除镉最佳混凝剂的筛选及应用条件研究韩志勇

3711201211ENVIRONMENTALSCIENCEANDMANAGEMENTVol.37No.11Nov．20122012－08－08—2012090481976－。1674－6139201211－0108－05韩志勇1，张燕1，庞志华2，王彦闻31．7300502．5106553．710064通过采用聚合氯化铝铁(PAFC)、氯化铁(FeCl3)及聚合硫酸铁(PFS)对含镉废水的处理研究表明，三种混凝剂对含镉水体均有良好的处理效果，同等条件下，三种混凝剂对含镉水体去除率分别为98.22%、92.19%和93.63%。研究了PAFC对含镉水体的混凝沉淀效果，实验结果表明:碱性条件有利于镉离子的沉淀，当pH为9～11时，去除率可达98.00%左右;对于初始浓度为4.0000mg·L－1的含镉废水，经处理后，水体浓度可降至0.1840mg·L－1，对于初始浓度为0.4000mg·L－1的含镉废水，经处理后水体浓度降至0.0072mg·L－1;废水中投加一定量的石灰乳对PAFC除镉起一定的作用，投加量达30.00mg·L－1时，其去除率达99.91%;通过对PAFC除镉动力学拟合，符合一级线性动力学方程。镉;聚合氯化铝铁;影响因素;动力学X522AScreeningandApplicationConditionofOptimalCadmiumRemovingCoagulantHanZhiyong1ZhangYan1PangZhihua2WangYanwen31．PetroleumInstituteofChemicalLanzhouUniversityofTechnologyLanzhou730050China2．SouthChinaInstituteofEnvironmentalSciencesGuangzhou510655China3．CollegeofEarthScienceandResourcesChang'anUniversityXi'an710064ChinaAbstractThisstudiesconductedprecipitationexperimentontheinfluenceofpolymericaluminumferricchlorideironchlo-ridesandpolyferricsulphateoncadmium－containingwastewater．Thedatashowedthatallthreecoagulantsachievegoodresultswithremovingratesof98.22%92.19%and93.63%respectively．Precipitationeffectofpolymericaluminiumferricchlorideoncadmiumwasstudied．Theresultsindicatedthatalkalineconditionisbeneficialtoprecipitationofcadmiumions．Theremovingrateisupto98%whenthepHis9－11．Forwastewaterwithinitialconcentrationof4.0000mg·L－1theconcentrationofwa-terbodiesreducedto0.1840mg·L－1afterprecipitation．Forinitialconcentrationof0.4000mg·L－1theconcentrationofwaterbodiesdroppedto0.0072mg·L－1afterprecipitation．Certainamountoflimemilkplayedalargeroleinthetreatmentwhenthedosageis30.00mg·L－1theremovingrateis99.91%．Bymeansofkineticfittingthatpolymericaluminumferricchlorideinfluenceoncadmiumcorrespondingpseudofirstorderequation．Keywordscadmiumpolymericaluminumferricchlorideinfluencingfactorkinetic“”。、、。20051、200622012。3－7、、、、8－11。·801·3711201211·Vol.37No.11Nov．2012。、、、。12－13。－OH14。PAFC15－17。、、PAFCpH、、、、。11．11000.0mg·L－1、、、、。1．2NaOHHClpH150r·min－15min150r·min－13min40r·min－130min90min2～3cm。22．1100ml3.0000mg·L－1200mlpH9500mg·L－11.2100ml。1。PFAC。1/mg·L－1/mg·L－1/%PFAC3.00000.053498.223.00000.052898.243.00000.053898.21FeCl33.00000.234392.193.00000.235092.173.00000.233492.22PFS3.00000.191493.623.00000.190393.663.00000.192193.602．2pHPFAC1pHpH。pH2.11。1pH。KspCdOH2=5.27×10－15pH18。H+Cd2+pH19Cd2+。pH7H+。·901·3711201211·Vol.37No.11Nov．2012pH=9～11H+98%。pH9。2．3PFACPFAC2.1PFAC。240min0.1277mg·L－1。。80min0.0317mg·L－1100min0.0307mg·L－199.02%。。80min。2PFAC2．4PFACpH92.1。33PFAC99%。50mg·L－1～300mg·L－1。50mg·L－1100mg·L－1。300mg·L－1Ca2+。PAFC。300mg·L－1。3PFAC2．5PFAC2.1。PFAC440.8mg·L－1～3.2mg·L－198%。3.2mg·L－1～4.0mg·L－1。0.4mg·L－198.21%4.0mg·L－195.40%。Cd2+。42．6PFAC2.1·011·3711201211·Vol.37No.11Nov．201210℃～60℃PFAC。55。52．7PFAC2.1PFAC。2。2lgCit66PFAC。lgCi=lgC0－ktCitC0k。tt7。7PFAC。2/min152025303540/mg·L－10.04350.02520.01920.01060.00730.0041/L·mg－1－3.1350－3.6809－3.9528－4.5469－4.9199－5.4968631、、98.23%、92.19%、93.63%。2pHpH392.56%97.97%pH9～11。3780min。80min。4。595%。610℃～60℃。·111·3711201211·Vol.37No.11Nov．2012。7。1．J．20063266－14．2．J．200827474－78．3NunesM．AssessmentofwaterqualityintheCaimaandMauriverBasinsPortugalusinggeochemicalandbiologicalindicesJ．WaterAirandSoilPollution20031496227－250．4CaeiroSCostaMHRamosTBeta1．AssessingheavymetalcontaminationinSadoEstuarysediment－Anindexa-nalysisapproachJ．EcologicalIndicators20055151－169．5HülyaKAErhanU．HeavymetalconcentrationsinwatersedimentfishandsomebenthicorganismsfromTigrisRiverTurkeyJ．EnvironMonitAssess2007131323－337．6ChenJSWangFYXiaXHeta1．MajorelementchemistryoftheChangJiangYangtzeRiverJ．ChemicalGe-ology2002187231－255．7KhazheevaZIUrbazaevaSDBodoevNVetal．HeavymetalsinthewaterandbottomsedimentsoftheSelengaRiverDeltaJ．WaterResources200431164－67．8．J．2002438－41．9．J．200632814－17．10．J．200734228－30．11．J．200733115－7．12．M．2002．13．J．20063266－12．14．J．2009251186－88．15．J．20019429－11．16．J．199818517－20．17．、J．199717215．18．．J．200221213－16．19．－J．2005197檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾30－33．(上接第95页)。1．J．1997175453－4612．J．1995152113－120．3．J．2003143535－539．4．J．2005272128－133．5．———、、M．200012．6．3SJ．200929350－52．7．J．20103181409－1414．8．J．2010393307－312．9．J．201083287－292．10．J．20036212－15．11．J．20102159－163．·211·