含氰含铬电镀废水处理技术的研究张学洪

:1006-6780(1999)06-0027-04张学洪,吕炳南,冯令艳(,150090):、,-,,pH,,,。:;;:X703.1:AResearchonthetreatmentmethodofelectroplatewastewatercontainingcyanogenandchromiumcompoundZHANGXue-hong,LUBing-nan,FENGLing-yan(SchoolofMunicipalEnvironmentalEngineering,HarbinUniversityofCivilEngineeringArchitecture,Harbin150090,China)Abstract:Basedonthestudyofwastewatercontainingcyanogenandchromiumcompoundproducedfromtheprocessofthemakingofelectroplate,thepaperadvancesthenewmethodofcyanogenre-movalandchromiumremovalbymeansofchemicalmethod.Atthesametime,suiableparameterswereestablished.Resultsofasmall-scaletestandafull-scaletestshowthatcyanogenandchromiumcanberemovedefficientlyintheprocess.CyanogenandchromiumconcentrationsarelowerthanthoseinthewastewaterdischargestandardsofChina.Keywords:electroplatewastewater;cyanogenremoval;chromiumremoval0前言、,。、、、,[1]。、。,-,;,、pH。-[2]。,6000,30%,,,,,。1废水水质与工艺流程1.1:(1);(2);(3);(4)。:1999-05-28:(1963-),,.326哈尔滨建筑大学学报Vol.32No.6199912JournalofHarbinUniversityofC.E.ArchitectureDec.199928哈尔滨建筑大学学报322,,240m3,1。11.21。:1.,、,,pH,;2.,,;3.,。2试验结果与分析2.1-,Cr6+Cr3+,,Cr3+。Cr2O27-+14H+6Fe2+=2Cr3++6Fe3++7H2OCr3++3OH-=Cr(OH)3↑Fe3++3OH-=Fe(OH)3↑2.1.1Cr6+=24.8mg/L,,2,2。2Fe2O3Al2O3SiO2GaOMgO(%)4.9028.3049.801.801.503.002.1.21296张学洪等:含氰含铬电镀废水处理技术的研究1.pHCr6+=24.8mg/L6,FeSO4:Cr6+=20:1FeSO4,H2SO4,Cr6+pH,3。pH4.1,Cr6+Cr3+。3pHCr6+pH6.25.54.44.13.93.5Cr6+(mg/L)1.782.070.800.460.370.32(%)81.392.796.798.298.598.7Cr6+24.8mg/L6,FeSO4:(FeSO4:Cr6+=20:1),H2SO4pH=4.1,pH,Cr3+,4,pH=8.2～8.4Cr3+。4pHCr3+pH7.57.88.08.28.48.6Cr3+(mg/L)4.721.780.840.400.390.302.Cr6+24.8mg6,H2SO4pH=4.1,FeSO4,Cr6+,5,∶FeSO4:Cr6+=20:1,Cr6+Cr3+。5FeSO4Cr6+3.Cr6+24.5mg/L6,FeSO4∶Cr6+=20:1FeSO4,H2SO4pH=4.1,,Cr3+,6,,:Cr6+≈30～35∶1,Cr3+。6Cr3+:Cr6+15∶120∶125∶130∶135∶140∶1Cr3+(mg/L)5.82.70.840.360.340.30,,FeSO4Cr6+=20:1,pH=4.1,:Cr6+≈30～35:1,pH=8.2～8.4,,Cr6+0.5mg/L,Cr3+99%,0.5mg/L。2.22.2.1,,CN-N2CO2,[3]::pH=10～11,CN-CNO-,10～15min。:pH=7.5～8,CNO-N2CO2,Cu2+,Ni2+Zn2+,10～15min。3。2.2.2CN-,15min,pH,()。3CN-FeSO4:Cr6+101518202530Cr6+(%)83.692.086.099.399.599.830哈尔滨建筑大学学报32CN-23.0mg/L,6,NaOHpH=10.5,,5min,10min,CN-,7。:CN-11∶1,CN-。7CN-CN-8.09.010.011.012.013.0CN-(%)91.496.198.299.799.799.83结论1.,,-,,pH,。2.:,FeSO4∶Cr6+=20∶1,pH=4.1,;,:Cr6+=30～35∶1,pH=8.2～8.4。3.:pH=10～11,:CN-=11∶1,,15min;,H2SO4pH=7.5～8.0,:CN-=11∶1,,15min。4.Cr3+,,;,,,,、。:[1].[M].:,1992.[2].[J].,1998,(2):132.[3].[J].,1988,(1):4-5.:,。,。。,CORσeq=Corσ++σ-,,Cauchy。[3,4]。