CN106348448A - Wastewater treatment process for advanced bio-denitrification - Google Patents
Wastewater treatment process for advanced bio-denitrification Download PDFInfo
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- CN106348448A CN106348448A CN201611107714.8A CN201611107714A CN106348448A CN 106348448 A CN106348448 A CN 106348448A CN 201611107714 A CN201611107714 A CN 201611107714A CN 106348448 A CN106348448 A CN 106348448A
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- Prior art keywords
- sludge
- smbr
- nitrobacteria
- denitrification
- membrane bioreactor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
Abstract
The invention discloses a wastewater treatment process for advanced bio-denitrification. According to the process, on the basis of a traditional biological nitrogen and phosphorus removal process, a sludge membrane bioreactor (SMBR) is additionally arranged, so that an advanced bio-denitrification process is formed. The process is characterized by carrying out SMBR extended aeration treatment on part of secondary sedimentation tank returned sludge, building an environment suitable for the growth of nitrobacteria in the SMBR, and returning sludge enriching the nitrobacteria into an aerobic pool, so that the nitration efficiency of a large amount of nitrobacteria with high activity is greatly improved, and the SMBR discharge water is returned into an anaerobic pool so as to be denitrified or recycled in plants. According to the advanced bio-denitrification process, the hydraulic retention time of the aerobic pool can be reduced, the denitrification efficiency of a sewage treatment plant can be improved, and the surplus sludge of a secondary sedimentation tank can be reduced and stabilized. The process provided by the invention not only can be applicable to new sewage treatment plants, but also can be applicable to upgrading and reconstruction of the existing sewage treatment plants.
Description
Technical field
Patent of the present invention relates to a kind of sewage treatment process of enhanced biological nitrogen removal, specifically belongs to a kind of water technology.
Background technology
Along with improving constantly of industrial expansion and resident living level, the pollution species in municipal sewage and industrial wastewaterClass increases increasingly, and wherein and ubiquitous two pollutants very large to ambient influnence are nitrogen and phosphorus. Organic nitrogen and ammonia nitrogen in waterCan consume the dissolved oxygen in water, make water body blackout, smelly; Nitrogen and phosphorus in water body are too much, can cause body eutrophication, make waterWater environment degradation. Therefore, must remove nitrogen and the phosphorus in sewage.
At present, for pollutant kind and discharge standard, sewage treatment plant adopts biological denitrification phosphorous removal technique more. Through too muchThe development in year has formed such as A/A/O series, oxidation ditch series and other techniques. Taking A/A/O technique as example, A/A is whereinThe abbreviation of English anaerobic-anoxic is the improvement of A/O technique. Sewage and returned sludge are introduced into anaerobic pond (DO <0.5mg/L) mix completely, after the anaerobic digestion of certain hour (1-2h), remove part BOD wherein, in mud, part containsNitrogen compound changes into N2(denitrification) and discharge, the poly-phosphorus Microbiological release in returned sludge goes out phosphorus. Then, mixed liquorFlow into anoxic pond, the denitrifying bacteria in this pond, taking the carbonaceous organic material in sewage as carbon source, loops back Aerobic Pond by interiorFlow to the NO coming3 -Be reduced to N2And discharge. Then sewage flows into Aerobic Pond, the NH in water3-H carries out nitration reaction generation
NO3 -, in water, oxidation operation decomposes supply suction phosphorus microorganism with energy simultaneously, and microorganism absorbs phosphorus from water, and phosphorus enters cellTissue is discharged from system with the form of rich phosphorous sludge after sedimentation basin separates.
Biological denitrificaion mechanism description
In bio-denitrifying sewage dephosphorization process, biological denitrificaion comprises nitrated and two stages of denitrogenation. Wherein, nitrated is for describingAmmonia (NH4 +-N) be oxidized to nitrite (NO2-N) and nitrite be oxidized to nitrate (NO3-N) the biological mistake of this one-phaseThe term of journey, denitrogenation is converted into nitric oxide, nitrous oxide and nitrogen by micro-reduction effect by nitrate nitrogenProcess.
Nitrated
Nitrobacteria belongs to the aerobic autotroph of obligate, breeds slowlyer, only has when dissolved oxygen abundance, when sludge age is longer, just hasBe beneficial to the accumulation of nitrifier. First be, nitrite by Nitrosomas by mineralized nitrogen:
, then be nitrate by Nitromonas by Nitrite transformation then:
Total reaction is:
The speed of nitrification, relevant with following factor:
(1) pH value: in the time that pH value is 8.4 (20 DEG C), nitrification is fastest.
(2) temperature: when temperature is high, rate of nitrification is fast. When nitrated speed 30 DEG C time is 17 DEG C one times.
(3) DO value: need higher DO value, in the time that DO drops to 0.5mg/L by 2mg/L, nitrated speed drops to by 0.09
0.045kgNH4 +/（kg MLSS•d）。
(4) ammonia concentration: in the time that ammonia concentration is less than 2.5mg/L, nitrated speed sharply declines.
Denitrogenation
Under anoxia condition (DO can not be greater than 0.5mg/L), NO3 -Can be converted into gaseous nitrogen:
In bioprocesses, nitrate has two kinds of transformation modes, is called as respectively nitrate assimilation reduction and nitrateAlienation reduction. Nitrate assimilation reduction relates to synthesizes nitrate reduction for ammonia provides cell, assimilation occurs in scarceFew available NH4 +-N and not relying under the condition of DO concentration. On the other hand, the alienation reduction of nitrate or biological denitrificaion mistakeIn journey, be accompanied by the generation of respiration electron transport chain, and using nitrate or nitrite as various organic or inorganic electronicsThe electron acceptor of donor oxidation reaction.
In biological carbon and phosphorous removal system, anaerobism, anoxic, aerobic process can carry out in different equipment, also can be sameThe different parts of one equipment completes. General sewage treatment plant in the time of this kind of synchronous denitrogen dephosphorus technology operation, due to be subject to multiple outsideThe impact of boundary's factor, the especially impact of winter low temperature, denitrification effect is poor, is difficult to meet the current discharge standard day by day improving.
How can, ensureing, on the constant basis of other functions, to improve nitric efficiency, be the emphasis that we make great efforts always.
Summary of the invention
According to principle of biological nitrogen removal, utilize the sludge retention effect of membrane bioreactor, the invention provides a kind of strengthening rawThing denitrification sewage treatment process.
In original biological carbon and phosphorous removal water treatment technology, increase a set of sludge membrane bioreactor (SMBR) newly, passed throughSMBR carries out extended aeration to the returnedactivatedsludge of part second pond, and adds the sludge concentration tank supernatant of the high ammonia nitrogen of partAs nutrition, nitrobacteria in SMBR is in the ascendance, then by the sludge reflux that is rich in nitrobacteria to Aerobic Pond, strengthen nitreChange effect, nitrification liquid is back to and in anoxic zone or factory, carries out reuse.
Beneficial effect:
(1) the pure aerobic environment in sludge membrane bioreactor (SMBR), higher dissolved oxygen promotes the growth of nitrobacteria;
(2) the sludge retention effect of sludge membrane bioreactor (SMBR), makes hydraulic detention time (HRT) and sludge retention time(SRT) thoroughly separate, ensure sufficiently long sludge retention time (SRT), be conducive to holding back of nitrobacteria;
(3) adopt sludge concentration tank supernatant as nutrient source, utilize its ammonia nitrogen concentration of substrate high, promote nitrobacteria growth;
(4) the longer sludge retention time (SRT) of sludge membrane bioreactor (SMBR), mud is in endogenous respiration state, lowCOD load, promotes nitrobacteria growth under high ammonia nitrogen state;
(5) endogenous respiration is exothermic reaction, is conducive to maintain the higher reaction temperature of sludge membrane bioreactor (SMBR), favourableIn the growth of nitrobacteria;
(6) newly-increased nitrifying sludge is back to Aerobic Pond, makes the nitrifying sludge that spreads cultivation all the time under aerobic environment, is conducive to speciallyProperty aerobic nitrobacteria growth;
(7) nitrobacteria of this technology comes from biochemical system itself, and changes with the variation of water quality and environment, and its bacterial classification is to waterThe adaptability of matter is good;
(8) nitrobacteria of sludge membrane bioreactor (SMBR) is attached on activated sludge, be back in Aerobic Pond with pond inActivated sludge compatibility good, nitrobacteria be difficult for run off. And some adds merely the technology of nitrobacteria, because nitrifier lacksThe weary carrier adhering to, runs off serious, must constantly add;
(9) due to sludge membrane bioreactor (SMBR) system and main body biochemical system relatively independent, its resistance to impact and impactAfter recovery capability stronger, can promote the stability of denitrification system entirety;
(10) due to the lifting of nitrification efficiency, can shorten the Aerobic Pond time of staying, can reduce engineering construction for grassroot project and throwMoney, can propose mark or increase-volume to transformation project;
(11) mud endogenous respiration, surplus sludge volume reduces, and reduces the cost of sludge treating system;
Membrane bioreactor is generally used for sewage disposal end, improves water outlet every water quality, the present invention creatively propose byMembrane bioreactor, as the module of a kind of Continuous Cultivation nitrobacteria, can improve taking off in traditional biological denitrification process greatlyNitrogen efficiency, and can reduce to a certain extent sludge yield.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention, the accompanying drawing of required use during embodiment is described is done to letter belowSingly introduce.
Accompanying drawing 1 is that existing biological denitrification phosphorous removal technique system is (with traditional A2/ O is example);
Accompanying drawing 2 is that process chart of the present invention is (with traditional A2/ O transform example as).
Wherein, as shown in the drawing: 1, anaerobic pond; 2, anoxic pond; 3, Aerobic Pond; 4, sedimentation basin; 5, mud membrane bioreactionAnswer device (SMBR); 6, back with water inlet line; 7, inner circulating tube line; 8, water outlet pipeline; 9, returned sludge; 10, excess sludge; 11, mudReflux pump; 12, nitrification liquid reflux pump.
Detailed description of the invention
With reference to accompanying drawing 2, at traditional biological denitrification dephosphorization system (with A2/ O technique is example) a set of mud film biology of middle increaseReactor (SMBR), carries out extended aeration by SMBR to the returnedactivatedsludge of part second pond, and adds the high ammonia nitrogen of partSludge concentration tank supernatant as nutrition, create an environment that is suitable for nitrobacteria growth, nitrobacteria in SMBR is accounted forSuperiority, then sludge reflux to the Aerobic Pond that is rich in nitrobacteria is strengthened to nitrification effect, nitrification liquid be back to anoxic zone orIn factory, carry out reuse.
Certainly, described example is only example of the present invention, and not representative is all, also non-to protection limit of the present inventionFixed, based on embodiments of the invention, this area those of ordinary skill is not making before creative work, according to this enforcementSame can the variation that the mentality of designing of example is done, other embodiment that obtain, all fall into the protection domain of this case.
Claims (3)
1. the sewage treatment process of an enhanced biological nitrogen removal it is characterized in that on existing biological denitrification phosphorous removal technique basisOn increased a set of sludge membrane bioreactor (SMBR) newly, expose to the sun by the returnedactivatedsludge of part second pond is carried out to time delayGas, and the sludge concentration tank supernatant that adds the high ammonia nitrogen of part is as nutrition, and nitrobacteria in SMBR is in the ascendance, then willBe rich in the sludge reflux of nitrobacteria to Aerobic Pond, strengthen nitrification effect, nitrification liquid is back to and in anoxic zone or factory, carries out reuse.
2. sludge membrane bioreactor (SMBR) specification can be determined according to concrete amount of inlet water.
3. in sludge membrane bioreactor (SMBR), can, according to practical operation situation, carry out temperature control, extra-nutrition source, addsLime stone regulates pH.
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| CN201611107714.8A CN106348448A (en) | 2016-12-06 | 2016-12-06 | Wastewater treatment process for advanced bio-denitrification |
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| CN201611107714.8A CN106348448A (en) | 2016-12-06 | 2016-12-06 | Wastewater treatment process for advanced bio-denitrification |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109110918A (en) * | 2018-09-18 | 2019-01-01 | 戚汝常 | A kind of novel SBR-MBR sewage disposal system and technique |
| CN110015814A (en) * | 2019-04-23 | 2019-07-16 | 东南大学 | A kind of synchronous device and method for realizing sewage denitrification and dephosphorization and reclamation of phosphorus resource |
| CN111268802A (en) * | 2020-03-26 | 2020-06-12 | 上海仁创环境科技有限公司 | Dynamic membrane separation sewage treatment method |
| CN112028403A (en) * | 2020-08-28 | 2020-12-04 | 倍杰特集团股份有限公司 | Method and system for treating wastewater containing phenol and acetone |
| CN113800715A (en) * | 2021-09-15 | 2021-12-17 | 北京清河北苑水务有限公司 | Sewage treatment system and method |
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| CN2776968Y (en) * | 2005-03-29 | 2006-05-03 | 上海市政工程设计研究院 | Reflux biological phosphorus removing device of sludge |
| CN203959926U (en) * | 2014-06-25 | 2014-11-26 | 四川环能德美科技股份有限公司 | Combined type SMBR waste disposal plant |
| CN205687742U (en) * | 2016-06-02 | 2016-11-16 | 山东聊城倍杰特环保工程设计有限公司 | A kind of phenol-acetone sewage disposal device |
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2016
- 2016-12-06 CN CN201611107714.8A patent/CN106348448A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2776968Y (en) * | 2005-03-29 | 2006-05-03 | 上海市政工程设计研究院 | Reflux biological phosphorus removing device of sludge |
| CN203959926U (en) * | 2014-06-25 | 2014-11-26 | 四川环能德美科技股份有限公司 | Combined type SMBR waste disposal plant |
| CN205687742U (en) * | 2016-06-02 | 2016-11-16 | 山东聊城倍杰特环保工程设计有限公司 | A kind of phenol-acetone sewage disposal device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109110918A (en) * | 2018-09-18 | 2019-01-01 | 戚汝常 | A kind of novel SBR-MBR sewage disposal system and technique |
| CN110015814A (en) * | 2019-04-23 | 2019-07-16 | 东南大学 | A kind of synchronous device and method for realizing sewage denitrification and dephosphorization and reclamation of phosphorus resource |
| CN110015814B (en) * | 2019-04-23 | 2021-06-11 | 东南大学 | Device and method for synchronously realizing nitrogen and phosphorus removal of sewage and phosphorus resource recovery |
| CN111268802A (en) * | 2020-03-26 | 2020-06-12 | 上海仁创环境科技有限公司 | Dynamic membrane separation sewage treatment method |
| CN112028403A (en) * | 2020-08-28 | 2020-12-04 | 倍杰特集团股份有限公司 | Method and system for treating wastewater containing phenol and acetone |
| CN113800715A (en) * | 2021-09-15 | 2021-12-17 | 北京清河北苑水务有限公司 | Sewage treatment system and method |
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Effective date of registration: 20190325 Address after: 4 floors, 391-393 Dongda Ming Road, Hongkou District, Shanghai 200000 Applicant after: Shanghai Renye Environmental Protection Technology Co., Ltd. Address before: 2000 65 1-2 floors of 4 blocks, 1628 Lizheng Road, Shuyuan Town, Pudong New Area, Shanghai Applicant before: Shanghai Creek Environment Engineering Co., Ltd. |
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Application publication date: 20170125 |