Removal of fluoride from water by using granular red mud Batch and

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1、JournalofHazardousMaterials164(2009)271–278ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatRemovaloffluoridefromwaterbyusinggranularredmud:BatchandcolumnstudiesAliTora,∗,NadideDanaoglua,GulsinArslanb,Yun

2、usCengeloglubaSelcukUniversity,DepartmentofEnvironmentalEngineering,Campus,42031Konya,TurkeybSelcukUniversity,DepartmentofChemistry,Campus,42031Konya,TurkeyarticleinfoabstractArticlehistory:Thispaperdescribestheremovaloffluoridefromwaterusinggranularredmud(GRM)accor

3、dingtobatchReceived13May2008andcolumnadsorptiontechniques.Forthebatchtechnique,theexperimentsdemonstratedthatmaxi-Receivedinrevisedform1August2008mumfluorideremovalwasobtainedatapHof4.7andittook6htoattainequilibriumandequilibriumtimeAccepted1August2008didnotdependup

4、ontheinitialfluorideconcentration.Kineticsdatawerefittedwithpseudo-second-orderAvailableonline14August2008model.TheRedlich–PetersonandFreundlichisothermmodelsbetterrepresentedtheadsorptiondataincomparisontotheLangmuirmodel.Columnexperimentswerecarriedoutunderaconstan

5、tinfluentcon-Keywords:centrationandbeddepth,anddifferentflowrates.ThecapacitiesofthebreakthroughandexhaustionGranularredmudpointsdecreasedwithincreaseoftheflowrate.Thomasmodelwasappliedtotheexperimentalresults.FluorideremovalAdsorptionThemodelledbreakthroughcurveswere

6、obtained,andtheywereinagreementwiththecorrespondingexperimentaldata.Thecolumnadsorptionwasreversalandtheregenerationoperationwasaccomplishedbypumping0.2MofNaOHthroughtheloadedGRM-column.©2008ElsevierB.V.Allrightsreserved.1.Introduction[19],redmud[2],gasconcretemate

7、rial[20],montmorillonite[3],etc.,foradsorptionoffluoridefromwater.Fluorideindrinkingwatercanbeeitherbeneficialordetrimen-Adsorptionstudiesusingredmudfromaluminarefineriesastaltohealthdependingonitsconcentration.Maintainingfluorideunconventionaladsorbentforwaterandwaste

8、watertreatmentconcentrationof1mg/Linthedietaryintakecanpreventskeletalpurposesaremotivatedbythefactthatredmudisafine-grainedanddentalproblems.Howe