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1、DESALINATIONELSEVIERDesalination133(2001)215-223www.elsevier.com/locate/desalFluorideremovalCornbrackishwaterbyelectrodialysisZakiaAmof,BernardBarioub,NabilMameri,MohamedTaky,StephanNicolasb,AzzedineElmidaoui*LaboratoireaksProct!&sdeSepartion,FacultkaksSciences,Depart
2、ementdeChimie,Giversit&IbnTofail,BP1246,Kbnitra,MarocTel.&Fax:+212(37)373033IUTDkpartementdeChimie,UniversitbdeRennes,RueclosCourtel,3500Rennes,FranceBiotechnologyLaboratory,EcolePolytechniquedAlger,IOAvenuePasteur,ElHarrach,Alger,AlgkrieReceived23March2000;accepted10
3、November2000AbstractStudieshavebeenconductedtoreducefluorinebyelectrodialysisfromabrackishwatercontaining3000ppmoftotaldissolvedsolids(TDS)and3ppmoffluoride.Twomethodshavebeenproposedanddescribedtominimizetheprecipitationrisksofthebivalentsaltsintheconcentratecompartm
4、ent.Measurementsindicatethatafterelectrodialysis,thetargetsconcerningthequalityofproducedwaterwereallachieved.Themethodwithoutchemicalpretreatmentseemsmoresimpletoconductandmoreadaptedtoenvironmentalrequirementsthanthemethodwithpretreatment.Fromthesestudiesitisdemonst
5、ratedthatelectrodialysisisareasonableprocessforremovingfluoridefrombrackishwater.KvorakDefluoridation;Brackishwater;Electrodialysis1.Introductioncausesharmfuleffectssuchasdentalandskeletalfluorosis.AccordingtotheWorldHealthOrgani-InmanypartsofNorthAfrica,wateriszation
6、,themaximumacceptableconcentrationofbrackishandcontainsover1.5mg/lfluoride.Influoridesis1.5mg/l.OnemethodthatcanhelpMoroccotheconcentrationoffluorideinwaterinsolvetheproblemistoseekanalternatedrinkingsomeregionsexceeds5mg/landsometimeswatersourcewithlowfluoride.Ifthis
7、isreaches20mg/l[1,2].Theeffectsoffluorideunattainable,defluoridationbecomesobligatory.containedindrinkingwater,whichmaybeManymethodshavebeendevelopedtobeneficialorharmfuldependingonitsconcen-removeexcessivefluoridefromdrinkingwatertration,havebeenwidelystudied.Itiswel
8、l[3-91.Thesemethodscanbedividedintofourknownthatexcessivefluorideindrinkingwatertypes:chemicaladsorption,chemicalprecipi-tat
