CN111747606A - Ecological rural domestic sewage treatment system - Google Patents
Ecological rural domestic sewage treatment system Download PDFInfo
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- CN111747606A CN111747606A CN202010513899.2A CN202010513899A CN111747606A CN 111747606 A CN111747606 A CN 111747606A CN 202010513899 A CN202010513899 A CN 202010513899A CN 111747606 A CN111747606 A CN 111747606A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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Abstract
The invention provides an ecological rural domestic sewage treatment system which comprises a grid well, a grit chamber, an adjusting tank, an anaerobic fermentation tank, a sedimentation tank, a water drop aeration platform, a vertical flow constructed wetland, a collection channel and a middle water tank, wherein the grid well, the grit chamber, the adjusting tank, the anaerobic fermentation tank, the sedimentation tank, the water drop aeration platform, the vertical flow constructed wetland, the collection channel and the middle water tank are sequentially connected along the sewage flow direction; the anaerobic fermentation tank is divided into two reaction chambers by a partition plate, and a combined filler is arranged in the second reaction chamber; wetland plants are planted in the vertical flow artificial wetland, and a penetrating matrix layer and a first perforated water collecting pipe are respectively paved at the middle lower part and the bottom of the vertical flow artificial wetland; the vertical flow artificial wetland is also internally divided into a vertical downstream wetland and a vertical upstream wetland by a partition wall, and a perforated water distribution pipe communicated with the outlet of the drop aeration table is arranged on the water surface of the vertical downstream wetland along the water flow direction; and a second perforated water collecting pipe is arranged on the top surface of the substrate layer in the vertical upstream wetland along the water flow direction. The invention combines rural sewage treatment with ecological landscape construction, and has the advantages of low energy consumption, low investment, small occupied area and convenient operation and management.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an ecological rural domestic sewage treatment system.
Background
Along with the rapid growth of the economy of China, the urbanization process is accelerated, the living standard of the rural area is continuously improved, the industries such as livestock and poultry cultivation, aquaculture, agricultural and sideline product processing and the like of the rural area are developed, and the production amount and the daily increase of domestic sewage and wastewater of the rural area are greatly increased. Most of the sewage is directly discharged in rivers and lakes without any treatment, so that the water pollution is more and more serious.
In recent years, rural domestic sewage treatment projects are developed all over the country, and most of the rural domestic sewage treatment projects adopt integrated equipment such as an activated sludge process, a biological contact oxidation process, a Membrane Bioreactor (MBR) and the like. Most of the integrated equipment adopting the process has the defects of high energy consumption, high operating cost, more electrical equipment, large maintenance workload, weak impact load resistance and the like.
The thinking and the technical route of rural domestic sewage treatment are different from the urban domestic sewage treatment, and are more suitable for the technical route which mainly adopts environmental ecological engineering and assists environmental engineering; and the basic principle of 'ecological cycle and utilization are firstly' is followed to realize the organic connection of rural domestic sewage treatment and ecological agricultural development and rural ecological civilization construction.
Disclosure of Invention
The invention aims to provide an ecological rural sewage treatment system aiming at the characteristics of rural domestic sewage in China and based on the rural reality in China and taking ecology as the basis and green development as the guide. The invention has low energy consumption, low investment, small occupied area and convenient operation and management, combines rural sewage treatment with ecological landscape construction, and realizes resource utilization of rural sewage treatment according to local conditions.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an ecological rural domestic sewage treatment system which is characterized by comprising a grid well, a grit chamber, an adjusting tank, an anaerobic fermentation tank, a sedimentation tank, a water drop aeration platform, a vertical flow constructed wetland, a collection channel and a middle water tank which are sequentially arranged along the sewage flow direction; fine grids are obliquely arranged at the bottom of the side wall, connected with the grit chamber, in the grid well, a first submersible pump is arranged at the bottom in the adjusting tank, and the first submersible pump is connected to a water inlet of the anaerobic fermentation tank through a pipeline; the anaerobic fermentation tank is divided into a first reaction chamber and a second reaction chamber along the water flow direction by a partition plate in the anaerobic fermentation tank, and a combined filler is arranged in the second reaction chamber and used for increasing the total amount of organisms in the anaerobic fermentation tank and improving the Chemical Oxygen Demand (COD)cr) The removal rate is reduced, and the sludge loss is reduced; the effluent of the combined filler automatically flows into the sedimentation tank through a pipeline, a sludge hopper is arranged at the bottom of the sedimentation tank, and the retention time of sewage in the sedimentation tank is 4-6 hours; the effluent of the sedimentation tank automatically flows into the water drop aeration table through a triangular overflow weir at the top of the water drop aeration table; wetland plants are planted in the vertical flow artificial wetland, and a penetrating matrix layer and a first perforated water collecting pipe are respectively paved at the middle lower part and the bottom of the vertical flow artificial wetland; the vertical flow artificial wetland is also internally divided into a first-stage vertical downstream wetland and a second-stage vertical upstream wetland along the water flow direction by a partition wall, a perforated water distribution pipe is arranged on the water surface of the first-stage vertical downstream wetland along the water flow direction, and the perforated water distribution pipe is communicated with an outlet of the drop aeration table; a second perforated water collecting pipe is arranged on the top surface of the substrate layer in the second-stage vertical upstream wetland along the water flow direction; the water outlet of the second perforated water collecting pipe is sequentially connected with the collecting channel and the reclaimed water tank through a pipeline, and a second submersible pump connected with the water outlet pipe is arranged at the bottom in the reclaimed water tank.
Further, sewage enters a first-stage vertical downstream wetland through the perforated water distribution pipe, sequentially flows through the wetland plants and the substrate layer from top to bottom, and then is converged into a first perforated water collecting pipe positioned at the bottom of the first-stage vertical downstream wetland; and sewage treated by the first-stage vertical downstream wetland enters the second-stage vertical upstream wetland through the first perforated water collecting pipe, sequentially flows through the substrate layer and wetland plants from bottom to top and then is converged into the second perforated water collecting pipe.
Furthermore, a first maintenance back-flushing vertical pipe perpendicular to the water surface is arranged in the first-stage vertical downstream wetland and is simultaneously connected with the perforated water distribution pipe and the first perforated water collecting pipe; the second-stage vertical upstream wetland is provided with a second maintenance backwashing vertical pipe vertical to the water surface and connected with the second perforated water collecting pipe; ball valves are arranged on the first maintenance back washing vertical pipe, the second maintenance back washing vertical pipe and the perforated water distribution pipe.
The invention has the characteristics and beneficial effects that:
1. the second grid of the anaerobic fermentation tank is internally provided with the multi-dimensional bionic biological combined filler, the specific surface area is large, the microbial attachment amount is improved by 2-4 times compared with that of the conventional filler, the biofilm formation is fast, the growth and update speed of the biofilm is fast, the high-load impact resistance is realized, and the COD (chemical oxygen demand) iscrThe removal rate is high, and the treatment effect is good;
2. the multi-dimensional bionic biological combined filler is of a curtain type structure, a water flow channel can be reasonably designed according to the type of the anaerobic fermentation tank, the hydraulic condition is effectively improved, the mass transfer efficiency of the anaerobic fermentation tank is improved, and the defects that the water distribution of the anaerobic fermentation tank is uneven and the dead zone is large are overcome;
3. the retention time of the sedimentation tank is long, the load of the inflow suspended matters of the subsequent artificial wetland units can be reduced, and the blocking speed of the wetland substrate layer is delayed. In addition, the design volume of the sludge bucket of the sedimentation tank is larger, so that the sludge clearing times can be reduced, and the later maintenance and management are facilitated;
4. the water inlet end of the vertical flow artificial wetland is provided with a drop aeration platform, so that the oxygenation condition of the wetland can be effectively improved, and the pollutant removal efficiency is improved;
5. the effluent is used for farmland irrigation in non-rainy seasons, and the problem of insufficient water for production and living of rural villagers with resource water shortage can be solved. The rural domestic sewage treatment system can realize the organic combination of sewage treatment standard discharge and farmland irrigation recycling, and can realize the organic combination of sewage treatment facility construction and ecological landscape construction.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1 is a grid well, 2 is a grit chamber, 3 is a regulating tank, 4 is an anaerobic fermentation tank, 5 is a partition plate, 6 is a combined filler, 7 is a sedimentation tank, 8 is a triangular overflow weir, 9 is a first maintenance back-flushing vertical pipe, 10 is a ball valve, 11 is a first-stage vertical downstream wetland, 12 is a perforated water distribution pipe, 13 is a partition wall, 14 is wetland plants, 15 is a second-stage vertical upstream wetland, 16 is a collection channel, 17 is a middle water tank, 18 is a water outlet pipe, 19 is a fine grid, 20 is a submersible pump, 21 is a first reaction chamber, 22 is a second reaction chamber, 23 is a sludge hopper, 24 is a water-dropping aeration platform, 25 is a vertical-flow artificial wetland, 26 is a substrate layer, 27 is a first perforated water collecting pipe, 28 is a second maintenance back-flushing vertical pipe, and 29 is a second perforated water collecting pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
In order to better understand the invention, the following detailed description is provided for an application example of the ecological rural domestic sewage treatment system.
The invention provides an ecological rural domestic sewage treatment system, and the overall structure of the system is shown in figure 1. The ecological rural domestic sewage treatment system comprises a grating well 1, a grit chamber 2, an adjusting tank 3, an anaerobic fermentation tank 4, a sedimentation tank 7, a water drop aeration platform 24, a vertical flow artificial wetland 25, a collection channel 16 and a middle water tank 17 which are sequentially connected along the sewage flow direction (the direction shown by the arrow in the figure). After being collected by a pipe network, the rural domestic sewage flows into the reclaimed water tank 17 after being treated by the system to reach the standard, is used for farmland irrigation in non-rainy seasons, realizes resource utilization of the rural domestic sewage, and solves the problem of rural resource water shortage; in rainy season, the waste water can be directly discharged to a downstream river channel.
The specific implementation and functions of the components of the invention are described as follows:
grid well 1, grit chamber 2, 3 three ponds of equalizing basin are built jointly, realize intercommunication each other through reserving the hole, the bottom slope of the continuous lateral wall with grit chamber 2 in grid well 1 is equipped with thin grid 19, thin grid inclination 60, rural domestic sewage carries out the primary filtration through thin grid 19 after flowing into grid well 1, debris and the solid matter of large granule in the rural domestic sewage of separation, rural domestic sewage through the primary filtration gets into equalizing basin 3 after separating out fine particulate matters such as silt in grit chamber 2, through the filtration of grid well 1 and grit chamber 2, can prevent the jam of filler and pipeline in the follow-up sewage treatment unit. The bottom in the equalizing basin 3 is provided with a submersible pump 20 which mainly plays a role in sewage lifting. Sewage gets into anaerobic fermentation tank 4 through the pipeline after the equal volume of preliminary homogeneity of equalizing basin 3 to improve the biodegradability of sewage by a wide margin, reduce the concentration of organic matter and suspended solid in the sewage.
The anaerobic fermentation tank 4 is internally divided into a first reaction chamber 21 and a second reaction chamber 22 along the water flow direction by a partition plate 5, and the first reaction chamber 21 and the second reaction chamber are connected through a reserved hole. The first reaction chamber 21 also has the ability to condition the wastewater, where it flows through to effect the degradation of the contaminants by the action of anaerobic bacteria (naturally occurring). A combined filler 6 is arranged in the second reaction chamber 22, the combined filler 6 is a market multidimensional bionic combined filler with a large specific surface area of 4000-5000 m2/m3The total amount of organisms in the anaerobic fermentation tank 4 can be greatly improved; the combined filler 6 has fast film formation, fast biomembrane growth and renewal, high load impact resistance and capacity of raising CODcrThe removal rate of (d); meanwhile, the combined filler 6 can intercept the water inlet suspended matters and part of suspended sludge, so that the sludge loss is reduced. The combined filler 6 adopts a curtain type structure, can effectively improve hydraulic conditions, improves mass transfer efficiency, and solves the defects of uneven water distribution and larger dead zone which plague the conventional anaerobic process unit.
The effluent of the anaerobic fermentation tank 4 automatically flows into a sedimentation tank 7 through a pipeline, the sedimentation tank 7 adopts a horizontal flow type, and the bottom of the sedimentation tank is provided with a sludge hopper 23. The retention time of the sewage in the sedimentation tank 7 is longer and is 4-6 hours, so that the load of the inflow suspended matters of the subsequent vertical flow artificial wetland 25 can be ensured to be lower, and the blocking speed of the filter material is delayed; on the other hand, along with the increase of the retention time, the effective volume of the sedimentation tank 7 and the sludge hopper 23 at the bottom of the sedimentation tank are increased, the sludge clearing times can be reduced by the larger volume of the sludge hopper 23, and the later maintenance and management are facilitated.
The effluent of the sedimentation tank 7 flows into a water drop aeration table 24 to improve the content of dissolved oxygen in water. Further, a triangular overflow weir 8 is arranged at the top of the water-dropping aeration platform 24. When the effluent of the sedimentation tank 7 flows through the triangular overflow weir 8, the effluent falls, the surface of the liquid level contacted with the air is continuously updated, and the oxygen in the air is transferred into the sewage, so that the oxygen content of the sewage is continuously improved, and the treatment effect of the subsequent vertical flow artificial wetland 25 is further improved.
The sewage oxygenated by the drop aeration platform 24 flows into the vertical flow artificial wetland 25 under the action of gravity to realize further purification of water quality. Wetland plants 14 are planted in the vertical flow constructed wetland 25, and a substrate layer 26 and a first perforated water collecting pipe 27 which penetrate through the vertical flow constructed wetland 25 are laid at the middle lower part and the bottom of the vertical flow constructed wetland 25 respectively. The vertical flow constructed wetland 25 is internally divided into a first-stage vertical downstream wetland 11 and a second-stage vertical upstream wetland 15 along the water flow direction by a partition wall 13. A perforated water distribution pipe 12 is arranged on the water surface of the first-stage vertical downstream wetland 11 along the water flow direction, and the perforated water distribution pipe 12 is communicated with the outlet of the water drop aeration platform 24; and a second perforated water collecting pipe 29 is arranged on the top surface of the substrate layer 26 in the second-stage vertical upstream wetland 15 along the water flow direction. The first-stage vertical downstream wetland 11 and the second-stage vertical upstream wetland 15 are operated in series, specifically, sewage enters the first-stage vertical downstream wetland 11 through the perforated water distribution pipe 12 positioned at the top of the first-stage vertical downstream wetland 11, sequentially flows through the wetland plants 14 and the substrate layer 26 from top to bottom, and then is converged into the first perforated water collection pipe 27 positioned at the bottom of the first-stage vertical downstream wetland 11. The first perforated water collecting pipe 27 transversely penetrates through the first-stage vertical downstream wetland 11 and the second-stage vertical upstream wetland 15 to realize the connection of the two stages of wetlands. Then, the sewage treated by the first-stage vertical downstream wetland 11 enters the second-stage vertical upstream wetland 15 through the first perforated water collecting pipe 27, sequentially flows through the substrate layer 26 and the wetland plants 14 from bottom to top, and finally flows into the second perforated water collecting pipe 29 positioned at the top of the substrate layer 26 in the second-stage vertical upstream wetland 15.
Furthermore, the perforated water distribution pipes 12 in the first-stage vertical downstream wetland 11, the first perforated water collection pipes 27 penetrating into the vertical flow artificial wetland 25 and the second perforated water collection pipes 29 in the second-stage vertical upstream wetland 15 are all arranged in a shape of Chinese character ri.
Further, in order to prevent the vertical flow artificial wetland 25 from being blocked and improve the operation efficiency of the system, a first maintenance back-wash vertical pipe 9 perpendicular to the water surface is arranged in the first-stage vertical downstream wetland 11 and is simultaneously connected with a perforated water distribution pipe 12 and a first perforated water collection pipe 27. A second maintenance back-flushing vertical pipe 28 vertical to the water surface is arranged in the second-stage vertical upstream wetland 15 and is connected with a second perforated water collecting pipe 29. The ball valves 10 are arranged on the first maintenance back-washing vertical pipe 9, the second maintenance back-washing vertical pipe 28 and the perforated water distribution pipe 12, and when the operation efficiency of the system is reduced, the back-washing function is started by adjusting the ball valves 10.
Furthermore, the matrix layer 26 in the vertical flow artificial wetland 25 is composed of limestone or building crushed stone, broken bricks, sand and the like, the porosity is more than or equal to 30 percent, and the volume density is 1.2 × 103～1.5×103kg/m3The water permeability rate is 15-20 m/h. The wetland plants 14 in the vertical flow artificial wetland 25 comprise canna, water bamboo and fern, 8-10 holes are planted in each square meter, 1-2 canna, 2-3 water bamboo and 2-3 fern are planted in each hole.
The second perforated water collecting pipe 29 in the vertical flow artificial wetland 25 is sequentially connected with the collecting channel 16 and the reclaimed water tank 17 through pipelines, and the bottom in the reclaimed water tank 17 is provided with a submersible pump 20 connected with the water outlet pipe 18. The effluent treated by the vertical flow artificial wetland 25 is collected by the collecting channel 16 and then flows into the middle water pool 17. In non-rainy season, the water in the intermediate water tank can be directly used for field irrigation through the water outlet pipe 18 under the lifting action of the submersible pump 20 in the intermediate water tank 17. In rainy season, the water in the middle water pool can be directly discharged to a downstream river channel through the water outlet pipe 18.
The working process of the ecological rural domestic sewage treatment system provided by the invention is as follows:
1) the sewage collected by the sewage pipe network firstly flows through the grid well 1, the grit chamber 2 and the adjusting tank 3 in sequence, and is primarily filtered to remove impurities, large solid matters, silt and other fine particles. The retention time of the grit chamber is 1-2 hours, and the effective water depth is 1-1.5 m. The residence time of the regulating pool is 2-3 hours.
2) After primary filtration, the sewage enters an anaerobic fermentation tank 4 to realize the large degradation of organic matters. The anaerobic fermentation tank 4 is internally divided into a first reaction chamber 21 and a second reaction chamber 22 along the water flow direction by a partition plate 5, wherein the second reaction chamber 22 is provided with a combined filler 6. Wherein the organic load of the first reaction chamber 21 is 0.3-0.5 kgCOD/(m)3D) the organic load of the second reaction chamber 22 is 0.15 to 0.25 kgCOD/(m)3D). The specific surface area of the combined filler 6 in the second reaction chamber 22 is 4000-5000 m2/m3。
3) The effluent of the anaerobic fermentation tank 4 enters a sedimentation tank 7 to realize the effective removal of suspended matters. The retention time of the sedimentation tank 7 is 4-6 h.
4) The effluent of the sedimentation tank 7 flows into the vertical flow artificial wetland 25 by gravity after being oxygenated by the drop aeration platform 24. The vertical flow constructed wetland 25 is internally divided into a first-stage vertical downstream wetland 11 and a second-stage vertical upstream wetland 15 along the water flow direction by a partition wall 13. Further, the hydraulic load of the vertical flow artificial wetland 25 is 0.6-1.0 m3/(m2D), the organic load of the first-stage vertical downstream wetland 11 is 0.15-0.20 kgCOD/(m)3D), the organic load of the second-stage vertical downstream wetland 15 is 0.10-0.15 kgCOD/(m)3·d)。
5) After the sewage is treated by the vertical flow artificial wetland 25, the water quality is further purified and flows into the middle water tank 17, and the sewage is used for non-rainy season farmland irrigation or is directly discharged to a downstream river channel through the water outlet pipe 18.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An ecological rural domestic sewage treatment system is characterized by comprising a grid well (1), a grit chamber (2), an adjusting tank (3), an anaerobic fermentation tank (4), a sedimentation tank (7), a water drop aeration platform (24), a vertical flow artificial wetland (25), a collection channel (16) and a middle water tank (17) which are sequentially arranged along the sewage flow direction; wherein, a fine grid (19) is obliquely arranged at the bottom of the side wall connected with the grit chamber (2) in the grid well (1), a first submersible pump is arranged at the bottom in the adjusting tank (3), and the first submersible pump is connected to a water inlet of the anaerobic fermentation tank (4) through a pipeline; the anaerobic fermentation tank (4) is divided into a first reaction chamber (21) and a second reaction chamber (22) along the water flow direction by a partition plate (5) in the anaerobic fermentation tank (4), and a combined filler (6) is arranged in the second reaction chamber (22) and used for increasing the biological total amount of the anaerobic fermentation tank (4) and improving the Chemical Oxygen Demand (COD)cr) The removal rate is reduced, and the sludge loss is reduced; the effluent of the combined filler (6) automatically flows into the sedimentation tank (7) through a pipeline, a sludge hopper (23) is arranged at the bottom of the sedimentation tank (7), and the retention time of sewage in the sedimentation tank (7) is 4-6 hours; the effluent of the sedimentation tank (7) automatically flows into the water-dropping aeration table (24) through a triangular overflow weir (8) at the top of the water-dropping aeration table (24); wetland plants (14) are planted in the vertical flow artificial wetland (25), and a penetrating matrix layer (26) and a first perforated water collecting pipe (27) are respectively paved at the middle lower part and the bottom of the vertical flow artificial wetland (25); the vertical flow artificial wetland (25) is further divided into a first-stage vertical downstream wetland (11) and a second-stage vertical upstream wetland (15) along the water flow direction by a partition wall (13), and a perforated water distribution pipe is arranged on the water surface of the first-stage vertical downstream wetland (11) along the water flow direction(12) The perforated water distribution pipe (12) is communicated with an outlet of the water drop aeration platform (24); a second perforated water collecting pipe (29) is arranged on the top surface of the substrate layer (26) in the second-stage vertical upstream wetland (15) along the water flow direction; the water outlet of the second perforated water collecting pipe (29) is sequentially connected with the collecting channel (16) and the middle water pool (17) through a pipeline, and a second submersible pump connected with the water outlet pipe (18) is arranged at the bottom in the middle water pool (17).
2. The ecological rural domestic sewage treatment system according to claim 1, wherein the inclination angle of the fine grid (19) is 60 °.
3. The ecological rural domestic sewage treatment system of claim 1, wherein the combined filler (6) is a multi-dimensional bionic combined filler and has a curtain structure.
4. The ecological rural domestic sewage treatment system of claim 1, wherein the sewage enters the first stage vertical downflow wetland (11) through the perforated water distribution pipe (12), flows through the wetland plants (14) and the substrate layer (26) from top to bottom in sequence, and then is converged into the first perforated water collection pipe (27) positioned at the bottom of the first stage vertical downflow wetland (11); the sewage treated by the first-stage vertical downstream wetland (11) enters the second-stage vertical upstream wetland (15) through the first perforated water collecting pipe (27), sequentially flows through the substrate layer (26) and the wetland plants (14) from bottom to top, and then flows into the second perforated water collecting pipe (29).
5. The ecological rural domestic sewage treatment system of claim 1 wherein the perforated distribution pipe (12), the first perforated header pipe (27) and the second perforated header pipe (29) are all arranged in a "ri" shape.
6. The ecological rural domestic sewage treatment system according to claim 1, wherein a first maintenance backwash vertical pipe (9) perpendicular to the water surface is arranged in the first-stage vertical downstream wetland (11) and is connected with the perforated water distribution pipe (12) and the first perforated water collection pipe (27); the second-stage vertical upstream wetland (15) is provided with a second maintenance back-flushing vertical pipe (28) vertical to the water surface and connected with the second perforated water collecting pipe (29); ball valves (10) are arranged on the first maintenance back flush vertical pipe (9), the second maintenance back flush vertical pipe (28) and the perforated water distribution pipe (12).
7. The ecological rural domestic sewage treatment system of claim 1, wherein the substrate layer (26) in the vertical flow constructed wetland (25) is made of limestone or construction crushed stone, broken brick and sand, the porosity is not less than 30%, and the bulk density is 1.2 × 103～1.5×103kg/m3The water permeability rate is 15-20 m/h; wetland plants (14) in the vertical flow artificial wetland (25) comprise canna, water bamboo and fern, 8-10 holes are planted in each square meter, 1-2 canna, 2-3 water bamboo and 2-3 fern are planted in each hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010513899.2A CN111747606A (en) | 2020-06-08 | 2020-06-08 | Ecological rural domestic sewage treatment system |
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