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1、摘要每一个城市都应该具备一套完整可靠的污水排放处理系统,以保证城市各项功能的正常运转。因此,省YSC市的排水工程设计包括了三个主要的部分:污水管网设计,雨水管网设计及污水处理厂的设计。其目的是让本专业的学生对所学的知识有一个全面系统的了解。省YSC市地势西北高东南低,坡向城市东侧的自北向南流向的河流,该城东西高差20米。夏季主导风向是西南风。城市中部被一条铁路分成两个区,两个区的人口密度有所不同。污水管道与雨水管道沿地形布置以减小埋深,节省造价。污水处理厂位于河流的下游,以避免污染上游水源。污水厂日处理水量1488L/s,污水处理过程分为一级处理和二级处理。在一级
2、处理过程中,固体颗粒从水中去除,二级处理过程中,污水中95%的有机物被去除。污水处理厂采用的处理工艺是传统的活性污泥法,活性污泥法工艺已经发展成熟,并具有处理程度高,负荷高,占地面积少,设备简单等优势。目前我国大部分污水处理厂采用此工艺,即污水经过格栅间由泵抽至沉砂池后送至初沉池,再经曝气池曝气后进入二沉池,并在二沉池沉淀,最后处理后的污水达到排放标准后排入水体。另外,污泥经浓缩,消化后压缩成泥饼运出厂外作为其他使用。污水经过处理后,水质得以改善,均达到排放标准,保证公民饮用水的卫生及公民的正常生活。关键词:排水管网;雨水管网;污水处理工艺;活性污泥法环境影响Ab
3、stractEverycityshouldhaveacompleteandreliablesewagetreatmentsystemtoensurethatthecityofthenormaloperationofvariousfunctions.Therefore,thecityofLiaoningProvince,YSCdrainageengineeringdesignincludesthreemaincomponents:thesewagepipenetworkdesign,thedesignofrainwaterpipenetworkandsewagetr
4、eatmentplantdesign.Itspurposeistoallowstudentstheknowledgetohaveacomprehensiveunderstandingofthesystem. YSCCity,LiaoningProvince,thehigh-lyinglowintheeast-west,eastslopecitiesfromnorthtosouthflowoftherivers,thecity20meterseast-westelevation.Summerdominantwinddirectionissouth-westwin
5、d.Thecentralcitybyarailwayisdividedintotwoareas;twoareashavedifferentpopulationdensities.Sewersandstormwaterpipesalongthelayouttoreducethedepthoftheterrain,thecostsavings. Sewagetreatmentplantislocatedinthelowerreachesofriversinordertoavoidpollutionofwaterresourcesupstream.Onwater,w
6、astewatertreatmentplanttodealwith1488L/s,thesewagetreatmentprocessisdividedintoprimarytreatmentandsecondarytreatment.Intheprimarytreatmentprocess,thesolidparticlesremovedfromthewater,secondarytreatmentprocess,95%ofsewageorganicmatterwasremoved.Sewagetreatmentplantusedintraditionalproc
7、essisactivatedsludge,activatedsludgeprocesshasbeendevelopedandhavetodealwithahighdegreeofhigh-load,smallarea,suchasadvantagesofsimpleequipment.Atpresent,mostsewagetreatmentplantsinChinausingthistechnology,thatis,bythegridaftersewagepumpingafterthegritchamberandsenttotheprimarysediment
8、ation