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1、JournalofHazardousMaterials185(2011)1287–1294ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatRemovalof?uoridefromdrinkingwaterusingaluminumhydroxidecoatedricehuskashVivekGanvir?,KalyanDasTataRese
2、archDevelopmentandDesignCentre,54B,HadapsarIndustrialEstate,Pune411013,IndiaarticleinfoabstractArticlehistory:FluoridecontentingroundwaterthatisgreaterthantheWHOlimitof1.5mg/L,causesdentalandskele-Received4June2010tal?uorosis.InIndia,severalstatesareaffected
3、withexcess?uorideingroundwater.TheproblemisReceivedinrevisedform6September2010aggravatedduetothelackofappropriateanduserfriendlyde?uoridationtechnology.Several?uorideAccepted11October2010removaltechniquesarereportedintheliteratureamongstwhichtheNalgondatechn
4、iqueanduseofAvailableonline16October2010activatedaluminahavebeenstudiedextensively.Howeverasimple,ef?cientandcosteffectivetechnol-ogyisnotavailableforwidespreaduseinmanyaffectedregions.Inthispaper,wepresentanovelcostKeywords:effectivede?uoridationmethodthati
5、sbasedonsurfacemodi?cationofricehuskash(RHA)bycoatingFluorideremovalaluminumhydroxide.RHAisobtainedbyburningrice/paddyhuskwhichisanabundantlyavailableandisRicehuskash(RHA)Aluminumhydroxide(AH)coatinganinexpensiverawmaterial.Theresultsshowedexcellent?uoridere
6、movalef?ciencyandtheadsorptionAHcoatedRHAcapacitywasfoundtobebetween9and10mg/g.Drinkingwater?2010ElsevierB.V.Allrightsreserved.1.Introductionwhere?uoride-bearingmineralsarecommon.Fluorideconcentra-tionsmayalsoincreaseingroundwaterinwhichcationexchangeTheprol
7、ongedintakeofhighconcentrationsof?uoride(moreofsodiumforcalciumoccurs[5].than1.5mg/L)indrinkingwatercausesserioushealthproblemsFluorosisendemicisprevalentinatleast25countriesacrosssuchasdentalandskeletal?uorosis.Thephysiologicaleffectsoftheglobeand62millionp
8、eopleareaffectedwith?uorosisinthe?uorideingestiononhumanhealthhavebeenextensivelystudied.world[6].InChina,endemic?uorosishasbeenreportedinall28Theacceptable?uorideconcentrationindrinkingwaterisg
