干硝化好氧颗粒污泥对Pb2的吸附特性与机理

2812201512ＲesearchofEnvironmentalSciencesVol．28No．12Dec．2015．Pb2+J．201528121923-1930．LIUMingTANGChaochunZHONGChengetal．DriedbiomassfromnitrifiedaerobicgranularsludgeforPb2+adsorptionbehaviorsandmechanismsJ．ＲesearchofEnvironmentalSciences201528121923-1930．2[e-mail]．*[e-mail]2+*330013、、Pb2+．LangmuirPb2+Pb2+25℃79.58mggＲ20.9901.ρPb2+20、40、60mgLＲ21.0000、1.0000、0.9999ＲC30.706%、28.019%、24.188%50%Pb2+．FTIＲPb2+O—H、N—H、CO、CC、C—OH、C—O—C．、pHZCP2.53.1Pb2+．Pb2+、、．Pb2+X703.11001-6929201512-1923-08ADOI10.13198j．issn．1001-6929．2015．12．15DriedBiomassfromNitrifiedAerobicGranularSludgeforPb2+AdsorptionBehaviorsandMechanismsLIUMingTANGChaochun*ZHONGChengCHENHuiminYEXinCollegeofCivilEngineeringandArchitectureEastChinaJiaotongUniversityNanchang330013ChinaAbstractBecausenitrifiedaerobicgranularsludgeexhibitshighporositylargesurfaceareaanddecentseparationcapacityaerobicgranularsludgecanbeutilizedasabiologicaladsorbent．InthisstudynitrifiedaerobicgranularsludgewasusedtoremovePb2+fromaqueoussolution．DifferentinitialpHvaluesinitialPb2+concentrationsadsorbentdosesandtemperaturesonPb2+adsorptionwereevaluatedaswell．Threetypesofadsorptionisothermsi．e．byLangmuirFreundlichandＲedlich-Petersonmodelswereinvestigated．TheresultsindicatedthattheequilibriumwaswelldescribedbytheLangmuirisothermpredictingthattheadsorptionofPb2+onnitrifiedaerobicgranuleswasamonolayeradsorption．TheＲ2was0.9901andthemaximumadsorptioncapacitywas79.58mggat25℃．Moreovertheequilibriumkineticadsorptiondatawerefittedtothepseudo-second-orderkineticequationwithＲ2valuesof1.00001.0000and0.9999respectively．TherelationcoefficientsＲCwhichwere30.706%28.019%and24.188%wereallunder50%showingthatthesorptionofPb2+wascontrolledprimarilybyintraparticlediffusion．FouriertransforminfraredspectroscopyFTIＲresultsindicatedthattheactivegroupsincludingO—HN—HCOCCC—OHandC—O—CwereinvolvedinPb2+adsorption．ZetapotentialanalysisandpHZCProsefrom2.5to3.1demonstratingthatinner-sphereadsorptionhappenedforPb2+adsorptiononnitrifiedaerobicgranules．ThenitrifiedaerobicparticleswerewellfittedbythegoodadsorptionfunctiononPb2+theadsorptionmechanismsmainlyincludedinorganicmicroprecipitationsurfacecomplexationinner-spherecomplexationreactionandionexchange．KeywordsnitrifiedaerobicgranularsludgePb2+adsorptionkineticmechanismPb、Cu、Ni、Cd、Cr1-3．4．Pb28、5-6．Pbρ0.16mgL7．、、、8-9．10-11Zn2+、Cd2+、Cu2+Ni2+．、．SBＲPb2+．11.1PHS-3CpH90PlusZetaBＲOOHKHAVENCoSHZ-82AAB204-NMETTLEＲ-TOLEDOSpectrumOnePerKinElmerSU-8020HitachiAA280FSOxfordINCAXOxford．1.2360℃．1.3PbNO321.5989gPbNO32ρPb2+1000mgL．1.41.4.1pHρPb2+20mgLPbNO32100mL8250mL0.1molLNaOH0.1molLHClpH2.0、2.5、3.0、3.5、4.0、4.5、5.0、5.5ρ1.0gL25℃、200rmin12.0hρPb2+、pH、Zeta．1.4.2100mLρPb2+20、40、60mgLPbNO32250mLpH4.01.0gL25℃、200rminρPb2+．1.4.3ρPb2+20mgL100mL250mLpH4.00.1、0.2、0.3、0.4、0.5、0.81.0gL25℃、200rmin2.0hρPb2+．1.4.4Pb2+100mLρPb2+10、20、40、60、80100mgLPbNO32250mLpH4.00.1gL25、35、45℃200rmin2.0hρPb2+．1.4.53000rmin15min0.45μmρPb2+．、KBrFTIＲ400～4000cm－1．1.5η12η=C0－CeC0×100%C0Ce、ρPb2+mgL．13-14Q=C0－Ce×VmQmggVLmg．Langmuir15Qe=Q0bCe1+bCeQemggQ0mggbLangmuirb．Freundlich12Qe=KfCe1n429112Pb2+KfFreundlichn．、．Qt=Qe1－e－k1tQt=Qt2k2t1+Qtk2tQttPb2+mggk1min－1k2gmg·min．WebberMorris16Qt=kpt0.5+Ikpmgg·min0.5Imgg．22.1pH0pHpHZCPpH＜pHZCPpH=pHZCPpH＞pHZCP17．1pHZCP2.5pH＞2.5Pb2+．1pHZCPFig.1pHZCPcurveofnitrifiedaerobicgranularsludgeVisualMINTEQρPb2+100mgLpHPb．2pH≤5.0Pb2+91.7%PbPb2+．Pb2+pH2.5～5.0pH2.0～5.5.pHPb2+3．3pH=2.0Pb2+0.8mggpH＜2.5pH2ρPb2+100mgLpHPbFig.2ThedissolvedspeciesofleadionatdifferentpHwhentheρPb2+was100mgLH3O+H3O+Pb2+Pb2+18-19．pH2.5～4.0pH2.5～3.5pH4.018.9mgg．pH—NH2、—COOH、—OH1pH＞2.5Zeta0Pb2+．pH=5.6Pb2+59.2%PbpH＞5.5．pH3.5～5.0pH4.0.3pHPb2+Fig.3EffectofpHonadsorptionofPb2+4pH2.0～4.9pHLewisPb2+、4.9～5.5pHpHPb2+Lewis20CHEN21529128．Pb2+pH．4、pHFig.4ThechangesofpHbeforeandaftertheadsorption5Pb2+0.5gLPb2+90.6%Pb2+90%1.0gLPb2+94.9%．0.1～1.0gLPb2+．0.1～0.3gLPb2+46～51mgg＞0.3～1.0gL．22．5Pb2+Fig.5EffectofbiomassweightonadsorptionofPb2+2.2Pb2+6Pb2+0～60min60min60min．ρPb2+20、40、60mgLPb2+19.15、38.32、49.32mgg．20～60minPb2+60min．2minpH10minpH4.04.5pH3pHPb2+pHpH．ρPb2+mgL1—202—403—60．6Pb2+Fig.6EffectofadsorptiontimeonnitrifiedaerobicgranularsludgeforPb2+adsorptionPb2+1．1ρPb2+20、40、60mgLＲ20.9143、0.9329、0.94851.0000、1.0000、0.9999ρPb2+20mgL19.3424mgg．222．Pb2+．1ρPb2+kPρPb2+Pb2+．629112Pb2+1ρPb2+Pb2+Table1ParametersofadsorptionkineticsofdifferentinitialconcentrationforPb2+onnitrifiedaerobicgranulesρPb2+mgLQemggk1min－1Ｒ2Qemggk2gmg·minＲ2kPmgg·min0.5ImggＲ2ＲC%204.13050.09420.914319.34240.24751.00002.60335.9390.666030.7064017.64410.09350.932939.21570.01891.00004.484110.9880.739228.0196026.16980.07600.948549.75120.01080.99995.783812.0340.805824.188ＲC．ＲC23．ＲC=100IQeＲC．1ρPb2+ＲC30.706%、28.019%、24.188%50%ＲCρPb2+Pb2+ρPb2+ρPb2+ρPb2+Pb2+．2.37．LangmuirFreundlich2．2FreundlichLangmuir2425℃Q079.58mggPb2+．℃1—252—353—45．7ρPb2+Pb2+Fig.7EffectsoforiginalconcentrationonadsorptionofPb2+atdifferenttemperaturesLangmuirＲL12ＲL=