外文资料--Biosorption characteristics of extracellular polymeric.PDF外文资料--Biosorption characteristics of extracellular polymeric.PDF

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BIOSORPTIONCHARACTERISTICSOFEXTRACELLULARPOLYMERICSUBSTANCEEPSPRODUCEDBYRHIZOBIUMRADIOBACTERFORREMOVALOFCUIIANDMNIIIONSFORMAQUEOUSSOLUTIONSLILIWANGA,B,FANGMAA,B,SHANSHANFENGA,B,DEZHISUNB,C,BINGYUA,B,JIEXINGA,BASTATEKEYLABORATORYOFURBANWATERRESOURCEANDENVIRONMENT,HARBIN,150090,CHINABDEPARTMENTOFMUNICIPALANDENVIRONMENTALENGINEERING,HARBININSTITUTEOFTECHNOLOGYCCOLLEGEOFENVIRONMENTALSCIENCEANDENGINEERING,BEIJINGFORESTRYUNIVERSITY,BEIJING100083,CHINAEMAILLIILIVE163COMABSTRACTTHISPAPERDEALSWITHTHEEXTRACELLULARPOLYMERICSUBSTANCEEPSOFRHIZOBIUMRADIOBACTERF2USEDASANOVELBIOSORBENTTOREMOVECUIIANDMNIIIONSFROMAQUEOUSSOLUTIONSTHECUIIANDMNIIIONSBIOSORPTIONCHARACTERISTICSOFTHEEPSWEREEXAMINEDASAFUNCTIONOFINITIALPH,CONTACTTIMEANDEPSCONCENTRATIONTHEPROPERPHOFTHEAQUEOUSSOLUTIONWASFOUNDTOBE60FORBOTHTHEBIOSORPTIONOFCUIIANDMNIIBIOSORPTIONEQUILIBRIUMTIMESOFCUIIANDMNIIWEREACHIEVEDIN10HTHEMAXIMUMBIOSORPTIONCAPACITIESUNDEROPTIMUMCONDITIONSOFCUIIANDMNIIONTHEEPSWEREDETERMINEDTOBE4530162MG/GAND2886128MG/G,RESPECTIVELYTHEFITNESSOFTHEBIOSORPTIONDATAFORLANGMUIRANDFREUNDLICHISOTHERMMODELSWASINVESTIGATEDITWASFOUNDTHATBIOSORPTIONOFCUIIANDMNIIIONSONTOTHEEPSWEREBETTERSUITABLETOLANGMUIRTHANFREUNDLICHISOTHERMMODELCOMPETITIVEBIOSORPTIONOFMNIIANDCUIIIONSWASALSOINVESTIGATEDTODETERMINETHESELECTIVITYOFTHEBIOFLOCCULANTKEYWORDSBIOSORPTION;EXTRACELLULARPOLYMERICSUBSTANCEEPS;CUII;MNII;COMPETITIVEBIOSORPTIONIINTRODUCTIONHEADING1WATERANDWASTEWATERSCONTAMINATEDBYHEAVYMETALSHAVERESULTEDINADVERSEIMPACTONPUBLICHEALTHANDECONOMY1,ANDEXPOSURETOHEAVYMETALSEVENATTRACELEVELSISBELIEVEDTOBEARISKFORHUMANBEINGS2INTHEPASTDECADESVARIOUSPROCESSESHAVEBEENDEVELOPEDTOTREATSUCHWATERSINCLUDINGCHEMICALPRECIPITATION,IONEXCHANGE,ADSORPTIONANDREVERSEOSMOSIS3HOWEVER,THESEMETHODSARESOMETIMESRESTRICTEDBECAUSEOFTECHNICALAND/ORECONOMICALCONSTRAINTS4BIOSORPTIONISCONSIDEREDASANALTERNATIVEPROCESSFORTHEREMOVALOFHEAVYMETALS,METALLOIDSPECIES,COMPOUNDSANDPARTICLESFROMAQUEOUSSOLUTIONBYBIOLOGICALMATERIALS5COMPAREDWITHCONVENTIONALMETHODSFORTHEREMOVALOFTOXICMETALSFROMWASTEWATER,THEBIOSORPTIONPROCESSOFFERSPOTENTIALADVANTAGESSUCHASLOWOPERATINGCOST,MINIMIZATIONOFTHEVOLUMEOFCHEMICALAND/ORBIOLOGICALSLUDGETOBEDISPOSEDOF,ANDHIGHEFFICIENCYINDETOXIFYINGVERYDILUTEEFFLUENTS6THISPAPERWASCARRIEDOUTTOINVESTIGATETHEEPSPRODUCEDBYCULTUREOFRHIZOBIUMRADIOBACTERF2ASABIOSORBENTFORTHEREMOVALOFMNIIANDCUIIFROMAQUEOUSSOLUTIONSTHEOPTIMUMBIOSORPTIONCONDITIONSWEREDETERMINEDSUCHASINITIALPH,CONTACTTIMEANDDOSAGEOFTHEEPSTHESUITABLEBIOSORPTIONISOTHERMWASPUTFORWARDBASEDONTHEBIOSORPTIONDATAINADDITION,THEBIOSORPTIONPERFORMANCEOFTHEEPSINBINARYMETALSOLUTIONSYSTEMSWASALSOEXAMINEDTHECHOICEOFMETALSWASMADEREGARDINGTHEIRINDUSTRIALUSEANDPOTENTIALPOLLUTIONIMPACTCUISNOTACUTELYTOXICTOHUMANSBUTITSEXTENSIVEUSEANDINCREASINGLEVELSINTHEENVIRONMENTMAYCAUSESERIOUSHEALTHPROBLEMS7MNREMOVALISONEOFTHEPROBLEMSINUSINGGROUNDWATERSINCEMNISACOMMONELEMENTINGROUNDWATERELEVATEDLEVELSOFMNINDRINKINGWATERARECONSIDEREDUNDESIRABLEWHENWATERISEXPOSEDTOAIR,MNIIISOXIDIZEDTOMNIVTHEMNIVPRECIPITATECANSTAINHOUSEHOLDUTENSILSANDCLOTHESANDMAYIMPARTAMETALLIC,BITTER,ASTRINGENTORMEDICINALTASTETOTHEWATER8IIMETHODSAMICROORGANISMSSTRAINF2WASORIGINALLYSCREENEDFROMSOILBYSTATEKEYLABORATORYOFURBANWATERRESOURCEANDENVIRONMENTSKLUWREANDIDENTIFIEDASRHIZOBIUMRADIOBACTERBPREPARATIONOFTHEEPSOFF2THECOMPOSITIONOFPRODUCTIONMEDIUMWASASFOLLOWSPERLITER10GGLUCOSE,5GK2HPO4,2GKH2PO4,05GPEPTONE,05GUREA,02GMGSO47H2O,AND02GNACLCORRELATIVEDETAILSWEREDESCRIBEDINAPREVIOUSPAPERBYZHUETAL9NATIONAL863PROGRAMSQ2009AA06XK14824129781424447138/10/25002010IEEETHEFERMENTATIONBROTHWASCENTRIFUGEDAT16,000GFOR20MINTOREMOVECELLSTWOVOLUMESOF4℃COLDETHANOLWEREADDEDTOTHESUPERNATANTANDSTOREDAT4℃FOR24HTHEPRECIPITATEWASOBTAINEDBYCENTRIFUGATIONAT10,000GFOR5MINANDWASHEDSEVERALTIMESWITHETHANOLTHENTHEPRECIPITATEWASLYOPHILIZEDANDTHECRUDECOMPOUNDBIOFLOCCULANTWASOBTAINEDCBIOSORPTIONEXPERIMENTSMNIIANDCUIISOLUTIONSWEREPREPAREDFROM1000MG/LSTOCKSOLUTIONSOFCUIIANDMNIIOBTAINEDBYDISSOLVINGCUSO45H2OANDMNSO4H2OINDOUBLEDISTILLEDWATER,RESPECTIVELYTHELYOPHILIZEDEPSWASDISSOLVEDINDOUBLEDISTILLEDWASTOGIVEA2G/LSOLUTIONTHEADSORPTIONSTUDIESWERECARRIEDOUTIN250MLERLENMEYERFLASKSINTHEFIRSTGROUPOFEXPERIMENTS,BIOSORPTIONOFMANGANESEIIANDCOPPERIIFROMAQUEOUSSOLUTIONSCONTAININGASINGLEMETALIONWASINVESTIGATEDTHEEFFECTOFPHONTHEBIOSORPTIONOFCOPPERIIANDMANGANESEIIONTHEEPSWASINVESTIGATEDINTHEPHRANGEOF2070100MLOFSOLUTIONSCONTAINING100MG/LMANGANESEIIAND100MG/LCOPPERIIIONSWEREPREPAREDUSINGTHESTOCKSOLUTIONS,RESPECTIVELYTHEINITIALPHOFEACHMETALSOLUTIONWASADJUSTEDTOTHEREQUIREDPHVALUETHEN3MLOFTHEEPSSOLUTIONWASADDEDTOTHEEACHMETALSOLUTIONANDTHEMIXTUREWASSHAKENONANORBITALSHAKERAT125R/MINAND25℃01FOR2HSIMILARLY,METALSOLUTIONSWITH100MG/LMETALIONSWEREUSEDTOINVESTIGATETHEPROPERCONTACTTIMERANGINGFROM05TO3HWITHATIMEINTERVALOF05HINTHELATTEREXPERIMENTS,THEDOSAGEOFTHEEPSVARIEDFROM1TO5MLUSINGSOLUTIONSCONTAINING100MG/LMETALIONSTHEIRCONTENTSWERECENTRIFUGEDAT3600GFOR5MINANDTHESUPERNATANTWASANALYZEDFORRESIDUALMETALIONCONCENTRATIONINTHESECONDGROUPOFEXPERIMENTS,COMPETITIVEBIOSORPTIONOFMNIIANDCUIIION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本文标题:外文资料--Biosorption characteristics of extracellular polymeric.PDF
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