臭氧-活性炭技术对膜生物反应器膜污染减缓研究
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摘要
本研究目的是探讨臭氧-活性炭技术对膜生物反应器(membrane bioreactor,MBR)膜污染减缓的影响。通过短期批式实验表明,粉末活性炭(power activated carbon,PAC)可强化臭氧的氧化效果,臭氧投加量超过0.25mg/(gSS)将恶化污泥混合液可滤性;对滤出液残余臭氧浓度检测表明,PAC的加入有利于维持本体溶液臭氧浓度。臭氧-活性炭技术引入MBR系统有助于膜污染的减缓,反应器内微生物活性受到一定的抑制作用,但对MBR出水水质影响较小;臭氧-活性炭减小了反应器内溶解性微生物产物(soluble microbial products,SMP)中的蛋白质及多聚糖含量,显著降低了污泥絮体中松散的胞外聚合物(loosely bound EPS,LB)及胞外聚合物(extracellular polymeric substances,EPS)中蛋白质浓度,以上结果表明应用臭氧-活性炭技术来延缓MBR膜污染是可行的。
This study was aiming at investigating the effects of ozonation-activated carbon technology on membrane fouling mitigation in membrane bioreactor(MBR).The results from the short-term experiment showed that power activated carbon(PAC) would improve the efficiency of ozone.When the ozone dosage was more than 0.25 mg/(gSS),the filterability of mixed liquor would deteriorate.Analysis of residual ozone in the effluent indicated that PAC would benefit to maintain the constant ozone concentration in the bulk solution.The introduction of ozonation-activated carbon technology into the MBR system would be beneficial to the system because membrane fouling could be controlled in long-term experiment.The microbial activity was somewhat inhibited,however,the effluent quality of the system was affected at a minimal level.Ozonation-activated carbon could reduce the protein and carbohydrate fractions in the soluble microbial products(SMP).The amount of loosely bound extracellular polymeric substances(LB) and the protein fractions in extracellular polymeric substances(EPS) were also decreased obviously by ozonation-activated carbon technology.These findings indicated the feasibility of using ozonation-activated carbon technology to control MBR membrane fouling.
This study was aiming at investigating the effects of ozonation-activated carbon technology on membrane fouling mitigation in membrane bioreactor(MBR).The results from the short-term experiment showed that power activated carbon(PAC) would improve the efficiency of ozone.When the ozone dosage was more than 0.25 mg/(gSS),the filterability of mixed liquor would deteriorate.Analysis of residual ozone in the effluent indicated that PAC would benefit to maintain the constant ozone concentration in the bulk solution.The introduction of ozonation-activated carbon technology into the MBR system would be beneficial to the system because membrane fouling could be controlled in long-term experiment.The microbial activity was somewhat inhibited,however,the effluent quality of the system was affected at a minimal level.Ozonation-activated carbon could reduce the protein and carbohydrate fractions in the soluble microbial products(SMP).The amount of loosely bound extracellular polymeric substances(LB) and the protein fractions in extracellular polymeric substances(EPS) were also decreased obviously by ozonation-activated carbon technology.These findings indicated the feasibility of using ozonation-activated carbon technology to control MBR membrane fouling.
引文
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[11]Satyawalia Y,Balakrishnan M.Effect of PAC addition on sludgeproperties in an MBR treating high strength wastewater[J].WaterRes.,2009,43(6):1577-1588.
[12]张海丰,张再兴,张兰河.无排泥条件下膜生物反应器污泥混合液可滤性分析[J].化工进展,2011,30(12):2775-2779.
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[15]中华人民共和国城镇建设部.CJ/T3028.2—94,臭氧发生器臭氧浓度、产量、电耗的测量[S].北京:清华大学环境工程系.
[16]刘阳,张捍民,杨凤林.活性污泥中微生物胞外聚合物(EPS)影响膜污染机理研究[J].高校化学工程学报,2008,22(2):332-338.
[17]周春生,尹军.TTC-脱氢酶活性检测方法的研究[J].环境科学学报,1996,16(4):400-404.
[18]Christine Warta.The Effect of molecular oxygen on the activatedcarbon adsorption of natural organic matter in river water[J].WaterRes.,1995,29(2):55-562.
[19]舒诗湖,严敏,苏定江,等.臭氧-生物活性炭对有机物分子量分布的影响[J].中国环境科学,2007,27(5):638-641
[20]Zhao Y,Gu P.Effect of powdered activated carbon dosage onretarding membrane fouling in MBR[J].Sep.Purif.Technol.,2006,52(1):154-160.
[2]Meng F,Zhang H,Yang F,et al.Effect of filamentous bacteria onmembrane fouling in submerged membrane bioreactor[J].J.Membr.Sci.,2006,272(1-2):161-168.
[3]张海丰,杨震,张冲,等.金属离子对膜生物反应器混合液可滤性影响研究进展[J].化工进展,2010,29(11):2171-2176.
[4]Kimura K,Yamato N,Yamamura H,et al.Membrane fouling inpilot-scale membrane bioreactors(MBRs)treating municipalwastewater[J].Environ.Sci.Technol.,2005,39(16):6293-6299.
[5]Wu J,Huang X.Use of ozonation to mitigate fouling in a long-termmembrane bioreactor[J].Bioresource Technology,2010,101(15):6019-6027.
[6]Sun F,Wang X,Li X.Effect of biopolymer clusters on the foulingproperty of sludge from a membrane bioreactor(MBR)and itscontrol by ozonation[J].Process Biochem.,2011,46(1):162-167.
[7]Hwang B,Kim J,Ahn C,et al.Effect of disintegrated sludgerecycling on membrane permeability in a membrane bioreactorcombined with a turbulent jet flow ozone contactor[J].Water Res.,2010,44(6):1833-1840.
[8]Remy M,Potier V,Temmink H,et al.Why low powdered activatedcarbon addition reduces membrane fouling in MBRs[J].Water Res.,2010,44(3):861-867.
[9]Tsai H,Ravindran V,Pirbazari M.Model for predicting theperformance of membrane bioadsorber reactor process in watertreatment applications[J].Chemical Engineering Science,2005,60(20):5620-5636.
[10]李绍峰,高元.PAC影响MBR污泥混合液特性及膜污染研究[J].环境科学,2011,32(2):508-514.
[11]Satyawalia Y,Balakrishnan M.Effect of PAC addition on sludgeproperties in an MBR treating high strength wastewater[J].WaterRes.,2009,43(6):1577-1588.
[12]张海丰,张再兴,张兰河.无排泥条件下膜生物反应器污泥混合液可滤性分析[J].化工进展,2011,30(12):2775-2779.
[13]国家环境保护总局.水和废水监测分析方法[M].第4版.北京:中国环境科学出版社,2002.
[14]Le-Clech P,Vicki C,Tony A G.Fouling in membrane bioreactorsused in wastewater treatment[J].J.Membr.Sci.,2006,284(1-2):17-53.
[15]中华人民共和国城镇建设部.CJ/T3028.2—94,臭氧发生器臭氧浓度、产量、电耗的测量[S].北京:清华大学环境工程系.
[16]刘阳,张捍民,杨凤林.活性污泥中微生物胞外聚合物(EPS)影响膜污染机理研究[J].高校化学工程学报,2008,22(2):332-338.
[17]周春生,尹军.TTC-脱氢酶活性检测方法的研究[J].环境科学学报,1996,16(4):400-404.
[18]Christine Warta.The Effect of molecular oxygen on the activatedcarbon adsorption of natural organic matter in river water[J].WaterRes.,1995,29(2):55-562.
[19]舒诗湖,严敏,苏定江,等.臭氧-生物活性炭对有机物分子量分布的影响[J].中国环境科学,2007,27(5):638-641
[20]Zhao Y,Gu P.Effect of powdered activated carbon dosage onretarding membrane fouling in MBR[J].Sep.Purif.Technol.,2006,52(1):154-160.