CN102503038B - Small anniversary composite system for purifying domestic sewage by using water hyacinth - Google Patents
Small anniversary composite system for purifying domestic sewage by using water hyacinth Download PDFInfo
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- CN102503038B CN102503038B CN2011103519045A CN201110351904A CN102503038B CN 102503038 B CN102503038 B CN 102503038B CN 2011103519045 A CN2011103519045 A CN 2011103519045A CN 201110351904 A CN201110351904 A CN 201110351904A CN 102503038 B CN102503038 B CN 102503038B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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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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Abstract
The invention discloses a small anniversary composite system for purifying domestic sewage by using water hyacinth. The system comprises a buffer tank, an aeration tank, an anaerobic fermentation tank, a water hyacinth culture tank, small artificial wetland, a methane tank and a green house; the aeration tank, the anaerobic fermentation tank, the water hyacinth culture tank, the small artificial wetland, and the methane tank are arranged in the green house; a heat supply pipe network is arranged below the green house; and the technical scheme of a comprehensive system integrated with municipal sewage treatment, methane production, phosphorus recycling, and heating and heat preservation solves the problems existing in the aspects of deep purification of municipal sewage, recycling of nutrient salt resources, treatment and recycling of wetland plant, and anniversary high-efficiency running of the system.
Description
Technical field
The present invention relates to one way of life sewage purification and harmless discharge system, also can be used as the advanced treatment of municipal sewage plant second-stage treatment discharging water outlet, specifically a kind of small-sized anniversary composite purification system that utilizes the Herba Eichhorniae purifying domestic sewage.
Background technology
Along with the sustainable development of urbanization progress, the city size Rapid Expansion, new samll cities and towns continue to bring out, and process to municipal wastewater and bring very hang-up.Some samll cities and towns are because small scale, and financial burden is large, are difficult to be covered by the sewage disposal pipe network, and it is commonplace that sanitary sewage arbitrarily enters the phenomenon in river course; Although large size city continues to increase input aspect sewage disposal, often only can reach to municipal wastewater the standard of second-stage treatment discharging, the advanced treatment of sewage is because technical requirements and cost are high, and still difficulty is popularized at present.According to national standard, in the sewage of municipal wastewater treatment plant second-stage treatment, still contain 0.5-1 mg L
-1Full phosphorus, 30 mg L
-1Nitrate, the content of nutritive substance is still higher.This present situation is brought very large threat to the aquatic ecosystem of China's fragility.
Because China's size of population is large, Residential concentration is large to the pressure of environment, and is so that the environmental capacity of aquatic ecosystem is little, responsive to the input ratio with nutrient essence such as the materials such as N, P.It is reported that in the lake, content of tatal phosphorus reaches 0.05 mg L
-1Just be enough to cause the outburst of wawter bloom.According to the statistics of national environmental protection section, the adjacent small-sized lake pollution in China and cities and towns is serious, and the water quality such as large-size lake such as Dian Chi, Taihu Lake also allow of no optimist, and the lake eutrophication area still has increase trend.The water quality deterioration in these lakes brings threat for local Water resources security, algal bloom even generate a panic for some regional Drinking water supplies.
Municipal wastewaters high for the advanced treatment technology of municipal wastewater second-stage treatment plant effluent and cost requirement, samll cities and towns are processed difficult problem, carried out a large amount of research both at home and abroad, wherein, Artificial Wetland Techniques is considered to a kind of low cost, efficient municipal wastewater treatment system, and united state is recommended.Limit the very large reason that this technology popularizes and be, this technology mainly relies on the nitrogen of the effect of wetland plant and soil microorganisms in purifying waste water, and by plant absorbing and precipitating action dephosphorization, these processes depend on the local climate condition; In addition, for surperficial flow pattern artificial swamp, easily grow the problems such as mosquitos and flies; And for subsurface constructed wetland, then easily cause stopping up.China has also carried out a large amount of research aspect artificial swamp, and some exemplary artificial wet land systems have been set up, and once to the floating material carrying of floating bed technology-a kind of utilization plant, make floating plant at the sewage water surface, utilize a large amount of research of the absorption of plant and the technology of root table microbially decontaminate sewage-carried out, above problem is had overcoming to a certain degree, but, how to overcome the restriction of weather condition, improve the purification efficiency aspect of wet land system, still report is less.Municipal wastewater purification system anniversary operating performance based on wetland technology is poor, and efficient is low.On the other hand, the growth of wetland plant is the efficient important mechanisms of removing of nutritive salt in the sewage, therefore how to process the wetland plant body of raised growth results, also is a large factor of restriction wet land system.China investigator attempts to draw municipal wastewater as the water planting nutrition source by utilizing cash crop water planting pattern, realizes that purification and the resource utilization of sewage combines, and solves the problem of wetland plant body how to process the raised growth results.Wherein, what be widely adopted mainly is rye grass, and still, agricultural-food take municipal wastewater as nutrition source water planting supply market even there is not the pollutent problem that exceeds standard, often also is difficult to accept on consumer psychology, and this approach is not really walked logical.Terrestrial plant is with respect to the deficiency of aquatic plants growth amount, also so that terrestrial plant is not so good as waterplant aspect processing efficiency.And wetland plant is especially such as Herba Eichhorniae, these plants of water lettuce, low to the nutrient concentration demand, growth is that plant is removed in a kind of desirable nutritive salt absorption rapidly, but also just because growth is rapid, plant materials is processed difficult, and more worry flows into environment and had a mind to avoid by people.Therefore, popularizing of Artificial Wetland Techniques is subjected to the impact of two technical barriers to a great extent: how 1 overcome the weather condition restriction in low temperature season such as late autumn, early spring, winter; How 2 overcome the wetland plant body is processed a difficult problem.
Municipal wastewater is rich in the nutritive salt this point and is concerned by people always, yet, because the popularizing of cities and towns bathroom facility, even so that in the municipal wastewater harmful substance contents very low, also because nutrient concentration is excessively low, agricultural value is little, and is difficult to really be used by agriculture field.Domestic and international recovery for phosphorus element in the municipal secondary treatment process, carried out large quantity research, wherein reclaim the phosphorus element by producing struvite, set up in theory technological line, the success of the experimental scale that succeeds, but at the lower municipal secondary effluent of relative concentration, reach the recovery aspect of common Phosphorus in Domestic Wastewater with Pulverized element to how, do not report at present.The phosphorus of this class sewage reclaims, and can adopt in theory anionite-exchange resin to carry out, but often has any problem on cost, and this also is the difficult reason of popularizing of municipal tertiary treatment.
In sum, at present aspect the municipal wastewater processing, especially the deep purifying problem of municipal sewage plant's second-stage treatment, not by the aspects such as resource utilization recovery of nutritive salt in the sanitary sewage disposal of municipal wastewater pipe network coverage area, the sewage, lack economic and technical all feasible technical solution schemes.
Summary of the invention
Technical problem to be solved by this invention provides a kind of small-sized anniversary composite purification system that utilizes the Herba Eichhorniae purifying domestic sewage, fairground political affairs sewage disposal, biogas production, phosphorus reclaim, the technical scheme of heat tracing system synthesis system, to solve the problem of the aspects such as municipal wastewater deep purifying, the recovery of nutritive salt resource, wetland plant processing and resource utilization, the efficient operation of system's anniversary.
The present invention solves the problems of the technologies described above the technical scheme that adopts to be: a kind of small-sized anniversary composite purification system that utilizes the Herba Eichhorniae purifying domestic sewage, this system comprises Buffer Pool, aeration tank, anaerobically fermenting pond, Herba Eichhorniae culturing pool, small-scale artificial wetland, methane-generating pit and Wen Peng, aeration tank, anaerobically fermenting pond, Herba Eichhorniae culturing pool, small-scale artificial wetland, methane-generating pit are arranged in the warm canopy, and warm canopy below is provided with heating network; Described small-scale artificial wetland is planted mater convolvulus take 0.5-1 mm limestone particle as matrix on it;
Sewage in the Buffer Pool is introduced in the aeration tank by pipe network after regulating by PH, behind precipitable thing in the aeration tank removal sewage and the floating matter sewage is passed in the anaerobically fermenting pond, anaerobically fermenting and denitrogenation are carried out to sewage in the anaerobically fermenting pond, the sewage that discharge in the anaerobically fermenting pond flow through successively Herba Eichhorniae culturing pool and small-scale artificial wetland, behind the element of the phosphorus in the decontaminated water, nitrate and impurity, discharging enters network of waterways system;
Herba Eichhorniae in the Herba Eichhorniae culturing pool and the mater convolvulus of small-scale artificial wetland are sent in the methane-generating pit and ferment, the natural pond liquid that produces in the methane-generating pit passes in the phosphorus element recycling module that lime and Tai-Ace S 150 flocculation agent are housed, the biogas that methane-generating pit produces passes into fires hot water boiler, fire the hot water that hot water boiler fires and pass into heating network, the heat that heating network produces offers warm canopy.
The escape pipe of described methane-generating pit is connected with the gas combustion apparatus of production lighting system.
The invention has the beneficial effects as follows:
1, a kind of municipal wastewater treatment system of low-consumption high-efficiency is provided, had both can be used for the advanced treatment of municipal wastewater secondary treatment yielding water, also can be used as the sewage disposal of not yet including municipal wastewater pipe network area in; This systems technology requirement is low, cost is low, is beneficial to popularization.
2, the phosphorus, nitrate and the impurity that contain in the sewage of system to second-stage treatment are thoroughly processed, and prevent the water circulation system burden.
3, this system can resist the unfavourable weather condition influence, realizes the anniversary high-efficient operation, guarantees the temperature-stable of whole system, has the characteristics of artificial swamp, and operational management is with low cost, and has overcome the deficiency of Traditional Man wetland.
4, integrate the functions such as sewage disposal, nutritive salt enrichment and resource utilization recovery, biogas production, make to greatest extent sewage recycling, innoxious.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of temperature canopy of the present invention and heating network;
1, Buffer Pool, 201, the aeration tank, 202, detest foster fermentation vat, 301, the Herba Eichhorniae culturing pool, 302, small-scale artificial wetland, 401, methane-generating pit, 402, the production lighting system, 501, Wen Peng, 502, heating network, 503, fire hot water boiler, 6, phosphorus element recycling module.
Embodiment
As shown in the figure, a kind of small-sized anniversary composite purification system that utilizes the Herba Eichhorniae purifying domestic sewage, this system comprises Buffer Pool 1, aeration tank 201, anaerobically fermenting pond 202, Herba Eichhorniae culturing pool 301, small-scale artificial wetland 302, methane-generating pit 401 and warm canopy 501, aeration tank 201, anaerobically fermenting pond 202, Herba Eichhorniae culturing pool 301, small-scale artificial wetland 302, methane-generating pit 401 are arranged in the warm canopy 501, and warm canopy 501 belows are provided with heating network 502; Described small-scale artificial wetland 302 is planted mater convolvulus take 0.5-1 mm limestone particle as matrix on it;
Sewage in the Buffer Pool 1 is introduced in the aeration tank 201 by pipe network after regulating by PH, behind precipitable thing in the 201 removal sewage of aeration tank and the floating matter sewage is passed in the anaerobically fermenting pond 202, the 202 pairs of sewage in anaerobically fermenting pond carry out anaerobically fermenting and denitrogenation, the sewage that discharge in anaerobically fermenting pond 202 flow through successively Herba Eichhorniae culturing pool 301 and small-scale artificial wetland 302, behind the element of the phosphorus in the decontaminated water, nitrate and impurity, discharging enters network of waterways system;
Herba Eichhorniae in the Herba Eichhorniae culturing pool 301 and the mater convolvulus of small-scale artificial wetland 302 are sent in the methane-generating pit 401 and ferment, the natural pond liquid of methane-generating pit 401 interior generations passes in the phosphorus element recycling module 6 that lime and Tai-Ace S 150 flocculation agent are housed, the biogas that methane-generating pit 401 produces passes into fires hot water boiler 503, fire the hot water that hot water boiler 503 fires and pass into heating network 502, the heat that heating network 502 produces offers warm canopy 501.
The escape pipe of described methane-generating pit 401 is connected with the gas combustion apparatus of production lighting system 402.
Buffer module mainly is made of Buffer Pool, is mainly used in receiving the municipal wastewater that the municipal wastewater pipe network is carried, and sewage pH is regulated, and plays simultaneously the effect of a settling tank, to remove precipitable thing and the floating matter in the sewage; The Buffer Pool degree of depth is 1.5 m, and length and width are according to the size design of coverage.
The traditional wastewater processing module is comprised of aeration tank and anaerobically fermenting pond, and the oxygen consumption that the aeration tank is mainly used in pollutent decomposes; Anaerobic pond then mainly carries out anaerobically fermenting and denitrogenation, and it designs with reference to the traditional wastewater treatment technology; This module mainly adopts in the area that lacks sewage work.
Artificial swamp Combined Processing module comprises that mainly Herba Eichhorniae culturing pool and small-sized subsurface constructed wetland form, and the Herba Eichhorniae culturing pool degree of depth is 50 cm, width 3 m, and length is specifically determined as required, is used for putting in a suitable place to breed Herba Eichhorniae; Small-sized subsurface constructed wetland is take 0.5-1 mm limestone particle as matrix, and plantation mater convolvulus mainly plays the controlled filter effect at this on it, and part phosphorus residual after processing with the elimination culturing pool is plain, and some impurity; The water outlet that artificial swamp is finished dealing with can enter network of waterways system by safety dumping; The mater convolvulus of gathering in the crops on the wetland can be sent into marsh gas fermentation pool.
The biogas fermentation module mainly is made of methane-generating pit and production lighting system, and the plant of gathering on the Herba Eichhorniae culturing pool that acceptance comes and the small-scale artificial wetland is fermented, and produces biogas; The biogas that produces can supply illumination, near resident living combustion gas, and system self need the heat insulation energy; The biogas fermentation technology of its concrete Technical Reference maturation.
Heat supply and heat preservation module mainly are comprised of warm canopy, heating network, and warm canopy is double layer plastic greenhouse, and structure is consistent with plastic tent for growing vegetable, mainly plays the effect of insulation; Heating network is the heating pipe network that is distributed under the whole temperature canopy, and by the boiler supplying hot water take biogas as combustion gas, and the temperature, water temperature etc. of keeping low temperature season are not less than 20 ℃, avoid the generation of freeze injury.
Phosphorus element recycling module is mainly used in accepting the recovery problem of phosphorus element in the natural pond liquid of methane-generating pit output, after receiving biogas digested liquor of biogas generating pit, drops into lime in the liquid of natural pond regulating about pH to 7, and drops into Tai-Ace S 150 as flocculation agent, and it is plain to make concentrated phosphorus through precipitation.
Combination and method of attachment between each module component are as follows: the sewage of at first being collected by the municipal wastewater pipe network system is input to Buffer Pool, through pH regulator, waits pending; Sewage in the Buffer Pool is introduced the aeration tank by pipe network, accelerates the decomposition of aerobic substance in the sewage through Air Exposure, and impels the ammonium root to be converted into nitrate radical; The anaerobically fermenting pond is introduced in water outlet after process the aeration tank, with further removal aerobic substance, and the denitrogenation of promotion nitrate radical; The Herba Eichhorniae culturing pool is introduced in the water outlet of anaerobically fermenting pond, and in culturing pool, the nutritive salt in the water is absorbed by Herba Eichhorniae, and the impurity in the water is adsorbable on the root system of Herba Eichhorniae, accelerate decomposition mineralising, the then precipitation removal in this pond of precipitable thing; Often content is very low for aerobic substance and nitrogen in the water outlet of Herba Eichhorniae culturing pool, and the phosphorus element is often higher, sometimes may be higher than 0.5 mg L
-1This level, so its water outlet further introduces small-scale artificial wetland and process, the nutritive salt in this water by mater convolvulus further absorb, the further Adsorption of Wetland Substrate; The plant materials of gathering in the crops on Herba Eichhorniae culturing pool and the artificial swamp is sent into methane-generating pit, and the biogas part that fermentation produces gives over to system's heat supply usefulness, and another part can be used as the contiguous resident's of output supply combustion gas and illumination; Be rich in nutritive substance in the slag of natural pond, can be used as agricultural fertilizer; Natural pond liquid in the methane-generating pit also can be used as agricultural, but considers its inconvenience transportation, therefore introduces the dephosphorization settling tank, at first regulates pH with lime here, further precipitates phosphorus in the liquid of natural pond with the Tai-Ace S 150 flocculation agent at last, carries out enriching and recovering; In this treating processes, the systems such as methane-generating pit, anaerobically fermenting pond, Herba Eichhorniae culturing pool, small-scale artificial wetland, methane-generating pit, dephosphorization settling tank are all concentrated build in the large-scale temperature canopy, its lower heating network system that arranges, be that the boiler of combustion gas is unified heat supply and is incubated by the biogas of the methane-generating pit that draws, to move in the safeguards system anniversary.
Specific implementation method:
1, the advanced treatment of municipal wastewater treatment plant secondary treatment yielding water: draw municipal wastewater treatment plant secondary effluent and enter Buffer Pool, through pH regulator, wait pending; The Herba Eichhorniae culturing pool is introduced in the Buffer Pool water outlet, and in culturing pool, the nutritive salt in the water is absorbed by Herba Eichhorniae, and the impurity in the water is adsorbable on the root system of Herba Eichhorniae, accelerate decomposition mineralising, the then precipitation removal in this pond of precipitable thing; Often content is very low for aerobic substance and nitrogen in the water that the Herba Eichhorniae culturing pool is discharged, and the phosphorus element is often higher, sometimes may be higher than 0.5 mg L
-1This level, so its water outlet further introduces small-scale artificial wetland and process, the nutritive salt in this water by mater convolvulus further absorb, the further Adsorption of Wetland Substrate; The plant materials of gathering in the crops on Herba Eichhorniae culturing pool and the artificial swamp is sent into methane-generating pit, and the biogas part that fermentation produces gives over to system's heat supply usefulness, and another part can be used as the contiguous resident's of output supply combustion gas and illumination; Be rich in nutritive substance in the slag of natural pond, can be used as agricultural fertilizer; Natural pond liquid in the methane-generating pit also can be used as agricultural, but considers its inconvenience transportation, therefore introduces the dephosphorization settling tank, at first regulates pH with lime here, further precipitates phosphorus in the liquid of natural pond with the Tai-Ace S 150 flocculation agent at last, carries out enriching and recovering; In this treating processes, the systems such as methane-generating pit, anaerobically fermenting pond, Herba Eichhorniae culturing pool, small-scale artificial wetland, methane-generating pit, dephosphorization settling tank are all concentrated build in the large-scale temperature canopy, its lower heating network system that arranges, be that the boiler of combustion gas is unified heat supply and is incubated by the biogas of the methane-generating pit that draws, to move in the safeguards system anniversary.
2, not by the processing of municipal wastewater treatment system coverage area sanitary sewage: the sewage of at first being collected by the municipal wastewater pipe network system is input to Buffer Pool, through pH regulator, waits pending; Sewage in the Buffer Pool is introduced the aeration tank by pipe network, accelerates the decomposition of aerobic substance in the sewage through Air Exposure, and impels the ammonium root to be converted into nitrate radical; The anaerobically fermenting pond is introduced in water outlet after process the aeration tank, with further removal aerobic substance, and the denitrogenation of promotion nitrate radical; The Herba Eichhorniae culturing pool is introduced in the water outlet of anaerobically fermenting pond, and in culturing pool, the nutritive salt in the water is absorbed by Herba Eichhorniae, and the impurity in the water is adsorbable on the root system of Herba Eichhorniae, accelerate decomposition mineralising, the then precipitation removal in this pond of precipitable thing; Often content is very low for aerobic substance and nitrogen in the water that the Herba Eichhorniae culturing pool is discharged, and the phosphorus element is often higher, sometimes may be higher than 0.5 mg L
-1This level, so its water outlet further introduces small-scale artificial wetland and process, the nutritive salt in this water by mater convolvulus further absorb, the further Adsorption of Wetland Substrate; The plant materials of gathering in the crops on Herba Eichhorniae culturing pool and the artificial swamp is sent into methane-generating pit, and the biogas part that fermentation produces gives over to system's heat supply usefulness, and another part can be used as the contiguous resident's of output supply combustion gas and illumination; Be rich in nutritive substance in the slag of natural pond, can be used as agricultural fertilizer; Natural pond liquid in the methane-generating pit also can be used as agricultural, but considers its inconvenience transportation, therefore introduces the dephosphorization settling tank, at first regulates pH with lime here, further precipitates phosphorus in the liquid of natural pond with the Tai-Ace S 150 flocculation agent at last, carries out enriching and recovering; In this treating processes, the systems such as methane-generating pit, anaerobically fermenting pond, Herba Eichhorniae culturing pool, small-scale artificial wetland, methane-generating pit, dephosphorization settling tank are all concentrated build in the large-scale temperature canopy, its lower heating network system that arranges, be that the boiler of combustion gas is unified heat supply and is incubated by the biogas of the methane-generating pit that draws, to move in the safeguards system anniversary.
Claims (2)
1. small-sized anniversary composite purification system that utilizes the Herba Eichhorniae purifying domestic sewage, it is characterized in that: this system comprises Buffer Pool (1), aeration tank (201), anaerobically fermenting pond (202), Herba Eichhorniae culturing pool (301), small-scale artificial wetland (302), methane-generating pit (401) He Wenpeng (501), aeration tank (201), anaerobically fermenting pond (202), Herba Eichhorniae culturing pool (301), small-scale artificial wetland (302), methane-generating pit (401) are arranged in the warm canopy (501), and warm canopy (501) below is provided with heating network (502); Described small-scale artificial wetland (302) is planted mater convolvulus take 0.5-1 mm limestone particle as matrix on it;
Sewage in the Buffer Pool (1) is by introducing in the aeration tank (201) by pipe network behind the pH regulator, behind precipitable thing in aeration tank (201) the removal sewage and the floating matter sewage is passed in the anaerobically fermenting pond (202), anaerobically fermenting and denitrogenation are carried out to sewage in anaerobically fermenting pond (202), the sewage that discharge in anaerobically fermenting pond (202) flow through successively Herba Eichhorniae culturing pool (301) and small-scale artificial wetland (302), behind the element of the phosphorus in the decontaminated water, nitrate and impurity, discharging enters network of waterways system;
Herba Eichhorniae in the Herba Eichhorniae culturing pool (301) and the mater convolvulus of small-scale artificial wetland (302) are sent in the methane-generating pit (401) and ferment, the natural pond liquid that produces in the methane-generating pit (401) passes in the phosphorus element recycling module (6) that lime and Tai-Ace S 150 flocculation agent are housed, the biogas that methane-generating pit (401) produces passes into fires hot water boiler (503), fire the hot water that hot water boiler (503) fires and pass into heating network (502), the heat that heating network (502) produces offers warm canopy (501).
2. a kind of small-sized anniversary composite purification system that utilizes the Herba Eichhorniae purifying domestic sewage according to claim 1, it is characterized in that: the escape pipe of described methane-generating pit (401) is connected with the gas combustion apparatus of production lighting system (402).
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| CN112744923A (en) * | 2021-01-20 | 2021-05-04 | 皖西学院 | Intelligent farm sewage ecological cycle purification treatment system and process |
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| US8021551B2 (en) * | 2008-03-27 | 2011-09-20 | Mark Harrison | Eco-treatment system |
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