CN101857337A - Treatment method for biological nitrogen removal of reinforced sewage - Google Patents

Treatment method for biological nitrogen removal of reinforced sewage Download PDF

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CN101857337A
CN101857337A CN 201010144467 CN201010144467A CN101857337A CN 101857337 A CN101857337 A CN 101857337A CN 201010144467 CN201010144467 CN 201010144467 CN 201010144467 A CN201010144467 A CN 201010144467A CN 101857337 A CN101857337 A CN 101857337A
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aerobic
anoxic
sewage
denitrification
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CN101857337B (en
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郭兴芳
陈立
李成江
孔祥媚
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China public works North China design studies Zong Yuan company limited
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North China Municipal Engineering Design and Research Institute Co Ltd
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Abstract

The invention discloses a treatment method for biological nitrogen removal of reinforced sewage, which comprises the following steps of: 1, feeding all or partial treated sewage and sludge refluxed from a secondary sedimentation tank into a reflux sludge denitrification unit together by adopting division point inflow; 2, feeding the outflow of the reflux sludge denitrification unit and the residual sewage to an anaerobic unit or an anoxic unit; 3, feeding the outflow of the anaerobic unit to the anoxic unit, and refluxing the mixed solution of an aerobic unit to the anoxic unit; 4, feeding the outflow of the anoxic unit to a transition unit; 5, feeding the outflow of the transition unit to the aerobic unit, and refluxing the mixed solution of the aerobic unit to the anoxic unit from the outflow end of the aerobic unit; and 6, feeding the outflow of the aerobic unit to the secondary sedimentation tank to perform sludge-water separation. The method can be operated in multiple modes of A-A2O, nitrogen removal AO, inverse AAO and the like and has high controllability, and a system has strong nitrogen removal capability. The method is suitable for upgrade and reform of newly built sewage treatment plants of towns lacking the land and the conventional sewage treatment plants.

Description

A kind of treatment process of enhancing sewage biological denitrogenation
Technical field:
The invention belongs to the environment protection technical field of sewage, be specifically related to a kind of treatment process of enhancing sewage biological denitrogenation.
Background technology:
Along with increasing of China's rapid economy development and population, water environment pollution presents certain aggravation trend, the body eutrophication phenomenon increases the weight of, the emission standard of urban wastewater treatment firm pollutent is more and more stricter for this reason, nitrogen phosphorus index particularly, and along with the raising of economic level and people's quality of life and the enhancing of environmental consciousness, emission standard can improve constantly.This just means that the newly-built sewage work of China, existing sewage work have proposed more and more higher requirement to denitrogenation dephosphorizing.Dephosphorization is by the excessive suction phosphorus of releasing phosphorus and aerobic microbiological of anaerobion, phosphorus in the sewage is transferred in the mud, then rich phosphorus sludge is discharged to outside the system, realize biological phosphate-eliminating, when biological phosphate-eliminating can not satisfy the emission standard of phosphorus, be aided with and add chemical agent and impose chemical dephosphorization.Denitrogenation is converted into nitrogen by the denitrification of denitrifying bacteria under the nitrification of nitrobacteria under aerobic environment and the anoxia condition with organonitrogen in the sewage and nitrogen compound, discharges into the atmosphere.Compare with dephosphorization, because nitrogen compound is (as NH 4 +And NO 3 -) molecular weight ratio less, can't remove by adding medicament, impose chemical denitrogenation.Adopt membrane technique to remove nitrogen compound, only reverse osmosis membrane technology is effectively, and other membrane technology all can't effectively remove nitrogen compound in the sewage as micro-filtration, nanofiltration etc., but this method cost is too expensive, is difficult to apply.In addition, the blow-off method denitrification, these method expenses such as ion exchange method removal ammonia nitrogen are also higher, are difficult to use in the extensive processing of sewage.Therefore, sewage denitrification and dephosphorization, particularly denitrogenation, present main stream approach is a biological method.
Biological carbon and phosphorous removal relates to that microorganism is nitrated, denitrification, release phosphorus and inhale processes such as phosphorus, need spatially or the time is gone up anaerobism, anoxic, the condition such as aerobic created, nitrated, denitrification, release phosphorus, inhale these processes of phosphorus to microorganism composition, matrix type and envrionment conditions require different, in same sewage treatment process system, various contradictory relations have been produced inevitably, as denitrification with release the competition of phosphorus to carbon source, the contradiction that denitrogenation and dephosphorization require mud age etc.Present biological denitrification phosphorous removal technique has AO, AAO, has the improvement SBR technology and the oxidation ditch process of denitrogenation dephosphorizing function, and the improvement AAO that proposes for resolving contradiction, inversion A AO, UCT, technologies such as MUCT, JHB.These technologies are difficult to obtain simultaneously the efficient removal of nitrogen, phosphorus in the practical application, often occur denitrification effect when good phosphor-removing effect relatively poor, and phosphor-removing effect not good situation of denitrification effect when good when coming the fluctuation of water water quality and quantity big, is difficult to guarantee effluent quality.The actual C/N of China's town sewage is lower than generally at present, and by this situation ubiquity of biological carbon and phosphorous removal poor effect that low carbon source situation causes, it is the barrier that biological denitrificaion efficient can't improve that organic carbon source lacks.Therefore, concerning China, the sewage disposal denitrogenation dephosphorizing, no matter newly-built sewage work still has carrying of sewage work now is marked transformation, and difficulty is in denitrogenation.
Traditional biological denitrificaion is made up of nitrifying process and denitrification process two portions, because under the low-temperature condition, the nitrification and denitrification bacterial activity reduces, speed of reaction is low, propagation slowly, cause the nitrification and denitrification reaction to be carried out slowly, denitrogenation is restricted, and this is the technological difficulties that traditional activated sludge process can't be avoided and solve always.Reach effective denitrogenation, need to increase the pond at least and hold, prolong the nitrated time.This just means that this takes up an area of and the limited urban wastewater treatment firm of treatment capacity for those on the one hand, need hold under the constant situation biological nitration function and the denitrification function of the consolidation system of taking measures, the denitrogenation ability of enhanced system in the total pond of system.Need the handiness of entire sewage treatment system technology self higher on the other hand, the operation controllability is stronger, can be according to coming regimen condition, processing requirements, envrionment conditions etc. to adjust flexibly, biological denitrification process is carried out efficiently, stably controls, even condition changes, also can adjust and control the biological denitrificaion function of coming consolidation system by local.
Summary of the invention:
Purpose of the present invention just is to overcome above-mentioned the deficiencies in the prior art, and a kind of treatment process of enhancing sewage biological denitrogenation is provided, this method can be neatly to the biological denitrification process of system carry out efficiently, control stably.
As above design, technical scheme of the present invention is: a kind of treatment process of enhancing sewage biological denitrogenation, carry out according to the following step: (1) adopts the branch water inlet with treated sewage, the all or part of mud that refluxes together with second pond together enters returned sluge denitrification unit, and the nitrate-nitrogen reduction that denitrifying bacteria utilizes the carbon source in the sewage that returned sluge is brought into is nitrogen; (2) the returned sluge denitrification is unitary goes out stream and remaining sewage enters anaerobic unit or enters anoxic unit; (3) anaerobic unit go out to flow to into anoxic unit, simultaneously the mixed solution of aerobic unit also is back to anoxic unit, the nitrate-nitrogen reduction that will come by mixed-liquor return in anoxic unit is that nitrogen carries out denitrogenation; (4) anoxic unit go out to flow to into transition element, transition element inside is provided with aerator, agitator or thruster; (5) transition element go out to flow to into aerobic unit, the main nitrification that takes place in aerobic unit, the ammonia nitrogen under aerobic conditions in the oxidation sewage is removed the part organic pollutant simultaneously; The mixed solution of aerobic unit is back to anoxic unit from the stream end that goes out of aerobic unit; (6) the going out to flow to into second pond and carry out mud-water separation of aerobic unit, the sludge part that precipitates is back to returned sluge denitrification unit, remaining mud discharging, the water outlet discharging of post precipitation.
Above-mentioned branch water inlet can be adopted 2 water inlets, and returned sluge denitrification unit, anaerobic unit, anoxic unit are equipped with the sewage admission port, and treated sewage 0%~30% enters returned sluge denitrification unit, and 100%~70% enters anaerobic unit; Or 30%~50% enter returned sluge denitrification unit, and 70%~50% enters anoxic unit.
Above-mentioned anoxic unit can adopt activated sludge process, also can adopt active sludge and the microbial film compound technology that adds artificial floating stuffing; Add the pond when adopting recombining process and hold 10%~50% artificial floating stuffing, go out the stream place blocking apparatus is set.
The end additional carbon that becomes a mandarin of above-mentioned anoxic unit.
Above-mentioned returned sluge denitrification unit end and the anoxic unit end that becomes a mandarin that becomes a mandarin is equipped with aerobic unit mixed-liquor return point.
Above-mentioned transition element can be used as aerobic unit, and according to the aerobic condition operation, the performance nitrification is removed ammonia nitrogen; Also can be used as anoxic unit, according to the anoxia condition operation, oxidation state nitrogen is removed in the performance denitrification; Can adopt and add artificial floating stuffing or embedding bacterium and active sludge compound technology.
Above-mentioned aerobic unit can all adopt microbial film or embedding bacterium and the active sludge compound technology that adds artificial floating stuffing, and is going out the blocking apparatus that Liu Chu is provided with filler or embedding bacterium.
Above-mentioned aerobic unit first half can adopt microbial film or embedding bacterium and the active sludge compound technology that adds artificial floating stuffing, and latter half adopts activated sludge process, and at the blocking apparatus that Liu Chu is provided with filler or embedding bacterium that goes out of first half; The aerobic unit first half go out to flow to into the aerobic unit latter half, mixed-liquor return is told the stream end from aerobic unit latter half of and is back to anoxic unit.
The rate of adding of above-mentioned artificial floating stuffing or embedding bacterium is respectively fills 20-50%, the 5-20% that the pond holds.
In the above-mentioned aerobic unit or water outlet place of aerobic unit can add the dephosphorization medicament.
The present invention has following advantage and positively effect:
1, handiness is big, controllability is high.On the one hand, can different operational modes be set flexibly according to processing target and processing requirements and envrionment conditions etc.As be the enhanced biological denitrogenation, can be by the AO mode operation of denitrogenation; Also can be according to the AAO mode operation of 2 water inlets; Also can be enhanced biological phosphorus removal, is the inversion A AO mode operation of A-AAO and 2 water inlets by the AAO mode operation of improveing; AAO mode operation that also can be routinely.Summer, water temperature was higher for another example, and the nitrification activity of active sludge is higher, and aerobic unit can satisfy nitrification tank and hold requirement, and transition element is then pressed the anoxia condition operation, performance denitrification, the denitrification functions of consolidation system; And water temperature in winter is lower, and nitrated microorganism nitrification activity is lower, and aerobic unit can not satisfy nitrification tank and hold requirement, and transition element is then pressed the aerobic condition operation, performance nitrification, the nitrification function of consolidation system; On the other hand, can determine the dosage of hand-stuff or embedding bacterium flexibly: when load is higher, improve the rate that adds of filler or embedding bacterium according to influent ammonia nitrogen load height; When load is low, reduce the rate that adds of filler or embedding bacterium; The aerobic unit of Sludge System can reduce aeration rate, make full use of composite system and go out the high-solubility oxygen that stream is brought into, reduce the part energy consumption, mixed-liquor return is held from the stream that goes out of Sludge System aerobic unit simultaneously, can not influence the denitrification of anoxic unit because of the mixed-liquor return of composite system high-solubility oxygen; Moreover, the composite system of this processing method is mainly brought into play nitrification, filler adheres nitrifier or embedding nitrifier are in the aerobic environment all the time, and can not run off with going out stream, its mud can separate fully with suspension growth mud of dephosphorization bacterial in Sludge System age age, can be according to dephosphorization needs and running situation etc., the short mud of control age etc. flexibly, consolidation system biological phosphate-eliminating.
2, system's denitrogenation ability is strong.On the one hand, anoxic unit and aerobic unit all adopt the recombining process of suspension microorganism (active sludge) and set microorganism, add artificial floating stuffing (or add embedding bacterium at aerobic unit), can growth bring into play the obligate set microorganism of single-minded effect on the inherent filler of system separately (if aerobic unit adds the embedding bacterium, the bacterium that the embedding of embedding carrier is single-minded) is the set nitrifier, the set microorganism of these obligates can not run off with going out stream, all the time be in the single-minded environment separately, can not resemble the denitrifying bacteria and the nitrifier of suspension, with going out to flow continuous conversion anaerobism, anoxic, aerobic environment, therefore its activity is stronger, single-minded effect is brought into play byer force, promptly the denitrification of system and nitrification are stronger separately, and the denitrogenation ability of total system is better; On the other hand, anoxic unit and aerobic unit adopt the recombining process of suspension microorganism (active sludge) and set microorganism, double oxygen bacterium and the nitrifier of aerobic unit filler adheres microbial film set or the nitrifiers of embedding such as denitrification of the set of anoxic unit filler adheres microbial film, intrasystem denitrifying bacteria total amount and nitrifier total amount have been increased, and can not run off with going out stream, denitrification rate and nitrated rate have been improved, simultaneously, its active temperature influence of the microorganism of set is lower than the suspension microorganism, and the denitrification function of system and nitrification function can not be subjected to big impact variation because of the variation of envrionment temperature; Moreover according to influent quality and envrionment conditions and water outlet situation, transition element can be given full play to its nitrated or denitrification function, with the denitrogenation ability of consolidation system; Simultaneously, the entire treatment system can move by the AO of denitrogenation, also can be according to the AAO mode operation (being that raw waste water enters anaerobism, two unit of anoxic according to a certain percentage respectively) of 2 water inlets, strengthened denitrification in case of necessity; In addition, according to the active situation of water-inlet carbon source situation and denitrifying bacteria, additional carbon flexibly, consolidation system denitrification functions.
3, this processing method newly-built sewage work in cities and towns of not only being suitable for the soil anxiety is particularly suited for existing excess load or does not have nitrated ability or the upgrading of nitrated indifferent sewage work.
Description of drawings:
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the floor map of Wuxi, Jiangsu Province sewage disposal upgrading project.
Fig. 3 is the leading indicator of Inlet and outlet water before experimental example 1 certain sewage disposal upgrading project reconstruction.
Fig. 4 is the leading indicator of Inlet and outlet water after experimental example 1 certain sewage disposal upgrading project reconstruction.
Fig. 5 is the AO art breading water quality leading indicator that experimental example 2 adds the embedding nitrifier.
Embodiment:
A kind of treatment process of enhancing sewage biological denitrogenation, carry out according to the following step:
(1) 0~30% mud that refluxes together with second pond of the sewage of handling through facilities such as fine fack, settling pits together enters returned sluge denitrification unit, in returned sluge denitrification unit, the nitrate-nitrogen reduction that denitrifying bacteria utilizes the carbon source in the sewage that returned sluge is brought into is nitrogen, eliminates nitric nitrogen follow-up anaerobic unit is released the influence that the phosphorus bacterium is released phosphorus;
(2) the unitary sewage that goes out stream and 70%~100% of returned sluge denitrification enters anaerobic unit, mainly releases the phosphorus effect in anaerobic unit, and the phosphorus bacterium of releasing in the active sludge mainly utilizes the carbon source utilized in the raw waste water to release phosphorus;
(3) anaerobic unit go out to flow to into anoxic unit, simultaneously the mixed solution of aerobic unit also is back to anoxic unit.Anoxic unit can adopt activated sludge process, also can adopt active sludge and the biomembranous recombining process that adds artificial floating stuffing.Add the pond when adopting recombining process and hold 10%~50% artificial floating stuffing, go out the stream place blocking apparatus such as interception net are set.The denitrifying bacteria that suspension denitrifying bacteria in the anoxic unit active sludge and hand-stuff microbial film adhere to mainly utilizes and can utilize carbon source to carry out denitrification in the sewage, and the nitrate-nitrogen reduction that will come by mixed-liquor return is that nitrogen carries out denitrogenation.Under winter low water temperature situation, denitrifying bacteria is active to be reduced, and is to improve denitrification rate, or low carbon source can not satisfy biological denitrificaion and take, at the end additional carbon that becomes a mandarin of anoxic unit, as methyl alcohol and/or acetate etc., strengthened denitrification;
(4) anoxic unit goes out to flow to into transition element.According to influent quality and processing requirements and envrionment conditions etc., transition element can be used as aerobic unit or anoxic unit operation, brings into play nitrification and denitrification respectively.When the transition unit is aerobic unit, open aerator oxygenation (but in case of necessity also turn on agitator or thruster), the nitrifier in the active sludge is oxidized to nitric nitrogen with the ammonia nitrogen in the sewage under aerobic conditions, remove the part organic pollutant simultaneously; When the transition unit is anoxic unit, close aerator or aeration rate to very little, turn on agitator or thruster are created anoxia condition, and the denitrifying bacteria in the active sludge utilizes the carbon source in the sewage to continue the nitrate-nitrogen reduction in the mixed solution is nitrogen; Transition element can adopt and add artificial floating stuffing or embedding bacterium and active sludge compound technology.
(5) transition element go out to flow to into aerobic unit, aerobic unit can all adopt microbial film or embedding bacterium and the active sludge compound technology that adds artificial floating stuffing, and is going out the blocking apparatus that Liu Chu is provided with filler or embedding bacterium.
Aerobic unit can also adopt first half to adopt to add microbial film or embedding bacterium and the active sludge compound technology of artificial floating stuffing, latter half employing activated sludge process, and at the blocking apparatus that Liu Chu is provided with filler or embedding bacterium that goes out of first half; The aerobic unit first half go out to flow to into the aerobic unit latter half, mixed-liquor return is told the stream end from aerobic unit latter half of and is back to anoxic unit.
The main nitrification that takes place in aerobic unit, nitrifier that nitrifier that suspends in the active sludge and carrier biofilm adhere to or the embedding nitrifier ammonia nitrogen in the oxidation sewage under aerobic conditions, simultaneously aerobic heterotrophic microorganism is removed the part organic pollutant.Adopt the situation of composite system for the part aerobic unit, transition element go out to flow to aerobic unit into composite system, the aeration rate of composite system is generally than simple Sludge System height, the filler of composite system or embedding bacterium are tackled through blocking apparatus, it goes out to flow to the aerobic unit into active sludge, and mixed-liquor return goes out the stream end and refluxes from active sludge aerobic is unitary;
The rate of adding of above-mentioned artificial floating stuffing or embedding bacterium is respectively fills 20-50%, the 5-20% that the pond holds.
(6) the going out to flow to into second pond and carry out mud-water separation of aerobic unit, the sludge part that precipitates is back to returned sluge denitrification unit, remaining mud discharging, the water outlet discharging of post precipitation.When biological phosphate-eliminating can not satisfy water outlet phosphorus emission standard, when being used for denitrogenation more, in aerobic unit, add the dephosphorization medicament as the carbon source in winter enhanced biological denitrogenation or the sewage, implement chemical dephosphorization.
Embodiment 1: carbon source is relatively sufficient, when water temperature is higher, press the A-AAO mode operation.30% and returned sluge of the sewage of handling through facilities such as fine fack, settling pits enter 1. returned sluge denitrification unit, the unitary sewage that goes out stream and 70% of returned sluge denitrification enters 2. anaerobic unit, the backflow mixed liquor that goes out stream and aerobic unit of anaerobic unit enters 3. active sludge and biomembranous anoxic recombiner unit, the anoxic recombiner unit adds 20% artificial floating stuffing, and goes out the stream place blocking apparatus such as interception net etc. is set.Anoxic unit go out to flow to into the 4. transition element of active sludge, transition element go out to flow to into the 5. aerobic recombiner unit of active sludge and microbial film or embedding bacterium, aerobic recombiner unit adds 20% artificial floating stuffing, and it goes out Liu Chu and is provided with blocking apparatus such as screen cloth.Aerobic recombiner unit go out to flow to into the 6. aerobic unit of active sludge, aerobic unit go out to flow to into 6. second pond, the water outlet discharging of second pond, the part mud discharging, part mud refluxes.
Embodiment 2: carbon source is relatively sufficient, when water temperature is not high, press the A-AAO mode operation.10% and returned sluge of the sewage of handling through facilities such as fine fack, settling pits enter 1. returned sluge denitrification unit, the unitary sewage that goes out stream and 90% of returned sluge denitrification enters 2. anaerobic unit, the backflow mixed liquor that goes out stream and aerobic unit of anaerobic unit enters 3. active sludge and biomembranous anoxic recombiner unit, the anoxic recombiner unit adds 40% artificial floating stuffing, and goes out the stream place blocking apparatus such as interception net etc. is set.The anoxic recombiner unit go out to flow to into the 4. transition element of active sludge, transition element go out to flow to into 5. active sludge and biomembranous aerobic recombiner unit, aerobic recombiner unit adds 45% artificial floating stuffing and its and goes out Liu Chu and be provided with blocking apparatus such as screen cloth.Aerobic recombiner unit go out to flow to into 6. second pond, the water outlet of second pond discharging, the part mud discharging, part mud refluxes.
Embodiment 3: when carbon source is not enough, by denitrogenation AO mode operation.The sewage of handling through facilities such as fine fack, settling pits and the returned sluge of second pond and the backflow mixed liquor of aerobic unit enter 1. returned sluge denitrification unit, the anaerobic unit of flowing through successively 2., 3. active sludge and microbial film compound anoxic unit and 4. transition element.Anoxic unit adds 20%~40% artificial floating stuffing, and goes out the stream place blocking apparatus such as interception net etc. is set.According to water-inlet carbon source and the required carbon source of denitrogenation etc., end additional carbon methyl alcohol and/or acetate etc. but returned sluge denitrification unit becomes a mandarin.Transition element can adopt active sludge and biomembranous recombining process, also can adopt Activated Sludge Process, if adopt recombining process, then adds 10%~50% artificial floating stuffing, goes out the stream place device intercepting padding materials such as interception net are set.Transition element goes out to flow to into 5. aerobic recombiner unit, and aerobic recombiner unit can all adopt the recombining process of active sludge and microbial film or embedding bacterium, but also fore portion adopts recombining process, and activated sludge process is adopted in the rear section.The rate of adding of artificial floating stuffing or embedding bacterium is respectively 20%~50% and 5%~25%, and recombiner unit goes out Liu Chu and is provided with blocking apparatus such as screen cloth.Add chemical agent in the aerobic unit, water outlet enters 6. second pond, the water outlet discharging of second pond, and the part mud discharging, part mud refluxes.
Embodiment 4: when the carbon source deficiency can not satisfy the required carbon source of biological carbon and phosphorous removal simultaneously, by the AAO mode operation of 2 water inlets.The returned sluge of 30%~50% and second pond of the sewage of handling through facilities such as fine fack, settling pits enters 1. returned sluge denitrification unit, the 2. anaerobic unit of flowing through successively, the backflow mixed liquor of 70%~50% and the aerobic unit that go out stream and sewage of anaerobic unit enter 3. active sludge and microbial film compound anoxic unit and 4. transition element.Anoxic unit adds 20%~40% artificial floating stuffing, and goes out the stream place blocking apparatus such as interception net etc. is set.According to water-inlet carbon source and the required carbon source of denitrogenation etc., end additional carbon methyl alcohol and/or acetate etc. but anoxic unit becomes a mandarin.Transition element can adopt active sludge and biomembranous recombining process, also can adopt Activated Sludge Process, if adopt recombining process, then adds 10%~50% artificial floating stuffing, goes out the stream place device intercepting padding materials such as interception net are set.Transition element goes out to flow to into 5. aerobic recombiner unit, and aerobic recombiner unit can all adopt the recombining process of active sludge and microbial film or embedding bacterium, but also fore portion adopts recombining process, and activated sludge process is adopted in the rear section.The rate of adding of artificial floating stuffing or embedding bacterium is respectively 20%~50% and 5%~25%, and recombiner unit goes out Liu Chu and is provided with blocking apparatus such as screen cloth.Add chemical agent in the aerobic unit, water outlet enters 6. second pond, the water outlet discharging of second pond, and the part mud discharging, part mud refluxes.
Embodiment 5: when the nitrogen ratio is not high, by inverted AAO mode operation.The sewage of handling through facilities such as fine fack, settling pits and the returned sluge of second pond enter 1. returned sluge denitrification unit, the anaerobic unit of flowing through successively 2., 3. active sludge and microbial film compound anoxic unit.Anoxic unit adds 10%~50% artificial floating stuffing, and goes out the stream place blocking apparatus such as interception net etc. is set.According to water-inlet carbon source and the required carbon source of denitrogenation etc., end additional carbon methyl alcohol and/or acetate etc. but anoxic unit becomes a mandarin.Anoxic unit go out to flow to into 4. transition element, transition element can adopt active sludge and biomembranous recombining process, also can adopt activated sludge process, go out to flow to into 5. aerobic unit, aerobic unit can all adopt the recombining process of active sludge and microbial film or embedding bacterium, also but fore portion adopts recombining process, and activated sludge process is adopted in the rear section.The rate of adding of artificial floating stuffing or embedding bacterium can adopt 20%~50% and 5%~20%, and recombiner unit goes out Liu Chu and is provided with blocking apparatus such as screen cloth.According to water outlet phosphorus situation and emission standard, the stream that goes out of aerobic unit adds chemical agent or does not add, go out to flow to into 6. second pond, and the water outlet discharging of second pond, the part mud discharging, part mud refluxes.
Experimental example 1:
Certain sewage disposal upgrading project, treatment scale 20 * 10 4m 3/ d, original technology is AAO technology, and the water outlet emission standard is the one-level B of GB18918-2002, now requires water outlet to be upgraded to one-level A standard, and TN carries out the provincial standard DB321072-2007 of Jiangsu Province.Original biological treatment part anaerobism, anoxic, the aerobic three unitary residence time are respectively 1.0h, 2.5h, 6.6h, the modification scheme of taking is that aerobic unit adds artificial floating stuffing, dwindling Aerobic Pond holds, increasing anoxic pond simultaneously holds, the improved aerobic recombiner unit that partly is followed successively by anaerobic unit, anoxic unit, transition element, adds filler, the aerobic unit that does not add filler of carrying out a biological disposal upon, the residence time is respectively 1.0h, 4.1h, 1.0h, 3.1h, 1.0h, and the artificial floating stuffing rate of adding is 30%.According to different situations, improved biological treatment part can be moved by AAO, also can also can move by the AO of denitrogenation by being inverted the AAO operation, and the floor map of its biological treatment is seen Fig. 2.Back water outlet COD, NH are transformed in Inlet and outlet water data such as table 1 and 2 before and after transforming 3-N, TN, TP concentration all reduce, and clearance all improves, and particularly to the removal of nitrogen, transform back water outlet NH 3-N concentration is lower than 5mg/L always.
Experimental example 2:
Adopt Aerobic Pond to add the water inlet of the AO art breading municipal sewage plant of embedding nitrifier, the residence time of anoxic pond, Aerobic Pond is respectively 4.5h, 3.0h, sludge concentration MLSS is respectively 4000~5000mg/L, 2800~3500mg/L, the sludge age SRT of system is 15~20d, return sludge ratio 200%, the rate of adding of embedding nitrifier are 10%.In water temperature is 12.0~17.2 ℃, water inlet COD, NH 3-N load is respectively 0.38~1.27kgCOD/m 3.d, 0.10~0.15kgNH 3-N/m 3.d under the situation, total system steady running, NH 3-N, TN have higher removal, and concrete data see Table 3.

Claims (10)

1. the treatment process of an enhancing sewage biological denitrogenation, carry out according to the following step: (1) adopts the branch water inlet with treated sewage, the all or part of mud that refluxes together with second pond together enters returned sluge denitrification unit, and the nitrate-nitrogen reduction that denitrifying bacteria utilizes the carbon source in the sewage that returned sluge is brought into is nitrogen; (2) the returned sluge denitrification is unitary goes out stream and remaining sewage enters anaerobic unit or anoxic unit; (3) anaerobic unit go out to flow to into anoxic unit, simultaneously the mixed solution of aerobic unit also is back to anoxic unit, the nitrate-nitrogen reduction that will come by mixed-liquor return in anoxic unit is that nitrogen carries out denitrogenation; (4) anoxic unit go out to flow to into transition element, transition element inside is provided with aerator, agitator or thruster; (5) transition element go out to flow to into aerobic unit, the main nitrification that takes place in aerobic unit, the ammonia nitrogen under aerobic conditions in the oxidation sewage is removed the part organic pollutant simultaneously; The mixed solution of aerobic unit is back to anoxic unit from the stream end that goes out of aerobic unit; (6) the going out to flow to into second pond and carry out mud-water separation of aerobic unit, the sludge part that precipitates is back to returned sluge denitrification unit, remaining mud discharging, the water outlet discharging of post precipitation.
2. the treatment process of a kind of enhancing sewage biological denitrogenation according to claim 1, it is characterized in that: above-mentioned branch water inlet can be adopted 2 water inlets, returned sluge denitrification unit, anaerobic unit, anoxic unit are equipped with the sewage admission port, treated sewage 0%~30% enters returned sluge denitrification unit, and 100%~70% enters anaerobic unit; Or 30%~50% enter returned sluge denitrification unit, and 70%~50% enters anoxic unit.
3. the treatment process of a kind of enhancing sewage biological denitrogenation according to claim 1 is characterized in that: above-mentioned anoxic unit can adopt activated sludge process, also can adopt active sludge and the microbial film compound technology that adds artificial floating stuffing; Add the pond when adopting recombining process and hold 10%~50% artificial floating stuffing, go out the stream place blocking apparatus is set.
4. according to the treatment process of claim 1 or 3 described a kind of enhancing sewage biological denitrogenations, it is characterized in that: the end additional carbon that becomes a mandarin of above-mentioned anoxic unit.
5. according to the treatment process of claim 1 or 3 described a kind of enhancing sewage biological denitrogenations, it is characterized in that: above-mentioned returned sluge denitrification unit end and the anoxic unit end that becomes a mandarin that becomes a mandarin is equipped with aerobic unit mixed-liquor return point.
6. the treatment process of a kind of enhancing sewage biological denitrogenation according to claim 1 is characterized in that: above-mentioned transition element can be used as aerobic unit, and according to the aerobic condition operation, the performance nitrification is removed ammonia nitrogen; Also can be used as anoxic unit, according to the anoxia condition operation, oxidation state nitrogen is removed in the performance denitrification; Can adopt and add artificial floating stuffing or embedding bacterium and active sludge compound technology.
7. the treatment process of a kind of enhancing sewage biological denitrogenation according to claim 1, it is characterized in that: above-mentioned aerobic unit can all adopt microbial film or embedding bacterium and the active sludge compound technology that adds artificial floating stuffing, and is going out the blocking apparatus that Liu Chu is provided with filler or embedding bacterium.
8. the treatment process of a kind of enhancing sewage biological denitrogenation according to claim 1, it is characterized in that: above-mentioned aerobic unit first half can adopt microbial film or embedding bacterium and the active sludge compound technology that adds artificial floating stuffing, latter half adopts activated sludge process, and at the blocking apparatus that Liu Chu is provided with filler or embedding bacterium that goes out of first half; The aerobic unit first half go out to flow to into the aerobic unit latter half, mixed-liquor return is told the stream end from aerobic unit latter half of and is back to anoxic unit.
9. the treatment process of a kind of enhancing sewage biological denitrogenation according to claim 1 is characterized in that: in the above-mentioned aerobic unit or water outlet place of aerobic unit can add the dephosphorization medicament.
10. according to the treatment process of claim 1 or 7 or 8 described a kind of enhancing sewage biological denitrogenations, it is characterized in that: the rate of adding of above-mentioned artificial floating stuffing or embedding bacterium is respectively fills 20-50%, the 5-20% that the pond holds.
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