PAC影响MBR污泥混合液特性及膜污染研究
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2020-02-27 13:17:17
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第32卷第2期2011年2月环境科学ENVIRONMENTALSCIENCEVol.32,No.2Feb.,2011PAC影响MBR污泥混合液特性及膜污染研究李绍峰1,高元2(1.深圳职业技术学院建筑与环境工程系,深圳518055;2.东北农业大学资源与环境学院,哈尔滨150030)摘要:通过对比试验考察了投加PAC对MBR污泥混合液特性的影响,拟合EPS与泥饼层阻力Rc和SMP与膜孔堵塞阻力Rp的关系,并在此基础上进一步探讨了PAC减缓膜污染的原因.结果表明,投加PAC可以降低混合液黏度,增大污泥粒径,减缓过膜压力的增加;混合液EPS含量、污泥比阻与Rc具有很好的相关性,PAC的投加降低了EPS含量,减小污泥比阻,减缓Rc增加速度,减轻膜污染;Rp随上清液中SMP浓度增大呈指数增加,PAC的投加降低了SMP浓度,从而减缓了Rp的增长速度;两反应器运行过程中,Rc和Rp逐渐增大,但Rc/Rf(26.32%~63.16%)始终大于Rp/Rf(7.89%~35.32%),说明Rc是膜污染的主要因素,投加PAC对控制Rc的作用大于对Rp的减缓作用.关键词:膜生物反应器;粉末活性炭;相对分子质量分布;污泥比阻;膜污染中图分类号:X705文献标识码:A文章编号:0250-3301(2011)02-0508-07收稿日期:2010-01-26;修订日期:2010-03-26基金项目:广东省自然科学基金项目(07009031)作者简介:李绍峰(1972~),男,博士,教授,主要研究方向为水污染控制及污水资源化技术,E-mail:solve28@163.comEffectofPowderedActivatedCarbonontheSludgeMixedLiquorCharacteristicsandMembraneFoulingofMBRLIShao-feng1,GAOYuan2(1.DepartmentofBuilding&EnvironmentalEngineering,ShenzhenPolytechnicInstitute,Shenzhen518055,China;2.SchoolofResource&Environment,NortheastAgriculturalUniversity,Harbin150030,China)Abstract:Effectofdosingpowderactivatedcarbon(PAC)onthecharacteristicsofthesludgemixedliquorinmembranebioreactor(MBR)wasinvestigatedbyparalleltests.AndthereasonthatPACmitigatedmembranefoulingwasalsoexplored.TheresultsshowedthatPACcoulddecreasemixtureviscosityandincreasesludgeparticlesize,whichledtolesstrans-membranepressuredeveloping.Extracellularpolymersubstances(EPS)content,sludgespecificresistanceandcakelayerresistance(Rc)hadagoodcorrelation.AddingPACcoulddecreaseEPSconcentration,sludgespecificresistanceandthenslowdowntheincreaseofRc,whichmitigatedmembranefouling.Membraneporeblockingresistance(Rp)increasedexponentiallywithincreasingofthesolublemicrobialproducts(SMP)concentrationinthesupernatant.DosingPACreducedtheSMPconcentrationandsloweddownthegrowthrateofRp,whichwashelpfultomitigatingmembranefouling.RcandRpincreasedalongwiththeoperationofMBRsandRc/Rf(26.32%-63.16%)wasalwaysgreaterthanRp/Rf(7.89%-35.32%)whichsuggestedtheRcwasthemainfactorinmembranefouling.Moreover,itwasalsofoundthatcontrollingofdosingPACon
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