CN102351378B - Method and system for processing rural sewage in artificial wetlands - Google Patents
Method and system for processing rural sewage in artificial wetlands Download PDFInfo
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Abstract
The invention discloses a method and a system for processing rural sewage in artificial wetlands. The method comprises the following steps: 1) processing life sewage into waste water through a multi-column septic tank; 2) letting the waste water enter into a grille well and a water collecting well to form mixed water; 3) letting the mixed water enter into a biofilter for removing organic matters from water through high efficiency microbial agents and biological filter material, then letting the mixed water pass through wetland plants for purifying and absorption to obtain living water; 4) letting the living water enter into the composite artificial wetland to further remove residual nitrogen and phosphorus compounds to form reclaimed water; and 5) letting the reclaimed water enter into an oxidation pond, and degrading and purifying the organic matters and nutriments in water through transformation of substance of multiple food chains in the oxidation pond, so as to form water which can be recycled or discharged reaching the standard finally. The multi-column septic tank of the system is respectively communicated with the grille well through the pipe network, and the outlet of the grille well is successively communicated with the water collecting well, the biofilter, the constructed wetland and the oxidation pond through pipelines. By processing with the unpowered biofilter, the sewage after being processed with the multi-column septic tank is processed with the system, so that the good operation processing effect, low operating cost and small investment are achieved.
Description
Technical field: the present invention discloses a kind of sewage water treatment method and system, particularly a kind of artificial wetland rural sewage treatment process and system.
Background technology: along with the development of China's economic society, the sustainable growth of population, impact and pollution on environment in the human being's production life process are more and more serious, the sanitary sewage in the vast rural area of current China just directly is thrown in rivers, pool, the lake without any processing, cause the pollution to the natural lake Natural Water, have a strong impact on the water surrounding of China's rivers and lakes as not adding to administer, so that people's life is caused disadvantageous effect.
Current, because people in the countryside are sparsely populated, quantity is larger, its sanitary sewage causes distribution looser because of actual cause, be not suitable for the concentrated pipe of receiving, water exhaust system and Sewage treatment systems are built imperfection, build and move as focusing on mode by existing sewage, its construction and running cost are all higher, being difficult to carry out, number is 201010201431.6 " Combined rural sewage treatment process and systems " such as Chinese patent application, and its treatment process is that waste water is processed through highly effective anaerobic reaction, many filler biologicals filtration treatment and Constructed Wetland For Purifying are processed, its system comprises grille well, efficient anaerobic pond, water pump, many filler biologicals trickling filter, second pond and artificial swamp etc.; Another Chinese patent application number is that 201010254858.2 " a kind of rural domestic sewage treatment system and treatment processs " comprise booth, in booth, plant plant, bio-reactor is installed at the middle part, and this reactor is connected with gas collector, and gas release device is established at the booth top; Above-mentioned two kinds of technical schemes all are improvement that existing country sewage is processed, but all there is following defective in they, the one, need the energy such as electric power as power, as with water pump, lifting sewage is processed, and to keep the operation of Sewage treatment systems, so also causes the maintenance operation cost all higher, and need maintenance, nurse; The sewage that the rural area gives off on the other hand, mostly go to toilet, the rice of making pottery is done the wash, shower waste, it is processed without the septic tank excrement, or after only processing through existing simple single grid septic tank excrement, directly enter grille well and process, this brings difficulty for the subsequent disposal of system, greatly affect the treatment effect of sewage, especially will move as power with the energy, because China's vast Rural areas distribution of rural settlement is wide, population is not concentrated, have high input so in advance, running cost is high again, and therefore, its this technique is difficult to be applied in the vast rural area of China.
Summary of the invention:Purpose of the present invention will provide a kind of artificial wetland rural sewage treatment process and system exactly, and it is take sun able person worker wetland as main, and unpowered bio-filter is processed, sewage is processed through system after many grid septic tanks are processed again, and its operation treatment effect is good, working cost is low, reduced investment.
A kind of artificial wetland rural sewage treatment process of technical scheme of the present invention, carry out as follows:
1) sanitary sewage is waste water first through many grid septic tanks anaerobically fermenting germicidal treatment;
2) waste water through above-mentioned processing enters into pump well formation mediation water after pipe network enters into grille well interception floating particle and impurity;
3) mediation water enters in the biological filter through high-effective microorganism microbial inoculum and biofilter material, to be in harmonious proportion complicated macromole in the water, insoluble organic matter is hydrolyzed to small molecules and dissolved organic matter, organism in the water and rich nutritive material are removed, then the wetland plant on the biological filter purifies the absorption organism again, forms running water;
4) running water of upper step formation enters into the combined artificial wetland that is implanted with wetland plant, and the natural, ecological purifying treatment is carried out in unrestricted flow, further except anhydrating middle residual nitrogen, phosphorus compound, water in the formation;
5) with 4) the middle water that forms of step enters into oxidation pond again, utilize the Substance Transformation of many food chains that waterplant in the oxidation pond, aquatic products and aquatic bird form to enter purifications of degrading of the organism in the water, nutrition on the pool in, become at last water recovery up to standard or discharge rivers.
The described sanitary sewage gravity flow of the inventive method enters into and forms waste water after many grid septic tanks are processed, waste water forms mediation water after the pipe network gravity flow enters grille well, pump well processing, the water gravity flow that is in harmonious proportion enters and forms running water after process the biological filter, water during the running water gravity flow enters and forms after artificial swamp is processed, the water gravity flow enters the oxidation pond natural purification in last, then forms water discharging up to standard or recovery.
The inventive method sanitary sewage is through many grid septic tanks anaerobically fermenting germicidal treatment, and the time is 30-60 days.
Sanitary sewage of the present invention is extremely qualified rear discharging or recovery of circular treatment in biological filter and artificial swamp.
A kind of artificial wetland rural sewage treatment system, be applied to above-mentioned artificial wetland rural sewage treatment process, many grid septic tanks of described system are communicated on the grille well respectively by pipe network separately, and the grille well outlet is by pipeline successively connected set well, biological filter, artificial swamp and oxidation pond; Described many grid septic tanks are three lattice ponds, by the adjacent intercommunication of siphunculus, are 2:1:3 by volume according to each pond size of water (flow) direction three lattice ponds between the three lattice ponds; Described biological filter comprises the second-stage treatment district of intercommunication, and a district is provided with the high-molecular biologic filler; Thick, thin two floor filtration bed and upper layer that two districts are provided with by coarse sand, gravel, zeolite, broken pottery sheet, large and small pebbles media assemblage are pedosphere, plant wetland plant on pedosphere and the artificial swamp; Plant water weeds in the described oxidation pond, aquatic and aquatic bird.
The described water weeds of system of the present invention or wetland plant are calamus, gladiolus, water lily, float greatly, Chinese scholartree leaf duckweed, reed, again power flower, wild rice stem, Herba Eichhorniae, floating heart, barnyard grass, black algae, hybrid giant napier; Described aquatic products is fish, shrimp, shellfish, spiral shell; Described aquatic bird is duck, goose.
Three-grid septic tank shape and structure of the present invention is " order ", " product ", " fourth " font, and its volume capacity is the reserves of sewage influx more than 60 days, and tank depth is greater than 1 meter.
Rural sewage treatment process of the present invention is as follows: each family sewage → many grid septic tank → pipe networks → grille well → pump well → biological filter → artificial swamp → oxidation pond → qualified discharge enters the river course.
Technical solution of the present invention compared with prior art has following beneficial effect:
The one, take sun able person worker wetland as main, in conjunction with the resolution of unpowered anaerobism and multifunctional bacterial filter, reach preferably treatment effect with lower running cost;
The 2nd, domestic sewage in rural areas by using enters into the unified system of grille well by pipe network more first and processes after too much the grid septic tank excrement is processed, sewage is after many grid septic tanks are processed, avoided a large amount of waste residue and the waste liquid of high density directly to enter into treatment system, improved processing power and the usefulness of system, and waste residue, liquid peasant household after the septic tank processing can clear up directly for farmland fertilization;
The 3rd, unpoweredization operation, maintenance operation is convenient, cost is low, especially in the vast rural area of China, equipment does not need the special messenger to nurse, the three-dimensional Ecological Disposal, breed fish in the water, shrimp, the water surface is supported aquatic bird, produces better economic benefit, and the water of discharging after testing reaches country's " urban wastewater treatment firm emissions standard " one-level (B) standard (GB18918-2002).
Description of drawings:
Fig. 1 is rural sewage treatment process synoptic diagram of the present invention;
Fig. 2 is embodiment of the invention three-grid septic tank 1 structural representation;
Among Fig. 1: 1. three-grid septic tank, 2. grille well, 3. pump well, 4. biological filter, 5. artificial swamp, 6. oxidation pond, 7. wetland plant, 8. high-molecular biologic filler, 9,10. large and small pebbles, 11. pedospheres, 12. water weeds, 13. fishes, 14. aquatic birds;
Among Fig. 2: 15 imports, 16 slag removing holes, 17 siphunculus, 18 outlets.
Embodiment: the present invention is described in further detail below in conjunction with specific embodiments and the drawings.
Embodiment is as shown in the figure: each family sanitary sewage of rural area is introduced in oneself three-grid septic tank 1 changes excrement, the anaerobically fermenting germicidal treatment, the general treatment time is 30-60 days, three-grid septic tank 1 according to current successively flow through the A of being followed successively by arranged sequentially, B, C its large and smallly be by volume 2:1:3; Collect through pipe network again and naturally flow into water that other need that enter of pump well 3 neutralizations process after entering into unified grille well 2 waste water that enters is tackled macrobead floating matter and impurity and concentrate and form mediation water, the water that is in harmonious proportion flows in the biological filter 4 naturally, biological filter 4 is provided with secondary level treatment zone, it separates with core wall, being positioned at the base, pond at core wall is equipped with pipe connecting two districts is communicated with, it is introduced into a district of biological filter 4, and filling high-molecular biologic filler 8 its specific surface areas reach 50000m in the district
2/ m
3The high-molecular biologic filler is the efficient carrier of anaerobion, form anaerobe band and unique high effective microbial community, the high-effective microorganism microbial inoculum of high effective microbial community preparation, the tool high efficiency, specific aim, flexibility characteristics, the water that is in harmonious proportion flow through from top to bottom high-molecular biologic filler 8 and biofilter material, it is under condition of free-dioxygen, by anaerobion and facultative microbe effect, with the complicated macromole in the waste water, insoluble hydrolysis of organic matter is small molecules, dissolved organic matter, most of organism and part nitrogen in the mediation water, the nutritive substances such as phosphorus namely are removed; Process laggard 4 another district that enters to the biological filter through this, another district is from bottom to top by greatly, pebble 9,10 or gravel form to filter bed and surface soil layer 11 consists of, be calamus at pedosphere 11 and artificial swamp 5 plantation wetland plants 7, wild rice stem, reed, Herba Eichhorniae, floating heart, barnyard grass, black algae, hybrid giant napier etc., this plant further absorbs the residual nitrogen in the mediation water, the nutritive substances such as phosphorus, forming at last running water enters in the artificial swamp 5, carrying out natural purification processes again, to residual nitrogen, phosphorus further absorbs water in the formation, middle water enters into oxidation pond 6, the water surface is implanted with water weeds 12 in oxidation pond 6, water weeds 12 can be selected plant such as the gladiolus identical with wetland plant 7, water lily, float greatly Chinese scholartree leaf duckweed, reed, power is spent again, wild rice stem, Herba Eichhorniae, floating heart, barnyard grass, black algae, hybrid giant napier etc.; Support aquatic products such as fish, shrimp etc. in the water; The water surface is supported aquatic bird 14, such as goose, duck etc.; So just form the stereo biological chain, thoroughly with few part nutritive substance in the middle water, nitrogen, phosphorus compound, organism purifies clean, makes at last water discharging up to standard.
The below is applied to Xinyu City sight nest town, Jiangxi rural domestic sewage treatment situation with technical solution of the present invention, and the invention will be further described.
Embodiment, the main raw table look-up
| Sequence number | Model and title | |
| 1 | 60 ° of crossing currents (XF) filler | 1.0m |
| 2 | Cobbles | Particle diameter 40-50mm |
| 3 | Pebble | Particle diameter 10-20mm |
| 4 | Pedosphere | |
| 5 | Auxiliary tubing and pipe fitting |
Main treatment process system specialization: as shown in Figure 1, 2
Three-grid septic tank 1: septic tank adopts brick mix structure, and appearance is coated waterproof mortar, is mainly used in the pre-treatment of waste water, reduces pollution load;
Pipe network: pipe network sewage dedicated pipe.The pipe of the Zhi Guanyong φ 150mm that draws from each family, main pipe line φ 300mm;
Biological filter 4: adopt the concrete structure, appearance is coated waterproof mortar.Mainly be to utilize biologic packing material wherein to increase surface-area, increase adhering to of biological bacteria, by the metabolic characteristic decomposing organic matter of microorganism.Sewage stops certain hour at this, and the organism that is beneficial in the sewage is fully degraded;
Artificial swamp 5: adopt the concrete structure, appearance is coated waterproof mortar, and artificial swamp combines physics, chemistry and three kinds of biological effects to the processing of waste water.After the wet land system maturation, filling surface and root system of plant will form microbial film owing to a large amount of microbial growths.Wastewater streams is when microbial film, and a large amount of SS is stopped by filler and root system of plant and hold back that organic pollutant then is removed by biomembranous absorption, assimilation and dissimilation.Because root system of plant discharges the transmission of oxygen, make to occur successively aerobic, anoxic, anaerobic state in the environment around it in the wet land system, thus by nitrated, denitrification with contaminant removal, the realization qualified discharge;
Oxidation pond 6: the distributing artificial marsh sewage treatment system compiles through sewage and enters oxidation pond 6, and oxidation pond 6 is effectively further purified liquid waste through self-purification capacities.
Sewage Treatment in Process Design and principal pollutant:
Septic tank is that three compartment septic tanks 1 are by the A that links, B, three ponds of C form, middle by crossing excrement siphunculus 17 UNICOMs, establish sewage import 15 in the A pond, establish wastewater outlet 18 on the C pond, simultaneously at A, establish slag removing hole 16 on the B pond, it mainly is to utilize anaerobically fermenting, the principle that excrement and parasitic ovum proportion are easy to precipitate greater than general mixed solution proportion is crossed in the middle level, ight soil decomposes through the fermentation more than 30 days in the pond, the middle level liquid manure flow to B by the A pond successively, the C pond, to reach precipitation or to kill the purpose of parasitic ovum and pathogen enterobacteria in the ight soil, C pond liquid manure becomes the high-quality chemical fertilizer.
To enter the first pond be the A pond to fresh excreta by advancing excrement import 15, in the pond ight soil begin fermentation decompose, because the different liquid manures of proportion can be divided into three layers naturally, the upper strata is pasty state excrement skin, lower floor be block or a shape excrement slag, the middle level is the liquid manure of relatively clarifying.In upper strata excrement skin and lower floor's excrement slag, contain bacterium and parasitic ovum is maximum, it is minimum that the middle level contains worm's ovum, the middle level liquid manure of initial fermentation is the B pond through manure through pipe siphunculus 17 overflow to the second ponds, and excrement skin and the excrement slag detention of major part without fully fermentation continued to ferment in the first pond.The liquid manure that flows into the second ChiBChi decomposition of further fermenting, worm's ovum continues to sink, and pathogenic agent is dead gradually, and liquid manure obtains further innoxious, and the excrement skin of generation and excrement Thickness Ratio the first ChiAChi significantly reduce.The liquid manure that flows into the 3rd pond and be the C pond generally becomes thoroughly decomposed, and wherein germ and parasitic ovum are killed substantially.The 3rd pond function mainly plays the substantially innoxious liquid manure effect of storage.
The underground part structure in three-grid septic tank 1 lavatory by closet, advance soil pipe, manure through pipe, three-grid septic tank, cover plate five parts and form.Closet adopts through type, and advances soil pipe and connects.
Three-grid septic tank 1: cast-in-place with brick cement flour wall or cement, prefabricated all can, take " order " font as main Types, or " product " font, " fourth " font, volume reached manure storage 60 days.Three lattice pond significant depths should be no less than 1m, take water (flow) direction from A, B to C three lattice volume size by volume ratio be 2:1:3;
The type brick mix structure
(H) m of size L * B * H=(0.8+1.0+0.4) * 0.6 * 1.2.
Biological filter 4, biological filter 4 comprises two districts, being provided with bed of packings provides attached growth of microorganisms required surface.Two district's media are large and small pebbles 9,10 or the synthetic plastics filler of gravel, wood strip and all kinds and shape.
Pool wall is used for depositing filler, holding the waste water of batching, and pool wall can be Steel Concrete.
Water distribution system must guarantee water distribution uniformity, makes all fillers can both be wetted.It will affect the operating performance in filter tank.
Filler not only provides bond area for microorganism, and the stay mechanism of microorganism in the unit also is provided.Organic matter removal is identical with other aerobic treatment processes with the nitrated mechanism of nitrogen in the filter tank.Dissolved organic matter is utilized as carbon source and the energy of heterotrophic bacteria by diffusing into the microbial film that is positioned at filling surface.Ammonia nitrogen is by diffusing into microbial film, and part is synthesized microbial biomass by heterotrophic bacteria, and remaining is become nitrate nitrogen by oxidation by nitrobacteria.Organism and nitrogen is nitrated to cause the biomass of adding, and has increased the thickness of biomass.Come off when microbial film is blocked up, the microbial film after coming off enters in the processed water outlet and discharges.Metabolism plays control action kou to Medium Diffusion to microbial film.
Fluid flow pattern in the filter tank is generally considered to be the pulling flow type with dispersivity.Because the apposition growth of this liquid state and microorganism, different types of microorganism is surviving on the filter bed different depths.The common oxidation of coal in filter bed top and nitrogen are nitrated to be occured simultaneously, and heterotrophic bacteria is dominant bacteria, and most of carbonaceous organic material is removed on the top of filter bed.And current are when the filter bed bottom, and the carbonaceous organic material major part is removed, and COD drops to below the 20mg/L, limited the growth of heterotrophic bacteria, ammonia-nitrogen content is relatively high in the water at this moment, and nitrifier becomes dominant bacteria, and in microbial film stable growth, finish the oxidation to nitre nitrogen.
Compiled by artificial swamp 5 water outlets and to enter oxidation pond 6.Oxidation pond 6 is a kind of half artificial ecosystems, and the principle that it is purified liquid waste and the purification mechanism of natural water area are quite similar.Water weeds 12 is arranged such as Herba Eichhorniae, floating heart, barnyard grass, black algae in oxidation pond 6 water surface kinds, and cultivation there are aquatic bird, duck; Support in the water fishes and shrimps are arranged; In the wetland plant 7 of artificial swamp 5 plantation as Herba Eichhorniae, floating heart, barnyard grass, deceive algae, hybrid giant napier and at oxidation pond 6, the water weeds 12 of water surface planting can be the same or different; Waste water is in oxidation pond 6 interior stop processes, and pollutent is through dilution precipitation, the oxygenizement of aerobic microbiological, or the Decomposition of anaerobion and removing or stabilization; By the stereo biological chain that forms, thoroughly with few part nutritive substance in the middle water, nitrogen, phosphorus compound, organism purifies clean, makes at last water discharging up to standard.
The source of sewage: mainly be that domestic sewage in rural areas by using is bathing, kitchen water, the water of doing washing, the water etc. that goes to toilet, principal pollutant are pH, CODcr, BOD
5, ammonia nitrogen, total phosphorus, total nitrogen, suspended substance etc.
Sewage effluent water quality is carried out the one-level B standard of GB18918-2002 " urban wastewater treatment firm pollutant emission standard " after administering:
| Project | CODcr | NH 3-N | SS | TN | TP | pH | BOD 5 |
| Unit | mg/L | mg/L | mg/L | mg/L | mg/L | - | mg/L |
| Emission standard | 60 | 15 | 20 | - | 0．5 | 6-9 | 20 |
The present invention administers sewage and shows that through environmental monitoring results indices all meets the requirements.
Result such as following table:
| Monitoring project | Monitoring result, concentration, mg/L, pH zero dimension (annual average) | Situation up to standard | Standard |
| pH | 8．24 | Up to standard | 6—9 |
| Chemical oxygen demand (COD) | 40．4 | Up to standard | 60 |
| Suspended substance | 14．7 | Up to standard | 20 |
| Total phosphorus | 0．423 | Up to standard | 0．5 |
| Five-day BOD | 6．43 | Up to standard | 20 |
| Ammonia nitrogen | 5．32 | Up to standard | 15 |
| Total nitrogen | 9．33 | Up to standard | 20 |
Claims (6)
1. artificial wetland rural sewage treatment process is characterized in that carrying out as follows:
1) sanitary sewage is waste water first through many grid septic tanks anaerobically fermenting germicidal treatment;
2) waste water through above-mentioned processing enters into pump well formation mediation water after pipe network enters into grille well interception floating particle and impurity;
3) mediation water enters in the biological filter through high-effective microorganism microbial inoculum and biofilter material, to be in harmonious proportion complicated macromole in the water, insoluble organic matter is hydrolyzed to small molecules and dissolved organic matter, organism in the water and rich nutritive material are removed, then the wetland plant on the biological filter purifies the absorption organism again, forms running water;
4) running water of upper step formation enters into the combined artificial wetland that is implanted with wetland plant, and the natural, ecological purifying treatment is carried out in unrestricted flow, further except anhydrating middle residual nitrogen, phosphorus compound, water in the formation;
5) with 4) the middle water that forms of step enters into oxidation pond again, utilize the Substance Transformation of many food chains that water weeds in the oxidation pond, aquatic products and aquatic bird form to enter purifications of degrading of the organism in the water, nutrition on the pool in, become at last water recovery up to standard or discharge rivers;
Described sanitary sewage gravity flow enters into and forms waste water after many grid septic tanks are processed, waste water forms mediation water after the pipe network gravity flow enters grille well, pump well processing, the water gravity flow that is in harmonious proportion enters and forms running water after process the biological filter, water during the running water gravity flow enters and forms after artificial swamp is processed, the water gravity flow enters the oxidation pond natural purification in last, then forms water discharging up to standard or recovery.
2. according to artificial wetland rural sewage treatment process claimed in claim 1, it is characterized in that sanitary sewage through many grid septic tanks anaerobically fermenting germicidal treatment, the time is 30-60 days.
3. according to artificial wetland rural sewage treatment process claimed in claim 1, it is characterized in that described sanitary sewage circular treatment in biological filter and artificial swamp.
4. artificial wetland rural sewage treatment system, be applied to artificial wetland rural sewage treatment process claimed in claim 1, the many grid septic tanks that it is characterized in that described system are communicated on the grille well respectively by pipe network separately, and the grille well outlet is by pipeline successively connected set well, biological filter, artificial swamp and oxidation pond; Described many grid septic tanks are three lattice ponds, by the adjacent intercommunication of siphunculus, are 2:1:3 by volume according to each pond size of water (flow) direction three lattice ponds between the three lattice ponds; Described biological filter comprises the second-stage treatment district of intercommunication, and a district is provided with the high-molecular biologic filler; Thick, thin two floor filtration bed and upper layer that two districts are provided with by coarse sand, gravel, zeolite, broken pottery sheet, large pebble media assemblage are pedosphere, plant wetland plant on pedosphere and the artificial swamp; Plant water weeds in the described oxidation pond, aquatic and aquatic bird.
5. according to artificial wetland rural sewage treatment system claimed in claim 4, it is characterized in that described water weeds or wetland plant be calamus, gladiolus, water lily, float greatly, Chinese scholartree leaf duckweed, reed, again power flower, wild rice stem, Herba Eichhorniae, floating heart, barnyard grass, deceive algae, hybrid giant napier; Described aquatic products is fish, shrimp, shellfish, spiral shell; Described aquatic bird is duck, goose.
6. according to artificial wetland rural sewage treatment system claimed in claim 5, it is characterized in that described three-grid septic tank shape and structure is " order ", " product ", " fourth " font, its volume capacity is the reserves of sewage influx more than 30 days, and tank depth is greater than 1 meter.
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| CN 201110193783 CN102351378B (en) | 2011-07-12 | 2011-07-12 | Method and system for processing rural sewage in artificial wetlands |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101215049A (en) * | 2008-01-15 | 2008-07-09 | 南京大学 | Ecotype coprocessing technique for country sewage and organic solid castoff |
| CN101948219A (en) * | 2010-09-09 | 2011-01-19 | 桂林理工大学 | Low-consumption biological treatment method of rural sewage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215049A (en) * | 2008-01-15 | 2008-07-09 | 南京大学 | Ecotype coprocessing technique for country sewage and organic solid castoff |
| CN101948219A (en) * | 2010-09-09 | 2011-01-19 | 桂林理工大学 | Low-consumption biological treatment method of rural sewage |
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