生活污水短程生物脱氮过程中N_2O的产生与控制方法_刘秀红

中国环境科学2011,31(Suppl.)：30~34ChinaEnvironmentalScience生活污水短程生物脱氮过程中N2O的产生与控制方法刘秀红1,鞠然1,刘立超1,杨庆2*,甘一萍1,常江1,彭永臻2(1.北京城市排水集团有限责任公司科技研发中心,北京100124；2.北京工业大学水质科学与水环境恢复工程重点试验室,北京100124)摘要：为降低和控制实际污水处理厂中N2O产生量,通过长期试验和间歇试验对SBR法实际生活污水全程及短程脱氮过程中N2O的主要产生源和影响因素进行了研究.结果表明:生活污水短程硝化反硝化过程中有N2O产生,并且N2O主要产生于短程硝化过程中,即氨氧化过程中,而反硝化作用没有N2O产生,且能够将氨氧化结束时,活性污泥中累积的溶解性N2O进一步还原为N2.短程硝化过程中,N2O产生量随进水氨氮浓度的升高而显著增加.DO浓度对N2O的产生与释放有重要的影响,DO浓度高于2mg/L和低于0.5mg/LN2O产生量均较低.DO低于0.5mg/L时,一方面,降低了曝气作用对N2O的吹脱,延长了N2O在活性污泥中的停留时间;另一方面,在活性污泥絮体内部形成缺氧区,促进了同步硝化反硝化,在硝化作用的同时,加强了反硝化作用对N2O的还原作用,利于N2O的减量控制.关键词：生活污水；N2O；产生源；控制方法中图分类号：X703.1文献标识码：A文章编号：1000-6923(2011)S0-0030-05N2Osourcesandcontrolmethodsduringnitrogenremovalfromdomesticwastewater.LIUXiu-hong1,JURan1,LIULi-chao1,YANGQing2*,GANYi-ping1,CHANGJiang1,PENGYong-zhen2(1.ResearchandDevelopmentCenter,BeijingDrainageGroupLimitedLiabilityCompany,Beijing100124,China；2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China).ChinaEnvironmentalScience,2011,31(Suppl.)：30~34Abstract：ToreduceandcontrolofN2Oproductionduringwastewatertreatmentplant,bothlong-termandbatchtestswerecarriedouttoinvestigatemainsourceandpathwayofN2OproductionduringnitrogenremovalvianitritefromrealdomesticwastewaterinSBR.N2Owasproducedduringnitrogenremovalvianitritefromdomesticwastewater.N2Owasmainlyproducedduringnitritition;whereas,heterotrophicdenitrifiersdidalmostnotproducedN2O.Furthermore,anoxicdenitrificationmighthavethepotentialofreducingN2Oproduction.Duringnitritition,N2Oproductionincreasedobviouslywiththeincreaseoftheinfluentammoniaconcentration.DOconcentrationalsosignificantlyinfluencedN2Oproductionduringnitritition.N2OproductionwereverylowwhenDOconcentrationwerecontrolledhigherthan2mg/Lorlowerthan0.5mg/L.DOconcentrationlowerthan0.5mg/LreducedN2OstrippingofaerationandprolongedtheN2Oretentiontimeintheactivatedsludge.Moreover,N2OreductionwasenhancedundertheDOconcentrationslowerthan0.5mg/Lduetodenitrificationcanbeaccruedint