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1、ChemicalEngineeringJournal164(2010)106–114ContentslistsavailableatScienceDirectChemicalEngineeringJournaljournalhomepage:www.elsevier.com/locate/cejKineticstudyofdefluoridationofdrinkingwaterbyelectrocoagulation/electroflotationinastirredtankreactorandinanexternal-loopairliftreactorA.H.Es
2、sadkia,∗,B.Gouricha,M.Azzib,Ch.Vialc,H.DelmasdaEcoleSupérieuredeTechnologiedeCasablanca,BP8012,OasisCasablanca,MoroccobFacultédesSciencesAïnChock,Laboratoired’ElectrochimieetChimiedel’Environnement,BP5366,Maarif,Casablanca,MoroccocClermontUniversité,ENSCCF,LGCB,24avenuedesLandais,BP206,
3、63174AubièreCedex,FrancedLaboratoiredeGénieChimique,ENSIACET-INPT,5ruePaulinTalabot,31106Toulouse,FrancearticleinfoabstractArticlehistory:Akineticstudyofdefluoridationofdrinkingwaterwascarriedoutusingtheelectrocoagula-Received7October2009tion/electroflotationprocessintwobatchreactorsofide
4、nticalvolume(20L):astirredtankreactor(STR)Receivedinrevisedform12August2010andanexternal-loopairliftreactor(ELALR).WhentheevolutionoffluoridecontentwasindependentofAccepted17August2010stirringspeed,experimentalresultsshowedthatthekineticsoffluorideremovalcouldbemodelledusingavariable-orde
5、r-kinetic(VOK)approachcoupledwithaLangmuir–FreundlichadsorptionmodelintheKeywords:STR.Conversely,whenmixingwaslessefficient,whichisthecaseintheELALR,experimentaldatacouldDefluoridationbefittedadequatelyonlyusingapseudo-first-ordermodel.ThisconstituteshoweveronlyanempiricalElectrocoagulation
6、approachbasedonalumpedparameterthataccountssimultaneouslyformasstransfer,adsorptionandElectroflotationAdsorptionkineticselectrochemicalsteps.Inthiscase,onlyregressionanalysiscouldbeusedtoestablishaquantitativerela-Langmuir–Freundlichisothermtionshipbetweenthekineticconstantandtheoperatin
7、gconditions,suchascurrentdensityandinitialfluorideconcentration.©2010ElsevierB.V.Allrightsreserved.1.Introductionhavebeenwidelyapplied,theypresentmanylimitations[9].Forexample,theregenerationofadsorbentsbychemicalandthermalAnexcessamountoffluorideanionsindrinkingwaterhasbeenproce
