CN100349810C - AZNdenitrification phosphorus oliminating sewage treatment method and device - Google Patents
AZNdenitrification phosphorus oliminating sewage treatment method and device Download PDFInfo
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Abstract
The present invention relates to an A2N denitrifying phosphorus removal method and device for treating sewage. Raw water is pumped from a water tank to an anaerobic basin, and muddy water discharged from the anaerobic basin enters a middle settling basin; supernatant liquid discharged from the middle settling basin flows into an aerobic biological film nitrifying basin to carry out nitration reaction; meanwhile, transcendental sludge settled in the settling basin is directly pumped into an oxygen-deficient basin, and the quantity of the transcendental sludge is controlled within the range of 10 to 33% of the water inflow quantity; treating water discharged from the aerobic biological film nitrifying basin enters the oxygen-deficient basin; treating water discharged from the oxygen-deficient basin enters a quick aeration basin for absorbing excess phosphorus; treating water discharged from the quick aeration basin enters a final settling basin; the supernatant liquid is discharged from a water outlet pipe; excess sludge is discharged from a sludge pipe; partial sludge is divided to a sludge return pipe and pumped into the anaerobic basin; the flow quantity of return sludge is controlled to account for 10 to 40% of the water inflow quantity. The present invention solves the problem of difficult control of the concentrations of ammonia nitrogen, TN and TP in discharged water, ensures that the quality of the discharged water comes up to a standard, and saves the energy consumption.
Description
(1), technical field
This invention relates to a kind of sewage water treatment method and device thereof.
(2), background technology
The body eutrophication that nitrogen, phosphorus excessive emissions cause is one of environmental problem of paying close attention to the most as former government and the public, and the nitrogen, the phosphorus that turn to purpose with the control water eutrophication remove and becomes the main objective of the struggle of various countries' sewage disposal.The nearly all sewage work of China all is faced with same problem at present, be that denitrogenation and dephosphorization removal effect can not reach optimum regime simultaneously, trace it to its cause and be mainly: 1, COD of sewage/TN ratio is lower, and carbon source lacks the restrictive factor that becomes denitrification and dephosphorization; 2, the envrionment conditions of this three quasi-microorganisms physiological habit of nitrifier, denitrifying bacteria and polyP bacteria and requirement has nothing in common with each other, mostly be single sludge system but Sewage Plant adopts, microorganism is the suspension mixed growth, thereby can't guarantee that they can grow in best separately environment simultaneously.These two reasons have finally caused the removal of nitrogen and phosphorus to become two aspects of opposition contradiction, make water outlet ammonia nitrogen, TN and TP concentration be difficult to control and remove not thorough, nitrogenous, phosphorus eutrophication sewage treating efficiency is lower, the treatment time is long, energy consumption is higher, and the sewage denitrification and dephosphorization effect is unstable and compliance rate is lower.
(3), summary of the invention
Purpose of the present invention will provide a kind of A
2N denitrifying and dephosphorizing sewage treatment process and device thereof, (A
2N is the current techique term, is the abbreviation of Anaerobic/Anoxic and nitrifying), solve technical problem nitrogenous, the sewage disposal of phosphorus eutrophication; And the unstable and lower problem of compliance rate of solution sewage denitrification and dephosphorization effect.
Technical scheme of the present invention: this A
2The N denitrifying and dephosphorizing sewage treatment process has following steps:
(1), pump is to anaerobic pond from water tank for former water, under stirring, the denitrification phosphorus-collecting bacterium absorbs a large amount of organism at this, and stores in vivo with the form of PHB, discharges a large amount of phosphorus simultaneously;
(2), the muddy water of discharging in the above-mentioned anaerobic pond enters medium sediment pool, through the medium sediment pool sharp separation;
(3), the above-mentioned medium sediment pool supernatant liquor that is rich in ammonia nitrogen and phosphorus of discharging, flow to the aerobic biologic membrane nitrification tank, carry out nitration reaction, simultaneously the also aerobic remaining organism of having degraded; It is characterized in that:
(4), simultaneously, the poly-phosphorus sludge that above-mentioned medium sediment pool precipitates claims to surmount mud, is directly pumped into anoxic pond, and DPB is an electron donor with intravital PHB, the NO that provides with nitrification tank
3 -As electron acceptor(EA), finish denitrification denitrogenation and the effect of excessive suction phosphorus, when handling sanitary sewage, will surmount in 10～33% scopes that sludge quantity is controlled at flooding velocity;
(5), the above-mentioned aerobic biologic membrane nitrification tank processed water of discharging enters anoxic pond, carries out hypoxia response under stirring;
(6), the processed water of discharging from anoxic pond enters quick aeration tank, is absorbed remaining phosphorus;
(7), the processed water of discharging from quick aeration tank enters final deposition pool, supernatant liquor is discharged from rising pipe, excess sludge is discharged from sludge pipe, part mud branches to mud return line, and be pumped to anaerobic pond, when handling sanitary sewage, with the returned sluge flow control at 10～40% of flooding velocity.
This A
2N denitrification dephosphorization waste disposal plant is characterized in that:
Contact in proper order by raw water tubes, water tank, pump, anaerobic pond, medium sediment pool, aerobic biologic membrane nitrification tank, anoxic pond, quick aeration tank, final deposition pool, rising pipe;
Anaerobic pond and anoxic pond are built-in with whipping appts;
Be connected with between medium sediment pool bottom and the anoxic pond bottom and surmount sludge pipe;
Between final deposition pool bottom and anaerobic pond bottom, be communicated with reflux sludge tube.
Beneficial effect of the present invention:
Experiment effect one: the real life sewage with certain university's dependents' district discharging is former water, the COD of water inlet, ammonia nitrogen and total phosphorus value (COD=201-332mg/L, NH
4 +-N=44.74～68.89, TP=4.95-9.66mg/L).The SRT of poly-phosphorus sludge is 12～14d (not considering the biomembranous SRT of nitrification tank).The DO concentration set point of microbial film nitrification tank is 2～3mg/L, and the DO concentration of back aeration tank is set in about 2mg/L.Flooding velocity is 43.2-48L/d, will surmount mud discharge and be controlled at about 50% of flooding velocity, is the harmony of each reactor mud in the maintenance system, and the returned sluge flow also is controlled at about 50% of flooding velocity.Operation result as shown in Figure 2, from last group data (arrow is represented Fig. 2) as can be seen, when influent ammonium concentration is 52mg/L, the nitrification tank ammonia nitrogen concentration is 3.5mg/L, the ammonia nitrogen concentration of last water outlet is also up to about 10mg/L.Here it is because because higher when surmounting the mud ratio and being controlled at 50% left and right sides, equates that a part of ammonia nitrogen just directly enters anoxic pond without aerobic nitrification, causes the water outlet ammonia nitrogen concentration higher.Therefore being necessary has under the prerequisite of capacity mud in guaranteeing anoxic pond, reduces to surmount mud discharge as far as possible, reduces the ammonia nitrogen concentration of water outlet with this.
Experiment effect two: the real life sewage with certain university's dependents' district discharging is former water, adds an amount of tap water dilution or adds glucose, NH4Cl, KH
2PO
4Reach different COD, ammonia nitrogen and total phosphorus value (COD=290～400mg/L, TN=44-71mg/L, TP=3.78-9.23; This moment COD/TN=4.2-8.6).The SRT of poly-phosphorus sludge is 12～14d (not considering the biomembranous SRT of nitrification tank).The DO concentration set point of microbial film nitrification tank is 2～3mg/L, and the D0 concentration of back aeration tank is set in about 2mg/L.Flooding velocity is 43.2-48L/d, and will surmount mud and returned sluge flow is 12.9-14.4L/d, reflux ratio and surmount the mud ratio and be about about 33%.Simultaneously the ORP value of each reactor in the technology is carried out online detection, organic matter degradation and short distance nitration/denitrification situation in the real-time monitoring reaction device, this moment, system can maintain about 93%, 92.70% and 93.09% the average removal rate of COD, TN and TP.
Experiment effect three: the real life sewage with certain university's dependents' district discharging is former water, adds an amount of tap water dilution or adds glucose, NH
4Cl, KH
2PO
4Reach different COD, ammonia nitrogen and total phosphorus value (COD=290～400mg/L, TN=44-71mg/L, TP=3.78-9.23; This moment COD/TN=4.2-8.6).The SRT of poly-phosphorus sludge is 12～14d (not considering the biomembranous SRT of nitrification tank).The DO concentration set point of microbial film nitrification tank is 2～3mg/L, and the DO concentration of back aeration tank is set in about 2mg/L.Flooding velocity is 43.2-48L/d, surmount mud and be controlled at about 32%, the I group operation phase is controlled at 32% with returned sluge, and the II group operation phase is controlled at 65% with returned sluge, III group operation phase returned sluge is controlled at 100%, and table 1 is the comparison of test results of these three operation phase.From table, can find that when the returned sluge ratio was respectively 65% and 100%, system's water outlet nitric nitrogen and TP concentration and I stage (reflux ratio is 32%) were more approaching, be TN and go out water concentration and slightly raise, and the rising of TN be caused by ammonia nitrogen concentration substantially.As everyone knows, in the pre-denitrification and denitrogenation dephosphorization system, the denitrification percent of reflux ratio final decision system, and generally speaking, the big more denitrification percent of reflux ratio is high more; A
2The denitrogenation form of N technology belongs to the rear-mounted denitrification system, reflux ratio to the influence of denitrification effect than little many of Prepositive denitrification system, particularly under water inlet COD/TN ratio is not very low condition of water quality, the rear-mounted denitrification effect is better, water outlet nitric nitrogen concentration is lower, and it is little for the effect that improves system's denitrification effect to improve reflux ratio.In addition, in debug process, find the easier accumulation that causes the poly-phosphorus sludge of medium sediment pool of the increase of reflux ratio to technology.Therefore, when anoxic pond water outlet nitric nitrogen concentration is relatively lower, consider, needn't increase A from energy-conservation angle
2The return sludge ratio of N technology.
Table 1: the test-results cartogram (mean value) of different reflux ratios
| Project | Different reflux ratio group numbers | ||
| 1# (H stage) | 2# (II stage) | 3# (III stage) | |
| Reflux ratio (%) water inlet COD (mg/L) water outlet COD (mg/L) COD clearance (%) water outlet NO 3 --N (mg/L) water inlet TN (mg/L) water outlet TN (mg/L) TN clearance (%) water inlet TP (mg/L) anaerobic pond TP (mg/L) anoxic pond TP (mg/L) water outlet TP (mg/L) TP clearance (%) water outlet SS (mg/L) | 32 348 17.13 95.08 1.56 57.53 4.18 92.70 5.79 33.83 2.53 0.40 93.09 19 | 65 333.45 34.2 90.00 1.2 61.40 7.04 88.53 6.06 26.33 2.45 0.61 89.77 34 | 100 356.78 37.63 89.45 0.37 59.55 7.45 87.89 5.88 22.18 2.75 0.56 90.47 34 |
A of the present invention
2The mechanism of N denitrification dephosphorization sewage treatment process: denitrification dephosphorization (Denitrifyingphosphorus removal) can be called anoxic and inhale phosphorus, Anoxic phosphorus uptake, be meant under the condition of anaerobic/anoxic (anaerobic/anoxic) alternate run, tame out a class with NO
3 --N is as denitrification phosphorus-collecting bacterium (Denitrifying Phosphate-Removal Bacteria, the abbreviation DPB) superiority bacteria spp of final electron acceptor(EA), and they can be with NO
3 -As electron acceptor(EA), utilize internal carbon source (PHB), realize denitrification denitrogenation simultaneously and inhale the phosphorus effect by " carbon is dual-purpose " mode.Broken the theory that denitrogenation dephosphorizing that traditional denitrogenation dephosphorizing mechanism thought must be finished by obligate denitrifying bacteria and obligate polyP bacteria respectively, made dephosphorization and denitrification denitrogenation process realize with same quasi-microorganism, in this treating processes, NO
3 -No longer merely be considered as the damper of dephosphorization process, carry out the denitrifying phosphorus uptake reaction with it as final electron acceptor(EA), compare not only the COD consumption with traditional denitrification dephosphorization technique and can save 50%, the oxygen consumption reduces by 30%, and sludge yield also is expected to reduce 50%.Solved the contradictory relation between denitrogenation and dephosphorization in the traditional technology, inhaled phosphorus and do in order to NO
3 -Finish as electron acceptor(EA), can save oxygen-supplying amount, so the power consumption that drops into is few; Nitrifier is microbial film set growth, denitrification phosphorus-collecting bacterium suspension growth is in another system, both separation have solved the competition contradiction of polyP bacteria and nitrifier in the traditional technology, and this more helps the stable and efficient of dephosphorization, denitrification system, and controllability also is improved; Under the prerequisite that need not extensive mud backflow, just can make water outlet keep lower nitrate concentration; 5. the DPB sludge yield is expected to reduce, and reduces the sludge treatment expense.The present invention is specially adapted to the especially southern area municipal effluent denitrogenation dephosphorizing processing of carbon, nitrogen, phosphorus ratio imbalance of municipal effluent; Be fit to the lower sewage disposal of COD/TN ratio.
The present invention is process object with the sanitary sewage, to surmount mud ratio and returned sluge than being controlled at suitable scope, determined to remove the optimal operating parameter of organism, denitrogenation dephosphorizing process, improve nitrogen in the sewage, phosphorus and organic removal efficient, improved the stability and the controllability of system's operation.Be issued to efficient low consumption in the prerequisite that guarantees effluent quality.Solved problem nitrogenous, the sewage disposal of phosphorus eutrophication; And solved the unstable and lower problem of compliance rate of sewage denitrification and dephosphorization effect; Also solve the water outlet ammonia nitrogen, TN and the unmanageable practical problems of TP concentration that occur in the sewage disposal operational process, strengthened the optimization and the control of denitrification dephosphorization denitrification technology.
(4), description of drawings
Fig. 1 is A of the present invention
2N denitrifying and dephosphorizing sewage treatment process and schematic representation of apparatus thereof.
Fig. 2 be surmount mud than ≈ returned sluge than NH in=50% o'clock reaction tank
4 +The change curve of-N.
(5), embodiment
Embodiment is referring to Fig. 1, and idiographic flow of the present invention is: former water is introduced into anaerobic pond, and the denitrification phosphorus-collecting bacterium absorbs a large amount of organism at this, and stores in vivo with the form of PHB, discharges a large amount of phosphorus simultaneously.Muddy water is behind the medium sediment pool sharp separation subsequently, and the supernatant liquor that is rich in ammonia nitrogen and phosphorus flows to the aerobic biologic membrane nitrification tank, carries out nitration reaction, simultaneously the also aerobic remaining organism of having degraded.Directly enter anoxic pond and the poly-phosphorus sludge that precipitates has surmounted the biomembrance process nitrification tank, DPB is an electron donor with intravital PHB, the NO that provides with nitrification tank
3 -As electron acceptor(EA), finish denitrification denitrogenation and the effect of excessive suction phosphorus.The rearmounted design of aeration tank fast mainly is to be used for absorbing remaining phosphorus: anoxic pond, if polyP bacteria is incomplete to the absorption of phosphorus as first electron acceptor(EA) with nitric nitrogen, they just can absorb surplus phosphorus fully as second electron acceptor(EA) with oxygen in the quick aeration tank of postposition.
This A
2The N denitrifying and dephosphorizing sewage treatment process has following steps:
(1), pump is to anaerobic pond from water tank for former water, under stirring, the denitrification phosphorus-collecting bacterium absorbs a large amount of organism at this, and stores in vivo with the form of PHB, discharges a large amount of phosphorus simultaneously;
(2), the muddy water of discharging in the above-mentioned anaerobic pond enters medium sediment pool, through the medium sediment pool sharp separation;
(3), the above-mentioned medium sediment pool supernatant liquor that is rich in ammonia nitrogen and phosphorus of discharging, flow to the aerobic biologic membrane nitrification tank, carry out nitration reaction, simultaneously the also aerobic remaining organism of having degraded; It is characterized in that:
(4), simultaneously, the poly-phosphorus sludge that above-mentioned medium sediment pool precipitates claims to surmount mud, is directly pumped into anoxic pond, and DPB is an electron donor with intravital PHB, the NO that provides with nitrification tank
3 -As electron acceptor(EA), finish denitrification denitrogenation and the effect of excessive suction phosphorus, when handling sanitary sewage, will surmount in 10～33% scopes that sludge quantity is controlled at flooding velocity;
(5), the above-mentioned aerobic biologic membrane nitrification tank processed water of discharging enters anoxic pond, carries out hypoxia response under stirring;
(6), the processed water of discharging from anoxic pond enters quick aeration tank, is absorbed remaining phosphorus;
(7), the processed water of discharging from quick aeration tank enters final deposition pool, supernatant liquor is discharged from rising pipe, excess sludge is discharged from sludge pipe, part mud branches to mud return line, and be pumped to anaerobic pond, when handling sanitary sewage, with the returned sluge flow control at 10～40% of flooding velocity.
This A
2N denitrification dephosphorization waste disposal plant is by raw water tubes 1, water tank 2, pump 3, anaerobic pond 4, medium sediment pool 5, aerobic biologic membrane nitrification tank 6, anoxic pond 7, quick aeration tank 8, final deposition pool 9, rising pipe 10 order polyphones; Anaerobic pond and anoxic pond are built-in with whipping appts; Be connected with between medium sediment pool bottom and the anoxic pond bottom and surmount sludge pipe 11; Between final deposition pool bottom and anaerobic pond bottom, be communicated with reflux sludge tube 12.Blow-down pipe 13 is arranged at aerobic biologic membrane nitrification tank bottom, and there is bottom blow-down pipe 14 aeration tank fast.
Guaranteeing A
2In the N system under the prerequisite of the enough sludge quantities of anoxic pond, surmounting mud should be as far as possible little than the control of (surmounting mud discharge/flooding velocity), enter anoxic pond to prevent to surmount in the mud without nitrated sewage, the optimal control scope that surmount the mud ratio this moment is 10-33%.
Be controlled under the 10-33% prerequisite will surmounting the mud ratio, even water inlet C/N lower (C/N ≈ about 3.09～4.2), return sludge ratio (mud return flow/flooding velocity) is controlled at 26-40%, and system also can reach respectively about 84.2% and 92% the clearance of TN and TP.
When water inlet C/N when being 4.2≤C/N≤9, consider from energy-conservation angle, needn't increase return sludge ratio, promptly the returned sluge ratio can be controlled at 10-33%, this moment, the denitrogenation dephosphorizing effect of system can reach optimum regime simultaneously, and promptly average removal rate reaches 92.7% and 93.09% respectively.
The present invention can judge the denitrification degree of system by the ORP Changing Pattern of anoxic pond and anaerobic pond, controls the returned sluge ratio automatically according to the online detection of ORP.
Surmount mud discharge and pass through nitrated and directly enter the ammonia-nitrogen content of anoxic pond, finally influence the ammonia nitrogen concentration of system's water outlet than directly determining.In order to reduce the ammonia nitrogen concentration of water outlet as far as possible, the control principle that surmounts mud discharge is exactly under the prerequisite that guarantees anoxic pond capacity mud, reduces its value to greatest extent, and the span of control that the operation practice values can reach is 10-33%.Generally speaking, the big more denitrification percent of reflux ratio is high more; When water inlet C/N ratio be (4.2≤C/N≤9), when carbon source is sufficient, nitric nitrogen concentration is low in the water outlet, consider from energy-conservation angle, needn't increase the mud ratio, this moment can returned sluge with surmount the mud ratio and be set to equivalence, promptly.If but water inlet C/N (C/N ≈ 3.09～4.2) on the low side when denitrification is incomplete, then needs the C/N ratio according to reality, improves the reflux ratio of system neatly.But because the nitric nitrogen that contains enters in system's anaerobic pond in a large number in the returned sluge, can suppress anaerobism and put phosphorus reaction, finally influence the phosphor-removing effect of system, so comprehensive nitrogen, both place to go effects of phosphorus can be controlled at 30-40% with the returned sluge ratio.
The present invention is to returned sluge and surmount mud than the realization optimal control, and can change neatly and these two ratios of adjusting according to influent quality characteristics concentration; Also can utilize the online detection of ORP value simultaneously, hold the degree that the denitrification nitrogen and phosphorus removal biochemical reaction process carries out exactly, regulate the returned sluge ratio in time, thereby improve A greatly
2Stability and controllability that N system nitrogen phosphorus is removed guarantee that effluent quality is up to standard, save working cost.
Claims (1)
1, a kind of A
2The N denitrifying and dephosphorizing sewage treatment process has following steps:
(1), pump is to anaerobic pond from water tank for former water, under stirring, the denitrification phosphorus-collecting bacterium absorbs a large amount of organism at this, and stores in vivo with the form of PHB, discharges a large amount of phosphorus simultaneously;
(2), the muddy water of discharging in the above-mentioned anaerobic pond enters medium sediment pool, through the medium sediment pool sharp separation;
(3), the above-mentioned medium sediment pool supernatant liquor that is rich in ammonia nitrogen and phosphorus of discharging, flow to the aerobic biologic membrane nitrification tank, carry out nitration reaction, simultaneously the also aerobic remaining organism of having degraded; It is characterized in that:
(4), simultaneously, the poly-phosphorus sludge that above-mentioned medium sediment pool precipitates claims to surmount mud, is directly pumped into anoxic pond, and DPB is an electron donor with intravital PHB, the NO that provides with nitrification tank
3 -As electron acceptor(EA), finish denitrification denitrogenation and the effect of excessive suction phosphorus, when handling sanitary sewage, will surmount in 10～33% scopes that sludge quantity is controlled at flooding velocity;
(5), the above-mentioned aerobic biologic membrane nitrification tank processed water of discharging enters anoxic pond, carries out hypoxia response under stirring;
(6), the processed water of discharging from anoxic pond enters quick aeration tank, is absorbed remaining phosphorus;
(7), the processed water of discharging from quick aeration tank enters final deposition pool, supernatant liquor is discharged from rising pipe, excess sludge is discharged from sludge pipe, part mud branches to mud return line, and be pumped to anaerobic pond, when handling sanitary sewage, with the returned sluge flow control at 10～40% of flooding velocity.
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| JP5315587B2 (en) * | 2005-12-27 | 2013-10-16 | 栗田工業株式会社 | Apparatus and method for treating wastewater containing organic matter |
| CN100357196C (en) * | 2006-01-06 | 2007-12-26 | 哈尔滨工业大学 | Process for nitrating synchronous phosphorus removing denitrogen of composite type active mud oxygen-dificient poly-phosphorus biological film |
| CN101130447B (en) * | 2007-06-08 | 2010-06-09 | 北京工业大学 | Optimal Control Method of Denitrification and Phosphorus Release in Secondary Settling Tank of A2/O Process |
| CN101372378B (en) * | 2008-04-30 | 2010-09-15 | 北京工业大学 | The method of using SBR for rapid start-up of continuous flow double sludge denitrification and phosphorus removal process |
| CN101508504B (en) * | 2009-03-27 | 2010-09-22 | 南京林业大学 | Single sludge denitrification device and method for phosphorus and nitrogen removal |
| CN101597125B (en) * | 2009-07-09 | 2011-06-22 | 北京科技大学 | A biofilm process for coking wastewater treatment |
| CN101830603B (en) * | 2010-05-19 | 2012-12-19 | 哈尔滨工业大学深圳研究生院 | System and method for removing phosphorus by three-mud process nitrification and denitrification |
| CN102086061B (en) * | 2010-12-17 | 2012-07-25 | 哈尔滨工业大学 | AOA (Angles-Of-Arrival) continuous flow biological nitrogen and phosphorus removal process for sewage treatment |
| WO2013025792A2 (en) * | 2011-08-15 | 2013-02-21 | The Board Of Trustees Of The Leland Stanford Junior University | Microbial production of nitrous oxide coupled with chemical reaction of gaseous nitrous oxide including phosphorus recovery and nitrite reduction to nitrous oxide |
| CN103011520B (en) * | 2012-12-23 | 2013-11-06 | 北京工业大学 | A method for starting A2N two-stage SBR denitrification phosphorus removal |
| CN103663693B (en) * | 2013-11-15 | 2015-08-19 | 广州中科碧疆环保科技有限公司 | High-concentration ammonia-nitrogen treatment of Organic Wastewater combination unit and method |
| WO2017005154A1 (en) * | 2015-07-07 | 2017-01-12 | 洪胜男 | High-efficiency wastewater denitrification and dephosphorization process and system |
| CN105174630B (en) * | 2015-09-25 | 2017-12-01 | 句容市深水水务有限公司 | Low carbon-nitrogen ratio sewage denitrification dephosphorization system and method based on biotechnology |
| CN105776544B (en) * | 2016-05-06 | 2018-06-12 | 云南大学 | A kind of ANSAOAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus and technique based on On-line Control |
| CN110015756A (en) * | 2019-04-11 | 2019-07-16 | 华北水利水电大学 | A denitrification and phosphorus removal coupled vibration anoxic MBR device and process |
| CN114772731B (en) * | 2022-04-19 | 2023-08-22 | 青岛思普润水处理股份有限公司 | AOA coupling autotrophic nitrogen removal water treatment method and system based on BFM form |
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