CN102491604B - Multistage anaerobic/anoxic/oxic activated sludge process - Google Patents
Multistage anaerobic/anoxic/oxic activated sludge process Download PDFInfo
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Abstract
The invention relates to a multistage anaerobic/anoxic/oxic (AAO) activated sludge process, which contains the following concrete technological steps of: M stages of AAO are combined and are connected with a sedimentation basin; sewage is distributed and enters into the head end of an anaerobic tank of each stage in the system respectively according to the flow; original sewage and one part of returned sludge in the sedimentation basin are mixed and then enter into the first-stage anaerobic tank; an effluent mixed liquor is mixed with the other part of the returned sludge and then a mixed liquor flows through the first-stage anoxic tank and the first-stage oxic tank...; after the second stage, the original sewage and a mixed liquor from the end of the last-stage anoxic tank are mixed and then enter into the m-stage anoxic tank and the m-stage aerobic tank; in circulation, an effluent of the final-stage aerobic tank enters into the sedimentation basin; part of the returned sludge from the sedimentation basin returns to the head end of the first-stage anaerobic tank, and the other part returns to the head end of the first-stage anoxic tank. The invention has beneficial effects of ''one carbon source for two uses'' and realization of denitrification and phosphorus uptake at the same time.
Description
Technical field
The invention belongs to sewage disposal technology, relate in particular to a kind of multistage anaerobic/anoxic/oxic activated sludge process.
Background technology
Common Activated Sludge Process roughly has following three kinds at present:
1, anaerobic-anoxic-aerobic process (Anaerobic/Anoxic/Oxic is abbreviated as AAO) is made of three sections biological treatment devices.The difference of it and single-stage AO technique is that leading portion arranges an anaerobic reactor, be intended to make the removal of being degraded of part hardly degraded organic substance in the waste water by anaerobic process, and then improve the biodegradability of waste water, and for follow-up anoxic section provides the carbon source that is suitable for denitrification process, finally reach the efficient purpose of removing COD, BOD, N, P.The technical process of AAO system is: waste water enters anaerobic reactor after pretreatment, makes high COD material obtain decomposed in this section, then enters the anoxic section, carries out denitrification process, then is the aerobic section that carries out the oxidative degradation organism and carry out nitration reaction.For guaranteeing denitrifying efficient, an aerobic section water outlet part enters the anoxic stage by backflow, and mixes with the water outlet of anaerobism section, in order to take full advantage of the carbon source in the waste water.Another part water outlet enters second pond, and as water outlet, mud directly is back to the anaerobism section behind the isolating active mud.
This technique is with three kinds of varying environment alternate runs of anaerobic-anoxic-oxic, make polyP bacteria, nitrifier and denitrifying bacteria coexist as in the same sludge system, and the nitrate that carries in the returned sluge system has suppressed phosphate releasing under the anaerobic environment, the result causes the dephosphorization removing nitric efficiency of this technique to reduce, when especially COD/TN and COD/TP ratio are low, carbon source lacks the principal element that just becomes denitrification and dephosphorization, because polyP bacteria, the growing environment condition that nitrifier and denitrifying bacteria need is different, and this process using mostly be single sludge system, thereby can't satisfy simultaneously the optimum growh environment of three kinds of microorganisms, owing to carbon source and these two reasons of sludge system, finally cause in the AAO technique removal of nitrogen and phosphorus to become two side's contradictions of opposition.Therefore produced a large amount of AAO deformation technique technology;
2, denitrification dephosphorization denitrification technique (denitrifying phosphorus removal) refers to tame out Denitrifying Phosphate Accumulating Organisms under the condition of anaerobic-anoxic (Anaerobic/Anoxic) alternate run, and they are with nitrate NO
3 -As electron acceptor(EA), utilize internal carbon source (PHB) as electron donor, the mode by " carbon is dual-purpose " realizes denitrification denitrogenation and inhales the phosphorus effect that therefore, the denitrification dephosphorization denitrification process quilt is considered as a kind of continuable novel process simultaneously;
3, anaerobic/anoxic/anoxic/oxic activated sludge (MUCT), it is a kind of AAO deformation technique of realizing denitrification dephosphorization, comprise two internal reflux in the system, one is to be back to the second anoxic pond from Aerobic Pond, and another is to be back to anaerobic pond from the first anoxic pond.The first anoxic pond mainly utilizes the organism in the water inlet to carry out anti-nitration reaction, mainly utilizes microorganism internal storage thing to carry out the denitrifying phosphorus uptake reaction for carbon source in the second anoxic pond afterwards.This technique has the carbon source of saving, denitrogenation dephosphorizing efficient advantages of higher, but owing to contain two internal reflux systems, has increased operational and administrative expenses; Multi-stage anaerobic aerobic process (Multilevel Anoxic/Oxic, be abbreviated as MAO), be based on the AAO deformation technique that traditional Prepositive denitrification technique (AO) grows up, this technique does not need to arrange the internal reflux facility usually, biological tank volume than common dephosphorization and denitrification process is little, the average sludge concentration of system is high, and nitric efficiency is high, and operational management is convenient.But this technique is take denitrogenation as main, and synchronous biological dephosphorize efficient is difficult to reach higher level.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned technology, a kind of multistage anaerobic/anoxic/oxic activated sludge process that is particularly useful for the large-and-medium size cities sewage disposal is provided, on single anaerobic/anoxic/oxic activated sludge basis, create growing environment and the operation condition of suitable polyP bacteria, nitrifier and denitrifying bacteria, environment and the operating mode of denitrification dephosphorization denitrification is provided; Take full advantage of to greatest extent carbon source, reduce excess sludge production, reduce sewage disposal running cost.
The present invention for achieving the above object, by the following technical solutions: a kind of multistage anaerobic/anoxic/oxic activated sludge process, the concrete technology step is as follows:
One, is interconnected successively by an anaerobic pond, an anoxic pond and an Aerobic Pond, it is aerobic to form the single-stage anaerobic/anoxic, consist of the multistage anaerobic/anoxic/oxic activated sludge process system by M level anaerobic/anoxic aerobic combination, system terminal is connected with settling tank, described progression M 〉=2;
Two, sewage is pressed flow Q
1, Q
2, Q
3... Q
M-1, Q
mDistribute successively to enter anaerobic pond head end at different levels in the system, the pass of the anaerobic pond discharges of sewage at different levels and total flux Q is
Wherein M is progression, and m is arbitrary number of level, M 〉=2, and m 〉=1, M 〉=m;
Three, raw waste water flow Q
1With reflux ratio in the settling tank be R
1Partial reflux mud enter first step anaerobic pond after mixing, it goes out water mixed liquid is R with another part reflux ratio again
2Returned sluge flow through first step anoxic pond and first step Aerobic Pond after mixing;
Four, raw waste water flow Q
2Mixed solution q with upper level anoxic pond end
1' enter in the anaerobic pond of the second stage after the mixing, its go out water mixed liquid again with first step Aerobic Pond water outlet q
1Flow through second stage anoxic pond and second stage Aerobic Pond after the mixing;
Five, successively circulation, raw waste water flow Q
mMixed solution q with upper level anoxic pond end
M-1' enter m level anaerobic pond, the mixed solution q of water outlet and upper level Aerobic Pond end after the mixing
M-1Remix flows through m level anoxic pond and m level Aerobic Pond, by regulating q ' at different levels
M-1/ q
M-1Ratio, realize efficient denitrification or efficient dephosphorization, work as q '
M-1/ q
M-1＞1 o'clock, enhanced biological phosphorus removal; Work as q '
M-1/ q
M-1＜1 o'clock enhanced biological nitrogen removal;
Six, the water outlet of last step Aerobic Pond enters settling tank, in settling tank, carry out solid-liquid separation after, a returned sluge part is back to first step anaerobic pond, rest part is back to first step anoxic pond.
Described Aerobic Pond at different levels is implemented low-oxygen aeration, and dissolved oxygen is 0.2-1.0mg/l, and the dissolved oxygen numerical value of Aerobic Ponds at different levels equates or classification does not wait.
The progression M of described M level anaerobic/anoxic/oxic activated sludge process 〉=2, preferred 2≤M≤5.
Described M level anaerobic/anoxic/oxic activated sludge process, water inlet total flux Q, every grade of flooding velocity Q
m, return sludge ratio R
1And R
2, anoxic pond at different levels enter the mixed solution flow q ' of next stage anaerobic pond
m, the mixed solution flow q of Aerobic Ponds at different levels
mRelation satisfy: (
0≤R wherein
1≤ 1,0≤R
2≤ 1 and 0.4≤R
1+ R
2≤ 1.0).
Beneficial effect: according to the different target of dephosphorization denitrogenation, realize the reasonable adjusting of various working, strengthening respectively multistage anaerobic/anoxic (Multilevel Anaerobic/Anoxic, be abbreviated as MAA) or when strengthening multi-stage anaerobic aerobic (MAO), finish multistage anaerobic/anoxic aerobic (MAAO) Activated Sludge Process process, further save carbon source, save zmount of oxygen consumption, reduce surplus sludge volume.Utilize Piecewise Water Distribution technology, multistage anaerobic/anoxic alternate run technology, the aerobic alternate run technology of multi-stage anaerobic and the aerobic alternate run technology of multistage anaerobic/anoxic, the mode by " carbon is dual-purpose " realizes simultaneously denitrification denitrogenation and inhales phosphorus.Denitrogenation and dephosphorization contradictory relation in traditional anaerobic-anoxic-aerobic process have been solved.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Among the figure: Q
1, Q
2, Q
3... Q
M-1, Q
mRepresent respectively successively sewage sendout at different levels;
A
1, A
2, A
3... A
M-1, A
mRepresent respectively successively anaerobic pond at different levels (district);
A '
1, A '
2, A '
3... A '
M-1, A '
mRepresent respectively successively anoxic pond at different levels (district);
O
1, O
2, O
3... A
M-1, A
mRepresent respectively successively Aerobic Pond at different levels (district);
Q '
1, q '
2, q '
3... q '
M-1Represent respectively that successively anoxic pond at different levels (district) enter the mixed solution flow of next stage anaerobic zone;
q
1, q
2, q
3... q
M-1The mixed solution flow that represents respectively successively Aerobic Ponds at different levels (district);
R
1The expression sludge reflux is to the return sludge ratio in first step anaerobic pond (district);
R
2The expression sludge reflux is to the return sludge ratio in first step anoxic pond (district).
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing and preferred embodiment.As shown in the figure, a kind of multistage anaerobic/anoxic/oxic activated sludge process (Multilevel naerobic/Anoxic/Oxic is abbreviated as MAAO), the concrete technology step is as follows:
One, is interconnected successively by an anaerobic pond, an anoxic pond and an Aerobic Pond, it is aerobic to form the single-stage anaerobic/anoxic, consist of the multistage anaerobic/anoxic/oxic activated sludge process system by M level anaerobic/anoxic aerobic combination, system terminal is connected with settling tank, described progression M 〉=2;
Two, sewage is pressed flow Q
1, Q
2, Q
3... Q
M-1, Q
mDistribute successively to enter anaerobic pond head end at different levels in the system, the pass of the anaerobic pond discharges of sewage at different levels and total flux Q is
Wherein M is progression, and m is arbitrary number of level, M 〉=2, and m 〉=1, M 〉=m;
Three, raw waste water flow Q
1With reflux ratio in the settling tank be R
1Partial reflux mud enter first step anaerobic pond after mixing, it goes out water mixed liquid is R with another part reflux ratio again
2Returned sluge flow through first step anoxic pond and first step Aerobic Pond after mixing;
Four, raw waste water flow Q
2Mixed solution q with upper level anoxic pond end
1' enter in the anaerobic pond of the second stage after the mixing, its go out water mixed liquid again with first step Aerobic Pond water outlet q
1Flow through second stage anoxic pond and second stage Aerobic Pond after the mixing;
Five, successively circulation, raw waste water flow Q
mMixed solution q with upper level anoxic pond end
M-1' enter m level anaerobic pond, the mixed solution q of water outlet and upper level Aerobic Pond end after the mixing
M-1Remix flows through m level anoxic pond and m level Aerobic Pond, by regulating q ' at different levels
M-1/ q
M-1Ratio, realize efficient denitrification or efficient dephosphorization;
Six, the water outlet of last step Aerobic Pond enters settling tank, in settling tank, carry out solid-liquid separation after, a returned sluge part is back to first step anaerobic pond, rest part is back to first step anoxic pond.
Described Aerobic Pond at different levels is implemented low-oxygen aeration, and dissolved oxygen is 0.2-1.0mg/l, and the dissolved oxygen numerical value of Aerobic Ponds at different levels equates or classification does not wait.
Anaerobic pond (district) A that flooding velocity Q divides the m section to enter AA ' O at different levels
mHead end, every section flow is Q
mTotal flux Q and every section are allocated flow Q into
mThe pass be
M in the formula 〉=2, m 〉=1, M 〉=m.
Aforesaid a kind of multistage anaerobic/anoxic/oxic activated sludge process (MAAO) second pond returned sluge divides two portions, and wherein a part is with reflux ratio R
1, quantity of reflux R
1The returned sluge of Q enters first step anaerobic pond A
1Head end; Another part is with reflux ratio R
2, quantity of reflux R
2The returned sluge of Q enters first step anoxic pond A '
1Head end.
The flow process relation of adjacent two-stage AA ' O is as follows: raw water flow Q
mWith m-1 level anoxic pond A '
M-1Water flow q '
M-1At m level anaerobic pond A
mHead end mixes, anaerobic pond A at the corresponding levels
mIn, raw water flow Q is allocated in the polyP bacteria utilization in the active sludge into
mIn carbon source finish anaerobic phosphorus release, anaerobic pond A at the corresponding levels
mGoing out the water mixed liquid flow is Q
M+q'
M-1With previous stage be m-1 level Aerobic Pond O
M-1In, flow is q
M-1The water mixed liquid that goes out mix, enter anoxic pond A ' at the corresponding levels
m, denitrifying bacteria and Denitrifying Phosphate Accumulating Organisms continue to occur denitrification denitrogenation and denitrification phosphorus-collecting reaction.Anoxic pond A ' at the corresponding levels
mMiddle flow is Q
m+ q '
M-1+ q
M-1Go out a part of flow q ' in the water mixed liquid
mEnter next stage m+1 level anaerobic pond A
M+1Head end continues to repeat said process; Another part flow q
mEnter Aerobic Pond O at the corresponding levels
m, under the effect of nitrifier and polyP bacteria, finish the nitration reaction of nitrogen element and the excess of phosphoric and inhale phosphorus reaction; Aerobic Pond O at the corresponding levels
mBe q at middle flow
mThe water mixed liquid that goes out enter next stage m+1 level anoxic pond A '
M+1Head end continues to repeat said process.Adjacent two-stage discharge relation is as mentioned above:
0≤R in the formula
1≤ 1,0≤R
2≤ 1 and 0.4≤R
1+ R
2≤ 1.0.
Can be according to the water quality situation, as q ' in the process operation process
M-1/ q
M-1, select multistage anaerobic/anoxic (MAA) to realize reinforced phosphor-removing at＞1 o'clock; Or as q '
M-1/ q
M-1＜1 o'clock, multi-stage anaerobic aerobic (MAO) was realized strengthened denitrification.
For further reducing production energy consumption, Aerobic Ponds at different levels can be implemented low-oxygen aeration, and dissolved oxygen is between the 0.2-1.0mg/l, and the dissolved oxygen numerical value of Aerobic Ponds at different levels equates or classification does not wait.Implement the low-oxygen aeration state by control, be conducive to realize synchronous nitration and denitrification and short-cut nitrification and denitrification, further improve biological denitrificaion efficient, further save the consumption of required carbon source and oxygen, reduce excess sludge production, especially be fit to the city domestic sewage of low ratio of carbon to ammonium.
Principle of work:
The sewage segmentation enters the multistage anaerobic/anoxic/oxic activated sludge process system, carbon source in the sewage is fully used, preferential polyP bacteria and the denitrifying bacteria supplied with, improved simultaneously the sludge concentration of biological treatment system, in the sewage disposal flow process, form different sludge concentration gradients, save the biological tank volume; Enter the mixed solution q ' of rear one-level anaerobic pond by changing the previous stage anoxic pond
M-1Enter the mixed solution q of rear one-level anoxic pond with the previous stage Aerobic Pond
M-1Between ratio, can realize respectively strengthening multistage anaerobic/anoxic (MAA) or strengthen the processing method of multi-stage anaerobic aerobic (MAO), reach the efficient dephosphorization of " carbon is dual-purpose " or the target of denitrogenation;
Work as q '
M-1/ q
M-1Greater than 1 o'clock; Sewage treatment systems is in the aerobic process of multistage anaerobic/anoxic, it is the alternate run envrionment conditions of main flow that multistage anaerobic/anoxic is provided simultaneously, impels and carries out denitrification dephosphorization, realizes synchronously denitrogenation and dephosphorization in the mode of " carbon is dual-purpose ", thereby the saving carbon source, the reinforced phosphor-removing process;
Work as q '
M-1/ q
M-1Less than 1 o'clock; Sewage treatment systems provides simultaneously that multi-stage anaerobic is aerobic to be the alternate run envrionment conditions of main flow in the aerobic process of multistage anaerobic/anoxic, can fully carry out denitrification, realizes efficient denitrification, the strengthened denitrification process;
Denitrification dephosphorization is to replace oxygen in the suction phosphorus stage take nitrate to take the photograph phosphorus as electron acceptor(EA) carries out anoxic, and nitrate is reduced to nitrogen and is removed simultaneously, has reached the simultaneously effect of denitrogenation dephosphorizing.Carbon source in the Denitrifying Phosphorus Removal Technology has been brought into play the function of " carbon is dual-purpose ", has both synthesized PHA, also for denitrification denitrogenation provides electron donor, has saved simultaneously aeration rate.Compare with aerobic dephosphorization, Denitrifying Phosphorus Removal Technology can be saved carbon source 50%, and sludge yield reduces 50%, and overall aeration rate can reduce about 30%.Denitrification dephosphorization has been alleviated denitrification and has been released phosphorus to contradictions such as the required best SRT of the contradiction of carbon source demand and nitrifier and polyP bacteria are inconsistent, a kind of Biological Nitrogen Removal Processe of novel high-efficiency low energy consumption.
Embodiment one
Realize strengthened denitrification
Multistage anaerobic/anoxic/oxic activated sludge process of the present invention (MAAO), aerobic (AA ' O) forms by the level Four anaerobic/anoxic, and every grade of AA ' O is interconnected successively by an anaerobic pond A, an anoxic pond A ' and an Aerobic Pond O; Sewage is by waiting flow Q
1=Q
2=Q
3=Q
4=25%Q distributes successively and enters anaerobic pond head end at different levels, and total return sludge ratio is 100%, wherein part return sludge ratio R
1=70% is back to first step anaerobic pond (A
1), all the other return sludge ratio R
2=30% is back to first step anoxic pond A '
1The mixed solution total amount of anoxic pond at different levels is respectively 1.25Q, 1.5Q, 1.75Q, 2.0Q.First three grade anoxic pond mixed solution, a part of q
1=Q, q
2=1.25Q, q
3=1.25Q enters subordinate's anoxic pond and carries out denitrification after finishing nitration reaction through Aerobic Pond at the corresponding levels; Another part q '
1=0.25Q, q '
2=0.25Q, q '
3=0.25Q directly enters subordinate's anaerobic pond, ensures synchronous biological dephosphorize.The mixed solution 2.0Q of fourth stage anoxic pond all enters fourth stage Aerobic Pond, and the rear water outlet of reaction enters settling tank and carries out mud-water separation.Aerobic Pond dissolved oxygens at different levels are controlled between the 1.5-2.5mg/l.
Embodiment two
Realize intensified anti-nitrated phosphorous-removal
Multistage anaerobic/anoxic/oxic activated sludge process of the present invention (MAAO), aerobic (AA ' O) forms by the level Four anaerobic/anoxic, and every grade of AA ' O is interconnected successively by an anaerobic pond A, an anoxic pond A ' and an Aerobic Pond O; Sewage is by waiting flow Q
1=Q
2=Q
3=Q
4=25%Q distributes successively and enters anaerobic pond head end at different levels, and total return sludge ratio is 100%, and wherein the part return sludge ratio is R
1=70% is back to first step anaerobic pond A
1, all the other return sludge ratios are R
2=30% is back to first step anoxic pond A '
1The mixed solution total amount of anoxic pond at different levels is respectively 1.25Q, 1.5Q, 1.75Q, 2.0Q.First three grade anoxic pond mixed solution, a part of q '
1=Q, q '
2=1.25Q, q '
3=1.5Q directly enters subordinate's anaerobic pond, carries out intensified anti-nitrated phosphorous-removal; Another part q
1=0.25Q, q
2=0.25Q, q
3=0.25Q enters subordinate's anoxic pond and carries out denitrification after finishing nitration reaction through Aerobic Pond at the corresponding levels, ensures simultaneous denitrification.After the mixed solution 2.0Q of fourth stage anoxic pond all entered the reaction of fourth stage Aerobic Pond, water outlet entered settling tank and carries out mud-water separation.Aerobic Pond dissolved oxygens at different levels are controlled between the 1.5-2.5mg/l.
Embodiment three
The low-oxygen aeration energy-saving run
Above-mentioned two kinds of embodiments are implemented under same operating mode, and Aerobic Ponds at different levels are implemented low-oxygen aeration, and dissolved oxygen is between the 0.2-1.0mg/l, further saves aeration energy consumption, reduce working cost.
The above only is preferred embodiment of the present invention, is not structure of the present invention is done any pro forma restriction.Every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment does.
Claims (4)
1. multistage anaerobic/anoxic/oxic activated sludge process, the concrete technology step is as follows:
One, is interconnected successively by an anaerobic pond, an anoxic pond and an Aerobic Pond, it is aerobic to form the single-stage anaerobic/anoxic, consist of the multistage anaerobic/anoxic/oxic activated sludge process system by M level anaerobic/anoxic aerobic combination, system terminal is connected with settling tank, described progression M 〉=2;
Two, sewage is pressed flow Q
1, Q
2, Q
3Q
M-1, Q
mDistribute successively to enter anaerobic pond head end at different levels in the system, the pass of the anaerobic pond discharges of sewage at different levels and total flux Q is
Wherein M is progression, and m is arbitrary number of level, M 〉=2, m 〉=1, M 〉=m;
Three, raw waste water flow Q
1With reflux ratio in the settling tank be R
1Partial reflux mud enter first step anaerobic pond after mixing, it goes out water mixed liquid is R with another part reflux ratio again
2Returned sluge flow through first step anoxic pond and first step Aerobic Pond after mixing;
Four, raw waste water flow Q
2Mixed solution q with upper level anoxic pond end
1' enter in the anaerobic pond of the second stage after the mixing, its go out water mixed liquid again with first step Aerobic Pond water outlet q
1Flow through second stage anoxic pond and second stage Aerobic Pond after the mixing;
Five, successively circulation, raw waste water flow Q
mMixed solution q with upper level anoxic pond end
M-1' enter m level anaerobic pond, the mixed solution q of water outlet and upper level Aerobic Pond end after the mixing
M-1Remix flows through m level anoxic pond and m level Aerobic Pond, by regulating q ' at different levels
M-1/ q
M-1Ratio, realize efficient denitrification or efficient dephosphorization, work as q '
M-1/ q
M-1＞1 o'clock, enhanced biological phosphorus removal; Work as q '
M-1/ q
M-1＜1 o'clock enhanced biological nitrogen removal;
Six, the water outlet of last step Aerobic Pond enters settling tank, in settling tank, carry out solid-liquid separation after, a returned sluge part is back to first step anaerobic pond, rest part is back to first step anoxic pond.
2. multistage anaerobic/anoxic/oxic activated sludge process according to claim 1 is characterized in that: described Aerobic Ponds at different levels are implemented low-oxygen aerations, and dissolved oxygen is 0.2-1.0mg/l, and the dissolved oxygen numerical value of Aerobic Ponds at different levels equates or classification does not wait.
3. multistage anaerobic/anoxic/oxic activated sludge process according to claim 1 is characterized in that: the progression M of described multistage anaerobic/anoxic/oxic activated sludge process 〉=2 or 2≤M≤5.
4. multistage anaerobic/anoxic/oxic activated sludge process according to claim 1 is characterized in that: described multistage anaerobic/anoxic/oxic activated sludge process, water inlet total flux Q, every grade of flooding velocity Q
m, return sludge ratio R
1And R
2, anoxic pond at different levels enter the mixed solution flow q ' of next stage anaerobic pond
m, the mixed solution flow q of Aerobic Ponds at different levels
mRelation satisfy:
0≤R wherein
1≤ 1,0≤R
2≤ 1 and 0.4≤R
1+ R
2≤ 1.0.
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| CN103332788B (en) * | 2013-07-19 | 2015-04-08 | 环境保护部南京环境科学研究所 | Multi-stage anaerobic-aerobic combined nitrogen and phosphorus removing device and method for rural domestic sewage |
| CN105060489A (en) * | 2015-09-10 | 2015-11-18 | 天津泰达新水源科技开发有限公司 | A2O (Anaerobic-Anoxic-Oxic) system of denitrification and dephosphorization for sewage treatment |
| CN105948259A (en) * | 2016-07-18 | 2016-09-21 | 符惠 | Combined sewage purification treatment process and use method |
| CN105923934A (en) * | 2016-07-18 | 2016-09-07 | 符惠 | Combined sewage treatment system convenient to operate, and use method thereof |
| CN107746108A (en) * | 2017-11-23 | 2018-03-02 | 天津市华博水务有限公司 | A kind of oxidation ditch biological treatment system and method |
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| CN110745948A (en) * | 2019-09-27 | 2020-02-04 | 中车环境科技有限公司 | Sectional water inlet deep dephosphorization and denitrification process |
| CN111977797B (en) * | 2020-08-25 | 2022-11-22 | 中生源(海南)生态环境发展有限公司 | Wastewater treatment system and process for synchronous denitrification and dephosphorization of AxOx |
| CN112374696A (en) * | 2020-11-09 | 2021-02-19 | 河北先河正合环境科技有限公司 | System and method for treating sewage by multistage multi-point water inflow enhanced denitrification |
| CN113480096A (en) * | 2021-07-13 | 2021-10-08 | 西安建筑科技大学 | Sewage treatment system and process for step-by-step backflow and double circulation of biological activated sludge |
| CN113620426B (en) * | 2021-08-06 | 2023-11-03 | 北京市环境保护科学研究院 | Multistage anoxic-aerobic sewage treatment equipment and method |
| CN117003390A (en) * | 2023-08-09 | 2023-11-07 | 中铁建发展集团有限公司 | Three-reflux multistage A/O device and method for strengthening endogenous synchronous denitrification and dephosphorization sludge |
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|---|---|---|---|---|
| US7736513B2 (en) * | 2000-10-02 | 2010-06-15 | The University Of Western Ontario | Liquid-solid fluidized bed waste water treatment system for simultaneous carbon, nitrogen and phosphorous removal |
| CN201485361U (en) * | 2009-08-19 | 2010-05-26 | 中国市政工程西北设计研究院有限公司 | Dephosphorizing and denitrifying granular sludge bioreactor |
| CN201485360U (en) * | 2009-08-19 | 2010-05-26 | 中国市政工程西北设计研究院有限公司 | Multi-section and multistage AO dephosphorization and denitrification reaction system |
| CN101885559A (en) * | 2010-06-25 | 2010-11-17 | 可事托环保设备（上海）有限公司 | Multi-level biological nitrogen and phosphorus removal sewage treatment method and device |
| CN201971701U (en) * | 2010-12-28 | 2011-09-14 | 中国市政工程西北设计研究院有限公司 | Multi-section and multi-stage AO biological reaction tank |
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2012
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