电絮凝用于焦化废水脱色的研究张垒

:　(1978-),,,,。张　垒1,薛改凤1,张　楠1,刘尚超1,段爱民2,刘　璞1(1.,430080;2.,430083)　:,、pH、。UV-Vis。,,30mA/cm2,pH8.0,1.0cm,0.5g/L,25℃80min91%。:;;;:X703.1　:A　:1008-4371(2011)05-0026-04StudyondecolorizationofcokingwastewaterbycontinuouselectrocoagulationprocessZHANGLei1,XUEGai-feng1,ZHANGNan1,LIUShang-chao1,DUANAi-min2,LIUPu1(1.R&DCenterofWISCO,Wuhan430080,China;2.WugangPingmeiJointCokingCo.Ltd.,Wuhan430083,China)Abstract:Thedecolorizationandchemicaloxygendemand(COD)reductionofcokingwastewaterhasbeencarriedoutbyelectrocoagulationprocess.Inthemeanwhileeffectsofoperatingparameters,suchascurrentdensity,pHofsolution,electrolyteconcentra-tionandhydraulicresidencetime(HRT)ondecolorizationbycontinuouselectrocoagula-tionarefurtherstudiedinordertooptimizeprocessperformance.TheUV-Visspectrumdataprovesthatorganicpollutantsofthecokingwastewatercanbeeffectivelydegradedanddecolorizedbyelectrocoagulation.Resultsshowthattheeffectsofelectrocoagula-tionprocessonthedecolorizationofthecokingwastewaterareobviousandupto91%ofcolorremovalefficiencyisobtainedafter80minreactionat25℃withacurrentdensityof30mA/cm2,apHof8.0,anelectrodedistanceof1.0cmandasupportingelectro-lyteconcentrationof0.5g/L.Keywords:continuouselectrocoagulation;cokingwastewater;operatingparameters;decolorization　　、、、、、、[1-3]。、COD,,。,,、[4-5]。,。,(GB8978-1996),,,,,。,。26　　　2011　10　　　495WISCOTECHNOLOGY　　Oct.2011Vol.49　No.5,[6]。,,,[7]。。1　1.1　材　料。A/O,1。1　pHCOD/(mgL-1)BOD5/(mgL-1)/(mgL-1)/times7.0±0.2101±1023±55.3±0.5128±106.0～9.01003015.050:(GB8978-1996)NaOH、HCl、NaCl,。。1.2　实验步骤1。41∶1,,××10cm×10cm×0.1cm。,2.0L,4,,1.;2.;3.;4.;5.;6.;7.;8.;9.;10.;11.1　、。pHHClNaOH,。10ml254nm、。1.3　分析方法UV-Vis(UV-2450,);pHpH(pHS-3B,);COD:(COD571,)。。(CRE)。CRE=(A0-AtA0)×100%(1)(1),CRE,A0,At254nm。2　2.1　电流密度对脱色效果的影响,[8]。2。,,Fe2+,1[9]。,,。60mA/cm290mA/cm2,,,、,[9]。、。,。2　　　:Fe(s)+6H2O(l)→Fe(H2O)4(OH)2(aq)+2H++2e-(2)275　,:　　　:Fe(H2O)4(OH)2(aq)→Fe(H2O)4(OH)2(s)(3):2H++2e-→H2(g)(4):Fe(s)+6H2O(1)→Fe(H2O)4(OH)2(s)+H2(g)(5)2.2　初始pH对脱色效果的影响pH。3pH,40%80%。,pH10,。,pH4,Fe2+Fe3+。Fe3+Fe(OH)2+;pH4～9,Fe2+(OH)-,Fe(OH)2+、Fe(OH)3。Fe(OH)n(s)(n=1～3)[10];pH10,Fe(OH)n(s)(n=1～3)Fe(OH)-4。,、Fe(OH)n(s)(n=1～3)[11]。,,pH8.0。3　pH2.3　电解质盐对脱色效果的影响NaCl。,Cl-、SO2-4、NO-3SCN-。4。,NaCl。Cl-,Cl2(HClO,ClO-)[12-13](2)。Daneshvar[14],。2Cl-→Cl2+2e-(6)Cl2+H2O→HClO+H++Cl-(7)HClO→H++ClO-(8)4　2.4　水力停留时间对脱色效果的影响5。,,、,。6。,275nm,。,Fe2+、Cu2+、Cr3+Mn2+。,、5　。,30min,(GB8978-1996)。28　　　　496　3　　。、pH、。,,、。,。,、。[][1]　BRLim,HYHu,KFujie.Biologicaldegradationandchemicaloxidationcharacteristicsofcoke-ovenwastewater[J].WaterAirSoilPollut.,2003,146(1-4):23-33.[2]　JWang,XQuan,LWu,etal.Bioaugmentationasatooltoenhancetheremovalofrefractorycompoundincokeplantwastewater[J].ProcessBiochem.,2002,38(5):777-781.[3]　PLai,HZhao,MZeng,etal.Studyontreatmentofco-kingwastewaterbybiofilmreactorscombinedwithzero-valentironprocess[J].J.Hazard.Mater.,2009,162(2-3):1423-1429.[4]　SEnes.OptimizationandmodelingofdecolorizationandCODreductionofreactivedyesolutionsbyultrasound-as-sistedadsorption[J].Chem.Eng.J.,2006,119(2-3)175-181.[5]　BMerzouk,BGourich,ASekki,etal.Studiesonthede-colorizationoftextiledyewastewaterbycontinuouselec-trocoagulationprocess[J].Chem.Eng.J.,2009,149(1-3):207-214.[6]　MYAMollah,PMorkovsky,JAG.Gomes,etal.Fun-damentals,presentandfutureperspectivesofelectrocoagu-lation[J].J.Hazard.Mater.2004,114(1-3):199-210.[7]　HHsing,PChiang,EChang,etal.ThedecolorizationandmineralizationofAcidOrange6azodyeinaqueousso-lutionbyadvancedoxidationprocesses:Acomparativestudy[J].J.Hazard.Mater.,2007,141(1):8-16.[8]　MYA.Mollah,RSchennach,JRParga,etal.Electro-coagulation(EC)-scienceandapplications[J].J.Hazard.Mater.,2001,84(1):29-41.[9]　IASengil,MahmutOzacar.ThedecolorizationofC.I.ReactiveBlack5inaqueoussolutionbyelectrocoagulationusingsacrificialironelectrodes[J].J.Hazard.Mater.,2009,161(2-3):1369-1376.[10]AEYilmaz,RBoncukcuoglu,MMKocakerim,etal.Theinvestigationofparametersaffectingboronremovalbyelectrocoagulationmethod[J].J.HazardMater.,2005,125(1-3):160-165.[11]THKim,CPark,EShin,etal.Decolorizationofdis-perseandreactivedyesbycontinuouselectrocoagulationprocess[J].Desalination,2002,150(2):165-175.[12]XZhu,JNi,PLai.Advancedtreatmentofbiologicallypretreatedcokingwastewaterbyelectrochemicaloxidationusingboron-dopeddiamondelectrodes[J].WaterRes.,2009,43(17):4347-4355.[13]KYetilmezsoy,FIlhan,ZSapci-Zengin,etal.Decoloriza-tionandCODreductionofUASBpretreatedpoultryma-nurewastewaterbyelectrocoagulationprocess:Apost-treatmentstudy[J].J.Hazard.Mater.,2009,162(1):120-132.[14]NDaneshvar,AOladegaragoze,NDjafarzadeh.Decolori-zationofbasicdyesolutionsbyelectrocoagulation:Anin-vestigationoftheeffectofoperationalparameters[J].J.Hazard.Mater.2006,129(1-3):116-122.(:2011-04-07)“”,,,。、,。,,。,,。(摘自《世界金属导报》)295　,: