CASS工艺设计

淮阴工学院毕业设计说明书（论文）作者:张晓花学号：10316603系(院):生命科学与化学工程学院专业:环境工程题目:50000t/d城市污水处理厂CASS工艺设计指导者：马喜君讲师(姓名)(专业技术职务)评阅者：(姓名)(专业技术职务)2007年5月毕业设计说明书（论文）中文摘要本文介绍了循环式活性污泥法CASS工艺在污水处理中的应用。循环式活性污泥法是序批式活性污泥法工艺(SBR)的一种变型。它综合活性污泥法和SBR工艺特点，与生物选择器原理结合在一起，具有抗冲击负荷和脱氮除磷功能。本设计采用CASS工艺对污水处理厂进行设计计算，其中包括根据有机负荷、水力停留时间等参数的选取进行反应池池体设计，通过计算设计出格栅等辅助构筑物尺寸，并进行设备选型。处理后的水质达到一级B标准，污泥经脱水后最终堆肥处理以致不造成二次污染。因此，CASS工艺在城市污水处理中有着广泛的应用。关键词循环式活性污泥法，工艺设计，撇水器，生活污水处理毕业设计说明书（论文）外文摘要TitleThe50000t/dMunicipalWasterwaterTreatmentPlantDesignedinCASSTechnologyAbstractTheapplicationofcyclicaeratedsludgesystemCASSprocessinwastewatertreatmenthasbeenpresentedinthepaper.CyclicActivatedSludgeSystem(CASS)isatypeofmodifiedSequencingBathReactor(SBR).ItsynthesizesthecharacteristicsofactivatedsludgeprocessingandSBRincombinationwithabiologicalselector,shockloadingandfluctuationanddenificationaswellasphosphorusremovalwilltakeplacesimultaneously.CASSprocessisadoptedtocalculateanddesignawastewatertreatmentplantinthisproject,whichincludesdesigningthevolumeofthereactortanksbychoosingthevaluesofparameters,suchasorganicloading,meancellresidencetimeandsoon,designingthesizeofsomeauxiliaries,andthenchoosingsomesuitabletypesoffixture.ThequalityofeffluentaccordeswithaBstandard,thewastingsludgeafterdydratingcanbeconvertedtocompost,soasnottopollutetheenvironmentagain.Therefore,CASKeywordscyclicactivatedsludgesystem,projectdesign,decanter,wastewatertreatment淮阴工学院毕业设计说明书（论文）第Ⅰ页共Ⅰ页目录1引言···························································································································11．1我国城市污水处理要求的提出··········································································11．2我国城市污水处理概况······················································································11．3CASS工艺············································································································21．4结语·····················································································································42城市污水处理工艺设计····························································································42．1气象与水文资料··································································································42．2厂区地形··············································································································52．3污水处理工艺方案的确定··················································································53工艺流程设计计算····································································································73．1粗格栅··················································································································73．2污水提升泵房······································································································83．3泵后细格栅··········································································································93．4沉砂池················································································································103．5CASS工艺··········································································································123．6污泥浓缩池的设计计算····················································································213．7污泥脱水间········································································································233．8污泥的最终处理································································································243．9构筑物和设备一览表························································································264平面布置··················································································································274．1总平面布置原则································································································274．2总平面布置结果································································································275高程布置及计算······································································································285．1高程布置原则····································································································285．2高程布置结果····································································································285．3高程计算············································································································286经济预算··················································································································316．1工程造价估算····································································································316．2年成本费与单位处理成本的计算····································································31结论···························································································································33致谢···························································································································34参考文献···············································································································