CN108101216A - Sequencing batch active sludge realizes the biological denitrification method of short-cut nitrification and denitrification - Google Patents
Sequencing batch active sludge realizes the biological denitrification method of short-cut nitrification and denitrification Download PDFInfo
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- CN108101216A CN108101216A CN201810009075.4A CN201810009075A CN108101216A CN 108101216 A CN108101216 A CN 108101216A CN 201810009075 A CN201810009075 A CN 201810009075A CN 108101216 A CN108101216 A CN 108101216A
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- denitrification
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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
- C02F3/302—Nitrification and denitrification treatment
Abstract
The present invention provides the biological denitrification method that a kind of sequencing batch active sludge realizes short-cut nitrification and denitrification, including intaking, being aerated aerobic nitrification, stirring anoxic denitrification, be aerated aerobic nitrification again, be stirred for short-time aeration stripping N2, precipitation, draining；Each aerobic, anoxic phases reaction time controls in real time according to the changing features of DO, ORP, pH parameter in cycle.The present invention can control the reaction time in SBR alternating oxic-anoxics each stage in real time, solve the problems, such as automatically controlling for SBR；And above-mentioned real-time control method is taken, terminate to be aerated in time, and water temperature is controlled at 25 30 DEG C or so, it avoids turning out Nitromonas in system.Meanwhile N0 during nitration reaction of the invention3N/NOx N below 5%, ensure that the stable operation of short-cut nitrification and denitrification always.
Description
Technical field
The invention belongs to technical field of sewage, and in particular to a kind of sequencing batch active sludge realizes that short distance nitration is anti-
The bio-denitrification technology and processing method of nitrification.
Background technology
In recent years, as sewage disposal discharge standard is more and more stringenter, in sewage the removal of nitrogen become sewage treatment plant
Cardinal task.The minimizing technology of nitrogen mainly has physico-chemical process and bioanalysis in waste water.Physico-chemical process denitrogenation can only generally remove sewage
In certain specific modality nitrogen, it is and high there are processing cost, have the problems such as secondary pollution and not perfect renovation process to environment.
Bioanalysis denitrogenation refers under the synergy of microorganism, the organic nitrogen and ammonia nitrogen in sewage by ammoniation,
Nitration reaction, anti-nitration reaction are finally translated into the process of nitrogen.Wherein, NH4 +- → (nitrifies the stage) NO2 -―→NO3 -―
→（The denitrification stage）NO2 -→N2↑。
In traditional nitration processes, a straight grip ammonia exhaustive oxidation is into nitrate（NH4 +―→NO2 -―→NO3 -）, main mesh
Be eradicate nitrogen aerobic ability and avoid nitrite to biology toxic action.But in denitrogenation of waste water, nitre
Change stage control in nitrous acid phase, entire bioanalysis denitrification process is made to pass through NH4 +―→NO2 -―→N2↑ such approach is complete
Into this method is exactly short-cut nitrification and denitrification bioanalysis denitrogenation.Compared to traditional biological method denitrogenation, this method has：In nitre
The change stage reduces NO2 -―→NO3 -Process, reduce 25% oxygen demand, reduce energy consumption；Reduce in the denitrification stage
NO3 -―→NO2 -Process, reduce the dosage of organic carbon source（Methanol consumption amount saves 40%）, reduce operating cost；Contracting
Short reaction process, shortens the reaction time, can reduce reactor volume, reduces investment operating cost.
At present, China's overwhelming majority sewage treatment plant BOD5/ TN and COD/TN is past to ensure standard water discharge than relatively low
Carbon source is additionally added toward needs, operation debugging needs professional's control, and operational management is extremely complex, causes operation cost significantly
Increase.
The content of the invention
To solve the above-mentioned problems, the present invention provides the life that a kind of sequencing batch active sludge realizes short-cut nitrification and denitrification
Object denitrogenation technology can be achieved with short-cut nitrification and denitrification process by simply controlling.The technical solution of use is as follows：
Sequencing batch active sludge realizes the biological denitrification method of short-cut nitrification and denitrification, including intaking, being aerated aerobic nitrification, stir
Anoxic denitrification is mixed, aerobic nitrification is aerated again, is stirred for short-time aeration stripping N2, precipitation, draining；It is each aerobic, scarce in cycle
The reaction time in oxygen stage controls in real time according to the changing features of DO, ORP, pH parameter.
Preferably, the water inlet is using instant water coming-in mode, when sewage when the sequencing batch active sludge cycle starts one
Secondary addition.
Preferably, the aeration supports mode using immobilized film amount, and aeration quantity size is adjusted by frequency conversion air blower, is aerated
Time obtains feedback information On-line Control by DO.
Preferably, this stage of aerobic nitrification is aerated, ammonia nitrogen gradually decreases, and nitrite nitrogen gradually increases；DO and ORP exist
Rise, pH value slowly decline；When pH value has dropped 0.4-0.5, stop aeration.
Preferably, in second Yi Shang aerobic nitrification stage, pH falls can select 0.8-1.0, in being controlled with this
Between aerobic time each time.
Preferably, the stirring anoxic denitrification stage is：The nitrite nitrogen for being aerated the generation of aerobic nitrification stage is thin through denitrification
Bacterium effect is completely reduced；When ORP significantly declines rapidly, there is elbow point, while pH stable, show that denitrification terminates.
Preferably, then it is aerated the aerobic nitrification stage and is：Start to be aerated again, start the nitration reaction of second stage, until ammonia
Nitrogen is all aoxidized；Since denitrification process before this compensates for basicity deficiency in raw water, make second stage nitrifying process
In have enough basicity, when ammonia nitrogen is reduced to 0mg/L, still have surplus alkalinity in mixed liquor, continue to be aerated, pH value raises suddenly,
DO is also significantly raised, and DO shows that nitration reaction terminates with being risen to simultaneously on pH value curve.
Preferably, water temperature control is at 25-30 DEG C or so, pH 7.5-8.5, and the N0 during nitration reaction3-N/NOx-N
Always below 5%.
Beneficial effects of the present invention：
（1）The present invention can control the reaction time in SBR alternating oxic-anoxics each stage in real time, solve automatically controlling for SBR
Problem；And above-mentioned real-time control method is taken, terminate to be aerated in time, and water temperature is controlled at 25-30 DEG C or so, it avoids in system
Inside turn out Nitromonas.
（2）N0 during the nitration reaction of the present invention3- N/NOx-N below 5%, ensure that short-cut nitrification and denitrification always
Stable operation.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
Embodiment 1
Using certain lithium electricity production and living waste water as experimental subjects（COD concentration 310mg/L, ammonia nitrogen 93mg/L, basicity 530mg/L,
Monitor DO, ORP and pH value on-line）.
Sanitary wastewater enters sbr reactor device, opens aerator, is the aeration aerobic nitrification stage in preceding 100min, ammonia nitrogen by
Decrescence few, nitrite nitrogen gradually increases.This stage, DO and ORP are being raised, and pH value slowly declines (nitrifying process consumption alkali
Degree).In 100 min, stop aeration and start to stir.Due to also having substantial amounts of ammonia nitrogen, the first rank in mixed liquor at this time
Before section aeration terminates, DO can only artificially stop being aerated, start anoxic denitrification with not having inflection point appearance on pH value curve.
After denitrification starts, DO is reduced to rapidly zero, ORP rapid decreases, and pH value quickly raises (denitrification generation basicity).When
When the nitrite nitrogen that first stage nitrification generates is completely reduced, ORP significantly declines rapidly, elbow point occurs, while pH value is steady
It is fixed, show that denitrification terminates.
Then, and start to be aerated, start the aerobic nitrification reaction of second stage, until ammonia nitrogen is all aoxidized.Due to
Denitrification process before this compensates for basicity deficiency in raw water, makes have enough basicity in second stage nitrifying process, works as ammonia
When nitrogen is reduced to 0mg/L, still there is surplus alkalinity in mixed liquor, continue to be aerated（3min）Stripping N2, pH value raises suddenly, and DO is also significantly
Degree rise, DO show that nitration reaction terminates with being risen to simultaneously on pH value curve.Then precipitate（30min）, draining
（10min）, so far, denitrogenation terminates.
Compared with first stage nitration reaction, the amplitude that pH declines in second stage nitrifying process substantially increases, lower reduction of speed
Degree is apparent to be accelerated.This is because HCO hastacines degree is lower than first stage during second stage nitration reaction.First stage nitrification is anti-
PH value is answered to decline 0.3, second stage nitration reaction pH value declines 0.9.After second stage nitration reaction, start the anti-nitre of anoxic
Change.When nitrate nitrogen reaches 0 mg/L, occur elbow point C2 on ORP curves, while pH value tends towards stability, and shows that denitrification terminates,
Stop stirring.So far, the entire reaction process of SBR alternating oxic-anoxics terminates.
Determine the mainly nitration reaction of alternating oxic-anoxic total reaction time, because in denitrifying carbon source abundance, instead
It is relatively short to nitrify the time.Denitrification each time just stops stirring until nitrate nitrogen is completely reduced.Therefore, no matter replace
Several times, denitrification can control hypoxic exposure to oxygen Anoxic according to the appearance of elbow point on ORP curves each time.And for
Nitration reaction, only last time nitration reaction, make ammonia nitrogen all be aoxidized, and are risen on DO and pH change curves, can be with
According to the time control last time aerobic time for rising to appearance.Nitration reaction before this, can be according to nitration reaction mistake
The fall control reaction time of pH value in journey.0.4-0.5 may be selected in first time nitration reaction pH fall, i.e., nitrification is anti-
When pH value has dropped 0.4-0.5 after should starting, stop aeration, start denitrification.If the cycle-index of alternating oxic-anoxic surpasses
After twice, since the pH value decrease speed of intermediate nitration reaction each time is larger, pH falls can select 0.8-
1.0, intermediate aerobic time each time is controlled with this.
More than control strategy is taken, the reaction time in SBR alternating oxic-anoxics each stage can be controlled in real time, is solved
SBR's automatically controls problem.Nitration reaction is not the fixed hydraulic detention time (HRT) of setting, but according to raw water ammonia nitrogen
The variation On-line Control reaction time of concentration.In fact, the process that ammonia nitrogen is oxidized to nitrite nitrogen by nitrococcus is thoroughly complete
Into, and the process that nitrite nitrogen is oxidized to nitrate nitrogen by Nitromonas is not properly completed.If extending aeration time, accumulation
Nitrite will be oxidized to nitrate, and Nitromonas is turned out in system.Therefore, above-mentioned real-time controlling party is only taken
Method terminates to be aerated in time, and water temperature is controlled at 25-30 DEG C or so, pH7.5-8.5 or so, avoids turning out nitre in system
Sour bacterium.The N0 during nitration reaction3-N/NOx- N below 5%, ensure that the stable operation of short-cut nitrification and denitrification always.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should all be included in the protection scope of the present invention.
Claims (8)
1. sequencing batch active sludge realizes the biological denitrification method of short-cut nitrification and denitrification, which is characterized in that including intaking, exposing
Gas aerobic nitrification, stirring anoxic denitrification are aerated aerobic nitrification, are stirred for short-time aeration stripping N again2, precipitation, draining；Cycle
Interior each aerobic, anoxic phases reaction time controls in real time according to the changing features of DO, ORP, pH parameter.
2. sequencing batch active sludge according to claim 1 realizes the biological denitrification method of short-cut nitrification and denitrification,
It is characterized in that, the water inlet is once added in using instant water coming-in mode when sewage when the sequencing batch active sludge cycle starts.
3. sequencing batch active sludge according to claim 1 realizes the biological denitrification method of short-cut nitrification and denitrification,
Be characterized in that, the aeration supports mode using immobilized film amount, and aeration quantity size adjusts by frequency conversion air blower, aeration time by
DO obtains feedback information On-line Control.
4. sequencing batch active sludge according to claim 1 realizes the biological denitrification method of short-cut nitrification and denitrification,
It is characterized in that, be aerated this stage of aerobic nitrification, ammonia nitrogen gradually decreases, and nitrite nitrogen gradually increases；DO and ORP is being raised,
PH value slowly declines；When pH value has dropped 0.4-0.5, stop aeration.
5. sequencing batch active sludge according to claim 4 realizes the biological denitrification method of short-cut nitrification and denitrification,
It is characterized in that, second of Yi Shang aerobic nitrification stage, pH falls can select 0.8-1.0.
6. sequencing batch active sludge according to claim 1 realizes the biological denitrification method of short-cut nitrification and denitrification,
Be characterized in that, stirring the anoxic denitrification stage be：The nitrite nitrogen that the aeration aerobic nitrification stage generates is acted on through denitrifying bacteria
It is completely reduced；When ORP significantly declines rapidly, there is elbow point, while pH stable, show that denitrification terminates.
7. sequencing batch active sludge according to claim 1 realizes the biological denitrification method of short-cut nitrification and denitrification,
It is characterized in that, then is aerated the aerobic nitrification stage to be：Start to be aerated again, start the nitration reaction of second stage, until ammonia nitrogen is whole
It is aoxidized；Since denitrification process before this compensates for basicity deficiency in raw water, make have foot in second stage nitrifying process
Enough basicity when ammonia nitrogen is reduced to 0mg/L, still has surplus alkalinity in mixed liquor, continues to be aerated, and pH value raises suddenly, and DO is also big
Amplitude raises, and DO shows that nitration reaction terminates with being risen to simultaneously on pH value curve.
8. the biological denitrificaion of short-cut nitrification and denitrification is realized according to claim 1-7 any one of them sequencing batch active sludge
Method, which is characterized in that water temperature is controlled at 25-30 DEG C or so, pH 7.5-8.5, and the N0 during nitration reaction3-N/NOx-
N is always below 5%.
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| CN112591875A (en) * | 2020-11-02 | 2021-04-02 | 中车唐山机车车辆有限公司 | Industrial wastewater treatment method |
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