化学沉淀微滤法处理含铬电镀废水实验研究张志军

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—,,,,(,213164)[]—,pHCr(OH)3,,,FeSO4。、Cr6+pH、。:,《》(GB21900—2008)。[];;[]X703.1[]A[]1005-829X(2011)12-0070-03Experimentalstudyonthetreatmentofelectroplatingwastewatercontainingchromiumbychemicalprecipitation-micro-filtrationprocessZhangZhijun,LiuDongfei,QinJing,ChenZhengsheng,HuJuan(DepartmentofEnvironmentalandSafetyEngineering,ChangzhouUniversity,Changzhou213164,China)Abstract:Chemicalprecipitation-micro-filtrationmembraneprocesshasbeenappliedtothetreatmentofelectro-platingwastewatercontainingchromium.BasedonpHadjustment,Cr(OH)3precipitationisformed.Togethighertreatmenteffectiveness,micro-filtrationmembranesareusedfortreatingthesupernatantandremovethechromiumflocculatedbyFeSO4.Theeffectsofthefactors,i.e.thedosageofreducingagent,Cr6+recoveredpHandaerationratewhilemicro-filtrationmembranetreatmentiscarryingon,onthetreatmenteffectivenessareinvestigated.Theresultsindicatethatmicro-filtrationmembranecanremovethechromiumfromtheelectroplatingwastewatertreatedbychemicalprecipitation.TheeffluentwaterqualityreachesthespecialareaandregionalfirstclassofEmissionStan-dardofPollutantsforElectroplating(GB21900—2008).Keywords:chemicalprecipitation;micro-filtration;electroplatingwastewaterCr17m3〔1〕,Cr,Cr6+,〔2〕。Cr,,Cr+3,Cr3+Cr(OH)3。Cr(OH)3Cr6+〔3〕。2008《》(GB21900—2008),。,。FeSO4,。FeSO4,Cr6+Cr3+,pHCr(OH)3,,Fe(OH)2、Fe(OH)3,Cr3+、Cr6+Cr(OH)3,,,,0.1μm,,Cr。1,pH=1.75,Cr59mg/L,Cr6+36.8mg/L。1.1:novAA300,;,;A6410,。:、、3112201112IndustrialWaterTreatmentVol.31No.12Dec.,201170,,。:K2Cr2O7500mg/L,。1.2FeSO4Cr、pH、;;—。Cr6+Cr,Cr,Cr6+,Cr。:FeSO42500mg/L,pH=5,pH=10,150mg/L,,。22.1FeSO4·7H2OCr6+Cr6+Cr3+,m(FeSO4·7H2O)∶m(Cr6+)=16∶1,FeSO4·7H2O〔4〕,m(FeSO4·7H2O)∶m(Cr6+)=20∶1,Cr3+。,m(FeSO4·7H2O)∶m(Cr6+)=20∶1。2.2pHCr6+Cr,Cr2O72-CrO42-,,〔5〕。m(FeSO4·7H2O)∶m(Cr6+)=20∶1,pH,pHCr6+,,pH≈1.0,Cr3+;pH2.0~4.0,,Fe(OH)3;pH≈4,98%Cr6+Cr3+,Cr3+,Cr6+;pH>5,CrO42-,Cr2O72-,Cr6+。pH3.5~5.0。2.3pHm(FeSO4·7H2O)∶m(Cr6+)=20∶1,pH3.5~5.0,Cr6+Cr3+,pH,Cr3+Cr(OH)3,pH。:pH<4,Cr+3;pH>4Cr(OH)3。pH,pH>10Cr(OH)3,Cr(OH)3,pHCr(OH)3。,Cr3+,pH≈9,pH≈9。2.4Cr6+Crm(FeSO4·7H2O)∶m(Cr6+)=20∶1,pH3.5~5.0,pH≈9,Cr6+,Cr6+Cr,1。1Cr1,Cr6+0~400mg/L,Cr,,CrFeSO4。2.50.1μmCrCr6+100mg/L600mL,pH3.5~5.0,m(FeSO4·7H2O)∶m(Cr6+)=20∶1FeSO4·7H2O,200r/min20min,,pH≈9,5~10min,30min,0.1μm,Cr6+Cr。,Cr6+、Cr0.12、2.1mg/L,0.1μm,Cr6+,Cr,0.44mg/L,0.1μmFeCr6+、Cr3+、Cr(OH)3。2.6Cr2.5,,2011-12,31(12),:—71Cr2。2Cr,,〔6〕。0.2m3/h,Cr,,,,,。,0.2m3/h。3—,3,,1。31mg/L1,Cr,Cr6+Cr《》(GB21900—2008)。4—:m(FeSO4·7H2O)∶m(Cr6+)=20∶1,,pH3.5~5.0,pH≈9,0.1μm,0.2m3/h,10min。,Cr6+、Cr99.8%、98%,。[][1],,.[J].,2001,23(5):17-19.[2],.[J].,2004,37(12):40-45.[3]KozlowskiCA,WalkowiakW.Removalofchromium()fromaqueoussolutionsbypolymerinclusionmembranes[J].WaterResearch,2002,36(19):4870-4876.[4],.[J].,2005,23(3):32-34.[5],.[J].,2004,17(3):38-40.[6].MBR[D].:,2005.[](1973—),2004,,,。:13585345809,E-mail:zzj73@em.jpu.edu.cn。[]2011-09-30()Cr6+36.800.140.100.5Cr590.380.261.52011-12,31(12),、、。:,,。+3,。:,,;,pH;;;。≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈≈———,.CN102153176··72

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