Domestic sewage recycling system

Abstract

The invention relates to the technical field of sewage treatment, in particular to a domestic sewage recycling system which comprises a house, a sewage source is arranged in the house, a sewage pipe is arranged on one side of the sewage source, the side where the sewage pipe is located is defined as the right side, the domestic sewage recycling system further comprises a septic tank treatment device, and a plurality of settling tanks are arranged in the septic tank treatment device and used for settling and filtering sewage; the biological treatment device is sequentially provided with a water distribution tank, an anaerobic tank, an aerobic tank, a facultative anaerobic tank and a sewage collection tank from left to right, and is used for decomposing sewage by utilizing microorganisms; the subsurface flow wetland treatment device comprises a plurality of constructed wetlands with certain height difference so as to ecologically purify sewage through the wetlands; the biological pond treatment device comprises an ecological pond, and various water purification plants are arranged in the ecological pond so as to purify a water body through the plants; according to the system, four-stage purification of the domestic sewage is realized, the purification efficiency and the treatment effect of the domestic sewage are remarkably improved, meanwhile, the utilization efficiency of water resources is improved, and waste of the water resources is avoided.

Description

Technical Field

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

[0002] Domestic sewage is mainly wastewater discharged from residents' daily lives. Pollutants are mainly organic matter and pathogens. It is rich in nitrogen and phosphorus and does not contain heavy metals. With the development of society, the urban sewage system has become more and more perfect. Collecting domestic sewage through pipes and then treating it centrally is an important treatment mode in cities. However, rural areas and suburban green parks, mountainous areas and other places are remote and cannot be connected to the urban sewage treatment network. There are certain difficulties in the treatment of domestic sewage.

[0003] A Chinese patent application with application publication number CN106966546A discloses a rural domestic sewage treatment device, which includes a filter tank, an anaerobic tank, an aeration tank and a culture tank. Rural domestic sewage enters the filter tank from the water inlet above the filter tank, enters the anaerobic tank through the filter plate at the bottom of the filter tank after primary filtration, and the anaerobically treated sewage in the anaerobic tank enters the aeration tank through a connecting pipe through a pump. The aerated sewage is transferred to the culture tank by a pump to cultivate plants, and then the water in the culture tank is pumped out by a water outlet pump. The pumped water can be discharged if it meets the discharge standard of secondary domestic sewage, otherwise it will be returned for reprocessing.

[0004] The above-mentioned sewage treatment device has certain defects: 1. The above-mentioned sewage treatment device only performs two-stage purification treatment on sewage, and the treatment process is relatively small, resulting in poor sewage treatment effect when the device is in use. The sewage still needs to be returned for treatment, and the sewage treatment efficiency is low; 2. The above-mentioned sewage treatment device only uses tap water as domestic water, and directly discharges the treated sewage, which causes a certain degree of waste of water resources. Summary of the invention

[0005] The invention provides a domestic sewage recycling system to solve the technical problems of poor sewage treatment effect and waste of water resources in existing rural sewage treatment devices.

[0006] In order to solve the above problems, the present invention provides a domestic sewage recycling system adopting the following technical solutions: A domestic sewage recycling system includes a residence, a sewage source in the residence, a sewage pipe on one side of the sewage source, and the side where the sewage pipe is located is defined as the right side. It also includes a septic tank treatment device, which has a plurality of sedimentation tanks inside for sedimentation and filtration of sewage, the left end of the septic tank treatment device is connected to the sewage pipe, and the right end of the septic tank treatment device is provided with a sewage outlet; The biological treatment device is provided with a water distribution tank, an anaerobic tank, an aerobic tank, a facultative anaerobic tank and a sewage collection tank from left to right, so as to utilize microorganisms to decompose and treat the sewage. The left end of the biological treatment device is connected to the sewage outlet, and the right end thereof is provided with a sewage discharge pipe; A submerged wetland treatment device, comprising a plurality of artificial wetlands with a certain height difference, so as to purify sewage through wetland ecology, wherein the right end of the submerged wetland treatment device is connected to a sewage pipe, and the left end thereof has a drainage outlet; The biological pond treatment device includes an ecological pond with a variety of water purification plants to purify water through plants. The right end of the ecological pond is connected to the drain outlet, and a water purification pump for pumping water to the residence is arranged inside the drain pipe.

[0007] Its beneficial effects are: by sequentially arranging a septic tank treatment device, a biological treatment device, a submerged flow wetland treatment device and a biological pond treatment device, four-stage purification of domestic sewage is achieved, which significantly improves the purification efficiency and treatment effect of domestic sewage. At the same time, by arranging a water purification pump, a submerged flow wetland treatment device and a biological pond treatment device, the recycling of purified water and rainwater is achieved, which improves the utilization efficiency of water resources and avoids the waste of water resources.

[0008] Furthermore, the right side of the house is provided with a rainwater collecting pipe for collecting rainwater collected above the house, and the rainwater collecting pipe is connected to the end of the sewage pipe to discharge the rainwater into the submerged wetland treatment device.

[0009] The beneficial effect is that the provision of rainwater collection pipes improves the utilization rate of water resources, thereby reducing the water cost of residences while avoiding waste of water resources.

[0010] Furthermore, the septic tank treatment device comprises a primary sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank from left to right, a primary sedimentation tank suction pipe is provided at the lower left end of the primary sedimentation tank, a grid for filtering large impurities is provided between the primary sedimentation tank and the secondary sedimentation tank, a filter head is provided between the secondary sedimentation tank and the tertiary sedimentation tank, the sewage outlet is located at the right end of the tertiary sedimentation tank, and an observation port is provided at the upper end of each sedimentation tank.

[0011] Furthermore, the biological treatment device includes a biological treatment tank, the anaerobic tank, aerobic tank and facultative anaerobic tank are all located in the biological treatment tank, the anaerobic tank has a water distribution tank at the left end, the water distribution tank has a water inlet pipe at the left end, and a control valve is provided on the water inlet pipe; the water distribution tank has a water suction pump for pumping water into the anaerobic tank, and the upper end of the water suction pump has a water distribution pipe.

[0012] Furthermore, the bottoms of the anaerobic tank, aerobic tank, facultative anaerobic tank and sewage collection tank are all provided with sewage suction components, the sewage suction pipe system includes a sewage suction pipe, the sewage suction pipe is provided with multiple control valves, and a sewage suction pump is provided at the right end of the sewage suction pipe; the upper ends of the aerobic tank and the facultative anaerobic tank are provided with an aeration component, the aeration component includes an aeration pipe located in the aerobic tank and the facultative anaerobic tank, the aeration pipe is provided with a control valve, and the upper end of the aeration pipe is provided with an aeration pump to pump air into the aerobic tank and the facultative anaerobic tank.

[0013] Furthermore, the anaerobic tank and the facultative anaerobic tank both include multiple compartments, the left end of the biological treatment tank is provided with a sewage inlet pipe connected to the sewage outlet, the sewage inlet pipe includes a main pipe and branch pipes connected to each compartment, and control valves are provided on the branch pipes; the right end of the anaerobic tank is provided with a water filter grid, and the right end of the water filter grid has multiple water outlets, the aerobic tank is provided with a water suction pump, and the right end of the water suction pump corresponds to the compartment in the facultative anaerobic tank. There are multiple water suction pipes, and the water suction pipes are provided with a control valve.

[0014] Furthermore, a plurality of sewage outlets are provided between the facultative anaerobic tank and the sewage collection tank; and a plurality of observation ports are provided at the upper end of the biological treatment tank to observe the status of each treatment tank.

[0015] Furthermore, the subsurface flow wetland treatment device is provided with a primary wetland, a secondary wetland and a tertiary wetland from right to left, and the height of the artificial wetland decreases from right to left, a connecting pipe is provided between two adjacent wetlands, a water inlet connected to a sewage pipe is provided at the right end of the primary wetland, and the drainage outlet is located at the left end of the tertiary wetland; there is filler in the artificial wetland, and the filler diameters of the primary wetland, the secondary wetland and the tertiary wetland decrease successively.

[0016] Furthermore, an ecological planting layer for planting submerged plants is provided at the bottom of the ecological pond, an artificial floating island for planting emergent plants is provided on the water surface, an ecological grass ditch for purifying surface water is provided on the left side of the ecological pond, the interior of the ecological grass ditch is filled with filter materials, and a water collection pipe is provided between the ecological grass ditch and the ecological pond.

[0017] Furthermore, the upper end of the clean water pump is provided with a clean water pipe connected to the residence, and the water inlet pipe is connected to the clean water pipe to supply water to the water distribution tank; a sewage primary filtration pipe is provided between the sewage pipe and the sewage inlet pipe, and the left end of the sewage primary filtration pipe is provided with a filter head for preliminarily screening the sewage, and the upper end of the filter head is provided with a pressure pipe connected to the clean water pipe, and the pressure pipe is provided with a pressurizing device to flush the filter head periodically by pressurizing the clean water.

[0018] The beneficial effect is that the arrangement of the primary filter pipe and the secondary filter head can preliminarily screen the water body and impurities, thereby improving the efficiency of sewage treatment.

[0019] The beneficial effects of the domestic sewage recycling system provided by the present invention are: 1. By sequentially installing septic tank treatment devices, biological treatment devices, subsurface wetland treatment devices and biological pond treatment devices, four-stage purification of domestic sewage is achieved, which significantly improves the purification efficiency and treatment effect of domestic sewage. At the same time, by installing water purification pumps, subsurface wetland treatment devices and biological pond treatment devices, the recycling of purified water and rainwater is achieved, which improves the utilization efficiency of water resources and avoids the waste of water resources.

[0020] 2. The installation of rainwater collection pipes improves the utilization rate of water resources, avoids the waste of water resources and reduces the water cost of residences.

[0021] 3. The setting of primary filter pipe and secondary filter head can preliminarily screen water and impurities, thus improving the efficiency of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 The overall structure diagram of a domestic sewage recycling system provided by the present invention; Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A; Figure 3 for Figure 1 The structural schematic diagram of the septic tank treatment device shown; Figure 4 The structure of the biological treatment device shown in Figure 1 is schematically shown Figure 1 ; Figure 5 The structure of the biological treatment device shown in Figure 1 is schematically shown Figure 2 ; Figure 6 It is a structural schematic diagram of the subsurface flow wetland treatment device shown in Figure 1; Figure 7 It is a structural schematic diagram of the biological pond treatment device shown in Figure 1.

[0023] Description of reference numerals: 1. Residence; 11. Sewage source; 12. Rainwater collection pipe; 13. Sewage pipe; 14. Clean water pump; 15. Clean water pipe; 16. Water inlet pipe; 17. Control valve; 18. Pressure pipe; 19. Pressurizing device; 2. Septic tank treatment device; 21. Primary sedimentation tank; 22. Secondary sedimentation tank; 23. Tertiary sedimentation tank; 24. Primary sedimentation tank suction pipe; 25. Grille; 26. Filter head; 27. Observation port; 28. Sewage outlet; 3. Biological treatment device; 31. Water distribution tank; 311. Water suction pump; 312. Water distribution pipe; 313. Sewage inlet pipe; 314. Main pipe; 315. Branch pipe; 32. Anaerobic tank; 321. Water filter grid; 322. Water outlet; 33. Aerobic tank; 331. Water suction pipe; 34. Facultative anaerobic tank; 341. Sewage outlet; 35. Sewage collection tank; 351. Sewage discharge pipe; 36. Sewage suction assembly; 361. Sewage suction pump; 362. Sewage suction pipe; 37. Aeration assembly; 371. Aeration pipe; 372. Aeration pump; 38. Compartment; 39. Biological treatment tank; 4. Subsurface wetland treatment device; 41. Water inlet; 42. Filler; 421. Crushed stone; 422. Gravel; 423. Fine stone; 43. Connecting pipe; 44. Drain; 45. Wetland plants; 46. Artificial wetland; 47. Primary wetland; 48. Secondary wetland; 49. Third wetland; 5. Biological pond treatment device; 51. Drain pipe; 52. Ecological grass ditch; 521. Planting soil layer; 522. Organic filter layer; 523. Fine sand; 53. Water collection pipe; 54. Ecological planting layer; 55. Artificial floating island; 56. Submerged plants; 57. Emergent plants; 58. Moisture-resistant plants; 59. Ecological pond; 6. Sewage primary filtration pipe; 61. Filter head; 62. Filter hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] The main idea of ​​the present invention is to achieve four-stage purification of domestic sewage by sequentially arranging a septic tank treatment device 2, a biological treatment device 3, a submerged flow wetland treatment device 4 and a biological pond treatment device 5, which can significantly improve the purification efficiency and treatment effect of domestic sewage. At the same time, by arranging a water purification pump 14, a submerged flow wetland treatment device 4 and a biological pond treatment device 5, the recycling of purified water and rainwater can be achieved, the utilization efficiency of water resources can be improved, and the waste of water resources can be avoided.

[0026] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0027] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0028] Embodiment 1 of a domestic sewage recycling system provided by the present invention: like Figures 1 to 7 As shown, the system includes a residence 1, and a septic tank treatment device 2, a biological treatment device 3, a submerged flow wetland treatment device 4 and a biological pond treatment device 5 are arranged outside the residence 1. A sewage source 11 generated by the discharge of domestic water is arranged inside the residence 1. The sewage is purified by the septic tank treatment device 2, the biological treatment device 3, the submerged flow wetland treatment device 4 and the biological pond treatment device 5 in sequence and can be reused for domestic water.

[0029] The following first introduces the septic tank treatment device 2. One side of the sewage source 11 is provided with a sewage pipe 13, and the side where the sewage pipe 13 is located is defined as the right side. The septic tank treatment device 2 is located on the right side of the residence 1, and has a primary sedimentation tank 21, a secondary sedimentation tank 22 and a tertiary sedimentation tank 23 therein from left to right. The upper end of the primary sedimentation tank 21 is connected to the sewage pipe 13 to receive sewage, and the lower left end of the primary sedimentation tank 21 is provided with a primary sedimentation tank suction pipe 24 for discharging precipitated impurities, a grid 25 for filtering large impurities is provided between the primary sedimentation tank 21 and the secondary sedimentation tank 22, a filter head 26 for filtering impurities and conveying sewage to the tertiary sedimentation tank 23 is provided between the secondary sedimentation tank 22 and the tertiary sedimentation tank 23, a sewage outlet 28 is provided at the lower right end of the tertiary sedimentation tank 23, and the upper ends of the primary sedimentation tank 21, the secondary sedimentation tank 22 and the tertiary sedimentation tank 23 are all provided with observation ports 27 for inspecting the sedimentation tanks.

[0030] The biological treatment device 3 is introduced below, which includes a biological treatment tank 39. The biological treatment tank 39 has a water distribution tank 31, an anaerobic tank 32, an aerobic tank 33, a facultative anaerobic tank 34 and a sewage collection tank 35 from left to right. The left end of the water distribution tank 31 has an inlet pipe 16 for pumping water into the water distribution tank 31, and the left end of the inlet pipe 16 has a control valve 17. The lower end of the water distribution tank 31 has a water suction pump 311, and the upper end of the water suction pump 311 has a water distribution pipe 312 connected to the anaerobic tank 32.

[0031] The anaerobic tank 32 and the facultative anaerobic tank 34 are both provided with three compartments 38. The left end of the biological treatment tank 39 is provided with a sewage inlet pipe 313 connected to the sewage outlet 28. The sewage inlet pipe 313 includes a main pipe 314 and branch pipes 315 connected to each compartment 38 of the anaerobic tank 32. The branch pipes 315 are each provided with a control valve 17. The right end of the anaerobic tank 32 is provided with a water filter grid 321 to filter impurities in the sewage. The right side of the water filter grid 321 corresponds to each compartment 38 has a water outlet 322 for discharging water to the aerobic tank 33.

[0032] The aerobic tank 33 has a water suction pump 311, and the right end of the water suction pump 311 corresponds to the compartment 38 in the facultative anaerobic tank 34 and has three water suction pipes 331, and the water suction pipe 331 is provided with a control valve 17; the right end of the facultative anaerobic tank 34 corresponds to the three compartments 38 and has three sewage outlets 341 for discharging water to the sewage collection tank 35, and the right end of the sewage collection tank 35 is provided with a sewage discharge pipe 351; the bottom of the anaerobic tank 32, the aerobic tank 33, the facultative anaerobic tank 34 and the sewage collection tank 35 are all provided with a sewage suction component 36, and the sewage suction pipe 362 system includes a sewage suction pipe 362 connected to each treatment tank, and the sewage suction pipe 362 has a plurality of control valves 17 corresponding to each treatment tank, and the right end of the sewage suction pipe 362 is provided with a sewage suction pump 361 to discharge solid impurities.

[0033] In addition, an aeration assembly 37 is also provided at the upper end of the aerobic tank 33 and the facultative anaerobic tank 34. The aeration assembly 37 includes an aeration pipe 371 located in the aerobic tank 33 and the facultative anaerobic tank 34. A control valve 17 is provided on the aeration pipe 371. An aeration pump 372 is provided at the upper end of the aeration pipe 371 to pump air into the aerobic tank 33 and the facultative anaerobic tank 34. The upper end of the biological treatment tank 39 has a plurality of observation ports 27 corresponding to each treatment tank to observe the status of each treatment tank.

[0034] The subsurface flow wetland treatment device 4 is introduced below. The subsurface flow wetland treatment device 4 is provided with a primary wetland 47, a secondary wetland 48 and a tertiary wetland 49 from right to left, and the height of the artificial wetland 46 decreases from right to left; each artificial wetland 46 has a filler 42, the filler 42 in the primary wetland 47 is large-particle crushed stone 421, the filler 42 in the secondary wetland 48 is crushed stone 421 and gravel 422 from top to bottom, and the particle diameter of gravel 422 is smaller than that of crushed stone 421, and the filler 42 in the tertiary wetland 49 is crushed stone 421, gravel 422 and fine stone 423 from top to bottom, and the particle diameter of fine stone 423 is smaller than that of gravel 422.

[0035] A horizontal connecting pipe 43 is arranged between two adjacent wetlands, wherein the connecting pipe 43 between the primary wetland 47 and the secondary wetland 48 connects the bottom of the gravel 421 layer of the primary wetland 47 and the bottom of the gravel 421 layer of the secondary wetland 48, and the connecting pipe 43 between the secondary wetland 48 and the tertiary wetland 49 connects the bottom of the gravel 421 layer of the secondary wetland 48 and the bottom of the gravel 421 layer of the tertiary wetland 49. The setting of the filler 42 can remove pollutants in the water body by physical filtration of sewage; the right end of the primary wetland 47 has an inlet 41 connected to the sewage pipe 351, and the bottom of the gravel 422 layer at the left end of the tertiary wetland 49 has an outlet 322, and the upper end of the filler 42 of each artificial wetland 46 has planting soil and wetland plants 45 to purify the water body by biodegradation and plant absorption.

[0036] The following is an introduction to the biological pond treatment device 5, which includes an ecological pond 59. The right end of the ecological pond 59 is provided with a drainage pipe 51 connected to the drainage outlet 44. An ecological planting layer 54 is provided at the bottom of the ecological pond 59. Submerged plants 56 are planted on the ecological planting layer 54. An artificial floating island 55 is provided on the water surface, on which emergent plants 57 are planted. Moisture-resistant plants 58 are planted on both sides of the ecological pond 59. In addition, an ecological grass ditch 52 for purifying surface water is provided on the left side of the ecological pond 59. The interior of the ecological grass ditch 52 is filled with filter materials. The filter materials include a planting soil layer 521, an organic filter layer 522, fine sand 523 and gravel 422 from top to bottom. The bottom of the ecological grass ditch 52 is provided with a water collection pipe 53 connected to the ecological pond 59 to flow the purified surface water into the ecological pond 59.

[0037] In addition, a rainwater collection pipe 12 for collecting rainwater collected above the house 1 is provided above the house 1. The rainwater collection pipe 12 is connected to the end of the sewage pipe 351 to discharge the rainwater into the subsurface wetland treatment device 4. A sewage primary filtration pipe 6 is provided between the sewage pipe 13 and the sewage inlet pipe 313. The left end of the sewage primary filtration pipe 6 has a hemispherical filter head 61 for preliminary screening of sewage. The upper end of the filter head 61 has a plurality of filter holes 62. The upper end of the filter head 61 has a pressure pipe 18 connected to the clean water pipe 15. The pressure pipe 18 is provided with a pressurizing device 19 to flush the filter head 61 by pressurizing the clean water in a timely manner; a clean water pump 14 is provided at the bottom of the ecological pond 59. The upper end of the clean water pump 14 has a clean water pipe 15 connected to the house 1. The water inlet pipe 16 is connected to the clean water pipe 15 to supply water to the water distribution tank 31.

[0038] The working principle of the system is as follows: the sewage generated by domestic water is discharged into the septic tank treatment device 2 through the sewage pipe 13, and a part of the sewage in the sewage pipe 13 is discharged into the anaerobic tank 32 in the biological treatment tank 39 through the sewage primary filtration pipe 6; the sewage in the septic tank treatment device 2 is discharged into the anaerobic tank 32 through the sewage outlet 28 after sedimentation and filtration in three sedimentation tanks, and the sludge generated by sedimentation in the primary sedimentation tank 21 is regularly discharged through the primary sedimentation tank suction pipe 24.

[0039] Under the control of the control valve 17, the sewage is discharged into the anaerobic tank 32. At the same time, water is supplied to the anaerobic tank 32 through the water suction pump 311 to improve the treatment capacity of the anaerobic tank 32. Then, the sewage is filtered through the water filter grid 321 and enters the aerobic tank 33. Then, the sewage enters the facultative anaerobic tank 34 through the water suction pump 311. The sewage then enters the sewage collection tank 35 through the sewage outlet 341. Under the action of the aeration component 37, the aerobic tank 33 and the facultative anaerobic tank 34 can further decompose organic matter and harmful substances in the water body. At the same time, the sewage suction component 36 discharges the sludge at the bottom of the anaerobic tank 32, the aerobic tank 33 and the facultative anaerobic tank 34.

[0040] The sewage in the sewage collection pool 35 is discharged into the primary wetland 47 through the sewage pipe 351, and flows through the secondary wetland 48 and the tertiary wetland 49 through the connecting pipe. The filler 42 in the wetland can absorb organic matter and suspended particles in the sewage, and the wetland plants 45 can absorb nutrients in the sewage, such as carbon, nitrogen, phosphorus, etc., so as to purify the water quality; after the wetland treatment, the water body flows into the ecological pond 59 and is further purified by the plants in the pond; the water body in the ecological pond 59 is returned to the residence 1 through the water suction pump 311, which can meet the demand for domestic water, thereby achieving the effect of circulating water.

[0041] Embodiment 2 of a domestic sewage recycling system provided by the present invention: The main difference between it and Example 1 is: In Example 1, the water distribution tank is supplied with water through a clean water pipe.

[0042] In this embodiment, the water distribution tank is supplied with water through a rainwater collection pipe.

[0043] Embodiment 3 of a domestic sewage recycling system provided by the present invention: The main difference between it and Example 1 is: In Example 1, aeration pipes are provided in the aerobic tank and the facultative anaerobic tank.

[0044] In this embodiment, aeration plates are provided at the bottom of the aerobic tank and the facultative anaerobic tank.

[0045] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0046] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A domestic sewage recycling system, comprising a residence, a sewage source in the residence, a sewage pipe on one side of the sewage source, the side where the sewage pipe is located is defined as the right side, characterized in that: Also includes: A septic tank treatment device, which has multiple sedimentation tanks inside for settling and filtering sewage, the left end of the septic tank treatment device is connected to the sewage pipe, and the right end of the septic tank treatment device is provided with a sewage outlet; The biological treatment device is provided with a water distribution tank, an anaerobic tank, an aerobic tank, a facultative anaerobic tank and a sewage collection tank from left to right, so as to utilize microorganisms to decompose and treat the sewage. The left end of the biological treatment device is connected to the sewage outlet, and the right end thereof is provided with a sewage discharge pipe; A submerged wetland treatment device, comprising a plurality of artificial wetlands with a certain height difference, so as to purify sewage through wetland ecology, wherein the right end of the submerged wetland treatment device is connected to a sewage pipe, and the left end thereof has a drainage outlet; The biological pond treatment device includes an ecological pond with a variety of water purification plants to purify water through plants. The right end of the ecological pond is connected to the drain outlet, and a water purification pump for pumping water to the residence is arranged inside the drain pipe.

2. A domestic sewage recycling system according to claim 1, characterized in that: The right side of the house is provided with a rainwater collecting pipe for collecting rainwater collected above the house, and the rainwater collecting pipe is connected with the end of the sewage pipe to discharge the rainwater into the subsurface wetland treatment device.

3. A domestic sewage recycling system according to claim 2, characterized in that: The septic tank treatment device comprises a primary sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank from left to right, a primary sedimentation tank suction pipe is provided at the lower left end of the primary sedimentation tank, a grid for filtering large impurities is provided between the primary sedimentation tank and the secondary sedimentation tank, a filter head is provided between the secondary sedimentation tank and the tertiary sedimentation tank, the sewage outlet is located at the right end of the tertiary sedimentation tank, and an observation port is provided at the upper end of each sedimentation tank.

4. A domestic sewage recycling system according to claim 3, characterized in that: The biological treatment device comprises a biological treatment tank, wherein the anaerobic tank, the aerobic tank and the facultative anaerobic tank are all located in the biological treatment tank, wherein the left end of the anaerobic tank is provided with a water distribution tank, the left end of the water distribution tank is provided with a water inlet pipe, and a control valve is arranged on the water inlet pipe; the water distribution tank is provided with a water suction pump for pumping water into the anaerobic tank, and the upper end of the water suction pump is provided with a water distribution pipe.

5. A domestic sewage recycling system according to claim 4, characterized in that: The bottoms of the anaerobic tank, aerobic tank, facultative anaerobic tank and sewage collection tank are all provided with sewage suction components, the sewage suction pipe system comprises a sewage suction pipe, the sewage suction pipe is provided with a plurality of control valves, and a sewage suction pump is provided at the right end of the sewage suction pipe; the upper ends of the aerobic tank and the facultative anaerobic tank are provided with an aeration component, the aeration component comprises an aeration pipe located in the aerobic tank and the facultative anaerobic tank, the aeration pipe is provided with a control valve, and the upper end of the aeration pipe is provided with an aeration pump to pump air into the aerobic tank and the facultative anaerobic tank.

6. A domestic sewage recycling system according to claim 5, characterized in that: The anaerobic tank and the facultative anaerobic tank both include multiple compartments. The left end of the biological treatment tank is provided with a sewage inlet pipe connected to the sewage outlet. The sewage inlet pipe includes a main pipe and branch pipes connected to each compartment, and control valves are provided on the branch pipes. The right end of the anaerobic tank is provided with a water filter grid, and the right end of the water filter grid has multiple water outlets. The aerobic tank is provided with a water suction pump, and the right end of the water suction pump corresponds to the compartments in the facultative anaerobic tank. The water suction pipes are provided with control valves.

7. A domestic sewage recycling system according to claim 6, characterized in that: A plurality of sewage outlets are arranged between the facultative anaerobic tank and the sewage collection tank; a plurality of observation ports are also arranged at the upper end of the biological treatment tank to observe the status of each treatment tank.

8. A domestic sewage recycling system according to claim 7, characterized in that: The subsurface flow wetland treatment device is provided with a primary wetland, a secondary wetland and a tertiary wetland from right to left, and the height of the artificial wetland decreases from right to left, a connecting pipe is provided between two adjacent wetlands, a water inlet connected to a sewage pipe is provided at the right end of the primary wetland, and the drainage outlet is located at the left end of the tertiary wetland; there is filler in the artificial wetland, and the diameter of the filler in the primary wetland, the secondary wetland and the tertiary wetland decreases successively.

9. A domestic sewage recycling system according to claim 8, characterized in that: The bottom of the ecological pond is provided with an ecological planting layer for planting submerged plants, and the water surface is provided with an artificial floating island for planting emergent plants. The left side of the ecological pond is provided with an ecological grass ditch for purifying surface water, which is filled with filter materials, and a water collection pipe is provided between the ecological grass ditch and the ecological pond.

10. A domestic sewage recycling system according to claim 9, characterized in that: The upper end of the clean water pump is provided with a clean water pipe connected to the residence, and the water inlet pipe is connected to the clean water pipe to supply water to the water distribution tank; a sewage primary filter pipe is provided between the sewage pipe and the sewage inlet pipe, and the left end of the sewage primary filter pipe is provided with a filter head for preliminary screening of sewage, and the upper end of the filter head is provided with a pressure pipe connected to the clean water pipe, and the pressure pipe is provided with a pressurizing device to flush the filter head regularly by pressurizing the clean water.

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