低负荷城市污水厂的运行问题与对策_温荣平

运行与管理低负荷城市污水厂的运行问题与对策温荣平1,卢东昱2,郭伟3,徐国勋4(1.中冶东方工程技术有限公司,河北秦皇岛066004;2.北京恩菲环保股份有限公司,北京100038;3.北京师范大学环境学院,北京100875;4.上海理工大学环境与建筑学院,上海200093)摘要:针对南方城市污水厂普遍存在的进水水质偏低的问题,结合A2/O工艺处理低浓度污水的实际运行情况,具体分析了低负荷形成的原因和运行中存在的问题,提出了优化运行的方案。实际运行中好氧池MLSS由设计值的3.5g/L下调至2.5g/L,采用曝气链间隔运行(按4h周期启闭曝气链)和关闭内回流系统的运行模式后,实际污泥负荷为0.07kgBOD/(kgMLSS·d),污泥性状得到有效改善。优化后的运行结果表明,好氧池的溶解氧变化幅度由4.78mg/L降至0.82mg/L,活性污泥中有机物含量由48%提高至63%,出水水质优于《城镇污水处理厂污染物排放标准》(GB18918—2002)的一级B标准,综合处理电耗节省0.05kW·h/m3。关键词:城市污水厂;低负荷;优化运行;间隔曝气;污泥负荷中图分类号:X703.1文献标识码:C文章编号:1000-4602(2010)18-0144-04OperationProblemsandCountermeasuresofMunicipalWastewaterTreatmentPlantatLowOrganicLoadingWENRong-ping1,LUDong-yu2,GUOWei3,XUGuo-xun4(1.BERISEngineeringandResearchCorporation,Qinhuangdao066004,China;2.BeijingENFIEnvironmentalProtectionCo.Ltd.,Beijing100038,China;3.SchoolofEnvironment,BeijingNormalUniversity,Beijing100875,China;4.SchoolofEnvironmentandArchitecture,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China)Abstract:BasedontheproblemoflowconcentrationinfluentofwastewatertreatmentplantsinthesoutherncitiesofChina,andcombinedwiththeactualoperationconditionsofA2/Oprocesstreatinglowconcentrationwastewater,thereasonforforminglowloadingandproblemsintheoperationwereana-lyzed,andanoptimizedoperationprogramwasproposed.MLSSintheaerobictankisreducedfrom3.5g/Lto2.5g/L.Withtheoperationmodeofintermittentaerationwithopen/stopcycleof4handclosinginternalreturnsystem,theactualsludgeloadingis0.07kgBOD/(kgMLSS·d),andthecharacteristicsofsludgeareeffectivelyimproved.Theresultsofoptimaloperationmodeshowthattherangeabilityofdis-solvedoxygeninaerobictankisreducedfrom4.78mg/Lto0.82mg/L,andtheorganicmattercontentinactivatedsludgeisincreasedfrom48%to63%.TheeffluentqualityissuperiortothefirstlevelBcri-teriaspecifiedintheDischargeStandardofPollutantsforMunicipalWastewaterTreatmentPlant(GB18918-2002).Theelectricconsumptionoftheintegratedtreatmentissavedby0.05kW·h/m3.Keywords:municipalwastewatertreatmentplant;loworganicloading;optimizedoperation;intermitten