CN1600705A - Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution - Google Patents
Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution Download PDFInfo
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- CN1600705A CN1600705A CNA2004100096246A CN200410009624A CN1600705A CN 1600705 A CN1600705 A CN 1600705A CN A2004100096246 A CNA2004100096246 A CN A2004100096246A CN 200410009624 A CN200410009624 A CN 200410009624A CN 1600705 A CN1600705 A CN 1600705A
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- ozone
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- membrane bioreactor
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- 239000012528 membrane Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 17
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims description 51
- 239000010802 sludge Substances 0.000 claims description 47
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 18
- 230000001276 controlling effect Effects 0.000 description 13
- 230000003647 oxidation Effects 0.000 description 12
- 238000007254 oxidation reaction Methods 0.000 description 12
- 230000009194 climbing Effects 0.000 description 10
- 239000005446 dissolved organic matter Substances 0.000 description 9
- 238000005374 membrane filtration Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000006385 ozonation reaction Methods 0.000 description 8
- 239000000084 colloidal system Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 230000001351 cycling effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000005276 aerator Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- -1 MLSS Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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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
Landscapes
- Activated Sludge Processes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
For improving properties of mixed liquid in membrane biologic reactor, membrane pollution developing speed is controlled to stabilize operation of membrane biologic reactor. The invention provides a method that ozone is utilized to treat mixed liquid in membrane biologic reactor effectively to improve properties of mixed liquid thus to control membrane pollution. The partical steps are in following; ozone generator is used to produce ozone, ozone inventory is mot more than 1mg O3/g-ss which is used to do centralized treatment for the mixed liquid in the membrane biologic reactor, or mud circulating pump is used to pump some mixed liquid in said membrane biologic reactor, or mud circulating pump is used to pump some mixed liquid in said membrane biologic reactor into ozone reaction tank to be treated by adding ozone that inventory is more than 100 mg O3/g-ss, then treated mixed liquid is circulated into said membrane biologic reactor to be mixed with original mixed liquid.
Description
Technical field
The present invention relates to a kind of membrane pollution problem and regulate and control the method for mixed liquor characteristics, belong to water and technical field of waste water processing for the controlling diaphragm bio-reactor.
Background technology
Membrane bioreactor is with biological respinse unit and a kind of efficient wastewater processing technology of the fine bonded of membrane separation technique.Can hold back microorganism by film, realize separating of hydraulic detention time and sludge age, pollution substance processing efficiency height, effluent quality height and stable; And the film bioreactor device compact construction, easily realize automatization control.But in service at membrane bioreactor, film will take place inevitably to be polluted.Film pollutes and causes membrane flux to descend, and cleaning frequency membrane strengthens, and causes working cost to increase, and membrane lifetime shortens, and has also brought very big inconvenience to operational management simultaneously.Therefore the control that relevant film pollutes becomes the key issue of membrane bioreactor in applying.
To the control that film pollutes, can carry out from the selection of mould material, the control of membrane sepn condition, the aspects such as regulation and control of active sludge intermixture character.In the patent documentation at home and abroad, have and adopt to throw in flocculation agent active sludge intermixture character in the membrane bioreactor is regulated and control to reach purpose that controlling diaphragm pollutes as " preventing that film from polluting and keeping the flucculation process (Chinese invention patent 03130415.X, applying date 2003.7.18) of membrane flux "., ozone technology also do not have but thereby being used for the report that the regulation and control controlling diaphragm of membrane bioreactor active sludge intermixture pollutes.About the existing relevant patent of ozone technology and activated sludge process bonded technology, but what be primarily aimed at is to utilize ozone excess sludge to be carried out the method for decrement for reducing the excess sludge generation in the active sludge water technology, as " a kind of method and device (Chinese invention patent 03138936.8; applying date 2003.7.30) that utilizes ozone oxidation to make sludge decrement ", about ozone is not seen any research and restriction to the regulating effect of the membrane filtration character of membrane bioreactor mixed solution.Report is abroad arranged at present, and using ozone oxidation in the traditional activated sludge process technological process can realize the purpose of mud decrement in activated sludge process, and the using ozone oxidation realizes that mud decrement yet there are no report in membrane bioreactor.
Summary of the invention
Inventor's long term studies shows that the membrane bioreactor mixed liquor characteristics is very big to the film pollution effect, and wherein the significant effects factor comprises mixed solution dissolved organic matter concentration, colloid concentration and sludge concentration.When the membrane bioreactor organic loading very long one section of high or operation the time after, mixed solution sludge concentration and organic substance concentration appear when too high, film pollutes and will increase the weight of.For the mixed liquor characteristics in the membrane bioreactor is improved, controlling diaphragm pollutes development speed, the operation of stabilizing membrane bio-reactor, reduce the running cost of membrane bioreactor, the invention provides a kind of ozone that utilizes effectively handles the mixed solution in the membrane bioreactor, thereby to improve the method that the mixed liquor characteristics controlling diaphragm pollutes, concrete measure is as follows:
Utilize ozonizer to produce ozone, not to be higher than 1mg O
3The ozone dosage of/g-SS focuses on the mixed solution in the described membrane bioreactor; Perhaps the partially mixed liquid in the described membrane bioreactor is pumped in the ozone reaction pond, utilizes dosage to be higher than 100mg O by 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 described membrane bioreactor and mixes with former mixed solution.Through the mixed solution membrane filtration enhancing of above processing, sludge concentration reduces, and can reach controlling diaphragm and pollute, and reduces the purpose of excess sludge generation simultaneously.
Membrane bioreactor of the present invention is to have the integral type of suspension type active sludge biological reaction member or the membrane bioreactor of separated type.Utilize cytoclasis and the organic oxygenizement of ozone to the active sludge intermixture in the membrane bioreactor, promote various effects such as biological reflocculation, improve the membrane filtration of mixed solution, controlling diaphragm pollutes, and keeps reactor steady running.
The present invention proposes and utilize ozone that the mixed solution in the membrane bioreactor is effectively handled, thereby to improve the method that the mixed liquor characteristics controlling diaphragm pollutes, its principle is: membrane bioreactor is with membrane separation technique and fine bonded water of biological processing unit and wastewater treatment equipment, effluent quality is high and stable, structure of reactor compactness, easily automatization control.Membrane bioreactor is applied to the pollution that one of problem of most critical in the water treatment is a film.And the character of the active sludge intermixture in the reactor is very big to the influence that film pollutes.The feature of membrane bioreactor mixed solution is because organic loading is high and the efficient crown_interception of film, make dissolved organic matter matter and sludge concentration all be higher than common bio-reactor, problems such as thereby cause that viscosity is too high, the floc particle granularity is little, and organic concentration is too big.Therefore, adopt ozone technology that mixed solution is carried out suitable processing, utilize the oxidation capacity of ozone, can improve mixed liquor characteristics, to reach the purpose that controlling diaphragm pollutes.
Ozone oxidation is mainly reflected in the following aspects to the regulating effect of active sludge intermixture character: (1) ozone oxidation has crushing effect to the active sludge cell, can reduce sludge concentration.(2) ozone oxidation has oxygenizement to organism, the dissolved organic matter that dissolved organic matter in can the former mixed solution of oxidation and active sludge cytoclasis discharge.And can be further the dissolved organic matter matter oxidation of some difficult degradations be generated the organic substance that easily is degraded by microorganisms and utilizes, utilized easilier, strengthen the sludge organism activity by active sludge.(3) the part larger molecular organics that cytoclasis discharged that causes of ozonization can also be brought into play the effect of biological flocculant, and the colloid in the mixed solution is become floc particle, makes that grain graininess becomes big in the mixed solution.The comprehensive action of above several respects makes mixed liquor suspended solid, MLSS, colloid and dissolved organic matter content reduce, viscosity reduces, and it is big that the mud granule particle diameter becomes, thereby has strengthened the membrane filtration characteristic of mixed solution, reach the controlling diaphragm pollution, kept the reactor aim of stable operation.
Based on above principle, the present invention can directly feed small amount of ozone in the membrane bioreactor, active sludge intermixture is directly handled, perhaps a certain proportion of mixed solution cycling stream is gone out biological reaction tank through behind an amount of ozonization, be back in the aeration reactor again, with undressed mixed solution mixing effect, improve the mixed solution membrane filtration characteristic, pollute purpose thereby can reach controlling diaphragm.Ozonize can be selected intermittent type or continous way.
Using the present invention and membrane bioreactor unites when water and waste water handled, can reach following effect: one, controlling diaphragm pollutes, the membrane filtration characteristic of mixed solution is strengthened, keep steadily lower membrane operations pressure, guarantee the long-term stability operation of membrane bioreactor; Two, the control biomass reduces spoil disposal, and sludge concentration is stable within the specific limits, can realize membrane bioreactor not spoil disposal steady running for a long time; Three, strengthen the biological activity of mud, reduce organic concentration, the oxidized portion hard-degraded substance improves treatment effect.
Description of drawings
Fig. 1 is the structural representation of the film bioreactor device of the realization embodiment of the invention one.
Fig. 2 is the structural representation of the film bioreactor device of the realization embodiment of the invention four.
Fig. 3 is that the film in the embodiment of the invention four pollutes the evolution synoptic diagram.
Embodiment
The membrane bioreactor that the present invention adopts by reaction tank, membrane module, air feeder, go out water pump and several parts of ozone generating-device are formed, and be provided with water-in and water outlet.Utilize ozonizer to produce finite concentration ozone, directly import in the reactor, the mixed solution in the reactor is carried out intermittence or periodically successive processing with certain flow; Perhaps, in drainage tube drainage to an ozonize reactor, the part active sludge intermixture is carried out the successive ozonize, be back to then in the reactor and mix with former mixed solution with active sludge intermixture.Ozonize can be chosen in the too high 7g/L of surpassing of mixed solution sludge concentration, the too high 50mg/L that surpasses of supernatant liquor organic concentration, adopt when perhaps resistance of membrane filtration suddenly rises, directly whole mixed solutions are carried out focusing on of short period of time, dosage is not higher than 1mg O
3/ g-SS; Perhaps, the partially mixed liquid in the described membrane bioreactor is pumped in the ozone reaction pond, utilizes dosage to be higher than 100mg O by sludge circulation pump at the bigger situation of the biomass in the membrane bioreactor
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 described membrane bioreactor and mixes with former mixed solution.Concrete selected ozone dosage, mud mixed liquid ratio, will be according to selections such as the middle dissolved organic matter content of mixed solution and sludge concentrations, oxidation and crushing effect with balance ozone, should allow ozone that abundant inertia organism is converted into easily biodegradable organics, promote the effect of biological reflocculation as far as possible, avoid cytoclasis too much again, cause that organic content excessively raises.
Embodiment one
Fig. 1 represents the film bioreactor device of the ozone regulation and control mixed solution of embodiment one, and this installs by ozonizer 1, biological reaction tank 2, membrane module 3, go out water pump 4, aerator 5, ozone tail gas cuvette 6, ozone reaction pond 7, sludge circulation pump 8, sludge circulation pump 9 compositions such as grade.According to the conventional film bio-reactor, this device has increased the ozonization system that ozone generating-device and ozone reaction pond etc. constitute.
The structure of present embodiment is described in detail as follows in conjunction with Fig. 1:
Present embodiment carries out the membrane resistance investigation of changing conditions in time at two membrane bioreactors, and the big more expression film pollution of membrane resistance climbing speed development is fast more.One is the conventional film bio-reactor two that does not add the ozonization system for one, one of the membrane bioreactor that adds the ozonization system shown in Figure 1.
Sludge concentration MLSS (mixed liquor suspended solid, mixed liquor suspended solid, MLSS concentration) is all above 7g/L in the mixed solution in two reactors, and the supernatant liquor organic concentration is too high above 50mg/L, and the strainability of mixed solution is relatively poor.In reactor one, sludge circulation pump is pumped to 1/5 mud mixed liquid in the membrane bioreactor that to carry out dosage in the ozone reaction pond be 120mgO
3The mixed solution oxidation break process of/g-SS ozone is back to by recycle pump and carries out the bio-aeration DeR in the reactor.The hydraulic detention time that circulating sludge is set guaranteed can be fully utilized by the cell that disintegrates after the broken oxidation of ozone greater than 3 hours.
Found that the membrane resistance climbing speed is 3.5 * 10 in the reactor one
10m
-1/ min is than membrane resistance climbing speed 4.5 * 10 in the reactor two
10m
-1/ min reduces more than 20%.Prove that the effect of ozone on mixed under this condition can control the tempo of membrane pollution of membrane bioreactor.
Embodiment two
Present embodiment under the mud mixed liquid cycling condition that embodiment one describes, with 100,200,300mg O
3The different dosages processing of/g-SS sludge concentration is that the situation of 8g/L left and right sides mixed solution is investigated.The results are shown in shown in the following table:
Resistance climbing speed k (10
10m
-1/ min)
Ozone dosage (mg O
3/ g-SS) do not adopt ozonize to adopt ozonize
100 6.1 6.0
200 5.5 3.2
300 6.0 3.5
Found that dosage 100mg O
3During/g-SS, the membrane resistance climbing speed of two reactors is more or less the same.Explanation is under this dosage, and the effect of ozone on mixed does not almost have effect to the control that film pollutes.But 200,300mg O
3Ozonization descends more than 35% and 40% the membrane resistance climbing speed respectively under/the g-SS dosage.Prove that the effect of ozone on mixed under this condition can control the tempo of membrane pollution of membrane bioreactor.
Embodiment three
Present embodiment is under the mud mixed liquid cycling condition that embodiment one describes, with 120mg O
3It is 2,4,8 that the different dosages of/g-SS are handled sludge concentration, and the situation of 20g/L mixed solution is investigated.The results are shown in shown in the following table:
Resistance climbing speed k (10
10m
-1/ min)
Sludge concentration MLSS (g/L) does not adopt ozonize to adopt ozonize
2 8.1 8.9
4 4.5 4.2
8 5.6 3.5
20 243.8 14.7
Found that when sludge concentration is low to moderate 2g/L the development aggravation that the processing of ozone makes film pollute on the contrary.But under the normal running (operation) conditions (more than the sludge concentration 4g/L) of membrane bioreactor, 120mg O
3The ozonize of/g-SS dosage can play the effect of decelerating membrane pollution.Even in sludge concentration during up to 20g/L, the resistance climbing speed can reduce more than 90%.
Embodiment four
Fig. 2 represents the film bioreactor device of the ozone regulation and control mixed solution of embodiment four, and this installs by ozonizer 1, biological reaction tank 2, and membrane module 3 goes out water pump 4, aerator 5, ozone tail gas cuvette 6 compositions such as grade.According to the conventional film bio-reactor, this device has increased ozone generating-device and need carry out the absorption of ozone tail gas to reactor.
The structure of present embodiment is described in detail as follows in conjunction with Fig. 2:
In the permanent flux operation of membrane bioreactor, under the sludge concentration 8g/L condition, when operation is initial, the whole mixed solutions in the reactor is carried out dosage be respectively 0,0.1,1mg O
3The ozonize of/g-SS.
Fig. 3 has shown both sides differential pressure of membrane (Trans-membrane Pressure, TMP) curve over time.Can find out obviously that from figure ozonization can improve the membrane filtration of mixed solution, the TMP climbing speed is diminished.Can see that simultaneously different ozone dosage improves the effect difference for the mixed solution strainability.Under above-mentioned three dosages, the mean drag climbing speed is respectively 24,7.4, and 8.6 * 10
10m
-1/ min.Under low dosage condition, small amounts of cells that ozonization causes part larger molecular organics broken and that the outer polymer of born of the same parents is discharged can also be brought into play the effect of biological flocculant, and the colloid in the mixed solution is become floc particle, makes that grain graininess becomes greatly in the mixed solution.
If whole mixed solutions are carried out high dosage ozonize, find that dosage is at 80mg O
3When/g-SS is above, whole mixed solutions is handled the generation and the development that can aggravate the film pollution, this is because cytoclasis has produced a large amount of dissolved organic matter matter and caused.Therefore, use the ozonize of high dosage necessary only at partially mixed liquid, and making it to carry out aeration with mixed solution without ozonize mixes, Control Circulation mixed solution hydraulic detention time is more than 3 hours, the organism that cytoclasis is produced absorbs for the abundant metabolism of other microorganisms, as described in embodiment one.When dosage at 1～80mg O
3In the time of in/g-SS the scope, ozonize is not remarkable to the influence that film pollutes tempo.
When this embodiment of evidence chose the low-ozone dosage, dissolved organic matter content was effectively reduced in the membrane bioreactor mixed solution, membrane filtration be improved significantly.
Claims (2)
1. mixed liquor characteristics regulate and control method in a kind of membrane bioreactor of polluting of controlling diaphragm, this method using ozone technology is handled the mixed solution in the membrane bioreactor, thus controlling diaphragm pollutes, and keeps its steady running, and concrete measure is as follows:
Utilize ozonizer to produce ozone, not to be higher than 1mg O
3The ozone dosage of/g-SS focuses on the mixed solution in the described membrane bioreactor; Perhaps the partially mixed liquid in the described membrane bioreactor is pumped in the ozone reaction pond, utilizes dosage to be higher than 100mg O by 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 described membrane bioreactor and mixes with former mixed solution.
2. mixed liquor characteristics regulate and control method according to claim 1 is characterized in that: described membrane bioreactor is to have the integral type of suspension type active sludge biological reaction member or the membrane bioreactor of separated type.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100096246A CN1274612C (en) | 2004-09-30 | 2004-09-30 | Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100096246A CN1274612C (en) | 2004-09-30 | 2004-09-30 | Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution |
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| Publication Number | Publication Date |
|---|---|
| CN1600705A true CN1600705A (en) | 2005-03-30 |
| CN1274612C CN1274612C (en) | 2006-09-13 |
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1326597C (en) * | 2005-05-27 | 2007-07-18 | 清华大学 | Process for on-line controlling film pollution development by altrasonic wave |
| CN100400441C (en) * | 2005-06-14 | 2008-07-09 | 华南理工大学 | Process for combined water treatment of chemical oxidizing-biological biological filtering tank |
| CN101200331B (en) * | 2006-10-12 | 2011-09-28 | 北京碧水源科技股份有限公司 | Method for producing reclaimed water by membrane bioreactor-ozone combination technique |
| WO2013000115A1 (en) * | 2011-06-28 | 2013-01-03 | Linde Aktiengesellschaft | Ozone treatment of wastewater |
| CN104609668A (en) * | 2015-01-23 | 2015-05-13 | 先达恩那社水处理工程（天津）有限公司 | Wastewater treatment method for chip production line |
| CN106745701A (en) * | 2016-11-30 | 2017-05-31 | 华电水务工程有限公司 | Using the method and reaction unit of Membrane Bioreactor for Wastewater Treatment organic wastewater |
| CN110054287A (en) * | 2019-05-13 | 2019-07-26 | 北京化工大学 | A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique |
-
2004
- 2004-09-30 CN CNB2004100096246A patent/CN1274612C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1326597C (en) * | 2005-05-27 | 2007-07-18 | 清华大学 | Process for on-line controlling film pollution development by altrasonic wave |
| CN100400441C (en) * | 2005-06-14 | 2008-07-09 | 华南理工大学 | Process for combined water treatment of chemical oxidizing-biological biological filtering tank |
| CN101200331B (en) * | 2006-10-12 | 2011-09-28 | 北京碧水源科技股份有限公司 | Method for producing reclaimed water by membrane bioreactor-ozone combination technique |
| WO2013000115A1 (en) * | 2011-06-28 | 2013-01-03 | Linde Aktiengesellschaft | Ozone treatment of wastewater |
| CN104609668A (en) * | 2015-01-23 | 2015-05-13 | 先达恩那社水处理工程（天津）有限公司 | Wastewater treatment method for chip production line |
| CN106745701A (en) * | 2016-11-30 | 2017-05-31 | 华电水务工程有限公司 | Using the method and reaction unit of Membrane Bioreactor for Wastewater Treatment organic wastewater |
| CN110054287A (en) * | 2019-05-13 | 2019-07-26 | 北京化工大学 | A method of passing through control mixed liquor characteristics decelerating membrane pollution in SNAD technique |
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| Publication number | Publication date |
|---|---|
| CN1274612C (en) | 2006-09-13 |
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