CN102491493A - Method for alleviating membrane fouling in membrane bioreactor (MBR) - Google Patents
Method for alleviating membrane fouling in membrane bioreactor (MBR) Download PDFInfo
- Publication number
- CN102491493A CN102491493A CN2011103687036A CN201110368703A CN102491493A CN 102491493 A CN102491493 A CN 102491493A CN 2011103687036 A CN2011103687036 A CN 2011103687036A CN 201110368703 A CN201110368703 A CN 201110368703A CN 102491493 A CN102491493 A CN 102491493A
- Authority
- CN
- China
- Prior art keywords
- water
- membrane
- membrane bioreactor
- mbr
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method for alleviating membrane fouling in a membrane bioreactor. The method is characterized in that adding of a water-soluble calcium compound into treatment water is realized in inflow water before the water enters the membrane bioreactor, with the compound added at a concentration of 30-200mg/L in terms of calcium ions. The method of the invention reserves the advantage of membrane fouling in MBR technologies of prior art by adding a water-soluble calcium compound to reduce the EPS (extracellular polymeric substance) content in a sludge mixed solution and change properties of an EPS. In addition, as the calcium compound is added into the inflowing water outside the membrane bioreactor, negative effects caused by adding into a mixed solution can be reduced, thus really reaching alleviating membrane fouling, prolonging the service life of a membrane, and lowering the operation cost of a MBR.
Description
Technical field
The present invention relates to a kind of alleviate the submerged membrane bio-reactor (Membrane Bioreactor, MBR) in film pollute the method for (Membrane Fouling), especially a kind ofly alleviate the method that film pollutes through in the water inlet of MBR technology, adding calcium ion.
Background technology
MBR is the sewage treatment technique that a kind of membrane sepn combines with biotechnology, has characteristics such as floor space is little, surplus sludge volume is few, stable effluent quality, in industrial and municipal wastewater processing, reuse of wastewater, progressively gets the nod in recent years.And restrict its large-scale practical application mainly is membrane pollution problem, and the film pollution is a MBR inevitable phenomenon in service.Film pollutes quite big to the influence of film properties, and with untainted film ratio, membrane flux can reduce 20-40%, can make flux descend more than 80% when seriously polluted.Film pollutes and not only reduces the performance of film, and has shortened the work-ing life of film.
At present, the measure that film pollutes among the control MBR mainly comprises the following aspects: improve mud mixed liquid character or to water inlet carry out pre-treatment, film modification or development of new pollution-resistant membrane, operational condition and the polluted membrane optimized among the MBR clean or the like.Wherein, there are problems such as process complicacy, cost height in the film modification technology, and the exploitation of novel anti polluted membrane needs the regular hour, and has not intellectual, does not still conform at present to be suitable for the heavy industrialization application.Improve aeration intensity in the operational condition; Though can slow down the deposition of mud granule on the film surface, high aeration intensity causes high cross-flow rate, the shearing force effect of its generation makes mud granule become tiny; With the chance that increases fenestra absorption and stop up, the aggravation film pollutes; In addition, high aeration intensity also can increase running cost.
In the MBR technology film pollute main relevant with three factors of operational condition with the character of mud mixed liquid character, film, mud mixed liquid character having the greatest impact wherein to the film pollution.There are some researches show; Microbial metabolites-extracellular polymeric in the mud mixed liquid (EPS) can be deposited on face and form gel coat; The formation of gel coat has not only increased the organic contamination of face; Also can change the physico-chemical property (for example electric charge and hydrophobicity etc.) of face, promote the adhesion of mikrobe at face, thus the biological pollution of aggravation face.Therefore, have the EPS content in the mud mixed liquid high more, film pollutes more serious phenomenon.
Floc size distribution in a membrane bioreactor and consequences for membrane fouling. Colloids and Surfaces A:Physicochemical and Engineering Aspects; 1998; 138 (2-3): 403 ~ 411 reports: in membrane filtration processes; The mud cake that forms than big flocculating body has porousness and perviousness, can reduce the obstruction fenestra, pollutes thereby alleviate film.Comparison of bacterial extracellular polymer extraction methods. Applied and Environmental Microbiology, 1980,40 (2): 179-185; Extraction of extracellular polymers from activated sludge using a cation exchange resin.. Water Research, 1996,30 (8): 1749-1758; Activated sludge surfaces in relation to the sludge volume index. Water Research, 1971,5 (10): 861-870; Purification and characterization of extracellular polysaccharide from activated sludge. Water Research; 1986; 20 (11): 1427-1432, report can take place to build bridge with the electronegative functional group in EPS surface and adhesive attraction (changing mud mixed liquid character) through in sewage, going into calcium/aluminum ion; Thereby enhanced biological throwing out; The flco that helps greater particle size forms, and increases the cake layer compressibility, pollutes thereby alleviate film.
Existing big quantity research shows, people's excess intake aluminum ion can influence baby's bone and neurodevelopment, is prone to cause senile dementia, also is prone to make the people cross presenility; Aluminium also can suppress the absorption of phosphorus in addition, disturbs normal alcium and phosphor metabolization in the body, causes osteoporosis, fracture etc.Add aluminium and left and can make that aluminium composition exceeds standard in the water, enter water body and can make that aluminium exceeds standard in the water, this is undesirable.
In the MBR reactor drum, add calcium ion; Cause mixed solution local Ca ionic concn too high; There are some researches show (identification of membrane pollution of membrane bioreactor behavior and sign [D]. Liaoning: Dalian University of Technology; 2007): when calcium ion concn is higher, the calcium ion that exists with the The dissolved form can with the CO that decomposes in the water
3 2-Deng negatively charged ion generation chemical reaction, form small and dense real inorganic small-particle (like CaCO
3).And in membrane filtration processes, these small-particles more are prone to stop up fenestra, pollute thereby can increase the weight of film, and reduction or counteracting add calcium ion and alleviate the effect that film pollutes.
In addition, have research also to show, add as medicament with Calcium Chloride Powder Anhydrous if add calcium ion, Calcium Chloride Powder Anhydrous heat release meeting when dissolving produces a large amount of heats, will produce certain influence to the microorganism active in the mixed solution, can reduce treatment effect.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, provides a kind of adding calcium ion can alleviate film and pollutes, and can overcome the method that alleviates film pollution in the membrane bioreactor of the shortcoming of himself bringing simultaneously again.
The object of the invention realizes; Mainly improving is to change calcium ion to add location point, by in MBR reactor drum (mud mixed liquid), adding originally, changes adding in MBR reactor drum pre-treatment water inlet into; Reach and both help alleviating the film pollution; Can make again calcium ion to microorganism active and be prone to form the inorganic short grained influence of small and dense reality drop to minimum, thereby overcome the deficiency of prior art, realize the object of the invention.Specifically; The present invention alleviates the method that film pollutes in the membrane bioreactor; Comprise in treating water, adding water-soluble calcium compound that it is characterized in that it is in the water inlet before membrane bioreactor that said water-soluble calcium compound adds, add-on is counted 30-200 mg/L with calcium ion.
Before detailed description, earlier do an introduction, so that those skilled in the art have one clearly to understand to this patent general plotting technical scheme and the basic fundamental effect that reaches through the basic function and the effect that can reach to invention.
The present invention will be owing to will add and can take place to build bridge and adhere to EPS in the mud mixed liquid; The calcium ion of enhanced biological throwing out; Change in the preceding water inlet of membrane bioreactor and add; Not only kept and in treating water, added calcium ion formation greater particle size flco, increased the cake layer compressibility, alleviated film and pollute advantage; And in handling water inlet, add (rather than adding in the mud mixed liquid in the reactor drum), its dissolving produces heat and before sewage gets into membrane bioreactor, consumes rapidly, thereby can not exert an influence to microorganism active in the mixed solution because of exothermic dissolution produces heat; Simultaneously; Organism is still undecomposed in the water at this moment, and pollutent still exists with molecularity, after the blending ca ion gets into membrane bioreactor; Though organism decomposes in the water at this moment, can produce CO
3 2-Deng negatively charged ion, but since calcium ion get among the MBR with sewage, and with the mud mixed liquid thorough mixing, the calcium ion of this moment because of with membrane bioreactor in the EPS that exists take place to build bridge and adhesive attraction, and reduced and CO
3 2-Deng negatively charged ion generation chemical reaction, thereby form small and dense real inorganic small-particle and significantly reduce, also just can not pollute and constitute a threat to film.Calcium ion is built bridge and adhesive attraction, is adsorbed onto the polysaccharose substance among the EPS in the mating type extracellular polymeric (LB-EPS) on the one hand, has reduced EPS content in the mud mixed liquid, alleviates film and pollutes; Bridge formation and adhesive attraction can increase the median size of mud granule on the other hand, make the mud cake of formation have porousness, perviousness, thereby keep higher membrane flux.
The existing MBR technology of the present invention adds the location point difference except that changing water-soluble calcium compound, and all the other all same prior aries for example add concentration amounts, MBR technology controlling and process or the like, and just not narration separately one by one, this is clearly to those skilled in the art.
Add water-soluble calcium compound; Mainly be in water, to dissolve after adding to form calcium ion; Can in water, dissolve the water-soluble calcium compound that can produce calcium ion in theory can use; But be applied to water treatment, the water-soluble calcium compound that other pair ion water that should select good economy performance and adding back to form do not produce secondary pollution is better, for example Calcium Chloride Powder Anhydrous.
The present invention alleviates the method that film pollutes in the membrane bioreactor, with respect to prior art, has both kept prior art MBR technology and has added water-soluble calcium compound; Reduce EPS content in the mud mixed liquid, and change EPS character, reach and alleviate the advantage that film pollutes; Be in the water inlet outside membrane bioreactor because of calcium cpd adds again, make before sewage gets into membrane bioreactor, to be eliminated in the dissolution process heat release, thereby can be to microorganisms influence in the membrane bioreactor; Secondly, add the back and form high concentration calcium ion, after getting into membrane bioreactor; The EPS that exists in itself and the membrane bioreactor takes place to build bridge and adhesive attraction, is better than and CO
3 2-Deng negatively charged ion generation chemical reaction, reduced and CO
3 2-Generate the inorganic small-particle amount of small and dense reality Deng negatively charged ion generation chemical reaction, thereby reduced the negative effect that adds calcium ion, really reach and to alleviate film and pollute, prolong film work-ing life, reduce MBR running cost.Test water quality and operational conditions: COD 306 ~ 326 mg/L that dispose of sewage, NH
3-N 27 ~ 30 mg/L.Add Calcium Chloride Powder Anhydrous in the water inlet and count 30-200 mg/L with calcium ion, adopt permanent flux operator scheme, the aeration GWR is 50:1, and the pH value is 6.8 ~ 7.2, and temperature is 24 ~ 28 ℃, SRT (sludge retention time) 15 d, and membrane flux is 18 L/ (m during steady running
2H), going out water pump takes out and stops than being 10 min:2 min.COD clearance 93% ~ 100%, NH
3-N clearance 88% ~ 100%, sludge concentration are 3.3 ~ 4.0 g/L, and the mud granule median size is 134 ~ 177 μ m, and LB-EPS content is 1.3 ~ 2.2 mg/ (gVSS), and filtering total-resistance is 1.74 * 10
12~ 7.49 * 10
121/m, reversible filtration resistance are 1.1 * 10
12~ 5.19 * 10
121/m, irreversible filtration resistance are 0.11 * 10
12~ 1.8 * 10
121/m, transmembrane pressure (TMP) average increment speed is 0.77 ~ 2.95 kPa/d.Compare with in membrane bioreactor, adding, EPS content reduces by 20%, and the mud granule median size increases by 16%, and TMP average increment speed reduces by 30%, alleviates film and pollutes deleterious impact thereby effectively alleviate.This method; Therefore be used for waste water such as bone processing waste water, citric acid wastewater and percolate, contain higher calcium ion in type waste water, with add aluminum salt with the iron(ic)chloride flocculation agent processing compare; Can reduce the cost that MBR handles this type of waste water greatly, and prolong the work-ing life of film.
Below in conjunction with several specific embodiments, essence of the present invention is further understood in exemplary illustration and help, but the embodiment detail only is for the present invention is described; Do not represent the present invention to conceive whole technical schemes down; Therefore should not be construed as the technical scheme qualification total to the present invention, some are In the view of the technician, and the unsubstantiality that does not depart from the present invention's design increases and/or change; For example simple the change or replacement of technical characterictic to have same or similar technique effect all belongs to protection domain of the present invention.
Embodiment
Embodiment 1: certain Yuan Shui of sewage work, COD 313 mg/L, NH
3-N 27 mg/L.Membrane bioreactor SRT is 15 d, and the aeration GWR is 50:1, and the pH value is 6.8, and temperature is 24 ℃, and reactor drum adopts permanent flux operator scheme, and membrane flux is 18 L/ (m
2H), going out taking out of water pump stops than being 10 min:2 min.Add Calcium Chloride Powder Anhydrous (counting 30 mg/L) in the water inlet before the reactor drum with calcium ion.After moving 10 d, the COD clearance is 97%, NH
3-N clearance is 96%; Sludge concentration is 5.9 g/L, and the mud granule volume average particle size is 164 μ m, and LB-EPS content is 2.21mg/ (gVSS); Filtering total-resistance is 5.49 * 10
121/m, reversible filtration resistance are 1.19 * 10
121/m, irreversible filtration resistance are 0.92 * 10
121/m; The average increment speed of TMP is 2.95 kPa/d.
Embodiment 2: certain Yuan Shui of sewage work, water inlet COD 326 mg/L, NH
3-N 30 mg/L; Membrane bioreactor SRT is 15 d, and the aeration GWR is 50:1, and the pH value is 7.1, and temperature is 26 ℃, and reactor drum adopts permanent flux operator scheme, and membrane flux is 18 L/ (m
2H), go out water pump and take out and stop, add Calcium Chloride Powder Anhydrous (with calcium from counting 100 mg/L) in the water inlet than being 10 min:2 min.After moving 10 d, COD clearance 97%, NH
3-N clearance 90%; Sludge concentration 6.2g/L, mud granule volume average particle size 177 μ m, content 2.82 mg/ (gVSS) of LB-EPS; Filtering total-resistance is 6.22 * 10
121/m, reversible filtration resistance are 1.10 * 10
121/m, irreversible filtration resistance 1.10 * 10
121/m; The average increment speed of TMP is 1.87 kPa/d.
Embodiment 3: certain Yuan Shui of sewage work, water inlet COD 306 mg/L, NH
3-N 28 mg/L; Membrane bioreactor SRT is 15 d, and the aeration GWR is 50:1, and the pH value is 7.2, and temperature is 28 ℃, and reactor drum adopts permanent flux operator scheme, and membrane flux is 18 L/ (m
2H), go out water pump and take out and stop, add Calcium Chloride Powder Anhydrous (with calcium from counting 200 mg/L) in the water inlet than being 10 min:2 min.After moving 10 d, COD clearance 97%, NH
3-N clearance 88%; Sludge concentration 6.2g/L, mud granule volume average particle size 172 μ m, LB-EPS content are 3.21mg/ (gVSS); Filter total-resistance 7.74 * 10
121/m, reversible filtration resistance are 1.13 * 10
121/m, irreversible filtration resistance 1.84 * 10
121/m; The average increment speed of TMP is 1.68 kPa/d.
In addition, in the test of different concns sewage, also show above-mentioned similar effect.
Relatively: routine 1 sewage, do not add calcium ion, other operational condition is identical with routine 1, move 10 d after, COD clearance 97%, NH
3-N clearance 96%; Average increment speed 3.60 kPa/d of TMP, film pollute and cause example 1 increase by 18% of TMP.
To those skilled in the art, under this patent design and specific embodiment enlightenment, some distortion that can directly derive or associate from this patent disclosure and general knowledge; Those of ordinary skills will recognize also can adopt additive method, or uses substituting of known technology in the prior art always, and the equivalence of characteristic changes or modification; Mutual various combination between characteristic for example adopts other water-soluble calcium compound, or the like unsubstantiality change; Can be employed equally; Can both realize this patent representation function and effect, launch for example no longer one by one to describe in detail, all belong to this patent protection domain.
Claims (2)
1. alleviate the method that film pollutes in the membrane bioreactor, comprise in treating water, adding water-soluble calcium compound, it is characterized in that it is that add-on is counted 30-200mg/L with calcium ion in the water inlet before membrane bioreactor that said water-soluble calcium compound adds.
2. according to the said method that alleviates film pollution in the membrane bioreactor of claim 1, it is characterized in that water-soluble calcium compound is a Calcium Chloride Powder Anhydrous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103687036A CN102491493A (en) | 2011-11-20 | 2011-11-20 | Method for alleviating membrane fouling in membrane bioreactor (MBR) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103687036A CN102491493A (en) | 2011-11-20 | 2011-11-20 | Method for alleviating membrane fouling in membrane bioreactor (MBR) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102491493A true CN102491493A (en) | 2012-06-13 |
Family
ID=46183364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103687036A Pending CN102491493A (en) | 2011-11-20 | 2011-11-20 | Method for alleviating membrane fouling in membrane bioreactor (MBR) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102491493A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863124A (en) * | 2012-09-29 | 2013-01-09 | 江南大学 | Method for printing and dyeing wastewater deep treatment by chemically enhancing MBR (membrane bioreactor) depth |
| CN103241830A (en) * | 2013-05-30 | 2013-08-14 | 南开大学 | Comprehensive control method of MBR (Membrane Biological Reactor) membrane biological pollution |
| CN107381730A (en) * | 2017-09-04 | 2017-11-24 | 河海大学 | A kind of method for slowing down fouling membrane in membrane capacitance deionization system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480410A (en) * | 2003-07-18 | 2004-03-10 | 天津大学 | Flocculation method for prevemting membrane from pollution and maintaining flux of membrane |
| JP2005046762A (en) * | 2003-07-30 | 2005-02-24 | Japan Organo Co Ltd | Water treatment method and water treatment apparatus |
| CN1974439A (en) * | 2006-12-07 | 2007-06-06 | 江南大学 | Method of inhibiting membrane contamination of membrane bioreactor |
| CN101511739A (en) * | 2006-09-13 | 2009-08-19 | 纳尔科公司 | A method of improving membrane bioreactor performance |
-
2011
- 2011-11-20 CN CN2011103687036A patent/CN102491493A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480410A (en) * | 2003-07-18 | 2004-03-10 | 天津大学 | Flocculation method for prevemting membrane from pollution and maintaining flux of membrane |
| JP2005046762A (en) * | 2003-07-30 | 2005-02-24 | Japan Organo Co Ltd | Water treatment method and water treatment apparatus |
| CN101511739A (en) * | 2006-09-13 | 2009-08-19 | 纳尔科公司 | A method of improving membrane bioreactor performance |
| CN1974439A (en) * | 2006-12-07 | 2007-06-06 | 江南大学 | Method of inhibiting membrane contamination of membrane bioreactor |
Non-Patent Citations (3)
| Title |
|---|
| IN S. KIM,NAMJUNG JANG: "The effect of calcium on the membrane biofouling in the membrane bioreactor (MBR)", 《WATER RESEARCH》 * |
| SARA ARABI,GEORGE NAKHLA: "Impact of calcium on the membrane fouling in membrane bioreactors", 《JOURNAL OF MEMBRANE SCIENCE》 * |
| 夏杰: "投加PAC和钙离子延缓膜污染机理研究", 《中国优秀硕士学位论文全文数据库(工程科技Ⅰ辑)》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863124A (en) * | 2012-09-29 | 2013-01-09 | 江南大学 | Method for printing and dyeing wastewater deep treatment by chemically enhancing MBR (membrane bioreactor) depth |
| CN103241830A (en) * | 2013-05-30 | 2013-08-14 | 南开大学 | Comprehensive control method of MBR (Membrane Biological Reactor) membrane biological pollution |
| CN107381730A (en) * | 2017-09-04 | 2017-11-24 | 河海大学 | A kind of method for slowing down fouling membrane in membrane capacitance deionization system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Omwene et al. | Phosphorus removal from domestic wastewater in electrocoagulation reactor using aluminium and iron plate hybrid anodes | |
| Giwa et al. | Membrane bioreactors and electrochemical processes for treatment of wastewaters containing heavy metal ions, organics, micropollutants and dyes: recent developments | |
| Giwa et al. | Enhanced sludge properties and distribution study of sludge components in electrically-enhanced membrane bioreactor | |
| Bani-Melhem et al. | Development of a novel submerged membrane electro-bioreactor (SMEBR): performance for fouling reduction | |
| CN103304054B (en) | A kind for the treatment of process of dyeing waste water | |
| CN104445550B (en) | A kind of preparation method of heavy metal-polluted water treatment agent | |
| CN102976458A (en) | Compound refined diatomite sewage dephosphorization agent | |
| CN102329048B (en) | Method for treating wastewater produced during chemical synthesis of vitamin B6 | |
| CN108191020A (en) | A kind of novel liquid complexing nano flocculant preparation method | |
| CN108059225B (en) | Titanium gel-poly dimethyl diallyl ammonium chloride composite coagulant and application thereof | |
| Sun et al. | Effects of epichlorohydrin–dimethylamine on coagulation and membrane performance of ferric chloride in coagulation–ultrafiltration hybrid process | |
| CN102976537B (en) | Comprehensive physical and chemical treatment device and method of organic silicon wastewater | |
| CN102491493A (en) | Method for alleviating membrane fouling in membrane bioreactor (MBR) | |
| CN105060411A (en) | Internal electrolysis-electric flocculation method for processing phosphor-containing wastewater | |
| JP2010247057A (en) | Water purification method combining fine particle-making method and membrane separation method | |
| CN102633335B (en) | Sewage treatment method | |
| CN104402070A (en) | Heavy metal-containing wastewater treatment chemical | |
| CN104230108A (en) | Method for treating glass fiber production wastewater | |
| CN102491505A (en) | Method for mitigating membrane fouling in membrane bioreactor | |
| CN110357393A (en) | A kind of nano flocculant and preparation method for sludge settling | |
| CN204824514U (en) | A device for sewage treatment | |
| CN102936073A (en) | Method for preparing polymer solution by using oil field sewage | |
| CN110577254A (en) | water purifying agent for coal chemical industry, coking chemical industry and other chemical industries and preparation method thereof | |
| CN111072116A (en) | Composite inorganic high polymer iron-based flocculant and preparation and application thereof | |
| CN104386790A (en) | Wastewater treatment reagent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120613 |