch pipe (19); a connecting plate (30) is rotatably mounted on the open end of the connecting ring (21); the connecting plate (30) and the connecting ring (21) form a closed area; a plurality of connecting pipes (31) are fixedly mounted on the connecting plate (30); the connecting pipes (31) are connected to corresponding flushing boxes (28) and the closed area formed by the connecting plate (30) and the connecting ring (21).

8. A method for treating sewage, characterized in that: A sewage treatment system as claimed in any one of claims 1 to 7, comprising the following steps: Step S1: the cover plate (2) and the housing (1) are assembled and fixed, sewage to be filtered is transported into the housing (1) through the water inlet pipe (14), the sewage is filtered through the filter cartridge (25), and the filtered sewage is discharged through the drain pipe (26). During the filtering process, the water level in the housing (1) is made to exceed the height of the collection tank (8) and is maintained there; Step S2: the stirring shaft (3) is driven to rotate by the rotating power member (5), and the stirring shaft (3) drives the stirring plate (4) and the dust removal cylinder (7) to rotate and causes the sewage inside the filter cylinder (25) to rotate, thereby accelerating the filtration of the sewage under the action of centrifugal force; Step S3: When the dust removal cylinder (7) rotates, its side wall scrapes and cleans the impurities on the filter cylinder (25), and the cleaned impurities enter the dust removal cylinder (7).

Images