CN102491604A - 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 anaerobism anoxic aerobic activated sludge process technology.
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 to be made up of three sections biological treatment devices.The difference of it and single-stage AO technology is that leading portion is provided with an anaerobic reactor; Be intended to make the part hardly degraded organic substance in the waste water be able to the degraded removal through Anaerobic processes; And then improve the biodegradability of waste water; And the carbon source that is suitable for denitrification process is provided for follow-up anoxic section, finally reach the purpose of efficient removal COD, BOD, N, P.The technical process of AAO system is: waste water gets into anaerobic reactor after pre-treatment, makes high COD material obtain part in this section and decomposes, and gets into the anoxic section then, carries out denitrification process, then is to carry out the oxidative degradation organism and the aerobic section that carries out nitration reaction.For guaranteeing denitrifying efficient, an aerobic section water outlet part gets into the anoxic stage through refluxing, and mixes with the water outlet of anaerobism section, so that make full use of the carbon source in the waste water.Another part water outlet gets into second pond, and as water outlet, mud directly is back to the anaerobism section behind the isolating active mud.
This technology is with anaerobic-anoxic-aerobic three kinds of varying environment alternate runs; PolyP bacteria, nitrifier and denitrifying bacteria are coexisted as in the same sludge system; And the nitrate salt that carries in the returned sluge system has suppressed the release of phosphorus under the anaerobic environment, and the result causes the dephosphorization removing nitric efficiency of this technology 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 the growing environment condition that polyP bacteria, nitrifier and denitrifying bacteria need has nothing in common with each other, and this process using be mostly single sludge system, thereby can't satisfy the optimum growh environment of three kinds of mikrobes simultaneously; Owing to carbon source and these two reasons of sludge system, finally cause in the AAO technology 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 technology (denitrifying phosphorus removal) is meant that under the condition of anaerobic-anoxic (Anaerobic/Anoxic) alternate run tame out the denitrification phosphorus-collecting bacterium, they are with nitrate salt NO
3 -As electron acceptor(EA), utilize internal carbon source (PHB) as electron donor, the mode through " carbon is dual-purpose " realizes denitrification denitrogenation and inhales the phosphorus effect that therefore, the denitrification dephosphorization denitrification process quilt is regarded as a kind of continuable novel process simultaneously;
3, anaerobism anoxic/anoxic aerobic activated sludge process (MUCT) is a kind of AAO deformation technique of realizing denitrification dephosphorization, comprises two internal reflux in the system, and one is to be back to second anoxic pond from Aerobic Pond, and another is to be back to anaerobic pond from first anoxic pond.First anoxic pond mainly utilizes the organism in the water inlet to carry out anti-nitration reaction, mainly utilizes mikrobe internal storage thing to carry out the denitrifying phosphorus uptake reaction for carbon source in second anoxic pond afterwards.This technology 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 technology (AO) grows up, this technology need not be provided with 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 technology is main with denitrogenation, and synchronous biological dephosphorize efficient is difficult to reach higher level.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned technology; A kind of multistage anaerobism anoxic aerobic activated sludge process technology that is particularly useful for the large-and-medium size cities WWT is provided; On single anaerobism anoxic aerobic activated sludge process basis; Create the growing environment and the operation condition of suitable polyP bacteria, nitrifier and denitrifying bacteria, the environment and the operating mode of denitrification dephosphorization denitrification is provided; Make full use of carbon source to greatest extent, reduce excess sludge production, reduce WWT running cost.
The present invention adopts following technical scheme for realizing above-mentioned purpose: a kind of multistage anaerobism anoxic aerobic activated sludge process technology, and concrete process step is following:
One, is interconnected successively by an anaerobic pond, an anoxic pond and an Aerobic Pond; It is aerobic to form single-stage anaerobism anoxic; Constitute multistage anaerobism anoxic aerobic activated sludge process process system by M level anaerobism anoxic is aerobic, system terminal is connected with settling tank, said progression M >=2;
Two, sewage is pressed flow Q
1, Q
2, Q
3... Q
M-1, Q
mDistribute anaerobic pond head end at different levels in the entering system successively, the relation of the anaerobic pond discharges of sewage at different levels and total flux Q does
Wherein M is a progression, and m is an 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 mix the back and get into first step anaerobic pond, 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
2With the terminal mixed solution q of upper level anoxic pond
1' mix the back and get in the anaerobic pond of the second stage, 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, circulation successively, raw waste water flow Q
mWith the terminal mixed solution q of upper level anoxic pond
M-1' mixing back entering m level anaerobic pond, the mixed solution q that water outlet and upper level Aerobic Pond are terminal
M-1Remix flows through m level anoxic pond and m level Aerobic Pond, through 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-1Enhanced biological denitrogenation in＜1 o'clock;
Six, the water outlet of last step Aerobic Pond gets into 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.
Said 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.
Progression M>=2 of said M level anaerobism anoxic aerobic activated sludge process technology, preferred 2≤M≤5.
Said M level anaerobism anoxic aerobic activated sludge process technology, water inlet total flux Q, every grade of flooding velocity Q
m, return sludge ratio R
1And R
2, anoxic pond at different levels get into 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, when strengthening multistage anaerobism anoxic (Multilevel Anaerobic/Anoxic is abbreviated as MAA) respectively or strengthening multi-stage anaerobic aerobic (MAO); Accomplish multistage anaerobism anoxic aerobic (MAAO) Activated Sludge Process process; Further save carbon source, save zmount of oxygen consumption, reduce surplus sludge volume.Utilize segmentation water distribution technology, multistage anaerobism anoxic alternate run technology, the aerobic alternate run technology of multi-stage anaerobic and the aerobic alternate run technology of multistage anaerobism anoxic, the mode through " carbon is dual-purpose " realizes denitrification denitrogenation simultaneously and inhales phosphorus.Denitrogenation and dephosphorization contradictory relation in traditional anaerobic-anoxic-aerobic process have been solved.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Among the figure: Q
1, Q
2, Q
3... Q
M-1, Q
mRepresent sewage sendout at different levels successively respectively;
A
1, A
2, A
3... A
M-1, A
mRepresent anaerobic pond at different levels (district) successively respectively;
A '
1, A '
2, A '
3... A '
M-1, A '
mRepresent anoxic pond at different levels (district) successively respectively;
O
1, O
2, O
3... A
M-1, A
mRepresent Aerobic Pond at different levels (district) successively respectively;
Q '
1, q '
2, q '
3... q '
M-1Represent respectively that successively anoxic pond at different levels (district) get into the mixed solution flow of next stage anaerobic zone;
q
1, q
2, q
3... q
M-1The mixed solution flow of representing Aerobic Ponds at different levels (district) successively respectively;
R
1Expression mud is back to the return sludge ratio in first step anaerobic pond (district);
R
2Expression mud is back to the return sludge ratio in first step anoxic pond (district).
Embodiment
Specify embodiment of the present invention below in conjunction with accompanying drawing and preferred embodiment.As shown in the figure, a kind of multistage anaerobism anoxic aerobic activated sludge process technology (Multilevel naerobic/Anoxic/Oxic is abbreviated as MAAO), concrete process step is following:
One, is interconnected successively by an anaerobic pond, an anoxic pond and an Aerobic Pond; It is aerobic to form single-stage anaerobism anoxic; Constitute multistage anaerobism anoxic aerobic activated sludge process process system by M level anaerobism anoxic is aerobic, system terminal is connected with settling tank, said progression M >=2;
Two, sewage is pressed flow Q
1, Q
2, Q
3... Q
M-1, Q
mDistribute anaerobic pond head end at different levels in the entering system successively, the relation of the anaerobic pond discharges of sewage at different levels and total flux Q does
Wherein M is a progression, and m is an 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 mix the back and get into first step anaerobic pond, 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
2With the terminal mixed solution q of upper level anoxic pond
1' mix the back and get in the anaerobic pond of the second stage, 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, circulation successively, raw waste water flow Q
mWith the terminal mixed solution q of upper level anoxic pond
M-1' mixing back entering m level anaerobic pond, the mixed solution q that water outlet and upper level Aerobic Pond are terminal
M-1Remix flows through m level anoxic pond and m level Aerobic Pond, through 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 gets into 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.
Said 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 get into AA ' O at different levels
mHead end, every section flow is Q
mTotal flux Q and every section are allocated flow Q into
mRelation do
M in the formula>=2, m>=1, M>=m.
Aforesaid a kind of multistage anaerobism anoxic aerobic activated sludge process technology (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 gets into first step anaerobic pond A
1Head end; Another part is with reflux ratio R
2, quantity of reflux R
2The returned sluge of Q gets into first step anoxic pond A '
1Head end.
The flow process of adjacent two-stage AA ' O concerns 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 accomplish 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, get into anoxic pond A ' at the corresponding levels
m, denitrifying bacteria and denitrification phosphorus-collecting bacterium continue to take place 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
mGet into next stage m+1 level anaerobic pond A
M+1Head end continues the repetition said process; Another part flow q
mGet into Aerobic Pond O at the corresponding levels
m, under the effect of nitrifier and polyP bacteria, accomplish the nitration reaction of nitrogen element and the excess of phosphoric and inhale phosphorus reaction; Aerobic Pond O at the corresponding levels
mAt middle flow is q
mThe water mixed liquid that goes out get into next stage m+1 level anoxic pond A '
M+1Head end continues the repetition said process.Adjacent as stated two-stage discharge relation is:
0≤R in the formula
1≤1,0≤R
2≤1 and 0.4≤R
1+ R
2≤1.0.
Can be in the technology operational process according to the water quality situation, as q '
M-1/ q
M-1, select multistage anaerobism 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 through control; Help realizing 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 gets into multistage anaerobism anoxic aerobic activated sludge process process system; Carbon source in the sewage is fully used; Preferential polyP bacteria and the denitrifying bacteria supplied with; Improve the sludge concentration of biological treatment system simultaneously, in the WWT flow process, formed different sludge concentration gradients, saved the biological tank volume; Through changing the mixed solution q ' that the previous stage anoxic pond gets into back one-level anaerobic pond
M-1Get into the mixed solution q of back one-level anoxic pond with the previous stage Aerobic Pond
M-1Between ratio, can realize strengthening multistage anaerobism anoxic (MAA) respectively or strengthen the process 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 anaerobism anoxic; The alternate run envrionment conditions that multistage anaerobism anoxic is provided simultaneously is main flow is impelled and is carried out denitrification dephosphorization, realizes denitrogenation and dephosphorization synchronously with 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 anaerobism anoxic, can fully carry out denitrification, realizes efficient denitrification, the strengthened denitrification process;
Denitrification dephosphorization is that to replace oxygen with nitrate salt be that electron acceptor(EA) carries out anoxic and takes the photograph phosphorus inhaling the phosphorus stage, and nitrate salt is reduced to nitrogen and is able to and removes simultaneously, has reached the effect of denitrogenation dephosphorizing simultaneously.Carbon source in the denitrification dephosphorization 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 practiced thrift aeration rate simultaneously.Compare with aerobic dephosphorization, the denitrification dephosphorization technology can be practiced thrift 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, and a kind of biological carbon and phosphorous removal of novel high-efficiency low energy consumption is technological.
Embodiment one
Realize strengthened denitrification
Multistage anaerobism anoxic aerobic activated sludge process technology of the present invention (MAAO), aerobic (AA ' O) forms by level Four anaerobism anoxic, and every grade of AA ' O is interconnected by an anaerobic pond A, an anoxic pond A ' and an Aerobic Pond O successively; Sewage is by waiting flow Q
1=Q
2=Q
3=Q
4=25%Q distributes entering anaerobic pond head end at different levels successively, 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 gets into subordinate's anoxic pond and carries out denitrification after accomplishing nitration reaction through Aerobic Pond at the corresponding levels; Another part q '
1=0.25Q, q '
2=0.25Q, q '
3=0.25Q directly gets into subordinate's anaerobic pond, ensures synchronous biological dephosphorize.The mixed solution 2.0Q of fourth stage anoxic pond all gets into fourth stage Aerobic Pond, and reaction back water outlet gets into 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 anaerobism anoxic aerobic activated sludge process technology of the present invention (MAAO), aerobic (AA ' O) forms by level Four anaerobism anoxic, and every grade of AA ' O is interconnected by an anaerobic pond A, an anoxic pond A ' and an Aerobic Pond O successively; Sewage is by waiting flow Q
1=Q
2=Q
3=Q
4=25%Q distributes entering anaerobic pond head end at different levels successively, 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 gets into 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 gets into subordinate's anoxic pond and carries out denitrification after accomplishing nitration reaction through Aerobic Pond at the corresponding levels, ensures simultaneous denitrification.After the mixed solution 2.0Q of fourth stage anoxic pond all got into the reaction of fourth stage Aerobic Pond, water outlet got into 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 did.
Claims (4)
1. multistage anaerobism anoxic aerobic activated sludge process technology, concrete process step is following:
One, is interconnected successively by an anaerobic pond, an anoxic pond and an Aerobic Pond; It is aerobic to form single-stage anaerobism anoxic; Constitute multistage anaerobism anoxic aerobic activated sludge process process system by M level anaerobism anoxic is aerobic, system terminal is connected with settling tank, said progression M >=2;
Two, sewage is pressed flow Q
1, Q
2, Q
3... Q
M-1, Q
mDistribute anaerobic pond head end at different levels in the entering system successively, the relation of the anaerobic pond discharges of sewage at different levels and total flux Q does
Wherein M is a progression, and m is an 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 mix the back and get into first step anaerobic pond, 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
2With the terminal mixed solution q of upper level anoxic pond
1' mix the back and get in the anaerobic pond of the second stage, 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, circulation successively, raw waste water flow Q
mWith the terminal mixed solution q of upper level anoxic pond
M-1' mixing back entering m level anaerobic pond, the mixed solution q that water outlet and upper level Aerobic Pond are terminal
M-1Remix flows through m level anoxic pond and m level Aerobic Pond, through 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-1Enhanced biological denitrogenation in＜1 o'clock;
Six, the water outlet of last step Aerobic Pond gets into 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 anaerobism anoxic aerobic activated sludge process technology according to claim 1 is characterized in that: said Aerobic Ponds at different levels are 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.
3. multistage anaerobism anoxic aerobic activated sludge process technology according to claim 1 is characterized in that: progression M>=2 of said M level anaerobism anoxic aerobic activated sludge process technology, preferred 2≤M≤5.
4. multistage anaerobism anoxic aerobic activated sludge process technology according to claim 1 is characterized in that: said M level anaerobism anoxic aerobic activated sludge process technology, water inlet total flux Q, every grade of flooding velocity Q
m, return sludge ratio R
1And R
2, anoxic pond at different levels get into 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≤
R2≤1 and 0.4≤R
1+ R
2≤1.0.
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| CN103332788A (en) * | 2013-07-19 | 2013-10-02 | 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 |
| CN105923934A (en) * | 2016-07-18 | 2016-09-07 | 符惠 | Combined sewage treatment system convenient to operate, and use method thereof |
| CN105948259A (en) * | 2016-07-18 | 2016-09-21 | 符惠 | Combined sewage purification treatment process and use method |
| 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 |
| CN110467264A (en) * | 2019-09-02 | 2019-11-19 | 安徽舜禹水务股份有限公司 | A kind of reinforcing air lift denitrogenation circulating sewage processing equipment |
| 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 |
| CN111977797A (en) * | 2020-08-25 | 2020-11-24 | 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 |
| CN113620426A (en) * | 2021-08-06 | 2021-11-09 | 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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| 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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