CN105217789A - A kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage - Google Patents
A kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage Download PDFInfo
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- CN105217789A CN105217789A CN201510730693.4A CN201510730693A CN105217789A CN 105217789 A CN105217789 A CN 105217789A CN 201510730693 A CN201510730693 A CN 201510730693A CN 105217789 A CN105217789 A CN 105217789A
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Abstract
The invention discloses a kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage, this processing step comprises: 1. raw waste water or pretreated sewage are mixed in anaerobic pond with returned sluge, 2. the nitrification liquid of the first Aerobic Pond is back in the first anoxic pond and mixes with the mixed solution after anaerobic treatment, 3. the mixed solution after anaerobic treatment enters the first Aerobic Pond, 4. the mixed solution after the first Aerobic Pond process enters into the second anoxic pond, 5. the mixed solution after the second anoxic pond process enters into the second Aerobic Pond, and 6. mixed solution carries out mud-water separation in settling tank.The present invention is particularly suitable for the process of low carbon-nitrogen ratio sewage, not only can organics removal, can also remove nitrogen, phosphorus efficiently.In addition, this technique can reduce total pond and hold and mixed liquid recycle ratio, effectively reduces construction cost and working cost, has achieved large-scale engineer applied at present.
Description
Technical field
The present invention relates to a kind of process of low carbon-nitrogen ratio sewage, particularly relate to a kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage.
Background technology
In recent years, constantly there is the explosive environment event because body eutrophication causes in China, the whole society significantly improves for the attention rate of water environmental problems.Country is with local more and more stricter to the requirement of sewage work's denitrogenation dephosphorizing, " 12 " period, ammonia nitrogen is included in water pollutant overall control index system by country first, clearly propose the target that ammonia nitrogen reduces discharging 10%, denitrogenation dephosphorizing becomes one of very important major issue of sewage work's upgrading.Sewage disposal enters from the stage for the purpose of single organics removal should advanced treatment stage of organics removal denitrogenation dephosphorizing again.
In addition, China's town sewage carbon-nitrogen ratio is general lower, add the contradiction that nitrifier in operational process, denitrifying bacteria and polyP bacteria exist in mud age and other factors, cause the effluent quality of the urban wastewater treatment firm of more than 95% to be difficult to reach the one-level emission standard A of " urban wastewater treatment firm pollutant emission standard " (GB18918-2002).And the general treatment scale of municipal sewage plant is comparatively large, the cost of chemical denitrogenation dephosphorizing is too high, and usually only as supplementary means, biological carbon and phosphorous removal effect directly determines working cost.Under this form, a kind of efficient biological denitrification phosphorous removal technique is selected to be the key issue that newly-built sewage work and old sewage work upgrading face.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, and object is to provide a kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage, not only can organics removal but also can high-efficient denitrification and dephosphorization.
A kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage provided by the invention, this processing step comprises:
1. mud release phosphorus: raw waste water or pretreated sewage are mixed with from the returned sluge in settling tank in anaerobic pond, carry out the release of phosphorus under the effect of polyP bacteria,
2. denitrogenation processing: the nitrification liquid of the first Aerobic Pond is back in the first anoxic pond and mixes with the mixed solution after anaerobic treatment, carries out denitrogenation processing through denitrification,
3. remove biochemical oxygen demand (BOD): the mixed solution after anaerobic treatment enters the first Aerobic Pond, remove the organic pollutant that raw waste water is brought into,
4. denitrogenation processing: the mixed solution after the first Aerobic Pond process enters into the second anoxic pond, carries out denitrogenation processing through denitrification,
5. absorb phosphorus and nitration treatment: the mixed solution after the second anoxic pond process enters into the second Aerobic Pond, under the effect of polyP bacteria, carry out absorption process to phosphorus, nitration treatment is carried out in the acting in conjunction through nitrococcus and nitrifier,
6. mud-water separation process: the mixed solution after the second Aerobic Pond process carries out mud-water separation in settling tank, supernatant liquor is as the Chinese effluent after process, using a part for phosphorus containing sludge as returned sluge, be back in anaerobic pond, another part discharges as excess sludge.
In described first anoxic pond and the second anoxic pond, need supplementary carbon source.
Beneficial effect of the present invention is: 1. treatment effect is good, and can realize efficient dephosphorization, denitrification percent reaches more than 92-97%, and dephosphorizing rate reaches 98%; 2. this technique is particularly suitable for the biological carbon and phosphorous removal of underload Sewage Plant, can reduce total pond and hold and mixed liquid recycle ratio; 3. treatment effect is stablized, and achieves large-scale engineering applications at present.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
In figure: 1-raw waste water or pretreated sewage, 2-anaerobic pond, 3-first anoxic pond, 4-first Aerobic Pond, 5-second anoxic pond, 6-second Aerobic Pond, 7-settling tank, 8-water outlet, 9-additional carbon, 10-nitrification liquid refluxes, 11-excess sludge, 12-returned sluge.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
A kind of high-efficient denitrification and dephosphorization processing step being applicable to low carbon-nitrogen ratio sewage comprises:
1. mud release phosphorus: raw waste water or pretreated sewage are mixed in anaerobic pond with from the returned sluge in settling tank, the release of phosphorus is carried out under the effect of polyP bacteria, nitric nitrogen approach exhaustion in the second anoxic pond, eliminate the disadvantageous effect of nitric nitrogen to polyP bacteria, thus ensure stability and the biological phosphor-removing effect of anaerobic pond.
2. secondly denitrogenation processing: the nitrification liquid of the first Aerobic Pond is back in the first anoxic pond and mixes with the mixed solution after anaerobic treatment, carries out denitrogenation processing through denitrification is remove BOD (biochemical oxygen demand (BOD)).
3. remove biochemical oxygen demand (BOD): the mixed solution after anaerobic treatment enters the first Aerobic Pond, major function removes the organic pollutant brought into by raw waste water, reaches the effect removing biochemical oxygen demand (BOD); Secondary function: one is nitrifying process, but due to the concentration of biochemical oxygen demand (BOD) also higher, therefore, degree of nitration is lower, the NO of generation
3 --N is also less; Two is polyP bacteria absorption processes to phosphorus.By dephosphorization mechanism, only at NO
x -after effectively being deviate from, just can obtain good phosphor-removing effect, therefore, in the first Aerobic Pond, the effect that phosphorus absorbs can not be very good.
4. secondly denitrogenation processing: the mixed solution after the first Aerobic Pond process enters into the second anoxic pond, carries out denitrogenation processing through denitrification is discharge phosphorus under the effect of polyP bacteria.
5. phosphorus and nitration treatment is absorbed: the mixed solution after the second anoxic pond process enters into the second Aerobic Pond, under the effect of polyP bacteria, absorption process is carried out to phosphorus, nitration treatment is carried out in acting in conjunction through nitrococcus and nitrifier, is secondly remove biochemical oxygen demand (BOD) further.
6. mud-water separation process: the mixed solution after the second Aerobic Pond process carries out mud-water separation in settling tank, supernatant liquor is as the Chinese effluent after process, using a part for phosphorus containing sludge as returned sluge, be back in anaerobic pond, another part discharges as excess sludge, reaches the object of biological phosphate-eliminating.
For low-carbon-source sewage, need supplementary carbon source in anoxic pond.
Embodiment 1: adopt denitrification dephosphorization technique method provided by the invention to process urban cells sanitary sewage, treatment effect is in table 1.
One kind, table 1 is applicable to the high-efficient denitrification and dephosphorization art breading effect of low carbon-nitrogen ratio sewage
Note: COD-chemical oxygen demand (COD), BOD-biochemical oxygen demand (BOD)
Embodiment 2: adopt denitrification dephosphorization technique method provided by the invention to process school life's sewage, treatment effect is in table 2.
One kind, table 2 is applicable to the high-efficient denitrification and dephosphorization art breading effect of low carbon-nitrogen ratio sewage
Note: COD-chemical oxygen demand (COD), BOD-biochemical oxygen demand (BOD)
Embodiment 3: adopt denitrification dephosphorization technique method provided by the invention to process small towns sanitary sewage, treatment effect is in table 3.
One kind, table 3 is applicable to the high-efficient denitrification and dephosphorization art breading effect of low carbon-nitrogen ratio sewage
Note: COD-chemical oxygen demand (COD), BOD-biochemical oxygen demand (BOD)
Embodiment 4: adopt the sewage of denitrification dephosphorization technique method provided by the invention to Office Area, city to process, treatment effect is in table 4.
One kind, table 4 is applicable to the high-efficient denitrification and dephosphorization art breading effect of low carbon-nitrogen ratio sewage
Note: COD-chemical oxygen demand (COD), BOD-biochemical oxygen demand (BOD)
Anoxic, aerobic reaction, carry out more than twice in systems in which all repeatedly, and each reaction member has its premiere feature, and have other function concurrently.In addition, be provided with anoxic pond, the disadvantageous effect of nitric nitrogen to polyP bacteria can be eliminated, thus ensure stability and the biological phosphor-removing effect of anaerobic pond.
Claims (2)
1. be applicable to a high-efficient denitrification and dephosphorization technique for low carbon-nitrogen ratio sewage, it is characterized in that, this processing step is:
1. mud release phosphorus: raw waste water or pretreated sewage are mixed with from the returned sluge in settling tank in anaerobic pond, carry out the release of phosphorus under the effect of polyP bacteria,
2. denitrogenation processing: the nitrification liquid of the first Aerobic Pond is back in the first anoxic pond and mixes with the mixed solution after anaerobic treatment, carries out denitrogenation processing through denitrification,
3. remove biochemical oxygen demand (BOD): the mixed solution after anaerobic treatment enters the first Aerobic Pond, remove the organic pollutant that raw waste water is brought into,
4. denitrogenation processing: the mixed solution after the first Aerobic Pond process enters into the second anoxic pond, carries out denitrogenation processing through denitrification,
5. absorb phosphorus and nitration treatment: the mixed solution after the second anoxic pond process enters into the second Aerobic Pond, under the effect of polyP bacteria, carry out absorption process to phosphorus, nitration treatment is carried out in the acting in conjunction through nitrococcus and nitrifier,
6. mud-water separation process: the mixed solution after the second Aerobic Pond process carries out mud-water separation in settling tank, supernatant liquor is as the Chinese effluent after process, using a part for phosphorus containing sludge as returned sluge, be back in anaerobic pond, another part discharges as excess sludge.
2. a kind of high-efficient denitrification and dephosphorization technique being applicable to low carbon-nitrogen ratio sewage according to claim 1, is characterized in that, in described first anoxic pond and the second anoxic pond, need supplementary carbon source.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105776542A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved AAO wastewater treatment process for obtaining standard IV-class surface water |
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| CN101691268A (en) * | 2009-09-17 | 2010-04-07 | 上海市政工程设计研究总院 | Biochemical reaction tank and denitrification and dephosphorization process thereof |
| CN202729946U (en) * | 2012-06-11 | 2013-02-13 | 清华大学 | Two-stage anoxic/oxic (A/O)-membrane biological reactor (MBR) nitrogen and phosphorus removal device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105776542A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved AAO wastewater treatment process for obtaining standard IV-class surface water |
| CN105776542B (en) * | 2016-04-20 | 2019-03-29 | 安徽国祯环保节能科技股份有限公司 | A kind of improvement AAO sewage treatment process of IV class of surface water up to standard |
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Inventor after: Zhan Shuyan Inventor before: Zhan Shuyan Inventor before: Liu Peichun Inventor before: Jia Zhanfu |
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