CN101973637A - River channel purification system for processing rural domestic sewage - Google Patents
River channel purification system for processing rural domestic sewage Download PDFInfo
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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
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- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a river channel purification system for processing rural domestic sewage, belonging to the field of rural sewage processing. The system is characterized in that a processing unit is established by utilizing a waste river channel or a swale near-natural type channel; a plant grid sedimentation unit, an artificial biomimetic material contact oxidation unit, a vertical current artificial wetland unit and a floating plant unit are successively arranged from top to bottom according to the direction of water flow; and the rural domestic sewage is processed successively through the four processing units so as to finally achieve the purpose of improving water quality. The system has the advantages that the removing rates of CODcr, SS, NH3-N, TN and TP of the domestic sewage entering the system respectively reach 77.1%, 84.1%, 70%, 68% and 58.8% through the application of the invention; the effect of reducing the pollution load and improving the water quality is realized; and the system provides the guarantee to the improvement of the water environment quality in a downstream river.
Description
Technical field
The present invention relates to a kind of rural area water pollution control system.Specifically, the present invention is a kind of river course purification system of handling domestic sewage in rural areas by using.
Background technology
According to measuring and calculating, rural area, the whole nation is annual to produce about more than 80 hundred million tons of sanitary sewage, and 96% village does not have discharge conduit and Sewage treatment systems, and sanitary sewage arbitrarily discharges, severe contamination the ecotope in rural area, directly threaten the Economic development in the vast farmers masses' healthy and rural area.
Domestic sewage in rural areas by using is mainly toilet-flushing sewage and laundry, washes rice, washes dish, waste water of bath.Mainly be life waste material and people's movement in the sewage, generally do not contain Toxic matter, often contain nutritive substances such as nitrogen, phosphorus, also have a large amount of bacteriums, virus and parasitic ovum.Because of the water quality and quantity of different domestic sewage in rural areas by using such as living habit, mode of life, economic level differs greatly, sewage has following characteristics and problem: (1) sewage distributes and disperses, coverage is wide, randomness is strong, prevent and treat very difficult, the pipe network gathering system is unsound, extensive discharging does not have sewage treatment facility substantially; (2) amount standard in rural water is lower, the little and variation factor big (3.5～5.0) of the discharge of sewage; (3) sewage complicated component, but the concentration of all contaminations is lower, and Biodegradability of Wastewater is stronger.
Because the life in the countryside source of pollution disperse, be difficult for concentrating, villages and small towns resident's environmental consciousness is poor, add that economic level is backward relatively, also there is big difficulty in the improvement, therefore, needs that development investment is economized, working cost is low, treatment effect is guaranteed, management maintenance Sewage treatment systems easily.At present more external countries are in domestic sewage in rural areas by using Processing Technology and application facet, many experiences have been accumulated, China should use for reference external experience, combine with the agricultural of locality, explore and improve the treatment process of various domestic sewage in rural areas by using, form reusing sewage and the ecological agricultural model that utilizes again, realize the innoxious and resource utilization of sewage.
(1) Australian " FILTER " Sewage treatment systems is a kind of " reuse system that filter, the soil processing combines with pipe drainage ", its purpose mainly is to utilize sewage to carry out crop irrigation, by irrigate land handle after, with underground hidden pipe it is compiled again and discharges.This system can satisfy the requirement of farm crop to moisture and nutrient on the one hand, reduces the content of elements such as nitrogen in the sewage, phosphorus simultaneously, makes it to reach sewage drainage standard.Be characterized in that filtered sewage all is pooled in the underground pipe drainage system, and be provided with water pump, the output that can control the above ground water table of closed drain and handle back sewage." FILTER " system is good to the treatment effect of sanitary sewage, and its working cost is low, is specially adapted to the area that land resources is abundant, can crop rotation lie fallow, or based on the area of planting forage grass.Shortcoming is that the pathogenic agent in the sewage may enter soil after the life-time service sewage irrigation, pollutes farm crop; Be subjected to the restriction of crop growing season, non-season of growth crop do not irrigate, Sewage treatment systems just can not be worked; The general cost of pipe drainage system is higher, if be used to handle the pumping plant that sanitary sewage also need be built the control water displacement, then cost is higher, has applied certain difficulty.
(2) a series of sewage disposal devices that are suitable for using in the rural urbanization have been studied by Japanese rural sewage disposal association.Designed 15 kinds of different model waste disposal plants of JARUS pattern, the treating processes that mainly adopts physics, chemistry to combine with biological control measure has obtained very good effect.The treatment unit of these 15 kinds of different models can be divided into two big classes.One class adopts biomembrance process, and the filtering layer that sewage is made by plastics is above with microorganism.By the biological oxygen demand (BOD) in the sewage is dropped to below the 20mg/L, suspended solids drops to below the 50mg/L, and total nitrogen content is below 20mg/L.Another kind of is to adopt the planktonic organism method, by swimming in the microbiological oxidation in the sewage, can make BOD drop to 10-20mg/ L, SS drops to 15-50mg/ L, COD drops to below the 15mg/L, and TN drops to below the 10-15mg/L, and TP drops to below the 1-3mg/L.Abroad to biomembranous theoretical investigation and practical application existing decades of history.The biomembrance process devices needed is simple, and energy consumption is low, and cost and maintenance cost are low, and the efficient height of disposing of sewage, it is a direction of Future Development.
(3) artificial wet land treating system generally is made up of artificial substratum (mostly being rubble) and growth marsh plants (reed, cattail, Rush and hemp etc.) thereon, it is " soil-plant-microorganism " ecosystem of a kind of uniqueness, utilize the acting in conjunction of each kind of plant, animal, microorganism and soil, filter step by step and absorb pollutants in sewage, reach the purpose of purifying waste water.This technology has obtained widespread use in countries such as Europe, North America, Australia and New Zealands, and its shortcoming is to need a large amount of soils, and the problems such as influence that will solve the abundant oxygen supply problem in soil and the water and be bullied gentle vegetation season.
(4) earthworm and ecological filter is to have according to earthworm to improve the soil aeration water permeability and promote the functions such as decomposition and inversion of organic substance to design, be a kind of pollution substance that both can efficiently, less energy-consumption remove in the town sewage, reduced the sewage treatment process of the novel concept of excess sludge processing and disposal costs again significantly.The ecological filter treatment system integrates preliminary sedimentation tank, aeration tank, second pond, mud backflow facility and oxygen supply facility etc., has simplified the sewage disposal flow process significantly; Operational management is simple and convenient, and can bear stronger impact load; Treatment system does not efflux excess sludge substantially, and its sludge yield is lower than conventional activated sludge process significantly; By the motion mediation of earthworm and the replicating microorganism of eating, solve the blockage problem that the traditional biological filter tank is run into.
(5) kapillary soil filtration treatment system is specially adapted to the incomplete area of sewage network, is a practical technique of handling the sewage that disperses discharging.The sewage that is transported to the diafiltration field is assigned to every diafiltration ditch through water distributor earlier, sewage in the diafiltration ditch is by the distribution again of gravel bed, rise to the roots of plants district under the effect of soil capillary, biochemical action of the physics by soil, chemistry, microorganism and the absorption of plant and utilization obtain handling and purifying.This system is stable, and reliable, capacity of resisting impact load is strong, to BOD
5, nitrogen, tp removal rate is big; Easy maintenance, initial cost is few, and working cost is low; Total system can not give an offensive smell underground, and ground surface lawn also can be beautified the environment; Intestinal bacteria clearance height; Processes such as the storage of sewage, conveying are all carried out underground, and thermosteresis is less, still can keep certain temperature in the winter time, keeps basic biochemical reaction, guarantees more stable removal effect.But its removal effect to total nitrogen is not remarkable; Floor space is big; Might polluted underground water.But because the life habit temperature influence of earthworm is obvious, be below or above certain temperature meeting hibernation or aestivation, so treatment effect is not very desirable when earthworm hibernation or aestivation, the filler in filter tank easily stops up.
Biological and Ecological Disposal technology is both at home and abroad to the normal main method that adopts of samll cities and towns' sewage disposal.Utilize biologic treating techniques such as active sludge, microbial film to exist to build and working cost height, denitrification process complexity, treatment effect are difficult to reach problems such as national surface water emission standard; Ecological Disposal technology good denitrification dephosphorization effect such as artificial swamp, oxidation pond, soil filtration, but exist floor space big, stench, easy shortcomings such as obstruction appear.Therefore, for realizing the mutual supplement with each other's advantages of biological and Ecological Disposal technology, development and use are strengthened pre-treatment-artificial swamp combination technique and are necessary.
Anaerobic reactor-artificial swamp combination process has now appearred, biological process-artificial swamp combination process, bio-oxidation pond-artificial swamp combination process, sand coarse aggregate ratio settling tank-technologies such as artificial swamp combination, these process combination mainly are in order to strengthen pre-treatment, and combine the high efficiency of artificial swamp Ecological Disposal, solve to take up an area of to a certain extent, stench, blocking problem occur.China Rural areas does not almost have the pipe network gathering system, and the population center relatively disperses, and economic level is lower, rural area cultivated land resource anxiety, however the network of waterways is densely covered, especially has more depleted stream, swag etc. before the village behind the house.Therefore, the selection depleted river course of suiting measures to local conditions, swag is admitted and handle sanitary sewage, and the equipment of developing is simple, be easy to manage, invest the low new village sanitary sewage disposal technology of working cost has realistic meaning.Research thinking of the present invention is to strengthen pre-treatment, adopt the littler catalytic oxidation biology of energy consumption, and increase intensified ecological clean unit improves water quality, admission processing country sewage in the depleted river course, development equipment is simple, be easy to management, the sewage disposal technology that working cost is low.
Summary of the invention
1. invent the technical problem that will solve: the purpose of this invention is to provide a kind of river course purification system of handling domestic sewage in rural areas by using.Utilize the depleted river course to adopt plant grid interception domestic sewage in rural areas by using, sewage is through processing unit strengthened purifications such as artificial bionic material contact-oxidation pool, vertical current constructed wetland and floating plants, can solve the pollution problem of domestic sewage in rural areas by using, effectively remove pollution substances such as organism in the sewage, nitrogen and phosphorus.
2. technical scheme
Principle of the present invention is as follows: according to the feature in original river course, by suitable transformation, plantation aquatic macrophyte (reed, cattail, wicker etc.), build up the plant grid, promptly the bigger floating matter of the volume in sanitary sewage or the rainwash, silt etc. are tackled, the part suspended matter is settled down.Enter contact-oxidation pool through the sewage after the sedimentation, this unit uses high-performance contact percolation material----biological rope, sewage contacts with biological rope and makes microorganic adhesion form microbial film on biological rope, makes the oxidized decomposition of organism in the waste water and reaches purification of water quality in the microorganism of biological rope surface attachment.Near the center of biological rope, because dissolved oxygen reduces, this quasi-microorganism can consume the nitrate nitrogen class in the water, thereby reaches the effect of denitrogenation.Sewage enters the vertical current constructed wetland unit more then, discharge because of the transmission of root system of plant in the wet land system oxygen, make and occur aerobic, anoxic, anaerobic state in the environment around it successively, guaranteed that the nitrogen phosphorus in the waste water can not only be by plant and microorganism as dietetic alimentation, but also can be removed by nitrated, denitrification, last wet land system changes filler or the harvesting serike is finally removed pollutent.At last, utilize floating plant further to improve water quality, can reduce the nutritive salt in the water, improve the eco-environmental quality in river, reach the effect of strengthened purification.
The present invention is achieved through the following technical solutions:
A kind of river course purification system of handling domestic sewage in rural areas by using, in the river course river flow velocity slowly (＜1m/s), utilize the nearly natural type of abandoned channel or bottom land river course to make up processing unit, set gradually plant grid sedimentation unit from top to bottom by water (flow) direction, catalytic oxidation unit, vertical current constructed wetland unit and floating plant unit.
(1) plant grid sedimentation unit
Plant grid sedimentation unit mainly utilizes physics sedimentation, adsorption, and biological absorption and microbiological deterioration.Plant aquatic macrophyte (reed in the river course after finishing, cattail, wicker etc.), build up the plant grid, promptly the bigger floating matter of the volume in sanitary sewage or the rainwash, silt etc. are tackled, the part suspended matter is settled down, can remove the nitrogen phosphorus in the rainwash again, and other organic pollutants.
(2) artificial bionic material catalytic oxidation unit
This unit uses high-performance contact percolation material----biological rope, biological rope is a kind of novel catalytic oxidation material, the main chemical fibre material that uses has: the hydrophilic man-made fiber of tool-----polypropylene fibre, even adhere to vinylon and nylon that a large amount of microorganisms also can keep rock steady structure, and the best materials such as polyvinylidene dichloride of recovery of elasticity effect.Biological rope can be stablized maintenance rate of propagation microorganism slowly, and as nitrifier and denitrifying bacteria, it is to continue but not concentrate to come off that the microorganism that adheres to simultaneously peels off, and the phenomenon of effluent quality can not occur influencing because of biofilm detachment.Utilization can also reduce the generating capacity of excess sludge attached to the efficient food chain on the biological rope.The advantage of bio-contact oxidation: operational management is easy, and the slow microorganism of rate of propagation can remain on the high density state, reduces the generation of excess sludge, and eliminate activity mud expands foamed phenomenon.
Biological rope is cord-like, and biological rope is fixed on the framework (bamboo or steel pipe) at two ends up and down, sets up standard to be 10cm at interval in length and breadth, and therefore, the installation of 1 cubic metre framework biological rope is 100m, after biological rope fixes, places in the river course.Sewage contacts with biological rope and makes microorganic adhesion form microbial film on biological rope, makes the oxidized decomposition of organism in the waste water and reaches purification of water quality in the microorganism of biological rope surface attachment.Near the center of biological rope, because dissolved oxygen reduces, this quasi-microorganism can consume the nitrate nitrogen class in the water, thereby reaches the effect of denitrogenation.
(3) vertical current constructed wetland unit
Artificial swamp combines physics, chemistry and three kinds of biological effects to the processing of waste water.Vertical flow pattern artificial swamp mainly is made up of 3 parts: matrix, plant and water distribution system.Artificial wet land system available matrix mainly contains the mixture of the one or more combination in soil, rubble, gravel, coal cinder, fine sand, coarse sand, cinder, porous medium (LECA), wollastonite and the trade waste at present.Matrix on the one hand provides medium for plant and microorganism growth, on the other hand by the direct removal pollutent of effects such as deposition, filtration and absorption.The plant of using in the vertical flow pattern artificial swamp mainly contains cattail, wild rice stem, reed, Herba Andrographis, Rush, Scirpus tabernaemontani, Canna generalis Bailey etc., these plants can increase the chance water-based of wetland matrix, can also form various subenvironments with the protozoon of surrounding environment, microorganism etc., oxygen is transferred to the root district, form special rhizosphere environment.This micro-ecological environment has the very strong ability of purifying liquid waste.
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.Effluent stream 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.Discharge because of the transmission of root system of plant in the wet land system oxygen, make and occur aerobic, anoxic, anaerobic state in the environment around it successively, guaranteed that the nitrogen phosphorus in the waste water can not only be by plant and microorganism as dietetic alimentation, but also can be removed by nitrated, denitrification, last wet land system changes filler or the harvesting serike is finally removed pollutent.
(4) floating plant clean unit
Floating plant is the plant of blade water surface floating life on the plant materials water in suspension or only, utilize it to purify water, not only can further absorb the nutritive salt in the water, water transparency is increased substantially, water-quality guideline also is improved simultaneously, particularly algae there is the good restraining effect, reaches the effect of strengthened purification.
3. beneficial effect
Invention provides a kind of river course purification system of handling domestic sewage in rural areas by using, and test-results shows that this invention is to COD
Cr, SS, NH
4-N, TN, TP clearance can reach 77.1%, 84.1%, 70%, 68%, 58.8% respectively, by the integrated use of above each technology, COD
Cr, TSS, NH
4-N, TN, TP content can reach the primary standard of the pollutant emission standard of urban wastewater treatment firm, can effectively improve sewage quality, for the downstream water body reduces pollution load pressure.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 arranges diagrammatic cross-section for the river course, wherein 1. water inlets, 2. plant grid, 3. catalytic oxidation biological ropes, 4. water inlet pipes, 5. barricades, 6. filling substrates, 7. communicating pipe, 8. wetland plants, 9. headers, 10. floating plants, 11. water outlets, the 12. river waters surface, 13. river bed;
Fig. 3 is a fixedly synoptic diagram of catalytic oxidation unit biological rope.3. catalytic oxidation biological ropes, 14. fixed supports wherein
Fig. 4 is an artificial swamp downstream tank sectional view, wherein 1. water inlet 5. waterwalls, 8. wetland plants (cattail, Canna generalis Bailey etc.) 11. water outlets, 15. mellow soil, 16. rubbles, 17. slags, 18. pebbless;
Fig. 5 is the up pond of an artificial swamp sectional view, wherein 1. water inlet 5. waterwalls, 8. wetland plants (cattail, Canna generalis Bailey etc.) 11. water outlets, 15. mellow soil, 16. rubbles, 17. slags, 18. pebbless.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing
With the river course, northern Suzhou is that example has been carried out experimental study, and this river course flow velocity is about 0.1 m/s ~ 0.3m/s, the main organism of the pollutent of admittance, nitrogen, phosphorus and suspended substance etc., typical domestic pollution type river course.In this river course, make up domestic sewage purification system, adopt plant grid sedimentations (plant grid sedimentation unit), artificial bionic material contact-oxidation pool (catalytic oxidation unit), vertical current constructed wetland (vertical current constructed wetland unit) and four processing units of floating plant (floating plant clean unit) are composed in series (see figure 1), core technology---artificial bionic material catalytic oxidation technology and vertical current constructed wetland technology, utilize biomimetic material absorption degradation microorganism, degradation of organic substances, vertical current constructed wetland is removed pollutents such as nitrogen phosphorus, need not aerating apparatus, can reduce the biological sewage treatment energy consumption significantly.
The river course of implementing engineering is about 1000m, goes up wide 8m, effective wide 2m of the water surface, depth of water 0.8m.Engineering sets gradually plant grid sedimentation unit 100m from about 500m place, disposal of pollutants source beginning of living, catalytic oxidation pool unit 10m, and vertical current constructed wetland unit 40m, floating plant clean unit 50m amounts to 200m, and effectively floor space is about 400m
2, structures floor space 100m
2Total system is handled the water yield and is about 285-450m
3/ d, hydraulic detention time are 17h-28h.Engineering is arranged and structure such as Fig. 2, Fig. 3, and Fig. 4, shown in Figure 5, particular content is as follows:
(1) the wide 2m of system element, long 200m, plant grid unit front end water inlet 1, floating plant clean unit water outlet 11.
(2) plant grid sedimentation unit: finishing river course, the effective water surface 12 wide about 2m, depth of water 0.8m, with the density of every interval 10-15cm in the river bed 13 kinds plant the emergent reed, as plant grid 2, be about 100m, mainly play interception, precipitation in the current particulate matter and the effect of silt.
(3) catalytic oxidation unit: with the up-stream face height is sea line, digs dark 0.5m downwards, and finishing sclerosis is built up long 10m, gone up wide 2m, wide 1.5m down, the trapezoidal channel of dark 1.5m.Select for use catalytic oxidation biological rope 3 to place in the trapezoidal channel, biological rope is PP+K-45, material: polypropylene+vinylon, specific surface area 1.6m
2/ m, proportion 1.24.Biological rope is cord-like, and biological rope is fixed on the framework 14 at two ends up and down, sets up standard to be 10cm at interval in length and breadth, and therefore, the installation of 1 cubic metre framework biological rope is 100m.The catalytic oxidation unit uses the about 2000m of biological rope, counts 20 cubic metres.Sewage contacts with biological rope and makes microorganic adhesion form microbial film on biological rope, makes the oxidized decomposition of organism in the waste water and reaches purification of water quality in the microorganism of biological rope surface attachment.
(4) vertical current constructed wetland unit: vertical current constructed wetland is in series by downstream pond and up stream pond, the volume in each pond is 2m * 1.5m * 0.8m, there is waterwall 5 to be separated by between two ponds, filling substrate 6 in the pond, be connected by communicating pipe 7 at the bottom of the two pond midfeathers, water distribution adopts water inlet pipe 4 multiple spots evenly to intake, header 9 water outlets, native system 10 the monomer ponds of connecting altogether.The downstream tank bottom is a layer of displacement, and filler is that 100mm is thick, the pebbles of particle diameter 40-80mm 18; The middle part adopts the thick slag of 300mm 17 to fill, slag is a blast-furnace slag, particle diameter 30-50mm, this packing quality of evidence is light, the particle quality is hard, and particle diameter is gradable, and it is neutral that its pH value of aqueous solution is, pollutent is had adsorption preferably, especially have very fast and adsorption efficiency preferably phosphorus; The rubble 16 of 100mm is adopted in the middle and upper part, mainly is limestone, and particle diameter is 10-30mm, and this part can prevent the water burst of wetland, and it is stable to keep wetland; Top covers the mellow soil 15 of 100mm, plantation wetland plant 8 cattails, Scirpus tabernaemontani, Canna generalis Bailey etc.Up stream pond filler is consistent with downstream pond filler, and the Inlet and outlet water direction is opposite.
(5) floating plant clean unit: the about 100m of floating plant 11 cellar areas
2By the selection Herba Eichhorniae, water peanut, floating heart, water caltrop four kind of plant are carried out indoor lab scale test, and the local sociales water peanut of evidence is best to the treatment effect of nitrogen phosphorus, therefore selects to plant water peanut.In the vertical current constructed wetland downstream, plantation length 50m, width covers the water peanut vegetation zone of whole river surface, absorbs the nutritive substance in the water body, improves water transparency, reaches the effect of strengthened purification.
The enforcement of engineering by experiment, COD in system's water outlet
Cr, SS, NH
4Pollutant levels such as-N, TN, TP significantly descend, and water quality is obviously improved, to COD
Cr, SS, NH
4-N, TN, TP clearance can reach 77.1%, 84.1%, 70%, 68%, 58.8% respectively.
System's Inlet and outlet water water monitoring data (mg/L) behind table 1 engineering construction
| Sample number into spectrum | PH | COD cr | SS | NH 3-N | TN | TP |
| Water inlet | 8.13 | 123 | 69 | 23.4 | 27.3? | 2.85? |
| Water outlet | 7.77 | 28.2 | 11 | 7.02 | 8.7? | 1.18? |
Claims (5)
1. river course purification system of handling domestic sewage in rural areas by using, river flow velocity＜1m/s in the river course, it is characterized in that utilizing the nearly natural type of abandoned channel or bottom land river course to make up processing unit, set gradually plant grid sedimentation unit from top to bottom by water (flow) direction, catalytic oxidation unit, vertical current constructed wetland unit and floating plant clean unit.
2. a kind of river course purification system of handling domestic sewage in rural areas by using according to claim 1 is characterized in that utilizing in the plant grid sedimentation unit plantation aquatic macrophyte reed, cattail or wicker to build up the plant grid.
3. a kind of river course purification system of handling domestic sewage in rural areas by using according to claim 2 is characterized in that being fixed with in the catalytic oxidation unit biomimetic material biological rope.
4. a kind of river course purification system of handling domestic sewage in rural areas by using according to claim 3, it is characterized in that the unitary matrix of vertical current constructed wetland is pebbles, slag, rubble, mellow soil from bottom to top, wetland plant is reed, cattail or Canna generalis Bailey, and water distribution manner is the multiple spot water distribution uniformity.
5. according to each described a kind of river course purifying treatment method of handling domestic sewage in rural areas by using in the claim 1～4, it is characterized in that river passes through following processing according to spontaneous current in the river course to successively:
(1) the plantation aquatic macrophyte is formed plant grid sedimentation unit in the river course, and floating matter and silt that the volume in sanitary sewage or the rainwash is bigger are tackled, and the part suspended matter is settled down;
(2) adopt high-performance contact percolation material----biomimetic material biological rope to be fixed in and constitute catalytic oxidation unit, the nitrogen in organism in the degradation of sewage and the removal sewage in the river course;
(3) build vertical current constructed wetland unit, the nitrogenous and phosphorated pollutent in disposing of sewage;
(4) adopt floating plant further to handle.
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