电化学氧化与厌氧技术联用处理垃圾渗沥水_王鹏

电化学氧化与厌氧技术联用处理垃圾渗沥水王鹏1,刘伟藻2,方汉平2(1.哈尔滨工业大学环境科学与工程系,哈尔滨150001,E-mail:pwang73@yahoo.com;2.香港大学土木工程系,香港)摘要:采用电化学氧化与上流式厌氧污泥床(UASB)结合技术,提出了处理香港垃圾渗沥水的二步法工艺.对含COD和NH3-N分别为4750mg/L和1310mg/L的垃圾渗沥水,首先进行UASB预处理(消化温度37℃,COD负荷0.78g/(L·d),HRT为6.1d),获得了66%的COD去除率;UASB的出水被引入电化学氧化反应器进行深度处理.在外加Cl-2000mg/L,电流密度为32.3mA/cm2的条件下,经6h的电解间接氧化,COD和NH3-N的去除率分别达到87%和100%,出水的COD为209mg/L,并且不含NH3-N,此过程的COD电能消耗<55kW·h/kg.本文讨论了电化学氧化过程中电极反应原理,各实验参数对COD和NH3-N去除率的影响,以及电能消耗与运行成本评估等.关键词:电化学氧化;UASB;渗沥水;氨氮;COD;氯化物中图分类号:X705文献标识码:A文章编号:0250-3301(2001)05-04-0070基金项目:香港政府研究基金资助项目(7098/99E)作者简介:王鹏(1957～),男,博士,教授,博导.主要从事难降解有机污染物化学氧化处理等研究.收稿日期:2001-01-05LandfillLeachateTreatmentbyAnaerobicProcessandElectrochemicalOxidationWangPeng1,LauIvanWC2,FangHerbertHP2(1.DepartmentofEnvironmentalScienceandEngineering,HarbinInstituteofTechnology,Harbin,150001,China,E-mail:pwang73@yahoo.com;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-sumptionwas<55kW·h/kgCOD.ThefinaleffluentcontainednoresidualNH3-Nandonly209mg/LofCOD.Inthispaper,somebasicproblemsinelectrochemicaloxidation,suchastheeffectsoftheoperationparameters,themech-anismoftheprocess,andassessmentoftheenergyrequirementswerediscussedindetail.Keywords:electrochemicaloxidation;UASB