污水处理厂溶解氧自动控制系统的运行优化_马金峰

污水处理厂溶解氧自动控制系统的运行优化马金峰,王佳伟,张胜海,甘一萍,刘立超(北京城市排水集团有限责任公司,北京100022)摘要:生化反应池曝气量的自动调节是污水厂节能降耗的重要手段。介绍了广州市西朗污水处理厂溶解氧自动控制系统的运行优化经验,指出控制鼓风机出口压力解决喘振现象是实现溶解氧自动控制的必要前提。研究了基于压力控制的鼓风机喘振控制方法和基于PID调节的溶解氧控制方法,得到了PID控制器的主要参数设定值:比例增益、微分增益、积分动作时间、响应临界值分别为1.0、5.0、200ms、10%。运行表明,鼓风机的出口压力稳定在0.070～0.073MPa,好氧一段和好氧二段的溶解氧分别控制在(1.2±0.3)mg/L和(1.0±0.3)mg/L,有效避免了鼓风机的喘振,实现了对溶解氧的稳定控制。提出并试验了基于出水氨氮控制的低溶解氧运行策略,好氧一段和好氧二段的溶解氧设定值分别为0.7～1.3mg/L和0.7～1.9mg/L,与传统的溶解氧控制值(2～3mg/L)相比节能效果较为明显。关键词:污水处理厂;溶解氧;自动控制;鼓风机;氨氮中图分类号:X703文献标识码:A文章编号:1000-4602(2010)11-0017-04基金项目:国家科技支撑计划项目(2006BAC19B01)OperationOptimizationofDissolvedOxygenAutomaticControlSysteminWastewaterTreatmentPlantMAJin-feng,WANGJia-wei,ZHANGSheng-hai,GANYi-ping,LIULi-chao(BeijingDrainageGroupCo.Ltd.,Beijing100022,China)Abstract:TheautomaticregulationofaerationrateinbiochemicaltankisanimportantmeansforenergysavingandconsumptionreductioninWWTP.TheexperienceinoperationoptimizationofdissolvedoxygenautomaticcontrolsysteminGuangzhouXilangWWTPwasintroduced.Solvingthesurgingphe-nomenonofblowerbycontrollingoutletpressurewasemphasizedasaprerequisitetoachieveautomaticcontrolofdissolvedoxygen.TestsonblowersurgecontrolbasedonpressurecontrolanddissolvedoxygenstabilitycontrolbyPIDadjustmentwerecarriedout.ThemainsettingparametersforPIDcontrollerwereobtained,includingproportionalgainof1.0,differentialgainof5.0,integralresponsetimeof200msandcriticalresponsevalueof10%.Theoperationresultsshowthatwhenthebloweroutletpressurestabi-lizesat0.070to0.073MPa,andthedissolvedoxygeninthefirstandsecondaerobiczonesiscontrolledat(1.2±0.3)mg/Land(1.0±0.3)mg/Lrespectively,theblowersurgecanbeeffectivelyavoided,andthestablecontrolofdissolvedoxygencanbeachieved.Anoperationstrategyonlowdissolvedoxygencontrolbasedonammonianitrogenintheendofaerobiczonewasproposed.Thedissolvedoxygeninthefirstandsecondaerobiczonesiscontrolledatarangeof0.7to1.3mg/Land0.7to1.9mg/L,andmoreenergyissavedcomparedwiththetraditionaldissolvedoxygencontrolvalueof2to3mg/L.·17·第26卷第11期2010年6月中国给水排水CHINAWATER＆WASTEWATERV