生物产H2O2

EnhanceddisinfectionofwastewaterbycombiningwetlandtreatmentwithbioelectrochemicalH2O2productionJ.B.A.Arends,S.VanDenhouwe1,W.Verstraete,N.Boon,K.Rabaey⇑LaboratoryofMicrobialEcologyandTechnology(LabMET),GhentUniversity,CoupureLinks653,9000Gent,Belgiumhighlights�Aconstructedwetland(CW)wasusedasarapidfilterforsolidsremoval.�ABESwasoperatedwitheffluentoftheCW,generatingupto3.5Am�2.�CathodicH2O2productionwasachievedinwetlandeffluentupto2.7gm�2h�1.�0.1%H2O2inwetlandeffluentdecreasedcoliformsto<75CFUml�1in1h.articleinfoArticlehistory:Received29October2013Receivedinrevisedform10December2013Accepted12December2013Availableonline9January2014Keywords:HydrogenperoxideSolidsremovalCathodeSanitationMicrobialfuelcellabstractAhighly-loadedconstructedwetland(upto44±21gCODm�2d�1)wasconnectedtoabioelectrochemicalsystem(BES)toproducehydrogenperoxidefordisinfectionpurposes.Theanodedeliveredacurrentfromthewetlandeffluentupto3.5Am�2(maximum62%anodicefficiency)butwaslimitedinthesupplyoforganiccarbon.Hydrogenperoxidecouldbeproducedinsituinwetlandeffluent.Productionratesweretestedatvariouscurrentdensitieswithamaximumrateof2.7gmelectrode�2h�1(4hat10Am�2,41%cathodicefficiency).Littledifferencewasobservedbetweenproductionrateinwetlandeffluentora0.3%NaClsolution.Theresultinghydrogenperoxide(0.1%)wasusedtodisinfectwetlandeffluentsuccessfully(<75CFUml�1after1hcontacttime).Thecombinationofwetlandwatertreatmentwithperoxideproduc-tioninaBESthusenablesgeneratinghigherwaterqualities,includingdisinfectedwater,withoutexternalinputofchemicals.�2013ElsevierLtd.Allrightsreserved.1.IntroductionWithagrowingworldpopulation,thepressureonsafe(drink-ing)watersuppliesincreases(Un-Habitat,2010;UNEP,2008).Numeroustechnologiesexisttoprovidecleanandsafewaterflows.However,mosttechnologiesareonlyviableatlargerscalesand/orrequiremaintenanceandqualitycontrolbytrainedoperators.Thereforeitisnotpossibletosupplypeopleinremoteareasorindevelopingcountrieswithadequatewastewatertreatmentandsupplyoffreshwater.Constructedwetlands(CW