低温SBR反硝化过程亚硝态氮积累的动力学研究

低温SBR反硝化过程亚硝态氮积累的动力学研究孙洪伟1,彭永臻1,魏东洋2(1.北京工业大学水质科学与水环境恢复工程北京市重点实验室,北京100124;2.环境保护部华南环境科学研究所,广东广州510655)摘要:严格控制试验条件,以缺氧/厌氧UASB预处理的实际垃圾填埋场渗滤液为研究对象,考察了低温条件下SBR反硝化过程中亚硝态氮的积累。结果表明:在温度为13.5～15.5℃的低温条件下,对于4种不同的NO-3-N初始浓度(64.9、54.8、49.3、29.5mg/L),NO-2-N均实现了明显积累,最大积累浓度分别为37.8、21.5、25.2、18.9mg/L。在反应过程中,ORP曲线先后出现“硝酸盐膝”和“亚硝酸盐膝”两个拐点,指示NO-3-N和NO-2-N还原反应的结束。对于有明显亚硝态氮积累的反硝化过程,仅以NO-3-N作为反硝化速率的单值函数是不准确的,应以总氧化态氮(NO-x-N=NO-2-N+NO-3-N)计,如仅以NO-3-N为底物,则应定义为“名义反硝化速率”。关键词:垃圾渗滤液;SBR;反硝化;低温;亚硝态氮积累中图分类号:X703文献标识码:C文章编号:1000-4602(2011)05-0099-05基金项目:“十一五”国家科技支撑计划重点项目(2006BAC19B03);北京市教委科技创新平台项目(PXM2008014204050843)DynamicsofAccumulationofNitriteNitrogenduringDenitrificationinSBRatLowTemperatureSUNHong-wei1,PENGYong-zhen1,WEIDong-yang2(1.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China;2.SouthChinaInstituteofEnvironmentalSciences,MEP,Guangzhou510655,China)Abstract:Underthestrictly-controlledexperimentalconditions,theaccumulationofnitritenitro-genduringthedenitrificationofactuallandfillleachatewhichwaspre-treatedbyanoxic/anaerobicup-flowanaerobicsludgebed(UASB)wasinvestigatedinalab-scalesequencingbatchreactor(SBR)atlowwatertemperatures.TheexperimentalresultsshowthatatfourdifferentinitialNO-3-Nconcentra-tionsof64.9,54.8,49.3and29.5mg/L,anobviousaccumulationofnitritenitrogenisachievedinSBRundertheconditionsoflowerwatertemperatureof13.5to15.5℃.Themaximumaccumulationconcentrationsare37.8,21.5,25.2and18.9mg/Lrespectively.Duringtheaccumulationofnitriteni-trogen,twobreakpointsof“nitrateknee”and“nitriteknee”ontheoxidationreductionpotential(ORP)profileindicatethatthenitratereductionreactionandnitritereductionreactionarecompleted,respective-ly.Forthedenitrificationwithobviousaccumulationofnitritenitrogen,itisnotaccuratethatnitrateni-trogenisonlyusedasthesoleparameterofthedenitrificaionrate.Thenitratenitrogenplusnitritenitro-·99·第27卷第5期2011年3月中国给水排水CHINAWATER＆WASTEWATERVol.27No.5Mar.2011genshouldbeused.Itshouldbenamedasnomin