木质填料床AO系统处理低CN比养猪废水的效能与脱氮机制

第66卷第11期2015年11月化工CIESC学报Journal、，01．66No．11November2015麓；j00：≥3}；≥；0≥：木质填料床。系统处理低C／N比养猪废水的效能与脱氮机制谢荣，赵博玮，李建政，邓凯文(哈尔滨工业大学城市水资源与水环境国家重点实验室，黑龙江哈尔滨150090)摘要：针对干清粪式养猪废水NH：浓度高和低C／N比的特点构建了四格室木质填料床A／O处理系统，通过调控运行探讨其除氮效能和机制。结果表明，在HRT18．7h、32~C、硝化液回流比200％、好氧区DO1．5mg·L等条件下，即便进水NH：高达307．7mg·L～，COD／TN平均为0．47，系统对COD、NH：和TN的去除率仍能维持在66．5％、93．6％和89．0％左右，TN去除负荷达到0，22kg·rn-·d-以上。系统对COD和TN的去除表现出一定的空间分区特征，其中前三厌氧格室是去除COD主要功能区，末端好氧格室是脱氮功能区。系统的脱氮机制以短程硝化反硝化为主，枯木填料的腐解为反硝化提供了必要的碳源。关键词：养猪废水；低C／N比；固定床；厌氧；曝气；脱氮；碳源；短程硝化DOI：10．11949~．issn．0438—1157．20150544中图分类号：X703．1文献标志码：A文章编号：O438—1157(2015)11—4661—08TreatmentofpiggerywastewaterwithlowC／Nratioandmechanismfordenitrificationinwood—packed-bedoprocessXIERong，ZHAOBowei，LIJianzheng，DENGKaiwen(StateKeyLaboratoryofUrbanWaterResourceandEnvironment，HarbinInstituteofTechnology，Harbin150090，Heilongjiang,China)Abstract：Manure—freepiggerywastewaterislowinCODbuthighinNH：concentrationwithaCOD—to-TNfcm)ratiolessthan1．Inordertoremovalnitrogenfromthewastewatereficaciously,awood-packed-bedA／0processwithfourcompartmentswasconstructedanditsperformanceinpollutantremovalwasevaluated，especiallythedenitrification．ThereactorwasoperatedatHRTl8．7hand32℃withanintemalrecycleratioof200％andDO1．5mg·Linthe1astcompartment．ThetreatmentprocesswasstarteduDwithdilutedrawwastewaterinwhichCOD／TNratiowasregulatedtoabout3．9．entheprocessperformedsteady,thedilutionrateoftherawwastewaterwasdecreasedstagebystage．synchronizingwithC／Nratio．ⅥmentheprocesswassteadyinthelaststageevenfeedingtherawwastewaterwithahighNH：ofabout307．7mg·LandaCOD／TNratioaslowas0．47，theremovalofCOD，NH：andTNwasaveragedoutabout66。5％，93．6％and89．0％，respectively．AloadremovalofTNabove0．22。m-。d-wasobtained．ThefourcompartmentshadillustrateddifferenceinpollutantremovalwithatotalCODremovalofabout78_3％inthefrontthreeanaerobiccompartmentsandaTNremova1ofabout73．1％inthelastaerobiccompartment．TNremovalinthereactorwasmainlyattributedtotheshortcutnitrification—denitrificationprocesswiththepackedwoodastheinternalcarbonS0l】rCe．2015．04—30收