CN105174660A - Urban domestic sewage treatment technology using A/O method - Google Patents
Urban domestic sewage treatment technology using A/O method Download PDFInfo
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- CN105174660A CN105174660A CN201510721150.6A CN201510721150A CN105174660A CN 105174660 A CN105174660 A CN 105174660A CN 201510721150 A CN201510721150 A CN 201510721150A CN 105174660 A CN105174660 A CN 105174660A
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Abstract
The invention provides an urban domestic sewage treatment technology using an A/O method. The technology includes the following steps that (1) urban domestic sewage is collected and then conveyed into a sewage pond after being preliminarily filtered by a screen; (2) the domestic sewage in the sewage pond is conveyed into a biological pond to be further mixed; (3) the domestic sewage treated in the biological pond is conveyed into an anoxic pond; (4) the domestic sewage treated in the anoxic pond is conveyed into an anaerobic pond; (5) the domestic sewage treated by an oxic pond is conveyed into a settling pond for conducting sedimentation treatment, sludge obtained through sedimentation is circulated to the biological pond for circulating treatment or conveyed into a sludge storage tank to be collected, and water coming from the settling pond is conveyed into a clean water pond to be stored after being filtered by an MBR film. By the adoption of the technology, the A/O method is used for treatment of the urban domestic sewage, the quality of yielding water is good, the treatment effect is obvious, and no sludge is produced in the treatment process; the treatment ponds can be buried underground, so that the occupied area is small, treatment cost is low, and the technology is environmentally friendly.
Description
Technical field
The present invention relates to a kind of A/O method city domestic sewage treatment process.
Background technology
City domestic sewage is the product in urban development, and along with the quickening of urbanization and process of industrialization, its generation constantly increases, and pollutes day by day serious, seriously constrains the Sustainable development of urban society's economy.Administer water pollutions, water conservation, is not only the problem of world today's property, the task of top priority that generally faces of China town and country especially.Municipal effluent is the various sewage that municipal sewage system systematic collection arrives, and is a kind of combined sewage.Municipal effluent has to pass through process and reaches relevant emission standards and could discharge water body, avoids causing water pollution.At present, the quantity of wastewater effluent of small and medium-sized cities accounts for the over half of national total amount of sewage discharge, and along with the fast development of future 50 years city-building, the quantity discharged of sanitary sewage will several times, the even increase of tens times, certainly will the deterioration of exacerbate water environment.Therefore, during municipal sewage plant's process water recycling, should corresponding water quality standard be performed according to application target and determine corresponding wastewater deep treatment process.Country has been classified as urban water supply and sewerage the industry of Infrastructure Field emphasis support; the resource utilization of sewage, the regeneration of sewage; not only improve the utilization ratio of water but also effectively protect water surrounding; be conducive to the health, the benign cycle that realize urban water system; in the long run, this will be the Optimized Approaches effectively solving China's shortage of water resources and water environment degradation problem.
Domestic sewage treatment process divides by flow process and handling procedure, can be divided into pretreatment technology, primary treatment processes, second-stage treatment technique, advanced treatment process and sludge treatment technique, and final sludge disposal.The determination of its technique, is according to urban water environmental quality requirement, water water quality situation, can determines for the combined factors of the aspects such as the technical development state utilized, urban economy situation and city management operating requirement.At present, what domestic application was more has the types such as A-O or A-A-O technique, SBR technique, oxidation ditch process.
Wherein, A-O method (anaerobic-aerobic method) processes sanitary sewage.A/O is the abbreviation of Anoxic/Oxic, and its superiority is that also having certain denitrogenation dephosphorizing function, is by the pre-treatment of anaerobic hydrolysis technology for active sludge except having made quick-witted pollutent obtain except degraded, so A/O method is the activated sludge process improved.
For A/O method process sanitary sewage, the following patent documentation of current domestic main existence:
Patent publication No.: CN104529081A, the treatment process of open one way of life sewage, sewage after pretreatment, primary sedimentation pond, biological tank and secondary sedimentation basins process successively, and described biological tank comprises anoxic section, anaerobism section, the second anoxic section, the second anaerobism section, the 3rd anoxic section, aerobic section.The present invention is arranged alternately by low DO and anaerobism and anoxic section, is conducive to thread fungus and zoogloea competitive equilibrium, both improves wastewater treatment efficiency, can prevent again the generation of Filamentous Bulking, greatly reduce cost of sewage disposal.Although but adopt AO method process sanitary sewage in this patent, treatment process too complex, treatment unit floor space is large, and processing cost is high.
Summary of the invention
For solving above-mentioned Problems existing, the object of the present invention is to provide a kind of A/O method city domestic sewage treatment process, described technique adopts A/O method process city domestic sewage, effluent quality is good, and treatment effect is obvious, produces in treating processes without mud, and underground can be imbedded in process pond, floor space is little, and processing cost is low, environmentally friendly.
For achieving the above object, technical scheme of the present invention is:
A kind of A/O method city domestic sewage treatment process, comprises the steps:
1) collect city domestic sewage, after screen cloth tentatively filters, send into sewage lagoon;
2) sanitary sewage in sewage lagoon is sent into biological tank to mix further, the denitrifying bacteria in biological tank is utilized to carry out denitrification process to the organic carbon in sanitary sewage, and in biochemistry pool, increase enzyme float filler as microbial carrier, the microorganism in sanitary sewage and suspended active mud are degraded jointly;
3) sanitary sewage after biological tank process is sent into anoxic pond, the suspended contaminant such as the starch in sanitary sewage, fiber, carbohydrate and dissolved organic matter are hydrolyzed to organic acid by the heterotrophic bacterium in anoxic pond, the pollutent such as protein, fat is carried out ammonification, and dissociate NH
4and HN
3;
4) sanitary sewage after anoxic pond process is sent into anaerobic pond, the denitrifying bacteria in anaerobic pond carries out denitrogenation processing to sanitary sewage;
5) sanitary sewage after anaerobic pond process is sent in Aerobic Pond, under the effect of Aerobic Pond nitrifier, the ammonia nitrogen in degraded sanitary sewage;
6) sanitary sewage after Aerobic Pond process is sent into settling tank and is carried out precipitation process, and precipitation gained sludge circulation is to biological tank circular treatment or deliver to the collection and treatment of mud storage tank, and settling tank water outlet is sent into clean water basin and stored after MBR membrane filtration.
Further, step 2) in sanitary sewage residence time in biological tank be 0.5 ~ 1h.
Separately, step 3) in sanitary sewage residence time in anoxic pond be 0.3 ~ 0.5h.
Separately have, step 3) DO≤0.2mg/L in described anoxic pond.
Again, step 5) in sanitary sewage residence time in anaerobic pond be 1 ~ 2h.
Further, step 5) in sanitary sewage residence time in Aerobic Pond be 0.3 ~ 0.5h.
And, step 5) described in Aerobic Pond DO be 2 ~ 4mg/L.
Separately, in sanitary sewage, degradation effect of organic compound is 93 ~ 95%.
Again, phosphorus concentration <3mg/L is contained in described sanitary sewage.
Beneficial effect of the present invention is:
Described processing step is reasonable in design, between anoxic pond and Aerobic Pond, set up anaerobic pond, promotes sanitary sewage disposal efficiency and treatment effect further, be starkly lower than national sanitary sewage disposal emission standard, effluent quality is good, and in sanitary sewage, degradation effect of organic compound is 93 ~ 95%, containing phosphorus concentration <3mg/L in sanitary sewage, treatment effect is obvious, produce without mud in treating processes, and underground can be imbedded in process pond, floor space is little, processing cost is low, environmentally friendly.
Embodiment
Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.The implementation condition adopted in embodiment can be for further adjustments according to the condition of producer, and unaccounted implementation condition is generally conventional laboratory conditions.
A kind of A/O method city domestic sewage treatment process provided by the present invention, comprises the steps:
1) collect city domestic sewage, after screen cloth tentatively filters, send into sewage lagoon;
2) sanitary sewage in sewage lagoon is sent into biological tank to mix further, the denitrifying bacteria in biological tank is utilized to carry out denitrification process to the organic carbon in sanitary sewage, and in biochemistry pool, increase enzyme float filler as microbial carrier, the microorganism in sanitary sewage and suspended active mud are degraded jointly;
3) sanitary sewage after biological tank process is sent into anoxic pond, the suspended contaminant such as the starch in sanitary sewage, fiber, carbohydrate and dissolved organic matter are hydrolyzed to organic acid by the heterotrophic bacterium in anoxic pond, the pollutent such as protein, fat is carried out ammonification, and dissociate NH
4and HN
3;
4) sanitary sewage after anoxic pond process is sent into anaerobic pond, the denitrifying bacteria in anaerobic pond carries out denitrogenation processing to sanitary sewage;
5) sanitary sewage after anaerobic pond process is sent in Aerobic Pond, under the effect of Aerobic Pond nitrifier, the ammonia nitrogen in degraded sanitary sewage;
6) sanitary sewage after Aerobic Pond process is sent into settling tank and is carried out precipitation process, and precipitation gained sludge circulation is to biological tank circular treatment or deliver to the collection and treatment of mud storage tank, and settling tank water outlet is sent into clean water basin and stored after MBR membrane filtration.
Further, step 2) in sanitary sewage residence time in biological tank be 0.5 ~ 1h.
Separately, step 3) in sanitary sewage residence time in anoxic pond be 0.3 ~ 0.5h.
Separately have, step 3) DO≤0.2mg/L in described anoxic pond.
Again, step 5) in sanitary sewage residence time in anaerobic pond be 1 ~ 2h.
Further, step 5) in sanitary sewage residence time in Aerobic Pond be 0.3 ~ 0.5h.
And, step 5) described in Aerobic Pond DO be 2 ~ 4mg/L.
Separately, in sanitary sewage, degradation effect of organic compound is 93 ~ 95%.
Again, phosphorus concentration <3mg/L is contained in described sanitary sewage.
A kind of A/O method city domestic sewage treatment process provided by the present invention, step is reasonable in design, anaerobic pond is set up between anoxic pond and Aerobic Pond, further lifting sanitary sewage disposal efficiency and treatment effect, be starkly lower than national sanitary sewage disposal emission standard, effluent quality is good, in sanitary sewage, degradation effect of organic compound is 93 ~ 95%, containing phosphorus concentration <3mg/L in sanitary sewage, treatment effect is obvious, produces in treating processes without mud, and underground can be imbedded in process pond, floor space is little, and processing cost is low, environmentally friendly.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not depart from the scope of technical solution of the present invention, it all should be encompassed in right of the present invention.
Claims (9)
1. an A/O method city domestic sewage treatment process, is characterized in that, comprise the steps:
Collect city domestic sewage, after screen cloth tentatively filters, send into sewage lagoon;
Sanitary sewage in sewage lagoon is sent into biological tank mix further, the denitrifying bacteria in biological tank is utilized to carry out denitrification process to the organic carbon in sanitary sewage, and in biochemistry pool, increase enzyme float filler as microbial carrier, the microorganism in sanitary sewage and suspended active mud are degraded jointly;
Sanitary sewage after biological tank process is sent into anoxic pond, the suspended contaminant such as the starch in sanitary sewage, fiber, carbohydrate and dissolved organic matter are hydrolyzed to organic acid by the heterotrophic bacterium in anoxic pond, the pollutent such as protein, fat is carried out ammonification, and dissociate NH
4and HN
3;
Sanitary sewage after anoxic pond process is sent into anaerobic pond, and the denitrifying bacteria in anaerobic pond carries out denitrogenation processing to sanitary sewage;
Sanitary sewage after anaerobic pond process is sent in Aerobic Pond, under the effect of Aerobic Pond nitrifier, the ammonia nitrogen in degraded sanitary sewage;
Sanitary sewage after Aerobic Pond process is sent into settling tank and is carried out precipitation process, and precipitation gained sludge circulation is to biological tank circular treatment or deliver to the collection and treatment of mud storage tank, and settling tank water outlet is sent into clean water basin and stored after MBR membrane filtration.
2., according to a kind of A/O method city domestic sewage treatment process described in claim 1, it is characterized in that, step 2) in sanitary sewage residence time in biological tank be 0.5 ~ 1h.
3., according to a kind of A/O method city domestic sewage treatment process described in claim 1, it is characterized in that, step 3) in sanitary sewage residence time in anoxic pond be 0.3 ~ 0.5h.
4., according to a kind of A/O method city domestic sewage treatment process described in claim 1, it is characterized in that, step 3) DO≤0.2mg/L in described anoxic pond.
5., according to a kind of A/O method city domestic sewage treatment process described in claim 1, it is characterized in that, step 5) in sanitary sewage residence time in anaerobic pond be 1 ~ 2h.
6., according to a kind of A/O method city domestic sewage treatment process described in claim 1, it is characterized in that, step 5) in sanitary sewage residence time in Aerobic Pond be 0.3 ~ 0.5h.
7. a kind of A/O method city domestic sewage treatment process according to claim 1, is characterized in that, step 5) described in Aerobic Pond DO be 2 ~ 4mg/L.
8. a kind of A/O method city domestic sewage treatment process according to claim 1, it is characterized in that, in sanitary sewage, degradation effect of organic compound is 93 ~ 95%.
9. a kind of A/O method city domestic sewage treatment process according to claim 1, is characterized in that, it is characterized in that, containing phosphorus concentration <3mg/L in described sanitary sewage.
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Cited By (2)
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| CN105948382A (en) * | 2016-05-12 | 2016-09-21 | 安徽国能亿盛环保科技有限公司 | Domestic sewage treatment process |
| CN106007189A (en) * | 2016-06-28 | 2016-10-12 | 尚川（北京）水务有限公司 | Urban black-odorous sewage treatment system and technology |
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Application publication date: 20151223 |