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《Transformations of particles, metal elements and natural organic matterin different water treatment processes不同水处理过程中颗粒、金属元素和天然有机物的转化》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、JournalofEnvironmentalSciences19(2007)271–277Transformationsofparticles,metalelementsandnaturalorganicmatterindierentwatertreatmentprocessesYANMing-quan,WANGDong-sheng,SHIBao-you,WEIQun-shan,QUJiu-hui,TANGHong-xiaoStateKeyLaboratoryofEnvironmentalAquaticChemistry,ResearchCenterforEco-
2、EnvironmentalSciences,ChineseAcademyofSciences,Beijing100085,China.E-mail:wgds@rcees.ac.cnReceived13March2006;revised8May2006;accepted15May2006AbstractCharacterizingnaturalorganicmatter(NOM),particlesandelementsindierentwatertreatmentprocessescangiveausefulinformationtooptimizewatertre
3、atmentoperations.Inthisarticle,transformationsofparticles,metalelementsandNOMinapilot-scalewatertreatmentplantwereinvestigatedbylaserlightgranularitysystem,particlecounter,glass-fibermembranefiltration,inductivelycoupledplasma-opticalemissionspectroscopy,ultrafiltrationandresinabsorbentsf
4、ractionation.Theresultsshowedthatparticles,NOMandtrihalomethaneformationprecursorswereremovedsynergisticallybysequentialtreatmentofdierentprocesses.Pre-ozonationmarkedlychangedthepolarityandmolecularweightofNOM,anditcouldbeconducivetothefollowingcoagulationprocessthroughdestabilizingpa
5、rticlesandcolloids;mid-ozonationenhancedthesubsequentgranularactivatedcarbon(GAC)filtrationprocessbydecreasingmolecularweightoforganicmatters.Coagulation-flotationandGACweremoreecientinremovingfixedsuspendedsolidsandlargerparticles;whilesand-filtrationwasmoreecientinremovingvolatilesuspe
6、ndedsolidsandsmallerparticles.FlotationperformedbetterthansedimentationintermsofparticleandNOMremoval.Thetypeofcoagulantcouldgreatlyaecttheperformanceofcoagulation-flotation.Pre-hydrolyzedcompositecoagulant(HPAC)wassuperiortoFeCl3concerningtheremovalsofhydrophobicdissolvedorganiccarbona
7、ndvolatilesuspendedsolids.Theleakagesofflocsfromsand-filtrationandmicroorganismsfromGACshouldbemitigatedtoensurethereliabilityofthewholetreatmentsystem.Keywords:flotation;fixedsuspendedsolid;trihalomethaneformationpotential;ultrafiltration;resinabsorbentfractionationIntroductioncontaminan
