电化学氧化与厌氧技术联用处理垃圾渗沥水王鹏

1,2,2(1.,　150001,E-mail:[e-mail];2.,):(UASB),.CODNH3-N4750mg/L1310mg/L,UASB(37℃,COD0.78g/(L·d),HRT6.1d),66%COD;UASB.Cl-2000mg/L,32.3mA/cm2,6h,CODNH3-N87%100%,COD209mg/L,NH3-N,COD55kW·h/kg.,CODNH3-N,.:;UASB;;;COD;:X705　　:A　:0250-3301(2001)05-04-0070:(7098/99E):(1957～),,,,..:2001-01-05LandfillLeachateTreatmentbyAnaerobicProcessandElectrochemicalOxidationWangPeng1,LauIvanWC2,FangHerbertHP2(1.DepartmentofEnvironmentalScienceandEngineering,HarbinInstituteofTechnology,Harbin,150001,China,E-mail:[e-mail];2.CentreforEnvironmentalEngineeringResearch,DepartmentofCivilEngineering,TheUniversityofHongKong,HongKongSAR,China)Abstract:Thisstudywasconductedtodevelopatwo-stageprocessofUASBandelectrochemicaloxidationforthetreat-mentofHongKongleachate.Theleachate,containing4750mg/Lofchemicaloxygendemand(COD)and1310mg/Lofammoniacalnitrogen(NH3-N),wasfirsttreatedinaUASB(upflowanaerobicsludgeblanket)reactorat37℃.Theprocessremovedonaverage66%ofCODwith6.1daysofhydraulicretentiontime(HRT),correspondingtoanorganicloadingrateCODof0.78g/(L·d).TheUASBeffluent,whichhadanaveragepHof8.9,CODof1610mg/LandNH3-Nof1480mg/L,wasthenfurthertreatedbyelectrochemicaloxidationinabatchreactorwithrecircula-tion.Withtheadditionof2000mg/Lofchloride(intheformofsodiumchloride)andatacurrentdensityof32.3mA/cm2,87%ofCODand100%ofNH3-NwereremovedfromtheUASBeffluentinsixhours.Theenergycon-sumptionwas55kW·h/kgCOD.ThefinaleffluentcontainednoresidualNH3-Nandonly209mg/LofCOD.Inthispaper,somebasicproblemsinelectrochemicaloxidation,suchastheeffectsoftheoperationparameters,themech-anismoftheprocess,andassessmentoftheenergyrequirementswerediscussedindetail.Keywords:electrochemicaloxidation;UASB;leachate;ammoniacal-nitrogen;COD;chloride　　,,.(,),,[1].680,9500t,3.,(30d),,.22520019　　　　　　ENVIRONMENTALSCIENCEVol.22,No.5Sept.,2001DOI:10.13227/j.hjkx.2001.05.016.,(UASB)[2],UASB.UASB,CODNH3-N,.1　(),12mm,(40mm),SnO2,,265ml.2L,(0.5L/h),,,.(32.2mA/cm2).,COD,BOD5NH3-N(APHA)(1985);(LC-10).2　2.1　UASB1UASB(269～354d).,UASB,;pH1.0pH;BOD5COD96%66%,BOD5COD0.06.UASB,.1　UASB1)/mg·L-1Table1　CharacteristicsofrawleachateandUASBeffluentUASBpH7.9±0.48.9±0.3COD4750±5101610±170BOD52270±19091±25NH3-N1310±1201480±1501890±302010±40　1)UASB:(COD)0.78g/(L·d);HRT6.1d2.2　,..Cl-,.:2Cl-※Cl2+2e-(1)6HClO+3H2O※2ClO-3+4Cl-+12H++1.5O2+6e-(2)2H2O※O2+4H++4e-(3):2H2O+2e-※2OH-+H2(4)ClO-+H2O+2e-※Cl-+2OH-(5):Cl2+H2O※HClO+Cl-+H+(6)HClO※H++ClO-(7)　　,(1)(4),,(2)(5),.,.,32.2mA/cm20.5L/h.SnO2,(90%),(3),.,pH.(1)　,.2:,,;,HClO[(1)(6)].UASB,2010mg/L(1),CODNH3-N(1).,Cl-.Cl-,UASB6h,50.5%COD55.4%NH3-N;Cl-2000mg/L,87%100%.Cl-(4000mg/L).,2000mg/L.(2)　H2O2CODNH3-N715　　　　　　1　COD(pH8.9)Fig.1　EffectsofchlorideconcentrationatinitialpH8.9onCODremovalandammonia-Nremoval.,,,,;H2O2,.2,,COD36%47%(5h),NH3-N;H2O2COD47%,NH3-N47%53%.2,,Cl-CODNH3-N54%89%.,“”[3],NH3-N.(3)pH　,pH8.910.06h,NH3-N86%～90%COD;pH7.5,86%76%(3).,Cl2O2,Cl-※Cl2※ClO-※Cl-,,;,NH3-N,[3,4];,ClO-3[(2)].ClO-3,,.,,pH.,UASB(1),pHUASB.2　COD(pH6.0)Fig.2　EffectsofaddingoxidationenhanceratinitialpH6.0onCODremovalandammonia-Nremoval3　pHCODFig.3　EffectsofinitialpHonCODremovalandammonia-Nremoval2.3　4.,1h,UASB84%,;4～6h,72　　　　　　2258%.,4～6hCOD55kW·h/kg(5);,,COD80kW·h/kg.10h,,UASBCOD91kW·h/kg.,,UASB,COD.6h,4,Cl-2,UASB(kW·h/m3),2.4　Fig.4　Currentefficiencyofelectrochemicaloxidation5　Fig.5　Energyconsumptioninelectrochemicaloxidation2　UASBTable2　CostevaluationofelectrolysistreatmentofUASBeffluentofleachate/mg·L-1/kW·h·m-3Cl-2000mg/LNH3-N200190(COD450)1)390(COD400)NH3-N～0210(COD200)COD500180(NH3-N250)350(NH3-N350)COD200210(NH3-N～0)　1)CODNH3-N　　,COD200mg/LNH3-N,210kW·h/m3.,[5～7].3　UASB,37℃,HRT6.1d,0.78g/(L·d),COD66.1%.UASB(pH8.9,CODNH3-N1610mg/L1480mg/L),Cl-2000mg/L32.3mA/cm26h,CODNH3-N87%100%.COD55kW·h/kg,COD209mg/L,NH3-N,.,,,.致谢:Croucher,.:1　WangPeng,LauIWC,FangHHP.LandfillleachatetreatmentwithcombinedprocessofUASBandFentonCoag-ulation[J].J.Environ.Sci.&Health,2000,A35(10):1981～1988.2　FangHHP,ChuiHK.MaximumCODloadingcapacityinUASBreactorat37℃[J].J.Environ.Eng.,ASCE,1993,119(1):103～119.3　,,.[J].,2000,20(4):289～291.4　BenefieldLD,JudkinsJF,WeandBL.Processchemistryforwaterandwastewatertreatment[M].NewJersey:Pren-tice-Hall,EnglewoodCliffs,1982.102.5　CossuR,PolcaroAM,LavagnoloNC,PalmasS.Treat-mentofMSWlandfillleachatebyelectrochemicaloxidation[A].LeachateandLandfillGasManagement[C].Proceed-ingsSardinia97,TheSixthInternationalLandfillSympo-sium,1997.463～474.6　ChiangLC,ChangJE,WenTC.Electrochemicaltreatabil-ityofrefractorypollutantsinlandfillleachate[J].Hazard.Waste&Hazard.Mat.,1995,12(1):71～82.7　ChiangLC,ChangJE,WenTC.Indirectoxidationeffectinelectrochemicaloxidationtreatmentoflandfillleachate[J].WaterResearch,1995,29(2):671～678.735