螯合沉淀法处理电镀废水的工业实践

69Vol.6,No.920059TechniquesandEquipmentforEnvironmentalPollutionControlSep.2005(,215006),DT2CR,DTCRpHDTCR,pH8.08.5DTCR,DTCR,;DTCRX703A100829241(2005)0920083203AnindustrialpracticeofchelatingprecipitationtotreatelectroplatingwastewaterWangWenfeng(ChemistryandChemicalEngineeringCollege,SoochowUniversity,Suzhou215006)AbstractAtypicalindustrialexampleofchelatingprecipitationtotreatelectroplatingwastewaterisrepor2tedinthispaper.Intheindustrialequipment,comparisonofremovingheavymetalsamongNaOH,Na2SandDTCRhadbeencarriedout.TherelationbetweenDTCRdosageandcostoftreatmentandtheinfluenceofpHonDTCRdosagehadbeendiscussed.TheresultsshowthatwhenDTCRisjoinedinwastewaterwhilepH=8.0815,thedosageofDTCRandthecostofwastewatertreatmentisleast;theremovaleffectforheavymetalswiththistechniqueisbetterthanthatwiththetraditionalchemicalprecipitation.Keywordschelatingprecipitation;DTCR;electroplatingwastewater:2004-04-08;:2004-06-01:(1962),,,,E2mail:[e-mail],,,,,:EDTA,,,[13],2090,,DTCR,,1/5,[4],1DTCR,(,),(DTC)DTC(DTC2Ag),(DTC2CuDTC2ZnDTC2Fe)DTCR,DTC,DTCR(1015)104,,,DTCRHg2+Cd2+Cu2+Pb2+Mn2+Ni2+Zn2+Cr3+,()©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.6,22.1,,,,2000300,40t/h,,,11Fig.1Simplifiedflowchartofthewastewatertreatment2.2,24mg/L,,,pH915,,,,DT2CR,pH915810,DTCR50g/t,1,pH,DTCR2,,33.1DTCR1,pH79,1DTCRTable1ComparisonofremovingheavymetalsamongNaOH,Na2SandDTCRCu(mg/L)Ni(mg/L)Cr(mg/L)Zn(mg/L)CN-(mg/L)pH63.112.883.31200.923.143.282.851.174.310.749.5t100g0.550.950.262.350.259.5t50gDTCR0.120.180.060.230.018.0t100gDTCR0.000.030.000.020.008.0;pH10,,,,S2-OH-,,S2-,,,48©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.9:,,S2-,,S2-,,DTCR,,OH-S2-,CN-,,DTCR,,,,,DTCR3.2DTCR1,DTCR,DTCR,;,t50gDTCR,3.3pHDTCRDTCR,pH311,pH7,,pH7,pH7DTCR,DTCR,DTCR;pH7DTCR,OH-,OH-DTCR,DTCR,,,pH810815DTCR4(1),,DTCR(2)pH810815,DT2CR,DTCR,[1],..:,2000[2]..:,1989[3],,.1,2003,23(4):3335[4],11,2002,18(11):495058©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.