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毕业设置I摘要本次设计为江西德兴某新区的排水工程初步设计，包括排水管道的规划设计与污水处理厂设计。排水体制采用分流制，雨污分流，雨水就近排入水体，污水收集输送到污水厂进行处理后排到河流。中途设有一座污水提升泵站，将收集来的污水直接输送到污水处理厂。污水处理厂的规模为43400m3/d。污水处理厂的进水水质：CODCr=300mg/L；BOD5＝140mg/L；SS=240mg/L；TN=25mg/L；TP=3.2mg/L。处理后出水水质达到《城镇污水处理厂污染物排放标准》一级B标准。经工艺比较，采用以A2/O为主的二级生物处理工艺，主要处理构筑物有格栅、旋流沉砂池、A2/O反应池与二沉池。污泥处理工艺采用浓缩脱水一体机处理后形成泥饼外运。本次排水工程设计基建总投资为35068.04万元，污水处理厂年运行成本为1100.13万元，单位处理水费用为0.7元/m3。关键词：雨水工程；污水工程；污水厂设计；A2/O工艺毕业设置IIPreliminarydesignofdrainageengineeringinanewdistrictinDexing,JiangxiStudent:RAOLi-yongTeacher:WANGYan-wuAbstract：ThedesignforthepreliminarydesignofanewdrainageprojectinDexingarea,Jiangxiprovince,includingtheplanninganddesignofdrainagepipeanddesignofsewagetreatmentplan.Drainagesystemusingtriagesystem,rainsewagediversion,rainwaterdischargedintothenearestbodyofwater,sewagewascollectedandtransportedtothesewagetreatmentplantforprocessing.Middleisequippedwithasewagepumpingstation,thecollectionofsewagedriectlytothesewagetreatmentplant.Thescaleofsewagetreatmentplantforthe43400m3/dandsewagetreatmengplantofwaterquality:CODCr=300mg/L;BOD5=140mg/L;SS=240mg/L;TN=25mg/L;TP=3.2mg/L.Effluentqualitytoachieve“urbansewagetreatmentplantemissionstandards”Bstandard.Bycomparisonofprocess,thetwostagebiologicaltreatmentprocesswithA2/Owasadoptedandthemaintreatmentstructuresaregrid,swirlsandbasin,A2/Oreactiontankandsecondarysettlingtank.Inaddition,thesludgethickeninganddewateringmachineformedafterthetreatmentofsludgecakesinotrans.Thedrainageengineeringdesigninfrastructureinverstmentof350,680,400yuanandsewagetreatmentplantoperationcostof11,001,300yuan.Unittreatmentwatercostof0.7yuanpercubicmeter.Keywords：RainwaterProject；Sewageworks；SewageTreatmentPlant；A2/Oproces毕业设置i目次摘要……………………………………………………….…………….……………..…ⅠAbstract………………………………………………………………………………….......Ⅱ1总论................................................................................................................................11.1工程概况资料.........................................................................................................11.1.1城市概况.......................................................................................................11.1.2自然资料.......................................................................................................11.1.3水系...............................................................................................................11.2设计范围.................................................................................................................11.3设计规模.................................................................................................................11.4设计指导思想.........................................................................................................11.5设计依据.................................................................................................................22设计说明........................................................................................................................32.1排水管网设计说明.................................................................................................32.1.1雨水管网设计说明.......................................................................................32.1.1污水管网设计说明.......................................................................................32.2污水处理厂设计说明.............................................................................................32.2.1污水处理工艺................................................................................................32.2.2污水处理工艺比选.......................................................................................42.2.3污泥处理工艺选择.......................................................................................62.2.4主要构筑物设计说明...................................................................................62.2.5辅助建筑物...................................................................................................82.2.6劳动定员.......................................................................................................82.2.7主要设备一览表...........................................................................................82.3工程概算计算说明.................................................................................................93设计计算........................................................................................................................93.1排水管网设计计算.................................................................................................93.1.1污水管道设计计算.......................................................................................93.1.2雨水管道设计计算.....................................................................................113.2污水厂主体构筑物设计计算...............................................................................123.2.1设计原始资料.............................................................................................123.2.2粗格栅的设计计算.....................................................................................13毕业设置ii3.2.3污水提升泵房的设计计算.................