SMP形成与降解机制分析及其对MBR膜过滤的影响
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2020-04-07 17:50:33
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第64卷第8期2013年8月化工学报CIESCJourna1Vo1.64NO.8August2013SMP形成与降解机制分析及其对MBR膜过滤的影响郗丽娟,吕娜,张海丰,孙宝盛。(东北电力大学化工学院,吉林省吉林市132012;天津大学环境科学与工程学院,天津300072)摘要:以膜生物反应器(membranebioreactor,MBR)中活性污泥为研究对象,考察了溶解性微生物代谢产物(solublemicrobialproduct,SMP)的形成及降解机制,并探讨了SMP对膜过滤的影响。实验结果表明,在基质存在时反应器内的SMP主要以基质利用相关型产物(utilizationassociatedproducts,UAP)为主;当基质耗尽后,生物生长相关型产物(biomassassociatedproduct,BAP)浓度增加;内源呼吸过程中BAP的产出主要来源于松散胞外聚合物(1ooselyboundEPS,LB)的水解;通过傅里叶变换红外光谱(FTIR)检测表明,UAP主要由多聚糖和蛋白质组成,而BAP主要是多聚糖和腐殖酸;与UAP相比,膜对BAP截留效果较好,最佳的水力停留时间(hydraulicretentiontime,HRT)时MBR出水同时包含UAP及BAP,BAP浓度与膜过滤阻力呈显著正相关。关键词:膜生物反应器;溶解性微生物产物;胞外聚合物;膜过滤特性DOI:10.3969/j.issn.0438—1157.2013.08.043中图分类号:X703.3文献标志码:A文章编号:O438—1157(2013)08—3003—06AnalysisofformationanddegradationmechanismofsolublemicrobialproductanditseffectonmembranefilterabilityformembranebioreactorXILijuan,LONa,ZHANGHaifeng。SUNBaoshengz(SchoolofChemicalEngineering,NortheastDianliUniversity,Jilin132012,Jilin,China;SchoolofEnvironmentalScienceandEngineering,TianjinUniversity,Tianjin300072,China)Abstract:Theformationanddegradationmechanismofsolublemicrobialproduct(SMP)andtheeffectofSMPonmembranefilterabilityformembranebioreactor(MBR)wereinvestigated.Theexperimentalresultsindicatedthatutilizationassociatedproducts(UAP)weremajorcomponentsofSMPwhenorganicsubstratewaspresent.Biomassassociatedproduct(BAP)fromthehydrolysisoflooselybound(LB)extracellularpolymericsubstances(EPS)dominatedSMPwhenorganicsubstratewasconsumed.ByFouriertransforminfraredspectroscopy(FTIR),themajorcomponentsofUAPwereproteinsandpolysaccharides,butthemajorcomponentsoftheBAPwerepo1ysaccharidesandhumicsubstances.ComparedtoUAP,themembranerejectionofBAPhadbetterperformance.Theeffluentofmembranebioreactor(MBR)containedUAPandBAPatoptimalhydraulicretentiontime(HRT).Membrane2013—0l一04收到初稿,2013—05—13收到修改稿。联系人:张海丰。第一作者:郗丽娟(1962一),女,副教授。基金项目:吉林省科技发展计划项目(20120404);吉林市杰出青年基金项目(20106306);中国电机工程学会电力青年科技创新资助项目(2009)。Receiveddate:2Ol3—01一O4.Correspondingauthor:ZHANGHaifeng,associateprofessor,zhftju@163.comFoundationitem:s
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