DO 浓度对 生活污水 硝化过程中N_2O 产生量的影响
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2020-04-30 09:24:07
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第29卷第3期2008年3月环境科学ENVIRONMENTALSCIENCEVo1.29.No.3Mat.,2008DO浓度对生活污水硝化过程中N2O产生量的影响刘秀红,彭轶,马涛,刘春慧,彭永臻(1.哈尔滨工业大学市政环境工程学院,哈尔滨150090;2.北京工业大学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,青岛266033)摘要:为确定污水脱氮过程中最优的DO浓度和曝气方式,以提高污水处理效率,降低N,O产生量,采用实际生活污水应用小试SBR反应器,重点考察了不同DO浓度条件下,硝化效率和硝化过程中N,O的产生量.结果表明,当DO浓度恒定为0.4mg·L时,虽然硝化过程所消耗的能量最低,但其氨氮氧化的速率较低.提高DO浓度,氨氮氧化速率可随之升高.低氨氮生活污水硝化过程中仍有NO产生.DO浓度为0.4mg·L和0.9mg·L时,污水N,O产生量(以N计)分别为1.5mg·L和1.6g·L~;而DO浓度为1.5mg·L和2.0mg。L时,N2O产生量则分别降低至0.5mg·L和0.4g·L~.当DO浓度高于1.5mg·L后,继续提高DO浓度,氨氮氧化速率升高的速率变缓,同时NO产生量大幅降低.因此,从提高污水脱氮效率节能降耗和控制NO产生量2个角度考虑,生活污水脱氮过程中控制DO浓度在1.5mg·L较为适宜.关键词:N,O产生量;DO浓度;生活污水;硝化作用中图分类号:X703.1文献标识码:A文章编号:0250.3301(2008)03—0660.05EfectsofDoConcentrationonN2OProductionDuringNitrificationforTreatingDomesticWastewaterLIUXiu.hong,PENGYi,MATao,LIUChun.hui,PENGYong.zhen'(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China;2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022,China;3.SchoolofEnvironmentalandMunicipalEngineering,QingdaoTechnologicalUniversity,Qingdao266033,China)Abstract:Inordertoreducenitrousoxide(N20)productionfromrealwastewaterandoptimizetheDOconcentrationandtheaerationmode,nitrificationeficiencyandN2Oproductionfr0mnitrificationtreatingdomesticwastewaterunderdifferenceDOconcentrationswereinvestigatedusinglab—scaleSBR.TheobtainedresultsshowenergyconsumptionwassavedatDOconcentrationof0.4mg。L~,whereas,ammoniaoxidationratewasverylow.AmmoniaoxidationratewasincreasedwithDOincreasing.N2Owasproducedduringthenitrificationfortreatingdomesticwastewaterwithlowammoniumconcentration.N20productionattheDOconcentrationof0.4mg·L‘and0.9mg。L~were1.5mg。L~and1.6mg。L~,respectively.WhileN2OproductionattheDOconcentrationof1.5mg。L~and2.0mg。L~were0.5mgL‘and0.4mg。L。。,respectively.WhenDOconcentrationincreasedabove1.5mg’L~,theammoniaoxidationrateincreasedslightlywithN2Oproductionsharplydecreasing.Therefore,fromtheaspectsofenhancingtheeficiencyo
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