A biological-ecological coupled low-carbon rural domestic sewage treatment system

Abstract

The application discloses the technical field of sewage treatment equipment, and particularly relates to a biological-ecological coupling low-carbon rural domestic sewage treatment system, which comprises a pretreatment unit and a biological treatment unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment equipment, and particularly relates to a biological-ecological coupling low-carbon rural domestic sewage treatment system. BACKGROUND

[0002] The sewage generated in the life process of rural residents is the main source of rural sewage, and the content of organic matter, nitrogen and phosphorus is high, and the biochemical property is generally good. Since the sewage is small in quantity, scattered and far away from the sewage pipe network, it is generally directly discharged into rivers and lakes without any treatment, which is a major hidden danger of water pollution.

[0003] According to the search, the patent with the application number 201811352563.1 discloses a high-standard discharge requirement rural sewage biological-ecological coupling treatment method, which is performed according to the following steps: the construction of the integrated equipment selects different structures according to different water quantities, and the construction method of the ecological ditch is adopted for the steel slag and the ecological ditch.

[0004] The existing equipment has high investment and operation cost, and the operation is complex, so it is difficult to popularize and apply in rural areas. Therefore, it is particularly important to develop a biological-ecological coupling sewage treatment process with low investment, low operation cost and simple operation for the treatment of rural domestic sewage. The rural sewage contains many impurities, and if the hard iron, plastic and cloth are not removed before treatment, the pipeline will be easily blocked, which increases the cost of equipment maintenance, and it is difficult to meet the use requirements of people. SUMMARY

[0005] The present application relates to the technical field of sewage treatment equipment, and particularly relates to a biological-ecological coupling low-carbon rural domestic sewage treatment system.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] The utility model provides a kind of biological ecological coupling low-carbon rural domestic sewage treatment system, including pretreatment unit and biological treatment unit, the pretreatment unit input end is connected with sewage total network pipe, pretreatment unit one side is equipped with regulating tank, regulating tank input end and pretreatment unit output end through connection have sewage guide pipe one, the regulating tank rear side is provided with mounting table, mounting table top is equipped with lifting pump by screw, lifting pump input end is connected on regulating tank bottom end side wall, between the lifting pump output end and biological treatment unit input end through connection has sewage guide pipe two, biological treatment unit one side is equipped with regulating tank, regulating tank input end and biological treatment unit output end between through connection has sewage guide pipe three, regulating tank output end is fixed with drain pipe, the biological treatment unit other side is also equipped with solar panel assembly, solar panel assembly lower end is equipped with electric control box, electric control box is equipped with energy storage and control piece in, and solar panel assembly electric energy output end is connected with the energy storage in electric control box.

[0008] Preferably, the pretreatment unit includes a rejection work tank, a deflector is fixed to the inner wall of the upper side of the rejection work tank, a magnetic conveyor belt for adsorbing iron debris in rural sewage is installed on the upper end of the deflector, an output disc is provided on the side away from the sewage total network pipe at the lower end of the magnetic conveyor belt, a scraping strip is provided on the upper side of the output disc, one end of the scraping strip is in close contact with the belt surface of the magnetic conveyor belt, a spiral knife set is also provided on the side of the deflector close to the output disc, a placement disc is also fixed to the rear end of the middle of the rejection work tank, a collection cylinder is placed on the inner side of the top end of the placement disc, one end of the output disc extends to the upper side of the collection cylinder through the rejection work tank, a backflow hopper is also fixed to the inner wall of the middle of the rejection work tank, two screening rollers are installed on the lower side of the backflow hopper, a plurality of puncture needles are fixed to the outer side of each screening roller in a matrix shape, a discharge dish is provided on the lower end of each screening roller close to one end of the inner wall of the rejection work tank, a material lifting rod is fixed to the top side of the discharge dish, a collection dish is placed on the lower side of the discharge dish, and a driving assembly is also installed on the rear side of the rejection work tank for driving the magnetic conveyor belt, the spiral knife set, and the transmission of the screening rollers.

[0009] Preferably, the deflector is fixed to the side wall close to the sewage total network pipe, and the deflector is attached to the inner wall of the rejection work tank on the front and back sides, the deflector is inclined downward from the input end side to the output end side, the belt pulley of the magnetic conveyor belt has three, the three belt pulleys are arranged in a triangular shape, the acute angle between the magnetic conveyor belt body close to the deflector side and the deflector is 5 degrees, the closest distance between the belt surface body of the magnetic conveyor belt and the deflector is 75 mm, the scraping strip is arranged on the upper side of the inner end of the output disc, and the bottom surface of the output disc is inclined downward from the magnetic conveyor belt side to the placement disc side.

[0010] Preferably, the driving assembly comprises a driving box body fixed on the rear side wall of the removing work box, a driving motor is fixed on the inner bottom surface of the lower side of the driving box body through screws, the output end of the driving motor is fixed with one of the screening rollers, the rear sides of the two screening rollers are rotationally connected through a gear set, the driving end of the driving magnetic conveying belt and the rear side of the spiral knife set are rotationally connected through a synchronous conveying chain, and the driving end of the driving magnetic conveying belt is also rotationally connected with the synchronous conveying chain two between the two.

[0011] Preferably, the material picking rods are evenly fixed in a row at the top end position of the material discharging dish, and the material picking rods are arranged in a J shape and extend to the inside of the puncture needle.

[0012] Preferably, the biological treatment unit comprises a pre-aeration tank, a sedimentation tank, an aerobic tank, an anaerobic tank and a second anoxic tank, the biological treatment unit adopts a '' back '' shape structure, sewage between adjacent tanks is connected through a pipeline, the pre-aeration tank is used for realizing reflux mixing and integrated equipment stirring, reflux pumps are installed in the aerobic tank, the third anoxic tank and the sedimentation tank to realize sludge reflux, and a sludge pump is further arranged in the sedimentation tank to discharge sludge.

[0013] Preferably, the biological treatment unit is different in that a first anoxic tank is additionally arranged before treatment, so as to play a role of pre-denitrification of reflux sludge.

[0014] Preferably, the biological treatment unit is different in that a third anoxic tank is additionally arranged after treatment, so as to guarantee effluent by using the sludge-water separation effect of the sedimentation tank.

[0015] Compared with the prior art, the present application provides a biological ecological coupling low-carbon rural domestic sewage treatment system, which has the following beneficial effects:

[0016] 1. The present application has low operating cost and simple operation, is suitable for popularization and application in rural areas, and removes hard iron, plastic and cloth before sewage, so that the risk of pipeline blockage during sewage treatment is greatly reduced, the cost of equipment maintenance is reduced, and the construction requirements of modern beautiful countryside are met.

[0017] 2. The present application is provided with an aerator in the adjusting tank for pre-aeration to prevent suspended matter from depositing, and a lifting pump is used to distribute rural domestic sewage to the biological treatment unit equipment in a point-by-point water inlet mode, the biological treatment unit adopts a '' back '' shape structure, can be operated in a double-mode process, saves pipeline cost and reflux time, forms an alternating multi-stage anaerobic / anoxic / aerobic environment, strengthens the biological denitrification and phosphorus removal effect, and the pre-aeration tank is arranged in the biological treatment unit, biological sludge is added, biological flocculation is generated, and the purification effect is strengthened.

[0018] 3、The solar cell panel assembly can utilize the solar panel to absorb sunlight and convert into electric energy, store the electric energy into the electric control box, ensure the normal operation of the biological treatment unit and the aeration equipment, and achieve low carbonization of sewage treatment;

[0019] 4、When the application is used, the domestic sewage generated by farmers can be collected through the sewage total network pipe, treated by the biological treatment unit, the regulating and storage tank, the ecological ditch and the artificial wetland, and discharged after reaching the water quality standard, so that the sewage can be used for planting aquatic vegetables and breeding aquatic animals in the aquatic pond, and the resource utilization is achieved;

[0020] 5、When the application is used, the magnetic impurities in the sewage are removed through the magnetic conveyor belt, the large impurities are crushed through the spiral knife group after treatment, then the plastic and cloth are pierced on the piercing needle through the reverse rotation of the two screening rollers, and when the screening rollers continue to rotate, the plastic and cloth are picked down by the picking rod and fall into the collection dish through the discharge dish, so that the magnetic impurities, plastic and cloth in the sewage are completely removed, and the risk of pipeline blockage and equipment damage during sewage treatment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the application;

[0022] Figure 2 It is a structural diagram of the biological treatment unit in the application;

[0023] Figure 3 It is a front view of the pretreatment unit in the application;

[0024] Figure 4 It is an enlarged view of A in the application; Figure 3

[0025] Figure 5 It is a side view of the pretreatment unit in the application;

[0026] Figure 6 It is a flow chart of the ecological coupling low-carbon rural domestic sewage treatment system in the application;

[0027] Figure 7 It is a system flow chart of example six in the application;

[0028] Figure 8 It is a system flow chart of example seven in the application.

[0029] ​In the figure: pretreatment unit 1, biological treatment unit 2, sewage total network pipe 3, adjusting tank 4, sewage conduit one 5, installation platform 6, lifting pump 7, sewage conduit two 8, regulating and storage tank 9, sewage conduit three 10, drain pipe 11, solar cell panel assembly 12, electric control box 13, rejection work box 101, flow guide plate 102, magnetic conveying belt 103, output disc 104, scraping strip 105, spiral knife group 106, placement disc 107, collection cylinder 108, backflow hopper 109, screening roller 1010, puncture needle 1011, discharge dish 1012, material picking rod 1013, collection dish 1014, drive box body 1015, drive motor 1016, first anoxic tank 21, third anoxic tank 22, pre-aeration tank 23, sedimentation tank 24, aerobic tank 25, anaerobic tank 26, second anoxic tank 27. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] Embodiment one

[0033] Reference Figures 1-5The utility model provides a kind of biological ecological coupling low-carbon rural domestic sewage treatment system, including pretreatment unit 1 and biological treatment unit 2, pretreatment unit 1 input end is connected with sewage total network pipe 3, pretreatment unit 1 side is equipped with adjusting tank 4, adjusting tank 4 is equipped with aerator, adjusting tank 4 input end and pretreatment unit 1 output end are connected with sewage conduit one 5, adjusting tank 4 rear side is provided with mounting table 6, mounting table 6 top surface is equipped with lifting pump 7 by screw, lifting pump 7 input end is connected on adjusting tank 4 bottom end side wall, lifting pump 7 output end and biological treatment unit 2 input end are connected with sewage conduit two 8, biological treatment unit 2 side is equipped with regulating tank 9, regulating tank 9 output end is connected with ecological treatment unit, regulating tank 9 input end and biological treatment unit 2 output end are connected with sewage conduit three 10, regulating tank 9 output end is fixed with drain pipe 11, biological treatment unit 2 other side is also equipped with solar cell panel assembly 12, solar cell panel assembly 12 lower end is equipped with electric control box 13, electric control box 13 is equipped with energy storage and control part, solar cell panel assembly 12 electric energy output end is connected with the energy storage in electric control box 13, solar cell panel assembly 12 can utilize solar panel to absorb sunlight and convert into electric energy, store electric energy into electric control box 13, guarantee the normal operation of biological treatment unit 2 and aeration equipment, reach sewage treatment low carbonization, set aerator in adjusting tank 4, carry out pre-aeration, prevent suspended solids deposition, rural domestic sewage is distributed to biological treatment unit 2 equipment by lifting pump 7 using point water inlet mode, biological treatment unit adopts the structure of '' back '' character, can carry out double mode process operation, save pipeline cost and reflux time, so that it forms alternating multistage anaerobic / anoxic / aerobic environment, strengthens biological denitrification and phosphorus removal effect, pre-aeration tank is arranged in biological treatment unit, adds biological sludge, produces biological flocculation, strengthens purification effect.

[0034] Example two

[0035] As Figure 1 、 3As shown in Figure 5, the embodiment is basically the same as that of Embodiment 1, preferably, the pretreatment unit 1 comprises a rejection work tank 101, a deflector 102 is fixed to the inner wall of the upper side of the rejection work tank 101, a magnetic conveyor belt 103 for adsorbing iron debris in rural sewage is installed at the upper end of the deflector 102, an output disc 104 is arranged at the lower end of the magnetic conveyor belt 103 away from the side of the sewage main pipe 3, a scraping strip 105 is arranged on the upper side of the output disc 104, one end of the scraping strip 105 is in close contact with the belt surface of the magnetic conveyor belt 103, a spiral knife set 106 is arranged on the side of the deflector 102 close to the output disc 104, a placement disc 107 is further fixed to the rear end of the middle part of the rejection work tank 101, a collection cylinder 108 is placed on the top end of the inner side of the placement disc 107, one end of the output disc 104 penetrates through the rejection work tank 101 and extends to the upper side of the collection cylinder 108, a backflow hopper 109 is further fixed to the inner wall of the middle part of the rejection work tank 101, two screening rollers 1010 are installed at the lower side of the backflow hopper 109, a plurality of puncture needles 1011 are fixed in a matrix shape on the outer side of each of the screening rollers 1010, a discharge dish 1012 is arranged at the lower end of each of the screening rollers 1010 close to the inner side wall of the rejection work tank 101, a material picking rod 1013 is fixed to the top side of the discharge dish 1012, a collection dish 1014 is placed under the discharge dish 1012, a driving assembly for driving the magnetic conveyor belt 103, the spiral knife set 106 and the screening rollers 1010 is further installed on the rear side of the rejection work tank 101, the material picking rod 1013 is arranged in a plurality of rows and uniformly fixed at the top end position of the discharge dish 1012, and the material picking rod 1013 is arranged in a "J" shape and extends to the inner side of the puncture needle 1011.

[0036] In this embodiment, the magnetic debris in the sewage is removed by the magnetic conveyor belt 103 during use, the large debris is broken by the spiral knife set 106 after treatment, and then the plastic and cloth are punctured on the puncture needle 1011 by the reverse rotation of the two screening rollers 1010, when the screening rollers 1010 continue to rotate, the plastic and cloth are picked down by the material picking rod 1013 and fall from the discharge dish 1012 into the collection dish 1014, so that the magnetic debris, plastic and cloth in the sewage are completely removed, and the risk of pipe blockage and equipment damage by impact during sewage treatment is reduced.

[0037] Embodiment Three

[0038] As Figures 3-5As shown, this embodiment is basically the same as embodiment 1. Preferably, the guide plate 102 is fixed on the side wall near the main sewage network pipe 3, and the front and rear sides of the guide plate 102 are in contact with the inner wall of the removal work box 101. The guide plate 102 is inclined downward from the input end to the output end. The magnetic conveyor belt 103 has three pulleys arranged in a triangular shape. The acute angle between the magnetic conveyor belt 103 body and the guide plate 102 on the side near the guide plate 102 is 5 degrees. The closest distance between the magnetic conveyor belt 103 body and the guide plate 102 is 75mm, which facilitates the discharge of sewage and the complete adsorption of magnetic objects. The scraper 105 is set on the upper side of the inner end of the output plate 104. The bottom surface of the output plate 104 is inclined downward from the magnetic conveyor belt 103 side to the placement plate 107 side, which facilitates the discharge of debris.

[0039] Example 4

[0040] like Figure 1 , 3 As shown in Figure 5, this embodiment is basically the same as embodiment 1. Preferably, the driving assembly includes a driving housing 1015 fixed on the rear side wall of the rejection work box 101. A driving motor 1016 is fixed to the lower inner bottom surface of the driving housing 1015 by screws. The output end of the driving motor 1016 is fixed to one of the screening rollers 1010. The rear sides of the two screening rollers 1010 are rotatably connected by a gear set. The transmission end of the driving magnetic conveyor belt 103 and the rear side of the spiral blade assembly 106 are rotatably connected by a synchronous transmission chain one. The transmission end of the driving magnetic conveyor belt 103 is also rotatably connected to one of the screening rollers 1010 by a synchronous transmission chain two.

[0041] In this embodiment, a single drive motor 1016 can achieve synchronous driving of the screening roller 1010, the magnetic conveyor belt 103, and the spiral blade assembly 106, thereby facilitating the coordinated operation of the control device and greatly saving the manufacturing cost of the equipment.

[0042] Example 5

[0043] like Figure 1 and 6 As shown, this embodiment is basically the same as embodiment 1. Preferably, the biological treatment unit 2 includes a pre-aeration tank 23, a sedimentation tank 24, an aerobic tank 25, an anaerobic tank 26, and a second anoxic tank 27. The biological treatment unit 2 adopts a "U"-shaped structure, and the sewage between adjacent tanks is connected by pipes. The pre-aeration tank 23 is used to realize reflux mixing and integrated equipment stirring. The aerobic tank 25, the third anoxic tank 22, and the sedimentation tank 24 are all equipped with reflux pumps to realize sludge reflux. The sedimentation tank 24 is also equipped with a sludge pump to discharge sludge. The ecological treatment unit includes a storage tank, an ecological ditch, a surface flow artificial wetland, and an aquatic organism pond.

[0044] In this embodiment, rural domestic sewage enters the regulating tank 4 through the sewage pipe network, and after being lifted by the booster pump 7, it enters the biological treatment unit 2. The rural domestic sewage treated by the biological treatment unit 2 enters the storage tank 9 through the sewage conduit 10. Ecological treatment is carried out in the regulating tank, and aquatic plants are planted. After regulation by the storage tank 9, the sewage enters the ecological treatment unit such as the ecological ditch. The ecological treatment unit effectively captures nutrients such as nitrogen and phosphorus in the sewage and achieves further fine treatment to achieve the dual goals of water purification and resource utilization. If the water quality of the aquatic biological pond does not meet the standards, it can be transported to the storage tank through the pipeline for recycling treatment.

[0045] Example 6

[0046] like Figure 7 As shown, this embodiment is basically the same as embodiment 1. Preferably, the difference of biological treatment unit 2 is that a first anoxic tank 21 is added before sewage treatment to play a role in the pre-denitrification of sludge.

[0047] In this embodiment, a pre-anoxic tank is added before wastewater treatment, which can serve as a pre-denitrification tank for returned sludge. The specific process is as follows: wastewater enters the regulating tank 4 through the pipeline network, is lifted by the booster pump 7, and then enters the biological treatment unit 2. Wastewater and returned sludge are mixed together and enter the first anoxic tank 21 for denitrification. The effluent flows by gravity into the anaerobic tank 26, and then flows by gravity into the second anoxic tank 27 to enhance the denitrification efficiency. The effluent then flows by gravity into the aerobic tank 25 for nitrification, and then flows by gravity into the pre-aeration tank 23. Biological sludge is added during aeration to produce bioflocculation, thereby improving the separation efficiency of the sedimentation tank. The effluent then flows by gravity into the sedimentation tank 24 for sludge-water separation, removing most of the suspended solids in the wastewater. Part of the sludge in the sedimentation tank 24 is returned to the aerobic tank 25, so that the sedimentation tank can enhance the biological purification effect while removing turbidity. Wastewater can also be directly fed into the anaerobic tank 9 for denitrification. The effluent flows by gravity into the second anoxic tank 27. Part of the sludge in the sedimentation tank 24 can be returned to the front end of the aerobic tank 25. The remaining sludge is discharged to the sludge storage tank and dewatered regularly by a mobile sludge dewatering truck for disposal. The mixed liquor in the aerobic tank 25 is returned to the first anoxic tank 21 and the second anoxic tank 27 respectively. The sludge is first returned to the first anoxic tank 21 to undergo denitrification and nitrogen removal, and then enters the second anoxic tank 27 through the anaerobic tank 26. This avoids the interference of nitrate and DO in the returned sludge on anaerobic phosphorus release.

[0048] Example 7

[0049] like Figure 8 As shown, this embodiment is basically the same as embodiment 1. Preferably, the difference of biological treatment unit 2 is that a third anoxic tank 22 is added after treatment, and the mud-water separation effect of sedimentation tank 24 is used to ensure the effluent.

[0050] In the embodiment, the specific process is as follows: the sewage enters the adjusting tank 4 through the pipe network, is lifted by the lifting pump 7, and then enters the biological treatment unit 2; the sewage and the backflow sludge enter the anaerobic tank 26 to perform denitrification; the effluent flows into the second anoxic tank 27; the effluent flows into the aerobic tank 25 to perform nitrification; the effluent flows into the third anoxic tank 22; the effluent flows into the pre-aeration tank 23; finally, the effluent flows into the sedimentation tank 24 to perform sludge-water separation; the mixed liquid of the aerobic tank 25 flows back to the second anoxic tank 27; the mixed liquid of the sedimentation tank 24 flows back to the front end of the aerobic tank 25; and the mixed liquid of the third anoxic tank 22 flows back to the anaerobic tank 26.

[0051] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical solution and the inventive concept of the present application, can make equivalent replacements or changes within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A low-carbon rural domestic sewage treatment system with biological-ecological coupling, comprising a pretreatment unit (1) and a biological treatment unit (2), characterized in that, The input end of the pretreatment unit (1) is connected to the main sewage network pipe (3). A regulating tank (4) is provided on one side of the pretreatment unit (1). A sewage conduit (5) is connected through the input end of the regulating tank (4) to the output end of the pretreatment unit (1). An installation platform (6) is provided on the rear side of the regulating tank (4). A lift pump (7) is installed on the top surface of the installation platform (6) by screws. The input end of the lift pump (7) is connected to the bottom side wall of the regulating tank (4). The output end of the booster pump (7) is connected to the input end of the biological treatment unit (2) by a sewage conduit (8). A storage tank (9) is installed on one side of the biological treatment unit (2). A sewage conduit (3) is connected to the input end of the storage tank (9) and the output end of the biological treatment unit (2) by a sewage conduit (10). A drain pipe (11) is fixed at the output end of the storage tank (9). On the other side of the biological treatment unit (2), a solar panel assembly (12) is also installed. An electrical control box (13) is provided at the lower end of the solar panel assembly (12). An energy storage device and a control device are installed inside the electrical control box (13). The power output end of the solar panel assembly (12) is connected to the energy storage device inside the electrical control box (13). The pretreatment unit (1) includes a removal work box (101). A guide plate (102) is fixed on the upper inner wall of the removal work box (101). A magnetic conveyor belt (103) for adsorbing iron debris in rural sewage is installed on the upper end of the guide plate (102). An output plate (104) is provided on the side of the lower end of the magnetic conveyor belt (103) away from the main sewage network pipe (3). A scraper (105) is provided on the upper side of the output plate (104). One end of the scraper (105) is in close contact with the belt surface of the magnetic conveyor belt (103). A spiral blade assembly (106) is also provided on the side of the guide plate (102) near the output plate (104). A placement plate (107) is also fixed in the middle of the rear end of the removal work box (101). A collection cylinder (108) is placed on the inner side of the top of the placement plate (107). The output plate (104) One end passes through the rejection work box (101) and extends to the upper side of the collection cylinder (108). The inner wall of the middle part of the rejection work box (101) is also fixed with a backflow bucket (109). Two screening rollers (1010) are installed on the lower side of the backflow bucket (109). Multiple piercing needles (1011) are fixed in a matrix on the outer side of the screening rollers (1010). A discharge dish (1012) is provided at the lower end of the screening rollers (1010) near the inner side wall of the rejection work box (101). A picking rod (1013) is fixed on the top side of the discharge dish (1012). A collection dish (1014) is placed on the lower side of the discharge dish (1012). A drive assembly for driving the magnetic conveyor belt (103), the spiral blade group (106) and the screening rollers (1010) is also installed on the rear side of the rejection work box (101). The pulley of the magnetic conveyor belt (103) is provided with three, and the three pulleys are arranged in a triangular shape. The acute angle formed between the body of the magnetic conveyor belt (103) near the deflector (102) and the deflector (102) is 5 degrees, and the shortest distance between the surface body of the magnetic conveyor belt (103) and the deflector (102) is 75 mm, which is convenient for sewage drainage and ensures that magnetic objects can be completely adsorbed.

2. The low-carbon rural domestic sewage treatment system with biological-ecological coupling according to claim 1, characterized in that, The deflector (102) is fixed on the side wall of the main sewage pipe network (3), and the front and rear sides of the deflector (102) are fitted with the inner wall of the rejection work box (101). The deflector (102) is inclined downward from the input end side to the output end side.

3. A low-carbon rural domestic sewage treatment system with biological-ecological coupling as described in claim 1 or 2, characterized in that, The scraping bar (105) is arranged on the upper side of the inner end of the output disk (104), and the bottom surface of the output disk (104) is inclined downward from the side of the magnetic conveyor belt (103) to the side of the placement disk (107).

4. The low-carbon rural domestic sewage treatment system with biological-ecological coupling according to claim 1, characterized in that, The driving component includes a driving box body (1015) fixed on the rear side wall of the rejection work box (101). A driving motor (1016) is fixed on the inner bottom surface of the lower side of the driving box body (1015) by screws. The output end of the driving motor (1016) is fixed to one of the screening rollers (1010). The rear sides of the two screening rollers (1010) are rotationally connected through a gear set. The driving end of the magnetic conveyor belt (103) and the rear side of the spiral knife group (106) are rotationally connected through a synchronous transmission chain one. There is also a synchronous transmission chain two rotatably connected between the driving end of the magnetic conveyor belt (103) and one of the screening rollers (1010).

5. A low-carbon rural domestic sewage treatment system with biological-ecological coupling according to claim 1, characterized in that, A plurality of material picking rods (1013) are uniformly fixed at the top position of the discharging dish (1012) in a row, and the material picking rods (1013) are arranged in a "J" shape and extend to the inside of the puncture needle (1011).

6. A low-carbon rural domestic sewage treatment system with biological-ecological coupling according to claim 1, characterized in that, The biological treatment unit (2) includes a pre-aeration tank (23), a sedimentation tank (24), an aerobic tank (25), an anaerobic tank (26), and a second anoxic tank (27). The biological treatment unit (2) adopts a "return" shape structure, and the sewage between adjacent tanks is connected through pipelines. The pre-aeration tank (23) is used to achieve reflux mixing and agitation of the integrated equipment. Return pumps are installed in the aerobic tank (25), the third anoxic tank (22), and the sedimentation tank (24) to achieve sludge reflux. A sludge pump is also provided in the sedimentation tank (24) to discharge sludge.

7. A low-carbon rural domestic sewage treatment system with biological-ecological coupling according to claim 6, characterized in that, The difference of the biological treatment unit (2) is that a first anoxic tank (21) is added before treatment to play a role in pre-denitrification of reflux sludge.

8. A low-carbon rural domestic sewage treatment system with biological-ecological coupling according to claim 1, characterized in that, The difference of the biological treatment unit (2) is that a third anoxic tank (22) is added after treatment to ensure the effluent quality by utilizing the sedimentation effect of the sedimentation tank (24).

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