CN102381801A - Method for treating waste water by membrane bioreactor - Google Patents
Method for treating waste water by membrane bioreactor Download PDFInfo
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- CN102381801A CN102381801A CN2010102664723A CN201010266472A CN102381801A CN 102381801 A CN102381801 A CN 102381801A CN 2010102664723 A CN2010102664723 A CN 2010102664723A CN 201010266472 A CN201010266472 A CN 201010266472A CN 102381801 A CN102381801 A CN 102381801A
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- membrane bioreactor
- mud
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- biological treatment
- sludge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Activated Sludge Processes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method for treating waste water by a membrane bioreactor. Aiming at the problems that a membrane bioreactor is easy to be polluted and refractory organic matters are accumulated in a system, the method for treating waste water by a membrane bioreactor utilizes a membrane bioreactor pre-biological treatment system to form sludge backflow, and thus membrane pollution is reduced and a service life is prolonged. The method for treating waste water by a membrane bioreactor can reduce direct impact of abnormal feed water on a membrane system in membrane bioreactor running, realizes removal or transfer of refractory organic matters in a reactor, prevents accumulation of refractory organic matters causing membrane pollution and plugging in a tank, combines with a pre-biological treatment flow thereby improving a organic matter clearance rate, reduces membrane pollution, and prolongs a service life.
Description
Technical field
The present invention relates to environmental engineering and technical field of waste water processing, is a kind of method of Membrane Bioreactor for Wastewater Treatment waste water specifically.
Background technology
Membrane bioreactor is a kind of treatment technology of new bio+film; It has utilized the microfiltration membrane that is placed in the aeration tank, holds back the active sludge in the aeration tank, can improve the sludge concentration in the aeration tank; Prolong mud mud age, under appropriate condition, help the growth of nitrifier.
Because membrane bioreactor has combined membrane separation technique and biologic treating technique; Can replace the second pond in the activated sludge process; Carry out solid-liquid separation; Compared effluent quality with traditional biochemical treatment good, stable, takes up an area of advantages such as little, convenient old factory upgrading, is the technology of a kind of WWT and resource utilization.In practical application, find; Its main drawback is that hardly degraded organic substance was accumulated easily after the biodegradable organism in membrane biological reaction pond decomposed completion; Especially the membrane biological reaction pond receives undesiredly when coming water slug, and organic moment improves in the membrane bioreactor, aggravates the pollution of film especially; Microfiltration membrane in the pond makes large amount of organic in time not get rid of or to shift, and shortens the scavenging period and the work-ing life of film.
The 200710120388.9 open dates of Chinese patent: on March 12nd, 2008, title: a kind of method for processing organic wastewater discloses a kind of method for processing organic wastewater with membrane bioreactor of dephosphorization denitrogenation function.This method is to be provided with an anoxic pond in the front of typical anaerobic-anoxic-aerobic denitrification and dephosphorization method, in this method an Aerobic Pond that adopts integral type film biological reactor is set at the back.The flow process of this patent mainly is to the dephosphorization denitrogenation in the waste water, pollutes control and preposition biological treatment and the not explanation of membrane bioreactor relation for film.
The open date of Chinese patent 200820229111.X: on August 26th, 2009; Title: membrane bioreactor discloses a kind of oxidation ditch, product pond, water transfer pump and tubular membrane of comprising; Said oxidation ditch, water transfer pump, tubular membrane; And produce the pond and be connected in order, in addition, the mud liquid concentrator outlet end of tubular membrane is connected to oxidation ditch.This patent is actual to be split type membrane bioreactor system, with the technology of this patent bigger difference is arranged.
The 200410009624.6 open dates of Chinese patent: on March 30th, 2005; Title: mixed liquor characteristics regulate and control method in a kind of membrane bioreactor that controlling diaphragm pollutes; Mixed liquor characteristics regulate and control method in a kind of membrane bioreactor that a kind of controlling diaphragm pollutes is disclosed; Provide a kind of ozone that utilizes that the mixed solution in the membrane bioreactor is effectively handled, utilized ozonizer to produce ozone, not to be higher than 1mg O
3The ozone dosage of/g-SS focuses on the mixed solution in the said membrane bioreactor; Perhaps the partially mixed liquid in the said membrane bioreactor is pumped in the ozone reaction pond, utilizes dosage to be higher than 100mg O through sludge circulation pump
3The ozone of/g-SS is handled the mixed solution in ozone reaction pond, and the mixed solution after will handling then is circulated in the said membrane bioreactor and mixes with former mixed solution.This patent mainly adopts the film in the ozone clean membrane bioreactor to pollute, and is different fully with control on this patent flow process.
Summary of the invention
To the defective that exists in the prior art; The object of the present invention is to provide a kind of method of Membrane Bioreactor for Wastewater Treatment waste water, can reduce that membrane bioreactor is in service undesiredly to come water directly to impact the film system, hardly degraded organic substance is discharged or is shifted in the reactor drum; Prevent to cause in the pond accumulation of the dirty hardly degraded organic substance that blocks up of film; Combine to improve organic removal rate with preposition biological treatment flow process, and reduce the pollution of film, prolong its work-ing life.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of method of Membrane Bioreactor for Wastewater Treatment waste water is characterized in that, its concrete steps are:
Pending sewage is as coming water to get into preposition biological treatment tank 1 and bubbling air, and said preposition biological treatment tank is the aeration tank;
Mixed solution in the preposition biological treatment tank 1 gets into front sedimentation tank 3, and mixed solution is carried out mud-water separation,
The mud part of post precipitation is back to preposition biological treatment tank 1 feed-water end through preposition sludge reflux pump 2 with it, and control of reflux ratio is 50～150%, and the mud of remainder effluxes, and waits for that after dehydration getting into subsequent processes continues to handle,
The supernatant of settling tank gets into membrane bioreactor 4 and bubbling air, further removes organism, and the sewage after membrane bioreactor 4 is handled effluxes after filtering through the membrane module 5 that places membrane bioreactor,
The water outlet side of said membrane bioreactor is provided with a cover mud return-flow system, and this mud return-flow system is carried out little backflow simultaneously and refluxed with big,
Said little return-flow system is back to the membrane bioreactor feed-water end through membrane bioreactor sludge reflux pump 6 with part membrane bioreactor mud,
Said big return-flow system is back to preposition biological treatment tank feed-water end through membrane bioreactor sludge reflux pump 6 with part membrane bioreactor mud,
And the quantity of reflux of membrane bioreactor sludge reflux pump is confirmed according to the membrane bioreactor sludge loading.
On the basis of technique scheme, sludge loading in the membrane bioreactor and mud are back to preposition biological treatment tank and satisfy following relational expression:
Q＝10
L×C，
In the formula:
Q-return sludge ratio, unit are %
L-sludge loading, unit are kgCOD/kgMLVSSd
C-coefficient, value are 20～100;
Little return-flow system control of reflux ratio is 50～100%.
The method of Membrane Bioreactor for Wastewater Treatment waste water of the present invention; Can reduce that membrane bioreactor is in service undesiredly to come water directly to impact the film system; Hardly degraded organic substance is discharged or is shifted in the reactor drum, prevents to cause in the pond accumulation of the dirty hardly degraded organic substance that blocks up of film, combines to improve organic removal rate with preposition biological treatment flow process; And the pollution of minimizing film, prolong its work-ing life.
The invention has the beneficial effects as follows:
1, can alleviate membrane pollution of membrane bioreactor after adopting this technology, be mainly reflected in the prolongation of scavenging period, steady running after 1 year the matting time can prolong about 30 days.
2, through setting up the mud return-flow system with preposition biological treatment, the accumulation and the pollution that reduce refractory organic (like petroleum-type) in the membrane bioreactor can be fallen.
3, membrane bioreactor is provided with preposition biosystem, can improve overall biological treatment effect, and the clearance of pollutent can improve 5～90%.
Description of drawings
The present invention has following accompanying drawing:
The process flow diagram of the method for Fig. 1 Membrane Bioreactor for Wastewater Treatment waste water.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
The method of Membrane Bioreactor for Wastewater Treatment waste water of the present invention; Organism cumulative problem in system to membrane bioreactor pollution and difficult degradation; Proposition is provided with the preposition biological treatment system of membrane bioreactor; And form the mud backflow with it, and pollute to reduce film, increase the service life.This technology can be avoided undesired and come water directly to impact the film in the membrane bioreactor; Through controlling diaphragm bio-reactor sludge loading and with the mud quantity of reflux of preposition biological treatment, reduce the organism of difficult for biological degradation and in membrane bioreactor, accumulate; Use the biological treatment serial flow, but the degree of depth of efficient hardening biological treatment improves the COD clearance.
The method of Membrane Bioreactor for Wastewater Treatment waste water of the present invention, its technical process is as shown in Figure 1:
For receiving, the film of avoiding membrane bioreactor undesiredly come water directly to impact; Adopt rearmounted membrane bioreactor flow process; Before membrane bioreactor, be provided with at least one section complete biological treatment system; Reduce the undesired impact that comes water to the membrane bioreactor film, reduce the dirty stifled risk of membrane bioreactor
For reducing the accumulation of hardly degraded organic substance in the membrane bioreactor system; Solve " toxin expelling " of membrane bioreactor system, set up big return-flow system with the leading portion biological treatment system, according to the sludge loading in the membrane bioreactor; Set reflux ratio with membrane bioreactor residual sludge reflux to leading portion biological treatment system; And take away cumulative hardly degraded organic substance in the pond, when the leading portion excess sludge is discharged " toxin expelling ", prevent to cause the accumulation of the dirty stifled hardly degraded organic substance of membrane bioreactor film.
The present invention not only can reduce film and pollute owing to adopted the biological treatment serial flow, but the degree of depth handled of enhanced biological also, and stabilizing membrane bioreactor for treatment effect improves the COD clearance.
The method of Membrane Bioreactor for Wastewater Treatment waste water of the present invention, its concrete steps are:
Pending sewage is as coming water to get into preposition biological treatment tank 1 and bubbling air, and said preposition biological treatment tank is the aeration tank; Preposition biological treatment tank is used to remove partial organic substances, and plays and reduce undesired effect of coming water directly to impact membrane bioreactor 4;
Mixed solution in the preposition biological treatment tank 1 gets into front sedimentation tank 3, and mixed solution is carried out mud-water separation,
The mud part of post precipitation is back to preposition biological treatment tank 1 feed-water end through preposition sludge reflux pump 2 with it, and control of reflux ratio is 50～150%, and the mud of remainder effluxes, and waits for that after dehydration getting into subsequent processes continues to handle,
The supernatant of settling tank gets into membrane bioreactor 4 and bubbling air; Further remove organism; Sewage after membrane bioreactor 4 is handled effluxes after filtering through the membrane module 5 that places membrane bioreactor, and promptly the water side of membrane module forms the water outlet of membrane bioreactor
The water outlet side of said membrane bioreactor is provided with a cover mud return-flow system, and this mud return-flow system is carried out little backflow simultaneously and refluxed with big,
Said little return-flow system is back to the membrane bioreactor feed-water end through membrane bioreactor sludge reflux pump 6 with part membrane bioreactor mud,
Said big return-flow system is back to preposition biological treatment tank feed-water end through membrane bioreactor sludge reflux pump 6 with part membrane bioreactor mud,
And the quantity of reflux of membrane bioreactor sludge reflux pump is confirmed according to the membrane bioreactor sludge loading.The mud return-flow system can be accomplished little backflow and big backflow by a shared membrane bioreactor sludge reflux pump, and little backflow can be worked with big backflow simultaneously, and the concrete measurement of quantity of reflux can be adopted existing techniques in realizing, and for example: available valve and under meter are controlled.
If the mud quantity of reflux is excessive, then membrane bioreactor mud is very few,
If the mud quantity of reflux is less, then " toxin " accumulation easily in the membrane bioreactor.
On the basis of technique scheme, sludge loading in the membrane bioreactor and mud are back to preposition biological treatment tank has certain relation, and specifically, the two satisfies following relational expression:
Q＝10
L×C，
In the formula:
Q-return sludge ratio, unit are %
L-sludge loading, unit are kgCOD/kgMLVSSd
C-coefficient, value are 20～100;
Little return-flow system control of reflux ratio is 50～100%.
Characteristics of the present invention are following:
1, the preposition biological treatment system of membrane bioreactor; Partial organic substances can obtain removing at preposition biological treatment system; Preposition biological treatment has anaerobism or anoxic process also can improve its biodegradability, and helps improving the biological treatment degree of depth after membrane bioreactor combines; Anaerobism that preposition biological treatment system can be or aerobe are handled; Can connect or parallel connection; Preposition biological treatment is provided with sludge-water separating system, and can continuously or discharge excess sludge intermittence.
2, membrane bioreactor is provided with from return-flow system, and water side mud can be back to feed-water end;
3, membrane bioreactor and preposition biological treatment system are provided with the mud return-flow system, can be back to preposition biological treatment system through sludge reflux pump and pipeline, and the terminal mud in preposition aeration tank can flow directly into membrane bioreactor.
It below is specific embodiment.
Embodiment 1
Certain petrochemical plant waste water is after oil removal, flotation, and biological treatment is adopted and adopted membrane bioreactor and preposition biological treatment (A/O)+Membrane Bioreactor for Wastewater Treatment technology respectively, and treatment effect sees attached list 1.
Subordinate list 1
Can find out from subordinate list 1, only adopt Membrane Bioreactor for Wastewater Treatment technology, the average removal rate of COD, ammonia nitrogen and petroleum-type is respectively 85.9% ,-7.7% and 74.1%, about 55 days of the film scavenging period after the steady running.Because the organonitrogen in the waste water exists, the single stage membrane bio-reactor can only carry out aminating reaction, does not have nitrated or nitrated speed basically less than ammonification.
Only adopt one section A/O treatment process, the average removal rate of COD, ammonia nitrogen and petroleum-type is respectively 46.0%, 27.8% and 35.2%.
After adopting A/O+ Membrane Bioreactor for Wastewater Treatment technology; The overall average clearance of COD, ammonia nitrogen and petroleum-type is respectively 89.6%, 90.7% and 91.4%; Improve 4.7%, 98.4% and 17.3% respectively than MBR flow process only, improve 43.6%, 62.9% and 56.2% respectively than A/O flow process only.
Membrane bioreactor is 0.19kgCOD/kgMLVSSd at sludge loading, and the return sludge ratio of preposition A/O biological treatment system is between 35～60%, about 80 days of the film scavenging period after the steady running.
Embodiment 2
Certain petrochemical plant waste water is after oil removal, flotation, and preposition biological treatment (A/O)+membrane biological reactor process is adopted in biological treatment, and treatment effect sees attached list 2.
Subordinate list 2
Can find out that from subordinate list 2 only adopt one section A/O treatment process, the average removal rate of COD, ammonia nitrogen and petroleum-type is respectively 40.1% ,-2.3% and 33.3%.
After adopting A/O+ Membrane Bioreactor for Wastewater Treatment technology, the overall average clearance of COD, ammonia nitrogen and petroleum-type is respectively 87.8%, 99.2% and 89.2%, improves 47.7%, 101.5% and 55.9% respectively than A/O flow process only.
Membrane bioreactor is 0.18kgCOD/kgMLVSSd at sludge loading, and the return sludge ratio of preposition A/O biological treatment system is between 30～50%, about 90 days of the film scavenging period after the steady running.
Claims (2)
1. the method for a Membrane Bioreactor for Wastewater Treatment waste water is characterized in that, its concrete steps are:
Pending sewage is as coming water to get into preposition biological treatment tank 1 and bubbling air, and said preposition biological treatment tank is the aeration tank;
Mixed solution in the preposition biological treatment tank 1 gets into front sedimentation tank 3, and mixed solution is carried out mud-water separation,
The mud part of post precipitation is back to preposition biological treatment tank 1 feed-water end through preposition sludge reflux pump 2 with it, and control of reflux ratio is 50～150%, and the mud of remainder effluxes, and waits for that after dehydration getting into subsequent processes continues to handle,
The supernatant of settling tank gets into membrane bioreactor 4 and bubbling air, further removes organism, and the sewage after membrane bioreactor 4 is handled effluxes after filtering through the membrane module 5 that places membrane bioreactor,
The water outlet side of said membrane bioreactor is provided with a cover mud return-flow system, and this mud return-flow system is carried out little backflow simultaneously and refluxed with big,
Said little return-flow system is back to the membrane bioreactor feed-water end through membrane bioreactor sludge reflux pump 6 with part membrane bioreactor mud,
Said big return-flow system is back to preposition biological treatment tank feed-water end through membrane bioreactor sludge reflux pump 6 with part membrane bioreactor mud,
And the quantity of reflux of membrane bioreactor sludge reflux pump is confirmed according to the membrane bioreactor sludge loading.
2. the method for Membrane Bioreactor for Wastewater Treatment waste water as claimed in claim 1 is characterized in that: sludge loading in the membrane bioreactor and mud are back to preposition biological treatment tank and satisfy following relational expression:
Q＝10
L×C，
In the formula:
Q-return sludge ratio, unit are %
L-sludge loading, unit are kgCOD/kgMLVSSd
C-coefficient, value are 20～100;
Little return-flow system control of reflux ratio is 50～100%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755100A (en) * | 2014-01-21 | 2014-04-30 | 重庆林德科技发展有限公司 | Method for solving membrane bio-reactor (MBR) membrane blocking and composite MBR membrane bio-reaction system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1511796A (en) * | 2002-12-27 | 2004-07-14 | 中国科学院生态环境研究中心 | Push flow composite biological mud volume reducing reactor and its operation method |
| CN1668539A (en) * | 2002-08-05 | 2005-09-14 | Otv股份有限公司 | Method and facility for treatment of sludge derived from biological water purification facilities |
| CN101381156A (en) * | 2008-03-25 | 2009-03-11 | 北京桑德环境工程有限公司 | Sewage disposal system combining membrane bioreactor and phosphorus recovery and processing method |
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- 2010-08-30 CN CN2010102664723A patent/CN102381801B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1668539A (en) * | 2002-08-05 | 2005-09-14 | Otv股份有限公司 | Method and facility for treatment of sludge derived from biological water purification facilities |
| CN1511796A (en) * | 2002-12-27 | 2004-07-14 | 中国科学院生态环境研究中心 | Push flow composite biological mud volume reducing reactor and its operation method |
| CN101381156A (en) * | 2008-03-25 | 2009-03-11 | 北京桑德环境工程有限公司 | Sewage disposal system combining membrane bioreactor and phosphorus recovery and processing method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755100A (en) * | 2014-01-21 | 2014-04-30 | 重庆林德科技发展有限公司 | Method for solving membrane bio-reactor (MBR) membrane blocking and composite MBR membrane bio-reaction system |
| CN103755100B (en) * | 2014-01-21 | 2015-04-22 | 重庆林德科技发展有限公司 | Method for solving membrane bio-reactor (MBR) membrane blocking and composite MBR membrane bio-reaction system |
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