a-combined-system-of-microbial-fuel-cell-and-membrane-bioreactor

Performanceofacombinedsystemofmicrobialfuelcellandmembranebioreactor:Wastewatertreatment,sludgereduction,energyrecoveryandmembranefoulingXinyingSub,YuTiana,b,n,ZhicaiSunc,YaobinLub,ZhipengLibaStateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology(SKLUWRE,HIT),Harbin150090,ChinabSchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,ChinacDaqingWaterGroupCompanyLimited,Daqing163311,ChinaarticleinfoArticlehistory:Received25February2013Receivedinrevisedform2April2013Accepted4April2013Availableonline18April2013Keywords:Membranebioreactor(MBR)Microbialfuelcell(MFC)MembranefoulingLooselyboundEPS(LB-EPS)EnergyrecoveryabstractAnovelcombinedsystemofsludgemicrobialfuelcell(S-MFC)stackandmembranebioreactor(MBR)wasproposedinthisstudy.Thenon-consumedsludgeintheMBRsludge-fedS-MFCwasrecycledtotheMBR.Inthecombinedsystem,theCODandammoniatreatmentefficienciesweremorethan90%andthesludgereductionwas5.1%higherthanthatoftheconventionalMBR.It'sworthnotingthattheenergyrecoveryandfoulingmitigationwereobservedinthecombinedsystem.InthesingleS-MFC,about75mgL−1CODcouldbetranslatedtoelectricityduringonecycle.TheaveragevoltageandmaximumpowerproductionofthesingleS-MFCwere430mVand51mWm−2,respectively.Additionally,thecombinedsystemwasabletomitigatemembranefoulingbythesludgemodification.Exceptforthecontentdecrease(22%),S-MFCdestroyedsimplearomaticproteinsandtryptophanprotein-likesubstancesinlooselyboundextracellularpolymericsubstances(LB-EPS).Theseresultsindicatedthateffectivewastewatertreatment,sludgereduction,energyrecoveryandmembranefoulingmitigationcouldbeobtainedinthecombinedsystem.&2013ElsevierB.V.Allrightsreserved.1.IntroductionAsefficienttechnologyforwastewatertreatment,membranebioreactors(MBRs)haveexperiencedunprecedentedgrowthinrecentyears(FanandZhou,2007).MBRsofferseveraladvantagesoverconventionalactivatedsludgesystem,includingstableandhigheffluentquality,easeofoperation,smallfootprint,andabsoluteremovalofbacteria(Wangetal.,2009b).Ho