基于污水厂运行数据的低温生物脱氮强化研究_杨小丽

基于污水厂运行数据的低温生物脱氮强化研究杨小丽1,叶峰2,宋海亮3,王阿华2(1.东南大学土木工程学院,江苏南京210096;2.南京市市政设计研究院有限责任公司,江苏南京210008;3.东南大学能源与环境学院,江苏南京210096)摘要:基于太湖流域8家城镇污水处理厂的实际运行数据,结合动力学分析,探讨了低温生物脱氮的强化措施。动力学分析表明:温度对硝化、反硝化效果的影响较大,温度每降低1℃,硝化菌比增长速率和反硝化速率分别降低10%和9%。当污水厂的污泥负荷≤0.12kgBOD5/(kgMLSS·d)、泥龄≥12d时,出水NH3-N全面达标(GB18918—2002一级B)。当BOD5/TN≤3时,对TN的去除效果与碳氮比呈显著正相关;而当BOD5/TN>3时,碳氮比对TN的去除效果影响较小,但此时对TN的去除效果与对NH3-N的去除效果呈显著正相关;约有50%的污水厂因原水碳源不足影响反硝化效果。最后提出了太湖流域城镇污水厂实现低温脱氮的优选参数及强化运行管理的措施。关键词:污水厂运行数据;生物脱氮;低温;动力学;强化措施中图分类号:X703文献标识码:C文章编号:1000-4602(2009)01-0082-05EnhancedBiologicalNitrogenRemovalatLow-temperatureBasedonOperationDataofWastewaterTreatmentPlantsYANGXiao-li1,YEFeng2,SONGHai-liang3,WANGA-hua2(1.SchoolofCivilEngineering,SoutheastUniversity,Nanjing210096,China;2.NanjingMunicipalDesignandResearchInstituteCo.Ltd.,Nanjing210008,China;3.SchoolofEnergyandEnvironment,SoutheastUniversity,Nanjing210096,China)Abstract:BasedontheoperationdataofeightmunicipalwastewatertreatmentplantslocatedintheTaihubasin,theenhancedbiologicalnitrogenremoval(BNR)underlow-temperaturewasstudiedbykineticsanalysis.Theresultsshowthattemperaturehasalargeeffectonnitrificationanddenitrification.Whentemperaturedecreasesby1℃,themultiplicationrateofthenitrifyingbacteriaandthedenitrifyingratedecreaseby10%and9%,respectively.Undertheconditionsofsludgeloading≤0.12kgBOD5/(kgMLSS·d)andsludgeretentiontime≥12d,theeffluentNH3-NmeetsthefirstlevelBcriteriaspecifiedinDischargeStandardofPollutantsforMunicipalWastewaterTreatmentPlant(GB18918-2002).WhenBOD5/TN≤3,theremovalefficiencyoftotalnitrogen(TN)ispositivelycorrelatedwiththeratioofBOD5/TN.However,whenBOD5/TN>3,theBOD5/TNratiodoesnotaffectTNremoval,buttheTNremovalefficiencyispositivelycorrelatedwiththeNH3-Nremovalefficiency.AboutonehalfofwastewatertreatmentplantshavepoorBNRcapabilityduetotheinsufficiencyofcarbonsourceintheinfluent.Theoptimumparametersandtheenhancedmeasuresforoperationmanagementareputforwardtoovercomethenegativeeffectsonnitrogenremovalunderlowtemperature.Keywords:operationdataofwastewatert