电镀废水的铬污染特征及调控林文杰

33521041、CrFeSO4Cr6+Cr3+Cr。CrCr6+57.3mg/L、42.4mg/L37、83Cr6+。pH。CrCr、。FeSO4Cr6+Cr3+Fe2+/Cr6+4pH9Cr3+Cr。X131.2Adoi10.3969/j.issn.1003-6504.2010.08.0361003-6504(2010)08-0156-03CharacteristicsandControlofCrPollutioninElectroplatingWastewaterLINWen-jieHanshanNormalUniversityChaozhou521041ChinaAbstractDistributioncharacteristicsofCrintheelectroplatingwastewaterandsedimentswereinvestigatedinCaitangTownChaozhouCityGuangdongProvince.FeSO4wasusedtoreduceCr6+andCr3+wasprecipitatedandremovedbycontrolledpHvalueinelectroplatingwastewaterintheexperiment.ResultsshowedthatCrandCr6+concentrationsintheelectroplatingwastewaterwere57.3mg/Land42.4mg/Lexceedingelectroplatingwastewaterdischargestandardby37and83timesrespectivelywhichresultedinCr6+instreamexceedingsurfacewaterstandard.TherewerelowpHvalueandhighconductivityintheelectroplatingwastewater.Crconcentrationsinthesedimentsinelectroplatingareasweremuchhigherthanbackgroundvalue.ConcentrationsofCrinthesedimentsweredominatedbyresidualfractionfollowedbyoxidizablefractionandreduciblefraction.ThesequentialgeochemicalextractiontestshowedthatthesedimentshadlowmobilityandbioavailabilityforCr.Cr6+couldbereducedintoCr3+byferroussulphateandreductionefficiencywashighestat4oftheratioofFe2+andCr6+.CrintheelectroplatingwastewatercouldberemovedmosteffectivelyatpHvalue9afterCr6+wasreducedbyferroussulphate.KeywordselectroplatingwastewaterCrpollutionferroussulphatespeciation、、Cr。CrCr。CrDNA[1－2]。CrCrCrCr。CrCrCrCr。。CrCrCrCr。[e-mail]。EnvironmentalScience&Technology33820108Vol.33No.8Aug.20108355。31。1.2CrCrFe2+/Cr6+2、3、41、2、37pH。FeSO420minNaOHpH4、5、6、7、8、9~10CrCr6+3pHCr6+Cr。1.3PHB-1000pHDDS-ACrCr[3]。100HCl-HNO3-HClO4CrTessierSims[4-5]1。Cr、Cr。22.12、、CrCr。。CrCr57.3、42.4mg/L37、83[6]。Cr4.4。1Table1Proceduresofsequentialextractionforsediments11g8mL1mol/LMg(NO3)2(pH=7)25℃1h。28mL1mol/LNaOAC(pH=5)25℃5h。320mL0.04mol/L(NH2OH-HCl)25%dHAc96℃6h。43mL0.02mol/LHNO35mL30%H2O2HNO3pH285℃3h3mL30%dH2O2pH2。。5mL3.2mol/L20%HNO3,20mL30min。5HCl-HNO3-HClO4。2Table2CharacteristicsofwaterbodiesinelectroplatingareaspHEC(μs/cm)Cr(mg/L)Cr6+(mg/L)(n=3)0.93±0.1643467±606157.3±7.942.4±3.5(n=5)5.34±0.56412±1090.36±0.090.27±0.07(n=3)6.53±0.27137±200.12±0.030.06±0.01(GB3838-2002)[6]6~90.05GB21900-2008[7]1.50.52.2CrCr320%。CrCr。Cr、、。[8][9]。CrCr。2.34FeSO4pHCr6+Cr。FeSO4Cr6+。1Fe2+/Cr6+2Cr6+50%1Fe2+/Cr6+2Cr6+98%。1Cr6+2Cr6+[6-7]。3Cr6+99.9%。Cr6+FeSO4pHCr6+。33CrCr6+Cr3+CrCr6+Cr3+。CrpH4~5pHCrpH9CrpH10Cr。pH4~5CrpH6~9Cr3+OH-CrOH3。pH10CrCrCrOH3Cr[10]。23pH7~9Cr1pH7~921mg/LCr6+Cr6+pH。3CrCr6+CrCr6+。Cr。Cr、、Cr。FeSO4Cr6+Cr3+pH7~9Cr3+CrCr6+。Fe2+Cr6+3。[][1].DNA[J].———200633297-100.XiaoJing-weiLiBinZhongCai-gao.Progressinmecha-nismsofDNAinjurybyCr6+[J].ForeignMedicalSciencesSectionHygiene200633297-100.inChinese[2]KuykendallJRKyleLMMellIngerKNetal.WaterborneanddietaryhexavalentchromiumexposurecausesDNA2proteincrosslinkDPXformationinerythro-cytesoflarge-mouthbass[J].AquaticToxicology20067827-31.[3].[M].4.2002.WeiFu-sheng.MonitoringMethodsofWaterandWastewater[M].4thed.BeijingChineseEnvironmentalPress2002.inChinese[4]SimsJT,KlineJS.Chemicalfractionationandplantuptakeofheavymetalsinsoilsamendedwithco-compostedsewagesludge[J].JEnvironQual,1991,20387-396.[5]TessierACampbellPGCBissonM.Sequentialextractionprocedureforthespeciationofparticulatetracemetals[J].AnalyticalChimicaActal1979517844-851.[6]GB/3838-2002,[S].GB/3838-2002,QualityStandardforSurfaceWater[S].inChinese[7]GB/21900-2008,[S].GB/21900-2008,EmissionStandardofPollutantsforElec-troplating[S].inChinese[8]HarrisonRMLaxenDPHWilsonSJ.Chemicalassociationsofleadcadmiumcopperandzincindustsandroadsidesoils[J].EnvironSciTechnol198115129-158.[9]MannoEVarricaDDongarraG.MetaldistributioninroaddustsamplescollectedinanurbanareaclosetoapetrochemicalplantatGelaSicily[J].AtmosEnviron2006405929-5941.[10].[J].200831796-98ZhangZhi-junLiLingZhuHongetal.Removingchromiumfromelectroplatingwastewaterbychemicalprecipitation[J].EnvironmentalScience&Technology200831796-98.inChinese3CrTable3ConcentrationsofCrinvariousgeochemicalfractionsofsedimentsCr(mg/kg)11.570.6018.9433.1839.9494.2105.121.810.8421.1127.8730.7782.478.631.810.8438.7322.3237.76101.5100.340.840.8431.0111.4676.86121.0126.951.090.6015.0817.4920.6354.964.50.220.450.160.155.676.665.764pHCr6+CrTable4RemovalefficienciesofCr6+andtotalCrbyFeSO4underdifferentpHvalues(mg/L)pHCr6+Cr123123422.50.460.0852.549.550.2522.40.660.0550.245.943.2621.50.250.1036.56.77.21719.20.350.0624.51.050.96819.30.450.0622.40.950.44919.30.770.0821.30.870.481021.90.410.0731.91.511.17Mean20.870.480.0734.215.2114.78