CN100395193C - System of purifying landscape water body and operational method thereof - Google Patents
System of purifying landscape water body and operational method thereof Download PDFInfo
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- CN100395193C CN100395193C CNB2005100958702A CN200510095870A CN100395193C CN 100395193 C CN100395193 C CN 100395193C CN B2005100958702 A CNB2005100958702 A CN B2005100958702A CN 200510095870 A CN200510095870 A CN 200510095870A CN 100395193 C CN100395193 C CN 100395193C
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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
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Abstract
The present invention belongs to the field of landscape water purifying environment engineering and ecological engineering technology, and is especially one landscape water purifying technological system and its operation process. The landscape water purifying technological system consists of biofilters and artificial ecological shoreside wetland bands. The biofilters can eliminate organic pollutant, ammonia nitrogen, suspended solid, etc from sewage and needs no aerator. The artificial ecological shoreside wetland bands can eliminate suspended solids the rain water run-off carries and has plant growing to eliminate partial nutritious matter from water. The biofilters run to make water flow to form internal circulation, and the rain water can replenish water. The present invention has the features of obvious water purifying effect, low running cost, environment friendship, water saving, etc.
Description
Technical field
The invention belongs to the technology of the synergy purifying landscape water body that utilizes environment project and ecological engineering technology, particularly a kind of system of purifying landscape water body and method thereof.
Background technology
Along with the progressively raising of people's quality of life, also more and more higher to environment requirement.In the city, landscape water body has progressively been introduced the biotope; As landscape water body very important in the city tour Recreation area, its effect is also increasing.Landscape water body has been indispensable integral parts such as various parks, zoological park, biotope.
The status of landscape water body in the city becomes increasingly conspicuous, but landscape water body is faced with severe present situation: because city appearance water body mostly is the sealing unhurried current water body of static or mobile difference, water surface area is little, water environment capacity is little, water body self-purification ability is low, and (the endogenous pollution source is the domestic pollution of inner aquatic bird or ornamental animal etc. to make its vulnerable to pollution; The external source source of pollution comprise rainfall runoff, resident living sewage and rubbish etc.).Can cause body eutrophication when landscape water pollution is serious, cause algal bloom in the water, the water body blackening is fouled, the physical environment around the influence; In order to keep water quality, general landscape water cognition is regularly changed with tap water.The water quality deterioration and the water yield be wasteful to have become the difficult problem that the city appearance water body development faces.
Prevention and cure of pollution to landscape water body have at present had certain research, and the treatment process of city appearance water body mainly is environmental engineering and ecological engineering method: environmental engineering mainly is physico-chemical processes and biochemical process.Physico-chemical processes comprises (1) coagulant sedimentation, filtration method, dosing air supporting method; (2) sterilization and disinfection is and suppresses mushroom or algae grows in the water, adds a certain amount of inhibitor.Biochemical process comprises: (1) active sludge and microbial film are handled; (2) aeration aerating method is promptly carried out artificial aeration's reoxygenation to improve the dissolved oxygen content in the water to water body, makes it keep oxygen condition, prevents the generation of the black smelly phenomenon of water body.Ecological engineering mainly refers to aquatic attitude method, is guidance with the ecological principle, propagates the aquatic animal of antipollution and strong purification function artificially, forms aquatic ecosystem, and water quality is purified.
Environmental engineering processing efficiency height is subjected to seasonal effect little, but certain limitation is also arranged: generally need independent structures and power-equipment, need working cost; The environmental engineering facility has certain influence to view.Adopt physico-chemical process to handle (as sterilization) and may produce negative effect animals and plants in the water.Biochemical process is very effective to the dissolubility pollutant of removing in the water body, but may move difficulty owing to the landscape water pollution substrate concentration is relatively low.
The ecological engineering method has characteristics such as environmental friendliness, working cost be low, but its processing efficiency is low, is subjected to seasonal effect big, does not have removal effect substantially with the plant-growth initial stage in the winter time.
Independent environmental engineering and ecological engineering all are difficult to the effect that reaches satisfied when handling landscape water body, so environmental engineering and ecological engineering are combined, utilizing both advantage to handle landscape water body will be an important development direction for the treatment of landscape water body.
In environment project, filtration has the suspended substance removal in the water body effective, and equipment volume is little, power facility is simple, and operational management is convenient, and treat effluent influences characteristics such as little to the animals and plants in the water body.But the conventional filtration method does not have removal effect substantially to the dissolubility pollutant in the water body, and dissolubility pollutant can be accumulated in water body.The BAF system is the pollutent that utilizes in the biomembrance process treating water, and solvability and non-solubility pollutent are all had good removal effect, but needs aerator, and energy consumption is big, and operational management is complicated and noise is big.And the surface water body Pollutant levels are very low, and microorganism is difficult for growth, make that the BAF operation is difficult.
Summary of the invention
One of purpose of the present invention is to provide a kind of technological system of purifying landscape water body, for the landscape water body water treatment provides an efficient low-consume, approach that the supply water yield is few.
Another object of the present invention is to provide the method for a purifying landscape water body.
Biological filter tank in the technological system of purifying landscape water body of the present invention is that filtration is combined with biopurification, water intake mode and filtrate are improved, do not need aerator, but have the characteristics of BAF, the microorganism that grows on the filtrate can be removed the dissolubility pollutant in the water body.
Because the introducing of environmental engineering, the processing pressure of ecological engineering alleviates in native system, is mainly used in to handle rainfall runoff (studies show that: the pollutent of rainfall runoff mainly accumulates in the suspended particulate) and beautify the environment.The matrix of bank band is strengthened (selecting rubble, pebbles and the slag etc. of space for use) and formed bank band artificial ecology wetland, can strengthen the processing power of bank band and prolong working life than big and high adsorption capacity.
The present invention combines the technological system that forms purifying landscape water body with biological filter tank with bank band artificial ecology wetland, by the circular treatment of water, keep the cleaning of landscape water body.With the part supplementary feed of rainfall runoff as landscape water body, not only can reduce the working cost of landscape water body, can also reduce the pollution of non-point source to natural water; Considering landscape effect when design, make this system strengthen the leisure function of viewing and admiring of landscape water body when purifying water, is a technology with development prospect.
The technological system of purifying landscape water body of the present invention is combined by biological filter tank in environmental engineering unit and bank, ecological engineering unit band artificial ecology wetland, it is characterized in that:
The bank band of pool II in the landscape water body is made of artificial ecology wetland I, and the pool II in the landscape water body is connected with biological filter tank III by pipeline.
Bank band artificial ecology wetland is mainly handled the suspended solids in the rainfall runoff, and biological filter tank is handled the pollutent in the landscape water body.
Polluted water among the pool II in the landscape water body enters among the biological filter tank III after sump pump promotes, recycle after the Degradation purifying treatment of the microorganism that grows on process filtration and the filtrate; The plant-growth of bank band artificial ecology wetland I simultaneously also can be removed the part pollutent.Interception flows among the landscape water body II as supplementary feed after removing most suspended substances the rainfall runoff of hillside fields and road surface generation on every side through bank band artificial ecology wetland I.In the native system outside the backwashing water discharge system of biological filter tank III.In total system, only there is biological filter tank III to need lifting sewage water pump and backwash pump, in other zone, water is by gravity flowage.
Biological filter tank in the technological system of purifying landscape water body of the present invention mainly is made of unit such as filtrate, cloth pool, V-notch weir, filter plate, short-handled filter head, water inlet pipe, backwash tube, clear water collection tube, top cover, backwashing pump, sump pumps.
One filter plate is divided into filtrate district, following two districts, cloth pool with biological filter tank III; Filter plate is perforation plate (having aperture), in the through hole of filter plate short-handled filter head is installed; Cloth pool below filter plate is equipped with clear water collection tube, backwash tube; The filtrate district that adorns above filter plate is filled with filtrate, is installed on the sidewall of biological filter tank III at a V-notch weir above the filtrate, and a water inlet pipe is installed in the top of V-notch weir.
Top cover is arranged at the top of described biological filter tank III, is provided with the observation ventilation hole on top cover.
The water inlet pipe of described biological filter tank III links to each other with sump pump, and backwash tube links to each other with backwashing pump.The other end of clear water collection tube is connected with pool II in the landscape water body.
Filtrate adopts ceramic grain filter in the described biological filter tank III, water inlet pipe water outlet drop; Biological filter tank can be arranged to one or more parallel connection as required; Water after the partially disposed can be stored in the small-sized clean water basin, as backwash water.
Bank band artificial ecology wetland in the technological system of purifying landscape water body of the present invention is mainly by matrix, water distribution gallery, compositions such as emergent, waterplant.Between hillside fields and bank band, be provided with the water distribution gallery; Kind is implanted with emergent on matrix, and kind is implanted with waterplant in the shoaling water of landscape water body; Between bank band artificial ecology wetland and ballow, fence is set optionally.
Described bank band artificial ecology wetland matrix cobble and hard steel slag mainly big by voidage, high adsorption capacity are formed.
The method of the system purification landscape water body of purifying landscape water body of the present invention is:
Flow to matrix and emergent respectively through the rainfall runoff behind the band artificial ecology wetland I water distribution gallery of bank, water after interception is removed most suspended substances and removed the part pollutent enters among the pool II in the landscape water body as supplementary feed, and with landscape water body in pool II in landscape water body mix; Landscape water body enters among the biological filter tank III by pipeline, and after the degraded purifying treatment through the microorganism that grows on filtration among the biological filter tank III and the filtrate, cleaning water is returned among the pool II in the landscape water body; The backwashing water that is used for washing biological filter tank III filtrate is discharged to outside the system.
The method of the system purification landscape water body of purifying landscape water body of the present invention can be referring to Fig. 1～3:
After the rainfall runoff of hillside fields and road surface generation is on every side tackled the removal most suspended substances through bank band artificial ecology wetland I, flow to matrix 12 and emergent 15 after water distribution gallery 13 distribution through bank band artificial ecology wetland I, handle the back as among the pool II in the supplementary feed inflow landscape water body.Water level in the pool II in the landscape water body is lower, rainfall runoff hour, rainfall runoff enters after by matrix interception filtering particle pollutent among the pool II in the landscape water body; When big the or landscape water body median water level of rainfall runoff amount is higher mainly by emergent 15 interception suspended contaminant.
Water among the pool II in the landscape water body is through after the lifting of sump pump 10, fall among the biological filter tank III by water inlet pipe 6, handling the back through filtrate 1 is entered in the cloth pool 2 by short-handled filter head 5,7 collections flow back in the landscape water body and recycle through the clear water collection tube, and partially disposed water can be used as backwash water and is stored in the clean water basin.Clear water collection tube 8 and sump pump 11 are turned off in the back flushing after operation for some time of biological filter tank earlier during back flushing; Open backwashing pump 10 then, backwashing water can be taken to clean water basin, also can be from landscape water body directly extract near the entering mouthful for the treatment of water, backwashing water enters in the cloth pool 2 through back flushing perforated pipe 7, and rectification in cloth pool 2 is after enter filtrate district flushing filtrate by short-handled filter head 5; Backwashing water is discharged to outside the system after V-notch weir 3 is collected.Water in bank band artificial ecology wetland and the landscape water body mainly relies on the variation exchange material of rainfall runoff and landscape water body water level, and the pollutent in the landscape water body also can be partly removed in the growth of bank band artificial ecology wetland plant and the absorption of filtrate.
In whole process, only there is biological filter tank to need lift pump and backwash pump, in other zone, water is by gravity flowage.
System of the present invention utilizes biological filter tank to filter the suspended particulate contaminants of removing in the landscape water body, utilizes the microbiological deterioration dissolubility pollutant of growing on the biological filter tank filtrate; Utilize bank band artificial ecology wetland to cut down and enter the suspended particle that carries in the rainfall runoff of landscape water body, the growth of plant also can be removed part nutrition material in the water.In the technological system of described purifying landscape water body, biological filter tank operation makes that the immobilized water body flows originally, forms an internal recycle, and this biology filter tank volume is very little, and is simple to the auxiliary facility requirement, can a plurality of biological filter tank parallel runnings.The technological system of purifying landscape water body of the present invention utilizes rainfall runoff to be the external source make up water, reduces the lack of water supply water yield in season.The technological system of purifying landscape water body of the present invention is obvious to the water correction effect of landscape water body, it is stable that the run duration water quality of landscape water keeps, and wherein biological filter tank is handled back CODcr, TN, indexs such as TP, TSS reach national ground water environment quality standard (GB3838-88) III class standard; The only biological filter tank operation of system needs water pump and backwash pump, and running cost is low; During design environmental engineering and ecological engineering are combined with landscape design, native system is beautified the environment when purifying and improving water quality of landscape water.The present invention has characteristics such as effects of purification quality is remarkable, running cost is low, environmental friendliness, saving water resources.
The technological system of purifying landscape water body of the present invention has following advantage:
1, the technological system of purifying landscape water body of the present invention is with environmental engineering and ecological engineering combination, utilize the main body of biological filter tank as the landscape water body water treatment, utilize ecological engineering to handle rainfall runoff, have that treatment effect is good, energy consumption is lower, treatment effect is not subjected to advantages such as seasonal effect.
2, the technological system of purifying landscape water body of the present invention will be handled the back water circulation use, save water resources; Utilize rainfall runoff as the part supplementary feed, saved the tap water water consumption of landscape water body.
3, the technological system of purifying landscape water body of the present invention takes into full account the view factor when design, and environmental engineering and ecological engineering are incorporated in the view.Utilize the woods, the hiding environmental engineering equipment of thicket etc. the strong plant of bank band plantation sight, has been strengthened the leisure function of viewing and admiring of landscape water body.
4, native system is little to the particularly original animals and plants negative impact of ecosystem, environmental friendliness.
5, the biological filter tank in the technological system of purifying landscape water body of the present invention adopts measures such as inlet and drop and ceramic grain filter, make biological filter tank have the function of removing insoluble pollutent and dissolubility pollutant simultaneously, this biology filter tank does not need aerating system, has advantages such as energy consumption is low, noise is little; When biological filter tank designs, adopt the mode of a plurality of little filter tank parallel connections, reduced the instantaneous water consumption of biological filter tank back flushing, reduced of the requirement of biological filter tank auxiliary facility.
6, the bank band in the system of the present invention forms bank band artificial ecology wetland through strengthening, and has advantages such as processing power strong and working life of length; Emergent and the waterplant of viewing and admiring is suitable in selection, beautified environment.
Below in conjunction with drawings and Examples sewage disposal integral system of the present invention and method thereof are further described.
Description of drawings
Fig. 1. the system schematic of purifying landscape water body of the present invention.
Fig. 2. the biological filter tank synoptic diagram in the system of purifying landscape water body of the present invention.
Fig. 3. the bank band artificial ecology wetland synoptic diagram in the system of purifying landscape water body of the present invention.
Fig. 4. the case history synoptic diagram of the system of purifying landscape water body of the present invention.
Reference numeral
I. the biological filter tank of the pool III. in the bank band artificial ecology wetland II. landscape water body
1. filtrate 2. cloth pools 3. V-notch weirs
4. filter plate 5. short-handled filter heads 6. water inlet pipes
7. backwash tube 8. clear water collection tubes 9. top covers
10. backwashing pump 11. sump pumps 12. matrix
13. water distribution gallery 14. fences 15. emergents
16. waterplant
Embodiment
Embodiment 1:
See also Fig. 1.System of the present invention is combined by biological filter tank in environmental engineering unit and bank, ecological engineering unit band artificial ecology wetland.
The bank band of pool II in the landscape water body is made of the artificial ecology wetland I that handles suspended solids in the rainfall runoff, and the pool II in the landscape water body is connected with the biological filter tank III of pollutent in the processing landscape water body by pipeline.
Biological filter tank as shown in Figure 2, filtrate is a ceramic grain filter in the described biological filter tank; Bank band artificial ecology wetland as shown in Figure 3.Plant emergent on matrix, kind is implanted with waterplant 16 in the shoaling water of landscape water body; Between bank band artificial ecology wetland and ballow, be provided with fence 14.
With system of the present invention the water body of zoological park, Wuhan He Dao is handled.
Zoological park, Wuhan He Dao is one of important view in this zoological park, has put the ornamental bird (black Swan, grey crane, red-crowned crane, white mouth aigret, black stork, pelican etc.) of many preciousnesses in a suitable place to breed.Its landform synoptic diagram is as shown in Figure 4: aquatic bird perches district's total area and is about 2844m
2, the depth of water is 0.9m～2.0m, average depth is about about 1.3m～1.4m.There are island that supply birds to perch water body inside, and in the middle of the pool artificial hillock is arranged, and the two area is about 1107m
2, northern and eastern, western part is a water annulus, the pool that the south is perched for black Swan, and its water surface area is 1737m
2.The water annulus total length is about 123m.
Because adding and birds ight soil of feed, make pool water muddiness, the water quality and the sense organ in pool are relatively poor, the water quality basic parameter is as follows before the engineering: COD is that 60～80mg/l, TN are that 6～10mg/l, TP are growing in 0.5～2mg/l, the water a large amount of algaes and suspended substance, and the visibility meter of water is 0.15～0.30m.In order to improve water quality, the zoological park regularly replenishes tap water to He Dao, has wasted precious water resource.
Therefore, at the water quality condition of He Dao, adopted the technological system of purifying landscape water body of the present invention that the water body of He Dao is handled, four parallel runnings of biological filter tank.In view of lineament, the centre separates annular irrigation canals and ditches with a cement dike, and water is handled the back by water pump lifting and circulated along irrigation canals and ditches.The rainwater in hillside fields imports He Dao as supplementary feed all around.Through after engineered, source of pollution mainly comprise: (1) pollution of area source: mainly be rainfall runoff; (2) endogenous pollution: food residuum and movement on aquatic bird and the He Dao.
Consider the life of crane island birds, biological filter tank is placed on the bank of having a rest away from animal, and water pump is submerged in the water; The top cover of biological filter tank is designed to the pinnacle, and its profile is similar to a little wooden room, and appearance color is a grass green, and total system is covered and concealed in the woods.
Bank band artificial ecology wetland is made up of matrix and waterplant.Hypothallus is followed successively by from bottom to top: rubble, pebbles and slag, each layer matrix degree of depth is 30cm.The emergent of planting on the matrix mainly contains reed, cattail, calamus and water lily, in addition, and algae---the waterweed of on a section of bank band, having gone back artificial growth.
Rainfall runoff is handled back total suspended matter TSS through bank band artificial ecology wetland and is reduced to about 20～70mg/l from 100～200mg/l, and TN, TP are owing to the removal of TSS significantly reduces.
More biological filter tank Inlet and outlet water: water quality of landscape water COD maintains that 5～15mg/l, TN maintain that 0.4～1.0mg/l, TP maintain below the 0.1mg/l after sight water body water cycle purification techniques of the present invention and system handles, the turbidity of water is below 10NTU, visibility meter maintains 1.0～1.30m, has reached the III class standard of national ground water environment quality standard (GB3838-88); Biological filter tank water outlet can return to 5.0～6.2mg/l at 0.5～2.0mg/l in landscape water body.
System's stable back water quality of landscape water is good, keeps stable in run duration water quality.
Engineering operation more than a year, various growth of animal are good in the crane island.
The landscape water body water circulation of this research and the engineering Application Research of purification techniques and system are shown: this system's obvious processing effect, have the characteristics such as low energy consumption, environmental friendliness,
Claims (9)
1. the system of a purifying landscape water body is combined by biological filter tank in environmental engineering unit and bank, ecological engineering unit band artificial ecology wetland, it is characterized in that:
The bank band on the pool in the landscape water body (II) is made of the artificial ecology wetland (I) of handling suspended solids in the rainfall runoff, and the pool in the landscape water body (II) is connected with the biological filter tank (III) of pollutent in the processing landscape water body by pipeline.
2. system according to claim 1 is characterized in that: described biological filter tank (III) is one or more parallel connection.
3. system according to claim 1 and 2 is characterized in that: described biological filter tank (III) mainly is made of filtrate, cloth pool, V-notch weir, filter plate, short-handled filter head, water inlet pipe, backwash tube, clear water collection tube, top cover, backwashing pump, sump pump unit;
One filter plate is divided into filtrate district, following two districts, cloth pool with biological filter tank (III); Filter plate is a perforation plate, in the through hole of filter plate short-handled filter head is installed; Cloth pool below filter plate is equipped with clear water collection tube, backwash tube; The filtrate district that adorns above filter plate is filled with filtrate, is installed on the sidewall of biological filter tank (III) at a V-notch weir above the filtrate, and a water inlet pipe is installed in the top of V-notch weir.
4. system according to claim 1 and 2 is characterized in that: top cover is arranged at the top of described biological filter tank (III), is provided with the observation ventilation hole on top cover.
5. system according to claim 3 is characterized in that: top cover is arranged at the top of described biological filter tank (III), is provided with the observation ventilation hole on top cover.
6. system according to claim 3 is characterized in that: the water inlet pipe of described biological filter tank (III) links to each other with sump pump, and backwash tube links to each other with backwashing pump, and the other end of clear water collection tube is connected with the pool (II) in the landscape water body.
7. system according to claim 1 is characterized in that: described bank band artificial ecology wetland is mainly by matrix, the water distribution gallery, and emergent, waterplant constitute; Between hillside fields and bank band, be provided with the water distribution gallery; Kind is implanted with emergent on matrix, and the shoaling water kind of the pool in landscape water body (II) is implanted with waterplant.
8. system according to claim 7 is characterized in that: described matrix is big by voidage, rubble, pebbles and the slag of high adsorption capacity are formed.
9. method according to each described system purification landscape water body of claim 1～8 is characterized in that:
Flow to matrix and emergent respectively through the rainfall runoff behind bank band artificial ecology wetland (I) the water distribution gallery, water after interception is removed most suspended substances and removed the part pollutent enters in the pool (II) in the landscape water body as supplementary feed, and with landscape water body in the pool (II) in landscape water body mix; Landscape water body enters in the biological filter tank (III) by pipeline, and after the degraded purifying treatment through the microorganism that grows on filtration in biological filter tank (III) and the filtrate, cleaning water is returned in the pool (II) in the landscape water body; The backwashing water that is used for washing biological filter tank (III) filtrate is discharged to outside the system.
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| CNB2005100958702A CN100395193C (en) | 2005-09-06 | 2005-09-06 | System of purifying landscape water body and operational method thereof |
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| CNB2005100958702A CN100395193C (en) | 2005-09-06 | 2005-09-06 | System of purifying landscape water body and operational method thereof |
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| CN100395193C true CN100395193C (en) | 2008-06-18 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101962245B (en) * | 2009-06-12 | 2012-07-04 | 中国环境科学研究院 | Circulating flow gallery wetland process for treating high-concentration sewage and operation technique |
| CN102605853B (en) * | 2012-03-27 | 2014-04-02 | 苏州德华生态环境科技有限公司 | Facility for ecologically treating and recycling rainwater in central business district and method therefor |
| CN104098183B (en) * | 2014-07-31 | 2016-01-13 | 北京林业大学 | The system of rainwash water quality is improved by optimizing view |
| CN105645691B (en) * | 2016-02-25 | 2019-02-05 | 苏州市清泽环境技术有限公司 | Multifunctional ecological tree pond |
| CN112340936A (en) * | 2020-10-22 | 2021-02-09 | 广州荣翠园林绿化工程有限公司 | Landscape water body ecological system and construction method thereof |
| CN115991551A (en) * | 2022-10-13 | 2023-04-21 | 中国恩菲工程技术有限公司 | Landscape water body circulation purification simulation method and system |
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| US5174897A (en) * | 1991-09-24 | 1992-12-29 | The United States Of America As Represented By The Secretary Of Agriculture | Constructed wetlands to control nonpoint source pollution |
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| KR100449138B1 (en) * | 2003-12-18 | 2004-09-18 | (주)자연과환경 | Biofilter sewage treatment method using highly hydrophilic filter media |
| CN1635227A (en) * | 2005-01-13 | 2005-07-06 | 上海交通大学 | Integrated system for lakefront incipient rainwater collection, diffluence and ecological purification |
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| US5174897A (en) * | 1991-09-24 | 1992-12-29 | The United States Of America As Represented By The Secretary Of Agriculture | Constructed wetlands to control nonpoint source pollution |
| CN1446759A (en) * | 2003-04-18 | 2003-10-08 | 清华大学 | Compound wetland ecology method and system for controlling pollution of nitrogen and phosphor |
| KR100449138B1 (en) * | 2003-12-18 | 2004-09-18 | (주)자연과환경 | Biofilter sewage treatment method using highly hydrophilic filter media |
| CN1635227A (en) * | 2005-01-13 | 2005-07-06 | 上海交通大学 | Integrated system for lakefront incipient rainwater collection, diffluence and ecological purification |
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