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1摘要环境保护是我国的基本国策。世界经济发展的实践证明，为实现经济的持续稳定的发展，必须解决好发展与环境保护的矛盾。随着我国社会和经济的高速发展，城市环境污染特别是水污染的问题日趋严重。目前我国水污染控制的重点已从以工业点源为主，逐步转变为以城市污水污染为主的控制。本文即为浙江省A市某污水处理工程的设计计算，在分析进出水水质之后，结合当地的水文及气候条件，本设计选用传统活性污泥工艺进行处理。传统活性污泥法是当前应用最为广泛的污水处理技术之一。该方法自1914年在英国曼彻斯特市建成污水试验厂以来，已有80多年的历史。它是以活性污泥为主体的污水生物处理方法，构成传统活性污泥法有3个基本要素：—是引起吸附和氧化作用的微生物，即活性污泥；二是废水中的有机物，它是处理对象，也是微生物的食料；三是溶解氧，没有充足的溶解氧，好氧微生物既不能生存也不能发挥氧化分解作用。本文详细计算了传统活性污泥工艺的各处理构筑物，也进行了污水及污泥高程布置及基本的成本概算。关键词：城市污水处理厂传统活性污泥工艺污水处理污泥处理2AbstractEnvironmentalprotectionisthebasicstatepolicyofourcountry.Thepracticeofworldeconomicdevelopmenthasprovedthatwemustsolvethecontradictionbetweendevelopmentandenvironmentalprotectioninordertoachievesustainedandstableeconomicdevelopment.WiththerapiddevelopmentofsocietyandeconomyinChina,theproblemsofurbanenvironmentalpollution,especiallywaterpollution,arebecomingmoreandmoreserious.Atpresent,thefocusofwaterpollutioncontrolhasbeenmainlyfromindustrialpointsources,andgraduallychangedtourbansewagepollutionbasedcontrol.ThispaperisthedesignandcalculationofasewagetreatmentprojectinAcityofZhejiangprovince.Afteranalyzingthewaterqualityofimportedandexportedwater,combinedwiththelocalhydrologicalandclimaticconditions,thisdesignusesthetraditionalactivatedsludgeprocess.Thetraditionalactivatedsludgeprocessisoneofthemostwidelyusedwastewatertreatmenttechnologies.Themethodhasbeenbuiltsince1914inManchester,England,andhasbeentestedformorethan80yearsinwastewatertreatmentplants.Itisthemainactivityofthesludgeofthewastewatertreatmentmethod,aconventionalactivatedsludgemethodhas3basicelements:thefirstiscausedbytheadsorptionandoxidationofmicroorganisms,namelyactivatedsludge;thesecondisthe3organicinthewastewatertreatment,itisalsotheobjectofmicrobialfood;thethirdisnotdissolvedoxygen,dissolvedoxygentheadequacyoftheaerobicmicroorganismscanneithersurvivalcannotplaytheoxidativedecomposition.Inthispaper,varioustreatmentfacilitiesoftraditionalactivatedsludgeprocessarecalculatedindetail,andthesewageandsludgeelevationarrangementandbasiccostestimatearealsocarriedout.Keyword:Municipalwastewatertreatmentplant;traditionalactivatedsludgeprocess;wastewatertreatment;sludgetreatment.4目录第一章概论.................................................................................................................11.1城市概况......................................................................................................11.2自然概况......................................................................................................11.3设计依据......................................................................................................31.4设计任务与内容..........................................................................................41.5基本要求......................................................................................................4第二章浙江A市排水管网的设计及计算..............................................................52.1排水系统的规划设计原则..........................................................................52.2排水系统体制的确定..................................................................................62.3污水管道系统的设计..................................................................................62.4管网水力计算............................................................................................102.5雨水管道设计............................................................................................11第三章污水处理厂设计.........................................................................................133.1处理流程的选择........................................................................................133.2污水处理程度的确定................................................................................163.3污水处理构筑物的设计计算....................................................................17第四章污水处理厂平面及高程的布置...................................................................574.1污水厂平面布置........................................................................................574.2污水厂高程布置........................................................................................59第五章污水总泵站.................................................................................................65污水泵房的工艺流程：.............................................................................................655.1格栅............................................................................................................655.2泵站设计的主要参数................................................................................685.3初选水泵....................................................................................................695.4水泵校核，计算一条管路水头损失........................................................735.5泵站尺寸和泵基础尺寸............................................................................755.6泵站布置....................................................................................................76结束语.........................................................................................................................781第一章概论1.1城市概况本工程为浙江A城市排水工程，为中等城市。该市有一条河流沿城流过，并有铁路、公路