硝化类型对污水脱氮过程中N_2O产生量的影响_刘秀红

中国环境科学2007,27(5)：633~637ChinaEnvironmentalScience硝化类型对污水脱氮过程中N2O产生量的影响刘秀红1,彭永臻1,2∗,马涛3,尚会来2,吴昌永1(1.哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090；2.北京工业大学环境与能源工程学院,北京市水质科学与水环境恢复工程重点实验室,北京100022；3.青岛理工大学环境与市政学院,山东青岛266033)摘要：采用好氧－缺氧SBR系统,研究实际生活污水脱氮过程中N2O的产生与释放情况,重点考察硝化类型对脱氮过程中N2O产生量的影响.结果表明,实际生活污水脱氮过程中N2O主要产生于硝化阶段,而反硝化阶段有利于降低N2O产生量.硝化类型对脱氮过程中N2O产生量有显著影响.全程硝化和短程硝化过程中N2O-N产生量分别为1.87,0.90mg/L,短程硝化过程中N2O产生量远低于全程硝化过程中N2O产生量.在DO浓度不受限制的情况下,应用实时过程控制,实现短程硝化反硝化,可降低污水脱氮过程中N2O产生量.关键词：生活污水；N2O产生量；全程硝化；短程硝化；实时过程控制中图分类号：X703.1文献标识码：A文章编号：1000-6923(2007)-05-0633-05InfluenceofnitrificationtypeonN2Oproductioninnitrogenremovaltreatingdomesticwastewater.LIUXiu-hong1,PENGYong-zhen1,2*,MATao3,SHANGHui-lai2,WUChang-yong1(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China；2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,ColegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100022,China；3.SchoolofEnvironmentalandMunicipalEngineering,QingdaoTechnologicalUniversity,Qingdao266033,China).ChinaEnvironmentalScience,2007,27(5)：633~637Abstract：N2Oproductionandemissioninnitrogenremovalprocesstreatingrealdomesticwastewaterwasstudiedutilizingoxic-anoxicSBRsystem.TheinfluenceofnitrificationtypeonN2Oproductioninnitrogenremovalwasinvestigatedmainly.N2Owasmainlyproducedinnitrification,whiledenitrificationpotentiallylowerN2Oemission.N2Oproductionincompleteandshort-cutnitrificationwas1.87mg/Land0.90mg/L,respectively.Undertheconditionoftheshort-cutnitrification,N2Oproductionwasobviouslylowerthanthatinthecompletenitrification.NotcontrolofDOconcentration,applyingreal-timecontrollingtheshort-cutnitrificationanddenitrificationcouldlowertheN2Oproductioninnitrogenremovalfromdomesticwastewater.Keywords：domesticwastewater；N2Oproduction；completenitrification；short-cutnitrification；real-timecontrolN2O作为产生NO的前体物质,消耗臭氧、破坏臭氧层,对全球环境及气候变化具有重要影响[1].污水处理过程是N2O的一个重要产生源[2],硝化及反硝化过程均可能产生N2O[3-4].近年来发展起来的短程硝化反硝化工艺,具有节约能源和碳源等优点,该工艺过程中N2O的产生与释放问题已