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2008,28(3)215~219ChinaEnvironmentalScienceA/O,,*(,,100871)Fe2(SO4)3,,pH,.,pH3~9,.,Fe2(SO4)3400mg/LpH5,DOC40.1%,COD150mg/L.,pH,.,.X703.1A10006923(2008)03021505StudyontreatmentofeffluentfromA/Ocokingwastewatertreatmentsystembyferricsulphatecoagulant.LAIPeng,ZHAOHua-zhang,NIJin-ren*(KeyLaboratoryofWaterandSedimentSciences,MinistryofEducation,DepartmentofEnvironmentalEngineering,PekingUniversity,Beijing100871,China).ChinaEnvironmentalScience,2008,28(3)215~219AbstractAdvancedtreatmentofbiologicaleffluentfromcokingwastewatertreatmentsystem(A/Oprocess)wasstudiedbycoagulationwithFe2(SO4)3.TheeffectofpHanddosagewasinvestigatedandthentheremovalmechanismoforganiccompoundswasstudied.OrganiccompoundscouldberemovedeffectivelyatpHof3~9.Furthermore,highremovalefficiencycouldbeachievedunderweaklyacidcondition.TheremovalefficiencyofDOCwas40.1%andtheeffluentCODwaslessthan150mg/Latdosageof400mg/LandatpHof5.Complexation-precipitation,complexation-adsorption,andadsorptionwerethemainmechanismsfororganiccompoundsremovalinthecoagulationprocess.UnderdifferentpHconditions,thesethreemechanismshaddifferentcontributiontotheremovaloforganiccompounds.Coagulationeffectivelyremovedthehydrophobicorganiccompoundsandthosecompoundswithmediummolecularweight,whereas,thehydrophilicorganiccompoundswaspoorlyremoved.Keywordscokingwastewaterbiologicaleffluentcoagulationmechanism.,,[12].[34].A2/O,,.[58].[911].[5,1214].,,.Fe2(SO4)3,pHFe2(SO4)3A/O,.11.1A/O,,,,pH7.0~7.8,COD20070618(20607001)*,,nijinren@iee.pku.edu.cn21628200~250mg/L,DOC70~100mg/L.Fe2(SO4)3,1054h,40g/L.30000,10000,4000,2000Da(,).XAD8,20~40,,.1.2,1L,HClpH,(200r/min)5min;(50r/min)10min,30min,NaHCO3,pHFe3+.Fe2(SO4)3,100mLFe2(SO4)3,NaOHpH9,[Fe(OH)3]100mL,pH9,24h.500mL,pH9,,.1.3CODDOCpHCOD(HACH)MultiTOC/TN3000Analyzer(AnalytikJenaAG)pH201pH(HANNA).ZetaPotentialAnalyzer(ZetaPALS,BROOKHAVEN)Zeta,1min;,[15];XAD8[1617].0.45µmpH2,XAD8,,.22.1pH1,pH5DOC,400mg/L,.0,pH1pH3DOC,pH,,.01020304050-2000200400600800Fe2(SO4)3(mg/L)DOC(%)pH1pH3pH5pH7pH91pHDOCFig.1EffectofpHanddosageonDOCremovalpH1,DOC10.0%,,DOC,20.0%;pH3,,,DOC,400mg/L,DOC,38.2%(800mg/L).pH5DOCpH3,DOCpH3,400mg/LDOC40.1%.pH7pH9,(0~200mg/L),DOC,,DOC,,,.,,[6,1820].2.2Fe3+,,[Fe(OH)3].,Fe(OH)3.2,,DOC,,3A/O217DOC,R20.9577,.10mL,DOC23.3%,.DOC=−0.0235C+82.282R2=0.957750607080901000246810(mL)DOC(mg/L)pH92DOCFig.2AdsorptioneffectofflocculantsonDOCremoval2.33,pH3~9Zeta,Fe2(SO4)3,Zeta0,,.pH3pH5,,Zeta,.H+Fe3+,Zeta.pH7pH9,,Zeta,pHFe3+Fe(OH)4.,3:.pH(pH3),Fe3+Fe3(OH)45+Fe2(OH)24+FeOH2+,Fe2(OH)24+[10].Fe3+,().,DOC.pH,.1pH1DOC,(0).pH(pH1),Fe3(OH)45+,,,DOC.pH,(),.1DOC,(pH3pH5).pH,Fe3+Fe(OH)3,.2,,.1,2,pH9DOC,,.,3pH,pH,.12,pH,,.-40-30-20-100100200400600800Fe2(SO4)3(mg/L)Zeta(mV)pH3pH5pH7pH93pHZetaFig.3EffectofpHanddosageonZetapotential218282.4,pH,pH,Fe2(SO4)3400mg/L,,DOC40.0%,COD200mg/L150mg/L,(GB897896)[21].,4.DOC80.2mg/L,10000~30000Da0~2000Da,2DOC75.0%.,30000Da.,DOC52.9mg/L,10000~30000Da0~2000Da.DOC,2000~30000Da,0~2000Da30000Da.,,.,,[22].,,,,,.5.934.26.35.728.14.72.82.821.421.2010203040503010~304~102~42(×103Da)DOC(mg/L)4Fig.4MolecularweightdistributionbeforeandaftertreatedbycoagulationFe2(SO4)3400mg/L(pH),:,DOCDOC82.6%,17.4%.,,DOC56.5%.,,DOC11.9%..4,.33.1Fe2(SO4)3,pH3~9,.Fe2(SO4)3400mg/LpH5,DOC40.1%,COD150mg/L,.3.23,pH.3.3,.[1]QianY,WenY,ZhangH.Efficiencyofpre-treatmentmethodsintheactivatedsludgeremovalofrefractorycompoundsincoke-plantwastewater[J].WaterResearch,1994,28(3):701710.[2]ZhangM,TayJH,QianY,etal.CokeplantwastewatertreatmentbyfixedbiofilmsystemforCODandNH3-Nremoval[J].WaterResearch,1998,32(2):519527.[3]AzharNG,StuckeyDC.Theinfluenceofchemicalstructureontheanaerobiccatabolismofrefractorycompounds:acasestudyofinstantcoffeewaste[J].WaterScienceandTechnology,1994,30(12):223232.[4]LiYM,GuGW,ZhaoJF,etal.Anoxicdegradationofnitrogenousheterocycliccompoundsbyacclimatedactivatedsludge[J].ProcessBiochemistry,2001,37(1):8186.[5],,,.[J].,2003,4(8):3A/O2191922.[6],,.[J].,2006,22(1):8487.[7]SongZ,WilliamsCJ,EdyveanRGJ.Treatmentoftannerywastewaterbychemicalcoagulation[J].Desalination,2004,164(3):249259.[8]ElSamraniaAG,LartigesaBS,Montargès-PelletieraE,etal.Clarificationofmunicipalsewagewithferricchloride:thenatureofcoagulantspecies[J].WaterResearch,2004,38(3):756768.[9],.[M].4.:,1999:254269.[10].[M].:,1991:2544.[11].[J].,2001,21():19.[12]JungAV,ChanudetV,GhanbajaJ,etal.Coagulationofhumicsubstancesanddissolvedorganicmatterwithaferricsalt:Anelectronenergylossspectroscopyinvestigation[J].WaterResearch,2005,39(16):38493862.[13]HuangC,ShiuH.Interactionsbetweenalumandorganicsincoagulation[J].ColloidsandSurfacesA:PhysicochemicalandEngineeringAspects,1996,113(2):155163.[14]GregorJE,NokesCJ,FentonE.OptimisingnaturalorganicmatterremovalfromlowturbiditywatersbycontrolledpHadjustmentofaluminumcoagulation[J].WaterResearch,1997,31(12):29492958.[15],,,.[J].,2007,1(3):1520.[16],,,.[J].,2006,27(5):909912.[17],,,.[J].,2005,26(1):104107.[18],,.pH[J].,2002,22(6):2931.[19]QinJJ,OoMH,KekreKA,etal.ImpactofcoagulationpHonenhancedremovalofnaturalorganicmatterintreatmentofreservoirwater[J].S