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1、ChemicalEngineeringJournal164(2010)106–114ContentslistsavailableatScienceDirectChemicalEngineeringJournaljournalhomepage:www.elsevier.com/locate/cejKineticstudyofde?uoridationofdrinkingwaterbyelectrocoagulation/electro?otationinastirredtankreactorandinanexternal-loopairliftreactorA.H.Es
2、sadkia,?,B.Gouricha,M.Azzib,Ch.Vialc,H.DelmasdaEcoleSupérieuredeTechnologiedeCasablanca,BP8012,OasisCasablanca,MoroccobFacultédesSciencesA?nChock,Laboratoired’ElectrochimieetChimiedel’Environnement,BP5366,Maarif,Casablanca,MoroccocClermontUniversité,ENSCCF,LGCB,24avenuedesLandais,BP206,
3、63174AubièreCedex,FrancedLaboratoiredeGénieChimique,ENSIACET-INPT,5ruePaulinTalabot,31106Toulouse,FrancearticleinfoabstractArticlehistory:Akineticstudyofde?uoridationofdrinkingwaterwascarriedoutusingtheelectrocoagula-Received7October2009tion/electro?otationprocessintwobatchreactorsofide
4、nticalvolume(20L):astirredtankreactor(STR)Receivedinrevisedform12August2010andanexternal-loopairliftreactor(ELALR).Whentheevolutionof?uoridecontentwasindependentofAccepted17August2010stirringspeed,experimentalresultsshowedthatthekineticsof?uorideremovalcouldbemodelledusingavariable-orde
5、r-kinetic(VOK)approachcoupledwithaLangmuir–FreundlichadsorptionmodelintheKeywords:STR.Conversely,whenmixingwaslessef?cient,whichisthecaseintheELALR,experimentaldatacouldDe?uoridationbe?ttedadequatelyonlyusingapseudo-?rst-ordermodel.ThisconstituteshoweveronlyanempiricalElectrocoagulation
6、approachbasedonalumpedparameterthataccountssimultaneouslyformasstransfer,adsorptionandElectro?otationAdsorptionkineticselectrochemicalsteps.Inthiscase,onlyregressionanalysiscouldbeusedtoestablishaquantitativerela-Langmuir–Freundlichisothermtionshipbetweenthekineticconstantandtheoperatin
7、gconditions,suchascurrentdensityandinitial?uorideconcentration.?2010ElsevierB.V.Allrightsreserved.1.Introductionhavebeenwidelyapplied,theypresentmanylimitations[9].Forexample,theregenerationofadsorbentsbychemicalandthermalAnexcessamountof?uorideanionsindrinkingwaterhasbeenproce
