电絮凝-Removal of Zn(II), Cu(II), Ni(II), Ag(I) and

电絮凝-Removal of Zn(II), Cu(II), Ni(II), Ag(I) andAvailableonlineatwww.sciencedirect.comJournalofHazardousMaterials152(2008)934–941RemovalofZn(II),Cu(II),Ni(II),Ag(I)andCr(VI)presentinaqueoussolutionsbyaluminiumelectrocoagulationIlonaHeidmann∗,WolfgangCalmanoInstituteofEnvironmentalTechnologyandEnergyEconomics,HamburgUniversityofTechnology,EissendorferStr.40,21073Hamburg,GermanyReceived31October2006;receivedinrevisedform4June2007;accepted24July2007Availableonline27July2007AbstractTheperformanceofanelectrocoagulationsystemwithaluminiumelectrodesforremovingheavymetalions(Zn2+,Cu2+,Ni2+,Ag+,Cr2O72−)onlaboratoryscalewasstudiedsystematically.Severalparameters–suchasinitialmetalconcentration,numbersofmetalspresent,chargeloadingandcurrentdensity–andtheirinfluenceontheelectrocoagulationprocesswereinvestigated.Initialconcentrationsfrom50to5000mgL−1Zn,Cu,NiandAgdidnotinfluencetheremovalrates,whereashigherinitialconcentrationscausedhigherremovalratesofCr.Increasingthecurrentdensityacceleratedtheele