Removal of fluoride from drinking water using aluminum hydroxide coated rice

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1、JournalofHazardousMaterials185(2011)1287–1294ContentslistsavailableatScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatRemovaloffluoridefromdrinkingwaterusingaluminumhydroxidecoatedricehuskashVivekGanvir∗,KalyanDasTataRese

2、archDevelopmentandDesignCentre,54B,HadapsarIndustrialEstate,Pune411013,IndiaarticleinfoabstractArticlehistory:FluoridecontentingroundwaterthatisgreaterthantheWHOlimitof1.5mg/L,causesdentalandskele-Received4June2010talfluorosis.InIndia,severalstatesareaffected

3、withexcessfluorideingroundwater.TheproblemisReceivedinrevisedform6September2010aggravatedduetothelackofappropriateanduserfriendlydefluoridationtechnology.SeveralfluorideAccepted11October2010removaltechniquesarereportedintheliteratureamongstwhichtheNalgondatechn

4、iqueanduseofAvailableonline16October2010activatedaluminahavebeenstudiedextensively.Howeverasimple,efficientandcosteffectivetechnol-ogyisnotavailableforwidespreaduseinmanyaffectedregions.Inthispaper,wepresentanovelcostKeywords:effectivedefluoridationmethodthati

5、sbasedonsurfacemodificationofricehuskash(RHA)bycoatingFluorideremovalaluminumhydroxide.RHAisobtainedbyburningrice/paddyhuskwhichisanabundantlyavailableandisRicehuskash(RHA)Aluminumhydroxide(AH)coatinganinexpensiverawmaterial.Theresultsshowedexcellentfluoridere

6、movalefficiencyandtheadsorptionAHcoatedRHAcapacitywasfoundtobebetween9and10mg/g.Drinkingwater©2010ElsevierB.V.Allrightsreserved.1.Introductionwherefluoride-bearingmineralsarecommon.Fluorideconcentra-tionsmayalsoincreaseingroundwaterinwhichcationexchangeTheprol

7、ongedintakeofhighconcentrationsoffluoride(moreofsodiumforcalciumoccurs[5].than1.5mg/L)indrinkingwatercausesserioushealthproblemsFluorosisendemicisprevalentinatleast25countriesacrosssuchasdentalandskeletalfluorosis.Thephysiologicaleffectsoftheglobeand62millionp

8、eopleareaffectedwithfluorosisinthefluorideingestiononhumanhealthhavebeenextensivelystudied.world[6].InChina,endemicfluorosishasbeenreportedinall28Theacceptablefluorideconcentrationindrinkingwaterisg