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1、JournalofHazardousMaterials179(2010)276–280ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatFluorideremovalfromindustrialwastewaterusingelectrocoagulationanditsadsorptionkineticsVahidKhatibikamala,∗,AliTorabi
2、ana,1,FatemehJanpoora,2,GholamaliHoshyaripourb,3aDepartmentofCivilandEnvironmentalEngineering,GraduateFacultyofEnvironment,UniversityofTehran,IranbCenterforMarineandAtmosphericSciences,InstituteofGeophysics,UniversityofHamburg,GermanyarticleinfoabstractArticlehistory:El
3、ectrocoagulation(EC)processusingaluminumelectrodesisproposedforremovingfluoridefromReceived3November2009treatedindustrialwastewateroriginatedfromsteelindustry.EffectsofdifferentoperatingconditionsReceivedinrevisedform25February2010suchastemperature,pH,voltage,hydraulicre
4、tentiontime(HRT)andnumberofaluminumplatesAccepted28February2010betweenanodeandcathodeplatesonremovalefficiencyareinvestigated.ExperimentalresultsshowedAvailableonline6March2010thatbyincreasingHRT,removalefficiencyincreasesbutafter5minchangesarenegligible.Therefore,thetota
5、lHRTrequiredisonly5min.ThemoreHRT,themoreelectricalcurrentisneededinordertoachieveKeywords:toconstantvoltageandtemperatureinsystem.Inaddition,itisfoundthatpHvaluedecreasesfrom6.91Electrocoagulationto4.6duringfirst10minbutitincreasesupto9.5during50min.Aftertreatment,theflu
6、orideconcen-FluorideremovalTreatedindustrialwastewatertrationwasreducedfrominitial4.0–6.0mg/Ltolowerthan0.5mg/L.ThepHoftheinfluentisfoundasaHydraulicretentiontimeveryimportantvariablewhichaffectsfluorideremovalsignificantly.TheoptimalrangefortheinfluentisAdsorptionkinetic6.
7、0–7.0atwhichnotonlyeffectivedefluoridationcanbeachieved,butalsonopHreadjustmentisneededaftertreatment.Moreover,increasingnumberofaluminumplatesbetweenanodeandcathodeplatesinbipolarsystemdoesnotsignificantlyaffectfluorideremoval.Finally,thekineticanalysisisdoneforthesystemw
8、hichindicatesthattheadsorptionsystemobeysthesecond-orderkineticmodel.©2010ElsevierB.V.Allrightsreserved.1.Intr
