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本科毕业设计说明书题目：聊城市冠县污水管网和污水处理厂的设计院（部）：市政与环境工程学院专业：给水排水工程班级：水工姓名：学号：指导教师：完成日期：2012.6摘要本次设计为聊城市冠县污水管网和污水处理厂的设计。设计人口密度为360cap/ha，污水量标准为140L/（cap·d），污水管网遍布整个城区，污水管网全长46.69公里，污水管网服务面积977.27公顷。根据城区地形等因素，确定确定污水主干管和干管。经过水力计算，最大埋设深度为7.88m，最大管径为DN1300，管材采用钢筋混凝土。污水处理厂位于聊城市冠县东南部。污水处理量75000m3/d，占地75364m2。根据进、出水水质及脱氮除磷的要求，采用A-A-0曝气池工艺，其处理流程为：进水→粗格栅→泵站→细格栅→沉砂池→初沉池→A-A-0曝气池→二沉池→混合→过滤→消毒→出水。出水水质基本《城镇污水处理厂污染物排放标准》（GB18918-2002）中的一级A标准。管网总投0.59亿元，污水处理厂总投资为1.2亿元，处理水成本为0.747元。关键词：污水管网；污水处理；A-A-O；脱氮除磷ABSTRACTThisisadesignofwastewatertreatmentplant&wastewaterpipenetworkforliaochengcity.Thepopulationdensityofthisdesignis360cap/haandthewastewaterdischargequotais140L/(cap·d).Thedrainagepipenetworkbasicallycoversalloverthetown.Thewholelengthofthewastewaterpipenetworkisabout46.69kmandtheserviceareaofthenetworkisabout977.27hectares.Accordingtothelandformoftheliaochengcity,thepipenetworkschemesarecompleted.Hydrauliccalculationshowedthatthemaximalburialdepthofthepipenetworkis7.88mandthemaximaldiameterofpipesisDN1300.Thereinforcedconcretepipesareadoptedinthisdesign.Thewastewatertreatmentplantliesinthesoutheastofliaochengguanxian.Thedisposedscaleofwastewatertreatmentplantis75000m3/danditsareaisabout753642m.Accordingtothedemandofnitrogenandphosphorusremoval,alsothequalityoftheinfluentandeffluent,A-A-O.Thetreatmentprocessisasfollow:InfluenCoarsegrid→Pumpinghouse→Thingrid→Gritchamber→Anaerobicpond→A-A-O→Secondarysedimentationtank→tertiarywastewatertreatment→Effluent.ThequalityoftheeffluentwouldreachthestandardⅠ-Aofthe《Dischargestandardofpollutantsformunicipalwastewatertreatmentplant》(GB18918-2002).KeyWords:Wastewaterpipenetwork;Wastewatertreatment;A-A-O;nitrogenandphosphrousremoval摘要........................................................................................................................................................................IABSTRACT.............................................................................................................................................................I第一章毕业设计任务及要求...........................................................................................................................-1-1.1毕业设计任务.........................................................................................................................................-1-1.2毕业设计原始资料..................................................................................................................................-1-第二章聊城市冠县城区排水管网设计...........................................................................................................-3-2.1排水管网的规划和布置..........................................................................................................................-3-2.1.1排水管网的规划............................................................................................................................-3-2.1.2排水管网的布置..........................................................................................................................-3-2.1.3管网定线和敷设............................................................................................................................-3-2.2排水管网的设计流量计算.....................................................................................................................-5-2.2.1污水总设计流量的确定..............................................................................................................-5-2.2.2设计管段及各管段的设计流量的确定.......................................................................................-5-2.3污水管网的水力计算.............................................................................................................................-7-2.3.1污水管道设计参数.........................................................................................................................-7-2.3.2管道的水力计算............................................................................................................................-9-2.3.3污水管道的衔接........................................................................................................................-10-第三章污水厂设计规模及工艺流程.............................................................................................................-12-3.1污水厂厂址的选择以及工艺流程的选择.........................................................................................-12-3.1.1污水厂厂址的选择....................................................................................................................-12-3.1.2污水处理流程选择....................................................................................................................-12-3.1.3方案论证......................................................................................................................................-13-3.1.3.1生物接触氧化方案................................................................................................................................-13-3.1.3.2A2/O方案.............................................................................................................................................-1