Nanofiltration membrane performance on fluoride removal from water

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1、JournalofMembraneScience279(2006)529538NanofiltrationmembraneperformanceonfluorideremovalfromwaterKangHu,JamesM.Dickson∗DepartmentofChemicalEngineering,McMasterUniversity,1280MainStreetWest,Hamilton,Ont.,CanadaL8S4L7Received30March2005;receivedinrevisedform21December2005

2、;accepted24December2005Availableonline31January2006AbstractFluorideconcentrationindrinkingwaterisveryimportantforhumanhealth.Optimalfluoridecontentiswithintherangeof0.51.0mg/L.Nanofiltration(NF)membraneperformanceonfluorideremovalfromhighfluoridecontentwaterwasinvestigated

3、inthisstudy.Themembranesusedarenegativelychargedcommercialthin-filmcomposite(TFC)membranes(DS-5-DL,DS-51-HLandSR-1).Themembraneperformancewasinterpretedintermsofmembraneparameters:purewaterpermeability(LP),poreradius(rP)andconstantsurfaceelectricalpotential(ψ).Theparame

4、terswereobtainedbyfittingthe100and1000ppmsinglesalt(NaF)experimentaldatatoamathematicalmodelthatwasdevelopedbasedontheextendedNernstPlanckequationandtheGrahameequation.TheexperimentalresultsindicatedthattherejectionofNaFincreasedwiththeappliedpressureandthesolutionfluxin

5、creasingandthefeedconcentrationdecreasing.Theexperimentaldatawerecomparedwiththemodeldeveloped.Themodelwasalsousedtopredictthemembraneperformanceat20and2000ppmNaFsolutions.©2006ElsevierB.V.Allrightsreserved.Keywords:Nanofiltration;Fluoride;Negativelycharged;Rejection;So

6、lutionflux1.IntroductionComparedtoothermembraneprocesses,likeROandmicro-filtration,nanofiltration(NF)isarelativelynewprocessandisTheamountoffluorideioninthehumanbodyisanimportantusedtoalesserextentinthewaterindustry.AlthoughNFandfactorthataffectshealth.Anexcessivefluoridein

7、takeisdetri-ROprocessesaresimilar,NFisoperatedatlowerpressuresandmentaltohumanhealthleadingtoseriousproblems,suchascanyieldsamepermeatefluxatlowerpressure.Inparticular,indentalfluorosis[1]andskeletonfluorosis[2].However,fluoridetreatingfluoride-richwaters,NFprocessescanprov

8、ideapartialcaneffectivelypreventdentalcarieswhenarelativelowlevelisdefluoridationandanoptimalfluoridecontentinpermeatec