CN113529874A - Rural domestic sewage collecting and treating system and method - Google Patents
Rural domestic sewage collecting and treating system and method Download PDFInfo
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- CN113529874A CN113529874A CN202110806209.7A CN202110806209A CN113529874A CN 113529874 A CN113529874 A CN 113529874A CN 202110806209 A CN202110806209 A CN 202110806209A CN 113529874 A CN113529874 A CN 113529874A
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- 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
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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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
- C02F3/30—Aerobic and anaerobic processes
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
- E03B1/041—Greywater supply systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
- E03B1/041—Greywater supply systems
- E03B2001/045—Greywater supply systems using household water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a system and a method for collecting and treating rural domestic sewage. The rural domestic sewage collecting and treating system comprises a single-household sewage user-connecting pipe system, a multi-household sewage user-connecting pipe system, a branch main pipe drainage system, a small centralized sewage treatment system and a clear water recycling and discharging system, wherein the single-household sewage user-connecting pipe system is used for collecting sewage of each farmer, the single-household sewage user-connecting pipe systems of a plurality of farmers are communicated with the inlet end of the multi-household sewage user-connecting pipe system, the user-connecting wells of the plurality of farmers are connected into an inspection well through pipelines, the outlet end of the multi-household sewage user-connecting pipe system is communicated with the small centralized sewage treatment system through the branch main pipe drainage system, the small centralized sewage treatment system comprises a biochemical treatment unit for treating sewage, and the outlet end of the small centralized sewage treatment system is communicated with the clear water recycling and discharging system. The system can solve the problems of odor return, blockage, high investment, unstable effluent water reaching the standard and the like in rural sewage treatment.
Description
Technical Field
The invention relates to the technical field of rural domestic sewage treatment, in particular to a rural domestic sewage collecting and treating system and method.
Background
In recent years, China has started rural domestic sewage remediation projects comprehensively. As villages and towns usually do not have a complete drainage system, rainwater and domestic sewage are directly discharged into ditches and streams without being treated, and non-point source environmental pollution is caused to the environment. In order to improve the water environment quality of rural areas and realize the physical and mental health of rural residents and the healthy development of social economy, the pollution of sewage to underground water and the pollution of sewage direct discharge to river channels can be reduced by implementing sewage collection and treatment in respective natural villages, so that the ecological environment of rural areas is greatly improved.
At present, a relevant standard system aiming at domestic and rural sewage is still imperfect. Although the local standards of national standard 'rural domestic sewage treatment engineering technical standard' GB/T51347-2019 and 'rural domestic sewage treatment facility construction standard' describe the contents of the acceptance part of rural sewage treatment construction, the problems of difficult process determination and construction acceptance inspection according to local conditions still exist. In addition, the construction of part of rural sewage treatment pipe networks refers to the acceptance standard of municipal pipe network construction, so that the investment cost of the pipe networks is high.
In the operation stage of comprehensive treatment of rural domestic sewage, the following problems often occur: 1) the investment of each pipe network user is high; 2) the collecting pipeline and the processing equipment are blocked; 3) returning odor indoors for farmers; 4) the inflow in rainy season is large, the biochemical system is greatly influenced by impact, and the long-acting stable standard-reaching discharge of the effluent of the treatment equipment is difficult.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a system and a method for collecting and treating rural domestic sewage, which can solve the problems of odor return, blockage, high investment, unstable effluent reaching standards and the like in rural sewage treatment.
The invention provides a rural domestic sewage collecting and treating system which comprises a single-household sewage user-connecting pipe system, a multi-household sewage user-connecting pipe system, a branch main pipe drainage system, a small centralized sewage treatment system and a clear water recycling and discharging system, wherein the single-household sewage user-connecting pipe system is used for collecting sewage of each farmer, the single-household sewage user-connecting pipe systems of a plurality of farmers are communicated with the inlet ends of the multi-household sewage user-connecting pipe systems, user-connecting wells of the plurality of farmers are connected into an inspection well through pipelines, the outlet ends of the multi-household sewage user-connecting pipe systems are communicated with the small centralized sewage treatment system through the branch main pipe drainage system, the small centralized sewage treatment system comprises a biochemical treatment unit for treating sewage, and the outlet ends of the small centralized sewage treatment system are communicated with the clear water recycling and discharging system.
In the invention, the single-household sewage user-connecting pipe system is mainly used for collecting sewage of each farmer, and the sewage comprises but is not limited to kitchen grey water, toilet grey water, septic tank black water and the like; at this time, the single-household sewage user-receiving pipe system comprises a plurality of user-receiving pipes which are respectively used for collecting kitchen grey water, toilet grey water and septic tank black water. Further, in order to solve the problem of odor return in peasant household, a ventilation cap can be arranged at the front part or the rear part of the trap of the service pipe.
The material and the size of the service pipe are not strictly limited and can be reasonably set according to the actual condition. Specifically, a user connecting pipe of a kitchen and a toilet can be a UPVC pipe with a pipe diameter De75, and the minimum gradient of the pipeline can be 8 per thousand; the user connecting pipe of the septic tank in the toilet can adopt a UPVC pipe with the pipe diameter De110, and the minimum gradient of the pipeline can be 6 per thousand.
In order to solve the problem of blockage faults of pipe networks and treatment equipment, the service well can be a plastic drainage inspection well formed by injection molding once at 200 times; in addition, a cleaning opening can be arranged at the entrance end of a house connecting pipe of a toilet, a water seal well is arranged at the entrance end of the house connecting pipe of a kitchen, and a basket type oil filter screen can be arranged in the water seal well.
In the invention, a multi-user sewage service pipe system can be connected with a main pipe inspection well through a UPVC pipe with a pipe diameter De 160; aiming at typical row-in-row close residents (namely peasant households), the layout can be optimized, three residential service wells are merged and connected to be connected with a trunk pipe inspection well through De160UPVC pipes, the number of pipelines and inspection wells can be reduced after the optimized design, and further the investment and construction cost of a pipe network is reduced.
The multi-user sewage service pipe system can comprise double-wall corrugated pipes, such as DN200 and DN300 double-wall corrugated pipes, and moreover, the inspection well can adopt an HDPE phi 450 finished plastic inspection well.
Further, for the selection of the inspection well on the branch main pipe, when the buried depth of the pipeline is less than 3m and the pipeline is not under a motorway, a 450-step injection molding plastic inspection well can be selected (for a construction method, see plastic drainage inspection well in building districts (08SS 523)); when the pipeline buried depth is more than 3m or is positioned below a motor vehicle lane, a 1100 concrete module drainage inspection well can be selected (the construction method is shown in concrete module drainage inspection well (06MS 201-4)).
In the invention, the inspection wells are all selected from non-falling inspection wells, and the inspection wells are provided with anti-falling nets.
In the invention, the gradient of the branch main pipe is designed to be DN300 pipeline minimum gradient of 3 per thousand, DN200 pipeline minimum gradient of 3 per thousand, De160 pipeline minimum gradient of 3 per thousand, De110 pipeline minimum gradient of 6 per thousand, and De75 pipeline minimum gradient of 8 per thousand.
Furthermore, the top surface elevation of the inspection well is the pavement elevation of the pipeline position. When the manhole cover is positioned on a non-hardened ground, the manhole cover is 0.2m higher than the ground, so that rainwater is prevented from overflowing into a pipe network.
In addition, the pipe diameters De75, De110 and De160 of the service pipes can be spliced by adopting socket joint, and the burial depth of the starting points of the service pipes is not less than 0.30 m; if limited by field conditions, the concrete can be reduced properly, but the concrete is encapsulated by plain concrete with the thickness of 20 cm.
When the branch main pipe is excavated to construct DN200 and DN300 double-wall corrugated pipes, the pipeline burial depth is less than 4.0m, and the ring stiffness needs to reach 8kN/m2The above; pipelineThe buried depth is 4.0m-6.0m, and the ring stiffness must reach 10kN/m2The above; meanwhile, double rubber rings can be adopted for socket connection.
In addition, in the invention, the technical indexes of HDPE pipes can be found in national standard 'buried Polyethylene (PE) structural wall pipe system part 1 polyethylene double-wall corrugated pipe (GB/T194721-2004)'; the technical indexes of the UPVC drain pipe can be referred to buried pollution discharge and rigid polyvinyl chloride (PVC-U) pipe for waste water (GB/T10002.3-1996).
Furthermore, the foundation of the branch main pipe excavation pipeline adopts a soil arc foundation, and a pipe bottom foundation layer is laid on a foundation soil layer meeting the bearing capacity requirement. The original trench soil can be backfilled by adopting the original trench soil when the original trench soil does not belong to silt soil, soft clay with water content of more than 80%, construction waste, block stones with particle size of more than 20cm, silty soil silt with easy formation of quicksand and miscellaneous filling soil containing organic matters. When special soil quality is not satisfactory, medium coarse sand is adopted below the pipe top, medium sand, coarse sand and gravel chips can be adopted 500mm above the pipe top, and gravel is gathered and distributed with the maximum grain size of less than 40 mm. And (3) under the roadway, when the height of the top of the pipeline from the ground is less than 70cm, the pipeline is encapsulated by 20cm plain concrete.
In the invention, the plastic inspection well seat is made of HDPE material, and the shaft is made of HDPE winding structure walls. The rigidity of the well casing ring needs to reach 8kN/m2The above. The well seat is connected with the shaft and the well seat is connected with the branch pipe in a socket joint mode. The plastic inspection well cover under the roadway is provided with a protective cover seat. The plastic inspection well is based on a cushion layer of crushed stones (the grain diameter is 5-40mm) with the thickness of 15cm, medium coarse sand with the thickness of 5cm is paved on the cushion layer, and well pit backfill and excavation pipeline groove backfill (the well depth is less than or equal to 3 m).
In the invention, the small centralized sewage treatment system is mainly used for treating sewage, the specific structure of the system is not strictly limited, and the conventional sewage treatment device and the combination thereof in the field can be adopted. Specifically, the small centralized sewage treatment system can further comprise a regulating reservoir and an intelligent management and control system, the multi-family sewage user-connecting pipe system is communicated with the inlet end of the regulating reservoir through a sewage lifting pump, the outlet end of the regulating reservoir is communicated with the biochemical treatment unit, and the intelligent management and control system is connected with the sewage lifting pump to control the sewage lifting pump.
Further, a basket grid can be arranged at the inlet end of the regulating pool, and the grid gap of the basket grid can be 8-12mm, preferably 10 mm; the width of the grid bars may be 8-12mm, preferably 10 mm. The material and specific structure of the basket grid are not strictly limited, for example, SUS304 stainless steel can be used as the material, and the structure can include conventional parts such as guide rails (positioning grids) and stainless steel chains.
Especially, can set up liquid level floater and static pressure level gauge in the equalizing basin, intelligent management and control system is connected in order to acquire equalizing basin liquid level information with the static pressure level gauge, and intelligent management and control system controls the sewage elevator pump and closes when the equalizing basin is in high liquid level, controls the sewage elevator pump and opens when the equalizing basin is in low liquid level. The regulating reservoir is provided with high and low liquid levels, and adopts double-path (liquid level floating ball and static pressure liquid level meter) control, so that effective combination of liquid level regulation control and supervision can be realized, and further, the occurrence of pollution events of overflow stain sources caused by faults of the lifting pump can be avoided.
The treatment process of the biochemical treatment unit is not strictly limited, and for example, anaerobic treatment, anoxic treatment and moving bed biofilm aerobic treatment (A) can be adopted2The process has the advantages of both a traditional fluidized bed and biological contact oxidation, is stable and reliable in operation, strong in impact load resistance, good in denitrification effect, economical and efficient in sewage treatment, has the characteristics of quick start of a biochemical system, good denitrification and dephosphorization effects, less residual activated sludge, low investment and operation cost and the like, can well solve the impact influence of a large amount of incoming water on the biochemical system in rainy seasons, and further ensures long-acting stable standard discharge of outlet water of equipment.
More specifically, in the biochemical treatment unit, the section A can adopt spherical suspension packing, and the section O can adopt MBBR packing; in addition, a sludge internal reflux and sludge discharge system can be arranged and the automatic control operation is realized.
In the invention, the clean water recycling and discharging system can comprise a clean water bin and a lift pump. The clear water recycling and discharging system can meet the requirements of the chemical dosing system in the station for dissolving water and landscape greening irrigation water, and can lift the peripheral sensitive water body to a receivable water body in a long distance or recycle the peripheral sensitive water body for ecological water supplement.
The rural domestic sewage collecting and treating system solves the problem of indoor odor by optimizing the household connecting pipeline, solves the problem of pipe network blockage by arranging the grid well, reduces the number of pipelines and inspection wells by optimizing the household connecting pipeline and reducing the investment of the pipe network, maximally ensures that the effluent is stably discharged up to the standard by optimizing the small centralized treatment equipment process, and well solves the problems of odor return, blockage, high investment, unstable effluent up to the standard and the like in the conventional rural sewage treatment.
The invention also provides a rural domestic sewage collecting and treating method, which is used for collecting and treating the farmer sewage.
The implementation of the invention has at least the following advantages:
1. the single-household sewage service pipe system of a plurality of farmers is communicated with the multi-household sewage service pipe system, and simultaneously sewage of a plurality of users is communicated through the UPVC pipe of DN160 and then is connected into the branch main pipe inspection well, so that the service mode of the service pipe is optimized, the number of pipe networks and inspection wells is reduced, and the investment is further reduced;
2. the ventilating cap is arranged at the front part or the rear part of the trap of the service pipe, so that the problems of returning odor and the like in a farmer room are well solved;
3. the small centralized sewage treatment system is provided with the regulating tank, the regulating tank passes through high and low liquid levels h, and adopts double-path (a liquid level floating ball and a static pressure liquid level meter) control, so that the effective combination of liquid level regulation control and supervision can be realized, and the occurrence of pollution events of overflow stain sources caused by faults of a lifting pump can be avoided;
4. the biochemical treatment unit of the present invention adopts A2the/O + MBBR process has the characteristics of quick start of a biochemical system, stable and reliable operation, strong impact load resistance, good denitrification and dephosphorization effects, less residual activated sludge, low investment and operation cost and the like, can well solve the impact influence of a large amount of incoming water on the biochemical system in rainy seasons, and further ensures the long-acting stable standard discharge of the effluent of equipment;
5. the rural domestic sewage collecting and treating system is provided with the clear water recycling and discharging system, can recycle the treated effluent reaching the standard for farmland irrigation, greening sprinkling irrigation and river ecological water supplement, saves water resources, and is particularly suitable for northern rural areas short of water.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a rural domestic sewage collection and treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a single household sewage service pipe system according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a multi-household sewage drainage household pipe system according to an embodiment of the present invention.
Description of reference numerals:
1: a single-household sewage water household pipe connecting system; 2: a multi-household sewage water household pipe connecting system; 3: a branch main pipe drainage system; 4: a small centralized sewage treatment system; 5: a clear water recycling and discharging system; 6: a farmer; 7: a service well; 8: a septic tank; 9: a ventilation cap.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
With reference to fig. 1 to 3, the present embodiment provides a small centralized rural domestic sewage collecting and treating system, which includes five system parts, namely, a single-household sewage user-connecting pipe system 1, a multi-household sewage user-connecting pipe system 2, a branch main pipe drainage system 3, a small centralized sewage treatment system 4, and a clear water recycling and discharging system 5; the rural domestic sewage collecting and treating system is characterized in that black water of septic tanks 8 of households in a village and grey water of toilets and kitchens are delivered to a nearby sewage inspection well together with other sewage after going out of a household well, and then the black water and the grey water are conveyed to a small terminal centralized sewage treatment station for treatment through a main sewage pipeline in the village, and the treated water can be recycled or discharged into peripheral water bodies nearby.
In the rural domestic sewage collecting and treating system, the single-household sewage user-connecting pipe system 1 is used for collecting sewage of each farmer 6, the single-household sewage user-connecting pipe system 1 of a plurality of farmers 6 is communicated with the inlet end of the multi-household sewage user-connecting pipe system 2, the user-connecting wells 7 of a plurality of farmers 6 are connected into the inspection well through pipelines, the outlet end of the multi-household sewage user-connecting pipe system 2 is communicated with the small centralized sewage treating system 4 through the branch main pipe drainage system 3, the small centralized sewage treating system 4 comprises a biochemical treating unit for treating sewage, and the outlet end of the small centralized sewage treating system 4 is communicated with the clean water recycling and discharging system 5.
The single-household sewage water receiving pipe system 1 is used for collecting black water of a septic tank 8 and grey water of a kitchen and a toilet, and comprises a plurality of household pipes which are respectively used for collecting the grey water of the kitchen, the grey water of the toilet and the black water of the septic tank; the household connecting pipe is a white UPVC pipe, the household connecting pipe of a kitchen and a toilet is a pipe diameter De75, and the household connecting pipe of the septic tank 8 of the toilet is a pipe diameter De 110.
In order to solve the problem of odor return indoors, a ventilation cap 9 is additionally arranged at the ash water storage bend section of the washing room of the outdoor service pipe joint kitchen and the toilet, and the ventilation cap 9 can be arranged at the front part or the rear part of the ash water storage bend of the service pipe joint.
In addition, in order to solve the problem of blocking faults of pipe networks and treatment equipment, the user-receiving well 7 can be a 200-step injection molding plastic drainage inspection well, cleaning ports are designed and installed on indoor connecting pipelines, a water seal well is adopted as an oil isolation well at a kitchen receiving position, and the water seal well is matched with a basket type oil filter screen.
The multi-household sewage service pipe connecting system 2 is mainly connected with a main pipe inspection well through a De160UPVC pipe, is close to a household for a typical gang, can be optimally designed and arranged, is combined and connected with one main pipe inspection well through the De160UPVC pipe after a service connecting well 7 of three farmers 6, can reduce the number of pipelines and inspection wells after being optimally designed, and further reduces the investment and construction cost of a pipe network.
The branch main pipe drainage system 3 pipeline can be DN200 and DN300 double-wall corrugated pipes, and the inspection well is a HDPE phi 450 finished plastic inspection well.
The inspection well on the branch main pipe is a plastic inspection well formed by one-step injection molding of 450 times when the buried depth of the pipeline is less than 3m and the pipeline is not under a motor vehicle lane, which is described in plastic drainage inspection wells in building districts (08SS 523). When the pipeline is buried deeper than 3m or is positioned below a motor vehicle lane, a 1100 concrete module drainage inspection well is selected, which is detailed in concrete module drainage inspection well (06MS 201-4).
The inspection wells are all selected from non-falling inspection wells, and the inspection wells are provided with anti-falling nets.
The gradient of the branch main pipe is designed to be DN300 pipeline minimum gradient of 3 per mill, DN200 pipeline minimum gradient of 3 per mill, De160 pipeline minimum gradient of 3 per mill, De110 pipeline minimum gradient of 6 per mill, and De75 pipeline minimum gradient of 8 per mill.
The elevation of the top surface of the inspection well is the pavement elevation of the pipeline position. When the manhole cover is positioned on a non-hardened ground, the manhole cover is 0.2m higher than the ground, and rainwater can be prevented from overflowing into a pipe network.
The pipe diameters De75, De110 and De160 of the service pipes are spliced by socket joint, the burial depth of the starting points of the service pipes is not less than 0.30m, and the burial depth can be properly reduced when limited by field conditions, but the service pipes are encapsulated by plain concrete with the thickness of 20 cm.
The pipeline buried depth of branch main pipe excavation construction DN200 and DN300 is less than 4.0m, and the ring stiffness must reach 8kN/m2Above, the pipeline buried depth is 4.0m-6.0m, and the ring stiffness must reach 10kN/m2Above, two rubber circle socket joint are connected. The technical indexes of HDPE pipes are shown in national standard "buried Polyethylene (PE) structural wall pipe system part 1 polyethylene double-wall corrugated pipe (GB/T194721-2004)". The technical indexes of the UPVC drain pipe refer to 'buried pollution discharge and rigid polyvinyl chloride (PVC-U) pipe for wastewater' (GB/T10002.3-1996).
The foundation for excavating the pipeline by the branch main pipe adopts a soil arc foundation, and a pipe bottom foundation layer is laid on a foundation soil layer meeting the bearing capacity requirement. The original trench soil can be backfilled by adopting the original trench soil when the original trench soil does not belong to silt soil, soft clay with water content of more than 80%, construction waste, block stones with particle size of more than 20cm, silty soil silt with easy formation of quicksand and miscellaneous filling soil containing organic matters. When special soil quality is not satisfactory, medium coarse sand is adopted below the pipe top, medium sand, coarse sand and gravel chips can be adopted 500mm above the pipe top, and gravel is gathered and distributed with the maximum grain size of less than 40 mm. And (3) under the roadway, when the height of the top of the pipeline from the ground is less than 70cm, the pipeline is encapsulated by 20cm plain concrete.
HDPE material is selected for use to plastics inspection well seat, and HDPE winding structure wall is all selected for use to the pit shaft. The rigidity of the well casing ring needs to reach 8kN/m2The above. The well seat is connected with the shaft and the well seat is connected with the branch pipe in a socket joint mode. The plastic inspection well cover under the roadway is provided with a protective cover seat. The plastic inspection well is based on a cushion layer of crushed stones (the grain diameter is 5-40mm) with the thickness of 15cm, medium coarse sand with the thickness of 5cm is paved on the cushion layer, and well pit backfill and excavation pipeline groove backfill (the well depth is less than or equal to 3 m).
The small centralized sewage treatment system 4 can comprise a regulating reservoir, a sludge pool, a clean water pool, an integrated biochemical treatment tank (i.e. a biochemical treatment unit), an intelligent management and control system and the like; the treatment system equipment can comprise a basket grid, a sewage lifting pump, an air pump (fan), an aeration system, a dosing device, a disinfection device, an electromagnetic flowmeter (adopting a split type, and a display is arranged in a control cabinet), an electric automatic control system, fillers, valve pipes and the like. The multi-family sewage user-connecting pipe system 2 is communicated with the inlet end of the regulating tank through a sewage lifting pump, the outlet end of the regulating tank is communicated with the biochemical treatment unit, and the intelligent management and control system is connected with the sewage lifting pump to control the sewage lifting pump.
Further, can set up liquid level floater and static pressure level gauge in the equalizing basin, intelligence management and control system is connected in order to acquire equalizing basin liquid level information with the static pressure level gauge, and intelligence management and control system controls the sewage elevator pump and closes when the equalizing basin is in high liquid level, controls the sewage elevator pump and opens when the equalizing basin is in low liquid level. The regulating reservoir is provided with a high liquid level and a low liquid level, the static pressure liquid level meter can transmit the liquid level of the regulating reservoir to the PLC to be read by the intelligent platform, the intelligent management and control system is used for controlling the start and stop of the sewage lifting pump, the two-way control of the liquid level floating ball and the static pressure liquid level meter is adopted, and when the regulating reservoir is at the low liquid level, the sewage lifting pump is normally hydraulically conveyed; when the adjusting tank is at a high liquid level, the sewage lift pump stops hydraulic conveying. .
In addition, the adjusting tank is provided with a basket grid, the grid gap is 10mm, the width of the grid bars is 10mm, and the lifting basket grid can be used for lifting the cleaning effect. The basket grating can be made of SUS304 stainless steel and can comprise structural members such as a guide rail (positioning grating) and a stainless steel chain.
The integrated biochemical treatment tank body is made of PP or glass fiber reinforced plastic, and the thickness is more than or equal to 12 mm. The treatment process preferably comprises anaerobic treatment, anoxic treatment and moving bed biofilm aerobic treatment (A)2O + MBBR) process technology. The process has the advantages of both the traditional fluidized bed and biological contact oxidation, is stable and reliable in operation, strong in impact load resistance and good in denitrification effect, and is an economical and efficient sewage treatment process; in addition, the process has the characteristics of quick start of the biochemical system, good denitrification and dephosphorization effects, less residual activated sludge, low investment and operation cost and the like, can well solve the impact influence of a large amount of incoming water on the biochemical system in rainy seasons, and ensures the long-acting stable standard discharge of the outlet water of the equipment.
In the integrated biochemical treatment tank, the A section filler can be spherical suspension filler, and the O section filler can be MBBR filler; in addition, a sludge internal reflux and sludge discharge system can be arranged and the automatic control operation is realized.
The clean water recycling and discharging system 5 can be composed of a clean water bin and a lifting pump, meets the requirements of the chemical dosing system in the station for dissolving water and irrigating water for landscaping, and can lift the sensitive water body around to a receivable water body for a long distance or recycle the sensitive water body for ecological water supplement.
The rural domestic sewage collection and treatment system of this embodiment has solved indoor stink problem through optimizing the pipeline of meeting one's residence, has solved the pipe network through setting up the grid well and has blockked up the problem, has reduced pipeline and inspection shaft quantity through optimizing the pipeline of meeting one's residence mode of meeting one's residence and has reduced the pipe network investment, through preferred little centralized processing equipment technology, has guaranteed to go out water to stabilize discharge to reach standard to the maximize, has solved the stink that returns that exists among the current rural sewage treatment well, blocks up, the investment is high, it can not stabilize the scheduling problem of reaching standard to go out water.
Example 2
The embodiment provides a rural domestic sewage collecting and treating method, which adopts the rural domestic sewage collecting and treating system of the embodiment 1 to treat; the method comprises the following specific steps:
the treatment case is a PPP project for comprehensive treatment of rural domestic sewage in a certain city, and the PPP project is used for comprehensively treating the domestic sewage in 735 key villages from 150 administrative villages of 1 street 10 town in the certain city, and the number of benefited households is 73144 households. The construction content comprises the following steps: the improvement of the septic tank of the peasant household; a village sewage collection and tail water discharge system is constructed; construction of rural sewage treatment facilities; and establishing a remote monitoring information system and repairing a broken road of the village.
The design of the sewage collecting pipe network is that a household collecting pipeline is designed according to a gravity flow pipeline, a sewage pipe in a residential toilet is a UPVC pipe, the minimum pipe diameter is d110mm, the minimum design gradient is 0.006, and a septic tank of the toilet is provided with a vent pipe which is generally higher than the upper opening of a window; the sewage pipe in the kitchen adopts white UPVC pipe, and minimum pipe diameter is d75mm, and the minimum design slope is 0.007. A ventilation cap is arranged at the trap of the outdoor kitchen pipe.
The sewage collecting branch pipes and the main pipes in the villages adopt UPVC pipes, the minimum pipe diameter is d160mm, and the minimum design gradient is 0.005; the sewage main pipe in the town adopts a double-wall corrugated pipe, and the minimum pipe diameter is d300 mm. The minimum design slope design principle is 0.002 for plastic tubing and 0.003 for other tubing. The pipe is preferably buried under a non-motor vehicle, and the minimum casing thickness of the pipe is determined according to external load, pipe strength, and the like. Under the motor vehicle lane, the distance is not less than 0.70 m; the thickness of the pipeline covering soil in the green belt or the courtyard can be reduced according to actual conditions, but is not lower than 0.40m and not higher than 0.15m above a soil freezing line.
In the aspect of the inspection well, a 400 multiplied by 400 square inspection well is used as a well for entering a household, residents in a concentrated residential area adopt three households and one well, scattered residents adopt one household and one well, and a main inspection well adopts
The inspection well interval of the d200 pipelines is not more than 25m, the inspection well interval of the d300 pipelines is not more than 30m, and the inspection well interval of the d400 pipelines is not more than 40 m. The inspection well configured in the pipeline system is preferably a high-quality finished product inspection well so as to ensure the construction quality of the pipeline and shorten the construction period, and the pipeline and the inspection well are preferably in a flexible connection mode.
Domestic sewage is collected through a sewage pipe network and is concentrated to a small centralized sewage treatment system. The sewage firstly passes through the basket grid to remove large granular substances, floating objects and the like in the sewage, and then automatically flows into the regulating tank to regulate the quality and quantity of the raw water. 2 lifting pumps are arranged in the adjusting tank, 1 device is used, and sewage is lifted to a biochemical treatment unit of a small centralized sewage treatment system under the control of a liquid level meter (a floating ball liquid level meter and a static pressure liquid level meter) in the tank. The biochemical treatment unit adopts A2The technology of the/O + MBBR technology. PP (polypropylene) phi 150 combined type suspension ball filler is placed in the tank A, and phi 25 multiplied by 10PE MBBR suspension filler is placed in the tank O. Adopts a disc type microporous aerator with phi 215mm and air flow of 1.5-3.0m3One, service area is more than or equal to 0.3m3The chassis and the supporting plate are made of ABS engineering plastics, the aeration membrane is ethylene propylene diene monomer or silica gel, and the quantity is determined according to specific scale and parameters. The air supply system adopts a diaphragm air pump. The supernatant fluid automatically flows to a disinfection device, a trichloroisocyanuric acid tablet with the diameter of 4cm and the content of 50 percent is placed in the device, and the trichloroisocyanuric acid tablet slowly releases to a disinfection part for sterilizationAnd (4) after treatment, discharging the treated water to a water outlet point after reaching the standard. If the tail water needs to be lifted and discharged, a tail water lifting system (comprising a sewage lifting pump and a liquid level meter) can be matched.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A rural domestic sewage collecting and treating system is characterized by comprising a single-household sewage user-connecting pipe system, a multi-household sewage user-connecting pipe system, a branch main pipe drainage system, a small centralized sewage treatment system and a clear water recycling and discharging system, wherein the single-household sewage user-connecting pipe system is used for collecting sewage of each farmer, the single-household sewage user-connecting pipe system of a plurality of farmers is communicated with the inlet end of the multi-household sewage user-connecting pipe system, user-connecting wells of the plurality of farmers are connected into an inspection well through pipelines, the outlet end of the multi-household sewage user-connecting pipe system is communicated with the small centralized sewage treatment system through the branch main pipe drainage system, the small centralized sewage treatment system comprises a biochemical treatment unit used for treating sewage, and the outlet end of the small centralized sewage treatment system is communicated with the clear water recycling and discharging system.
2. The rural domestic sewage collection and treatment system of claim 1, wherein the single household sewage receiving pipe system comprises a plurality of receiving pipes for collecting kitchen grey water, toilet grey water and septic tank black water, respectively, and a vent cap is provided at the front or rear part of the trap of the receiving pipe.
3. The rural domestic sewage collection and treatment system of claim 2, wherein the house service connection pipe of the kitchen and the toilet is a UPVC pipe with a pipe diameter De75, and the minimum gradient of the pipe is 8 per mill; a user connecting pipe of the septic tank in the toilet adopts a UPVC pipe with the pipe diameter De110, and the minimum gradient of the pipe is 6 per thousand.
4. The rural domestic sewage collection and treatment system of claim 2, wherein a cleaning opening is arranged at the inlet end of the house connecting pipe of the toilet, a water seal well is arranged at the inlet end of the house connecting pipe of the kitchen, and a basket type oil filter screen is arranged in the water seal well.
5. The rural domestic sewage collection and treatment system of claim 1, wherein the multi-family sewage service pipe system comprises a double-wall corrugated pipe having a ring stiffness of 8kN/m at a burial depth of less than 4.0m2Above, the ring stiffness is 10kN/m at a burial depth of 4.0-6.0m2The above.
6. The rural domestic sewage collection and treatment system of claim 1, wherein the small centralized sewage treatment system further comprises a regulating reservoir and an intelligent management and control system, the multi-family sewage home-service system is communicated with the inlet end of the regulating reservoir through a sewage lift pump, the outlet end of the regulating reservoir is communicated with the biochemical treatment unit, and the intelligent management and control system is connected with the sewage lift pump to control the sewage lift pump.
7. The rural domestic sewage collection and treatment system of claim 6, wherein a basket grid is arranged at the inlet end of the regulating tank, the grid gap of the basket grid is 8-12mm, and the width of the grid bars is 8-12 mm.
8. The rural domestic sewage collection and treatment system of claim 6, wherein a liquid level float and a static pressure liquid level meter are arranged in the regulating reservoir, the intelligent management and control system is connected with the static pressure liquid level meter to obtain the liquid level information of the regulating reservoir, the intelligent management and control system controls the sewage lift pump to be turned off when the regulating reservoir is at a high liquid level, and controls the sewage lift pump to be turned on when the regulating reservoir is at a low liquid level.
9. The rural domestic sewage harvest of claim 1The integrated processing system is characterized in that the biochemical processing unit adopts A2The process of the/O + MBBR, wherein the section A adopts spherical suspension packing, and the section O adopts MBBR packing.
10. A rural domestic sewage collection and treatment method, which is characterized in that the rural domestic sewage collection and treatment system of any one of claims 1 to 9 is adopted to collect and treat the farmer sewage.
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