A domestic sewage treatment system combining biological filter and artificial wetland

Abstract

The present invention discloses a domestic sewage treatment system coupled with a biological filter and an artificial wetland, comprising a filter residue device, a PE ecological filter, and a PE artificial wetland, which are sequentially connected via pipelines. The filter residue device includes a filter box, a crushing box provided on the filter box, a feeding hopper provided on the crushing box, a crushing blade group provided within the crushing box, the crushing blade group including a first blade and a second blade, a gear box provided outside the crushing box, a gear group provided within the gear box for synchronous rotation of the first blade and the second blade, a mesh frame provided within the filter box, and a filter screen provided on the mesh frame. The present invention overcomes the shortcomings of the prior art, has a reasonable design, optimizes the problem of repeated cleaning of the filter screen during filtration, reduces the frequency of filter screen replacement and manual cleaning, thereby improving its working efficiency, and has high social value and application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a domestic sewage treatment system coupled with a biological filter and an artificial wetland. Background Art

[0002] In the process of treating domestic sewage, biological filters can be used in combination with artificial wetlands to treat domestic sewage, which can improve the treatment efficiency of domestic sewage. It is a combined water treatment process that combines biology and ecology.

[0003] When treating domestic sewage, the sewage contains a certain amount of large pollutants, which need to be removed through crushing and filtration to ensure the efficiency of subsequent sewage treatment.

[0004] However, the existing crushing and filtering treatment equipment needs to frequently replace the filter screen during use to maintain the filter screen's filtering effect on the sewage, which requires the equipment to be shut down for replacement, thereby reducing the sewage treatment efficiency.

[0005] Short-term filter flushing can also have a cleaning effect, but it consumes a lot of water resources, which increases the cost of sewage treatment.

[0006] To this end, the inventors have designed and developed a domestic sewage treatment system that can effectively clean the filter screen after filtration treatment, without the need for frequent replacement and flushing operations of the filter screen. Summary of the Invention

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A domestic sewage treatment system coupled with a biological filter and an artificial wetland comprises a filter residue device, a PE ecological filter, and a PE artificial wetland connected in sequence through pipelines. The filter residue device comprises a filter box, a crushing box is provided on the filter box, a feeding hopper is provided on the crushing box, a crushing knife group is provided in the crushing box, the crushing knife group comprises a first blade and a second blade, a gear box is provided outside the crushing box, a gear group is provided in the gear box for synchronous rotation of the first blade and the second blade, a mesh frame is further provided in the filter box, and a filter mesh is provided on the mesh frame.

[0009] Preferably, the gear set includes a driving gear that drives the first blade to rotate, and a driven gear that drives the second blade to rotate. The driving gear is provided with a first step pulley, and a synchronous gear that meshes and matches with the first step pulley is provided in the gear box. The synchronous gear is provided with a second step pulley, and the gear box is also provided with a transmission gear that meshes and matches with the second step pulley. The gear box is provided with a drive motor that provides rotational output for the driving gear.

[0010] Preferably, a reciprocating swing mechanism is provided in the crushing box, which includes a transmission shaft connected to a transmission gear, an incomplete toothed disc is provided at the other end of the transmission shaft, a rocker arm is provided on the inner side of the crushing box, and a gear disc is provided on the rocker arm that meshes with the incomplete toothed disc.

[0011] Preferably, the rocker arm is provided with a protective shell for protecting the incomplete toothed disc and the gear disc, and the protective shell is connected to the inner side surface of the crushing box.

[0012] Preferably, a connecting rod is provided on the rocker arm, and the other end of the connecting rod is connected to a sweeping plate in contact with the surface of the filter screen.

[0013] Preferably, the sweeping plate is provided with a plate cleaning mechanism, the inner side of the filter box is provided with a wheel groove, and the inner side of the filter box is provided with a rack;

[0014] The plate cleaning mechanism includes a reciprocating screw rotatably connected to the sweeping plate, both ends of the reciprocating screw are provided with spur gears meshing with the rack, the spur gears are provided with guide wheels matching the wheel groove guide, and the reciprocating screw is provided with an attachment component.

[0015] Preferably, the collecting assembly includes a transverse block that is rotatably mounted on the reciprocating screw, and scrapers are provided on both sides of the transverse block, and the scrapers are provided with a collection baffle.

[0016] Preferably, a cover plate is provided on the outside of the filter box to provide sealing for the wheel groove, and a discharge pipe is connected to the outside of the filter box.

[0017] Preferably, a sewage box is provided on both sides of the filter box, a sewage pipe is connected to the sewage box, a transition box is provided on the sewage box, and a spray plate is provided on the transition box.

[0018] Preferably, the side of the spray plate located inside the transition box is connected to a spray pipe, and the side of the spray plate located outside the transition box is provided with a water distribution pipe connected to the spray pipe.

[0019] Preferably, the PE artificial wetland is a subsurface artificial wetland, which is provided with a stone layer, a gravel layer, and a vegetation planting layer from bottom to top, and a water distribution pipe connected to the PE ecological filter is laid in the stone layer.

[0020] Preferably, the PE ecological filter is divided into three sequentially connected chambers from left to right, the left chamber is a sedimentation tank, the middle chamber is an anaerobic membrane bioreactor tank, and the right chamber is a clear water tank.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Through the setting of the gear group, the mutual cooperation between the driving motor, the crushing knife group, the gear group, the reciprocating swing mechanism and the sweeping plate can be used to swing back and forth when the first blade and the second blade are processing the sewage with pollutants, so as to centrally clean the pollutants on the surface of the filter screen, avoiding the need to repeatedly clean the filter screen and improving the filtration efficiency of the filter screen in long-term use.

[0023] 2. By setting up a reciprocating swing mechanism and utilizing the intermittent meshing matching between the incomplete toothed disc and the gear disc, the incomplete toothed disc can intermittently mesh with the two gear discs respectively without adjusting the rotation direction, allowing the rocker arm to intermittently rotate clockwise and counterclockwise.

[0024] 3. Through the setting of the plate cleaning mechanism and the mutual cooperation between the rack and the plate cleaning mechanism, when the sweeping plate drives the plate cleaning mechanism to move, the spur gear and the rack can be meshed and matched, so that the attachment assembly can scrape off the stubborn attachments on the surface of the sweeping plate and push them in a concentrated manner.

[0025] 4. Through the setting of the sewage box and the cooperation between the transition box and the spray plate, when the sweeping plate swings close to the transition box, the spray pipe can spray the surface of the sweeping plate and the scraper, so that the pollutants fall into the interior of the sewage box for collection, which is convenient for centralized cleaning and discharge of pollutants.

[0026] 5. Through the coupling treatment of PE ecological filter and PE artificial wetland, the sewage treated by PE ecological filter flows into PE artificial wetland, where it can be filtered by stone layer, filtered and intercepted by gravel layer, and the microorganisms and plant roots in vegetation layer work together to degrade organic matter, and the biological synergistic denitrification and phosphorus removal process ultimately achieves the purpose of effectively removing pollutants.

[0027] In summary, the present invention overcomes the shortcomings of the existing technology, has a reasonable design, optimizes the problem of repeated cleaning of the filter during filtration processing, reduces the frequency of filter replacement and manual cleaning, thereby improving its work efficiency, and has high social use value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 Schematic diagram of the system flow of the present invention;

[0030] Figure 2 It is an exploded schematic diagram of the overall structure of the present invention;

[0031] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 4 It is a schematic cross-sectional view of the structure of the present invention;

[0033] Figure 5 Schematic diagram of the structure and position of the spray pipe in the present invention;

[0034] Figure 6 This is a schematic diagram of the structural splicing of the gear set and the crushing knife set in the present invention;

[0035] Figure 7 Schematic diagram of the structural splicing of the reciprocating swing mechanism and the cleaning plate in the present invention;

[0036] Figure 8 It is a partial structural diagram of the reciprocating swing mechanism in the present invention;

[0037] Figure 9 Schematic diagram of the structural splicing of the rack and the plate cleaning mechanism in the present invention;

[0038] Figure 10 Schematic diagram of the structure of the plate cleaning assembly in the present invention;

[0039] Figure 11 This is a schematic diagram of the structural splicing of the screen frame and the waste material box in the present invention;

[0040] Figure 12 Schematic diagram of the structure of the filter box in the present invention;

[0041] Figure 13 This is a schematic diagram of the structural cross-section of the PE artificial wetland in the present invention;

[0042] Figure 14 Schematic diagram of the internal structure of the PE ecological filter in the present invention;

[0043] Figure 15 It is a structural schematic diagram of the water distribution pipe in the present invention.

[0044] In the figure: 100, PE ecological filter; 200, filter residue equipment; 300, PE artificial wetland; 3001, water distribution pipe; 1, filter box; 101, discharge pipe; 102, wheel groove; 103, cover plate; 2, crushing box; 21, gear box; 22, drive motor; 3, feeding hopper; 4, sewage box; 401, discharge pipe; 41, transition box; 42, spray plate; 421, spray pipe; 422, water distribution pipe; 5, crushing knife group; 501, first blade; 502, second blade; 6, gear group; 61, driving gear; 611, first First step pulley; 62, driven gear; 63, synchronous gear; 631, second step pulley; 64, transmission gear; 7, screen frame; 71, filter screen; 8, reciprocating swing mechanism; 801, transmission shaft; 802, incomplete gear plate; 803, rocker arm; 804, gear plate; 805, connecting rod; 9, protective shell; 10, sweeping plate; 11, rack; 12, plate cleaning mechanism; 121, reciprocating screw; 122, spur gear; 123, guide wheel; 124, collecting assembly; 1241, transverse block; 1242, scraper; 1243, collecting baffle. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0046] Example 1

[0047] Reference Figure 1-15 , a domestic sewage treatment system coupled with a biological filter and an artificial wetland, comprising a filter residue device 200, a PE ecological filter 100, and a PE artificial wetland 300 connected in sequence through pipelines, the filter residue device 200 comprises a filter box 1, a crushing box 2 is provided on the filter box 1, a feeding hopper 3 is provided on the crushing box 2, a crushing knife group 5 is provided in the crushing box 2, the crushing knife group 5 comprises a first blade 501 and a second blade 502, the first blade 501 and the second blade 502 are staggered and are used to crush the material fed from the feeding hopper 3 into the crushing box 2, a gear box 21 is provided on the outside of the crushing box 2, a gear group 6 is provided in the gear box 21 for synchronous rotation of the first blade 501 and the second blade 502, a mesh frame 7 is further provided in the filter box 1, a filter screen 71 is provided on the mesh frame 7, the sewage material processed by the crushing knife group 5 will fall on the filter screen 71, and the solid pollutants will remain on the top surface of the filter screen 71 through the filtering effect of the filter screen 71, and the liquid will enter the interior of the filter box 1 through the filter screen 71 and then be discharged through the discharge pipe 101.

[0048] Specifically, the gear set 6 includes a driving gear 61 that drives the first blade 501 to rotate, and a driven gear 62 that drives the second blade 502 to rotate. The driving gear 61 is provided with a first step pulley 611, and the gear box 21 is provided with a synchronous gear 63 that meshes with the first step pulley 611. The synchronous gear 63 is provided with a second step pulley 631. The gear box 21 is also provided with a transmission gear 64 that meshes with the second step pulley 631. The gear box 21 is provided with a driving motor 22 that provides a rotation output for the driving gear 61. The rotation of the output shaft of the driving motor 22 drives the driving gear 61 to rotate, so that the first step pulley 611 also rotates synchronously. The driven gear 62 meshing with the driving gear 61 is synchronously transmitted, and the synchronous gear 63 meshing with the first step pulley 611 rotates synchronously, and the rotation is transmitted to the transmission gear 64 through the second step pulley 631, so that the transmission gear 64 rotates.

[0049] Specifically, a reciprocating swinging mechanism 8 is provided in the crushing box 2, and the reciprocating swinging mechanism 8 includes a transmission shaft 801 connected to the transmission gear 64, and an incomplete toothed disc 802 is provided at the other end of the transmission shaft 801. A rocker arm 803 is provided on the inner side of the crushing box 2, and a gear disc 804 is provided on the rocker arm 803, which is engaged with the incomplete toothed disc 802. The rotation of the transmission gear 64 drives the rotation of the internal components of the reciprocating swinging mechanism 8. Through the cooperation between the incomplete toothed disc 802 and the gear disc 804, the incomplete toothed disc 802 can be intermittently engaged with the two gear discs 804 respectively, so that the incomplete toothed disc 802 can drive the rocker arm 803 to rotate clockwise and counterclockwise, so that the sweeping plate 10 can move in a swinging manner on the surface of the filter screen 71.

[0050] Specifically, a protective shell 9 is provided on the rocker arm 803 to provide protection for the incomplete toothed disc 802 and the gear disc 804. The protective shell 9 is connected to the inner side of the crushing box 2. Through the setting of the protective shell 9, a protective effect can be provided for the meshing matching between the incomplete toothed disc 802 and the gear disc 804.

[0051] Specifically, a connecting rod 805 is provided on the rocker arm 803, and the other end of the connecting rod 805 is connected to a sweeping plate 10 in contact with the surface of the filter screen 71. Through the connecting action of the connecting rod 805, the rocker arm 803 can drive the sweeping plate 10 to swing synchronously when it rotates.

[0052] Specifically, a cleaning mechanism 12 is provided on the sweeping plate 10, a wheel groove 102 is provided on the inner side of the filter box 1, and a rack 11 is provided on the inner side of the filter box 1;

[0053] The plate cleaning mechanism 12 includes a reciprocating screw 121 rotatably connected to the sweeping plate 10, and both ends of the reciprocating screw 121 are provided with a spur gear 122 meshing and matching with the rack 11, and the spur gear 122 is provided with a guide wheel 123 guiding and matching with the wheel groove 102, and the reciprocating screw 121 is provided with an attachment assembly 124. Through the setting of the rack 11, when the sweeping plate 10 swings to a specific position, the spur gear 122 can mesh and match with the rack 11, so that the reciprocating screw 121 can rotate, and the attachment assembly 124 can move horizontally on the reciprocating screw 121, so that the scraper 1242 scrapes off the attachments on the surface of the sweeping plate 10.

[0054] Specifically, the attachment collection component 124 includes a transverse block 1241 that is rotatably assembled with the reciprocating screw 121. Scrapers 1242 are provided on both sides of the transverse block 1241. The scrapers 1242 are provided with collection baffles 1243. Through the setting of the collection baffles 1243, after the scraper 1242 scrapes off the attachments on the surface of the sweeping plate 10, the collection baffles 1243 will push the attachments to move, concentrate the attachments, and facilitate subsequent stripping and cleaning operations.

[0055] Specifically, a cover plate 103 is provided on the outside of the filter box 1 to provide sealing for the wheel groove 102. The outside of the filter box 1 is connected to a discharge pipe 101. The setting of the wheel groove 102 provides a guide for the guide wheel 123, which provides a guide for the swinging movement of the sweeping plate 10.

[0056] Example 2

[0057] Reference Figure 1-15 The difference between this embodiment and embodiment 1 is that a sewage box 4 is provided on both sides of the filter box 1, and the sewage box 4 is connected to a sewage pipe 401. The sewage box 4 is also provided with a transition box 41, and the transition box 41 is provided with a spray plate 42. The setting of the transition box 41 can allow the pollutants removed from the surface of the sweeping plate 10 by the cleaning mechanism 12 to enter the interior of the sewage box 4 and then be discharged through the sewage pipe 401.

[0058] Specifically, the side of the spray plate 42 located on the inner side of the transition box 41 is connected to the spray pipe 421, and the side of the spray plate 42 located on the outer side of the transition box 41 is provided with a water distribution pipe 422 connected to the spray pipe 421. Through the connection between the external water supply pipe and the water distribution pipe 422, the spray pipe 421 can spray water on the surface of the sweeping plate 10 when the sweeping plate 10 swings close to the transition box 41, so as to clean the pollutants on the surface of the sweeping plate 10 and the pollutants on the scraper 1242, so that the pollutants can enter the interior of the sewage box 4 through the transition box 41.

[0059] For other structures not described, refer to Example 1.

[0060] Example 3

[0061] Reference Figure 1 、 Figure 13 and Figure 15 The difference between this embodiment and embodiment 1 is that the PE artificial wetland 300 is a subsurface artificial wetland, in which a stone layer, a gravel layer, and a vegetation planting layer are respectively arranged from bottom to top. A water distribution pipe 3001 is laid in the stone layer. The sewage flowing out of the PE ecological filter 100 flows evenly into the PE artificial wetland 300 through the water distribution pipe 3001, is filtered by the stone layer, filtered and intercepted by the gravel layer, and the microorganisms and plant roots in the vegetation planting layer cooperate to degrade organic matter. The biological synergistic denitrification and phosphorus removal processes ultimately achieve the purpose of effectively removing pollutants.

[0062] For other structures not described, refer to Example 1.

[0063] Example 4

[0064] Reference Figure 1 and Figure 14 The difference between this embodiment and embodiment 1 is that the PE ecological filter 100 is divided into three chambers from left to right. The left chamber is a sedimentation tank for receiving domestic sewage treated by the filter residue equipment 200, and at the same time precipitating insoluble matter and suspended matter in the domestic sewage. The precipitated organic matter can undergo microbial anaerobic fermentation in the sedimentation tank. The upper clear liquid after precipitation enters the middle chamber, which is an anaerobic membrane bioreactor. Spherical multi-fibrous fillers are suspended in the chamber. Microorganisms attach to the fillers to perform anaerobically decomposition and treat COD in the sewage, and perform sewage denitrification and denitrification processes. The right chamber is a clear water tank for effluent suspended matter precipitation and effluent regulation. A partition is provided in the sedimentation tank to increase the length of the sewage circulation path and improve the sedimentation effect. A partition is provided in the anaerobic membrane bioreactor to allow the sewage to fully contact the fillers in the tank. A partition is provided in the clear water tank to increase the flow path length of the water flow and improve the treatment effect.

[0065] For other structures not described, refer to Example 1.

[0066] Working Principle: In the present invention, first, sewage containing pollutants is introduced into the crushing box 2 from the feeding hopper 3. By turning on the drive motor 22, the internal components of the gear set 6 are driven to rotate, so that the first blade 501 and the second blade 502 can rotate synchronously in opposite directions to crush the pollutants in the sewage. After crushing, the pollutants fall on the top surface of the filter screen 71. The filtering effect of the filter screen 71 allows the particulate pollutants to remain on the top surface of the filter screen 71, allowing the sewage to enter the interior of the filter box 1 for collection and discharge through the discharge pipe 101 for subsequent treatment;

[0067] When particulate pollutants are concentrated on the top surface of the filter screen 71, the power input of the drive motor 22 is synchronously used to drive the transmission gear 64 to drive the internal components of the reciprocating swing mechanism 8 to rotate, so that the swing rod 803 can drive the sweeping plate 10 to swing back and forth on the top surface of the filter screen 71 through the connecting rod 805, so that the sweeping plate 10 scrapes the pollutants on the top surface of the filter screen 71 to avoid clogging of the filter screen 71 and affecting its filtering effect. When the sweeping plate 10 swings back and forth, the spur gear 122 is engaged with the rack 11 to make the reciprocating screw 121 rotate, and the transverse block 1241 can move the reciprocating screw 121 back and forth. 21 is moved back and forth horizontally, so that the scraper 1242 can centrally scrape off the attachments on the surface of the sweeping plate 10, and cooperate with the collection baffle 1243 to centrally treat the scraped pollutants. When the sweeping plate 10 drives the scraper 1242 to swing close to the transition box 41, the spray pipe 421 can be started, and the spray pipe 421 sprays the surface of the sweeping plate 10 and the surface of the scraper 1242, so that the surface pollutants of both can fall into the interior of the sewage box 4 under the action of gravity and be collected, and then discharged from the sewage pipe 401 and processed in turn through the PE ecological filter (100) and the PE artificial wetland (300).

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In the present invention, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0070] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by a person skilled in the art. The provision of power is also common knowledge in the art. The present invention is mainly used to protect mechanical devices, so the control method and circuit connection are not explained in detail in the present invention.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A domestic sewage treatment system coupled with a biological filter and an artificial wetland, comprising a filter residue device (200), a PE ecological filter (100), and a PE artificial wetland (300) connected in sequence through a pipeline, characterized in that: The filter residue equipment (200) comprises a filter box (1), a crushing box (2) is provided on the filter box (1), a feeding hopper (3) is provided on the crushing box (2), a crushing knife group (5) is provided in the crushing box (2), a mesh frame (7) is provided in the filter box (1), and a filter screen (71) is provided on the mesh frame (7); A reciprocating swing mechanism (8) is provided in the crushing box (2), the reciprocating swing mechanism (8) comprising a transmission shaft (801) connected to a transmission gear (64), an incomplete toothed disc (802) being provided at the other end of the transmission shaft (801), a swing rod (803) being provided on the inner side of the crushing box (2), and a gear disc (804) being provided on the swing rod (803) and meshing with the incomplete toothed disc (802); The swing rod (803) is provided with a connecting rod (805), and the other end of the connecting rod (805) is connected to a sweeping plate (10) in contact with the surface of the filter screen (71); The sweeping plate (10) is provided with a plate cleaning mechanism (12), the inner side surface of the filter box (1) is provided with a wheel groove (102), and the inner side surface of the filter box (1) is provided with a rack (11); The plate cleaning mechanism (12) comprises a reciprocating screw (121) rotatably connected to the sweeping plate (10), spur gears (122) meshing with the rack (11) are provided at both ends of the reciprocating screw (121), a guide wheel (123) guided and matched with the wheel groove (102) is provided on the spur gear (122), and an attachment assembly (124) is provided on the reciprocating screw (121).

2. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 1, characterized in that: The PE artificial wetland (300) is a subsurface artificial wetland, which comprises a stone layer, a gravel layer, and a vegetation layer from bottom to top, and a water distribution pipe (3001) connected to the PE ecological filter (100) is laid in the stone layer.

3. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 1, characterized in that: The PE ecological filter (100) is divided into three sequentially connected chambers from left to right, the left chamber is a sedimentation tank, the middle chamber is an anaerobic membrane bioreactor tank, and the right chamber is a clear water tank.

4. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 1, characterized in that: The crushing blade group (5) comprises a first blade (501) and a second blade (502). A gear box (21) is provided outside the crushing box (2), and a gear group (6) for synchronously rotating the first blade (501) and the second blade (502) is provided inside the gear box (21).

5. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 4, characterized in that: The gear set (6) comprises a driving gear (61) for driving the first blade (501) to rotate, and a driven gear (62) for driving the second blade (502) to rotate, the driving gear (61) being provided with a first step pulley (611), a synchronous gear (63) meshing with the first step pulley (611) being provided in the gear box (21), a second step pulley (631) being provided on the synchronous gear (63), and a transmission gear (64) meshing with the second step pulley (631) being provided in the gear box (21).

6. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 1, characterized in that: The swing arm (803) is provided with a protective shell (9) for protecting the incomplete toothed disc (802) and the gear disc (804), and the protective shell (9) is connected to the inner side surface of the crushing box (2).

7. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 1, characterized in that: The collecting assembly (124) comprises a transverse moving block (1241) rotatably mounted on the reciprocating screw (121), with scrapers (1242) provided on both sides of the transverse moving block (1241), and a material collecting baffle (1243) provided on the scraper (1242).

8. The domestic sewage treatment system of a biofilter coupled with an artificial wetland according to claim 1, characterized in that: The outside of the filter box (1) is provided with a cover plate (103) for providing sealing for the wheel groove (102), and the outside of the filter box (1) is connected to a discharge pipe (101).

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