1日处理20万吨城市生活污水处理厂设计摘要本城市污水处理厂的工程规模达20万吨/日。为使出水达到国家综合污水排放标准（GB18918-2002）一级B标准同时贯彻执行“三同时”制度，取得更好的除磷脱氮的效果，故本次设计采用处理效率较高的卡鲁塞尔2000型氧化沟处理工艺。Carrousel2000系统在普通Carrousel氧化沟前增加了一个厌氧区和绝氧区（又称前反硝化区）,全部回流污泥和10-30%的污水进入厌氧区，可将回流污泥中的残留硝酸氮在缺氧和10-30%碳源条件下完成反硝化，为以后的绝氧池创造绝氧条件。同时，厌氧区中的兼性细菌将可溶性BOD转化成VFA，聚磷菌获得VFA将其同化成PHB，所需能量来源于聚磷的水解并导致磷酸盐的释放。厌氧区出水进入内部安装有搅拌器的绝氧区，所谓绝氧就是池内混合液既无分子氧，也无化合物氧（硝酸根），在此绝氧环境下，70-90%的污水可提供足够的碳源，使聚磷菌能充分释磷。绝氧区后接普通Carrousel氧化沟系统，进一步完成去除BOD、脱氮和除磷关键词：城市污水；卡鲁塞尔2000型氧化沟；污泥浓缩脱水2Plantdesignofurbansewagetreatmentupto20tonsperdayAbstractTheplantscaleofthisprojectabouturbansewagetreatmentupto20tonsperday.TomeetthelevelBstandardofthenationalcomprehensivesewageeffluentdischargestandard(GB18918-2002)andimplementthe"threesimultaneity"system,andforthesakeoftheacquisitionbetterdividedbythephosphorustakeoffthenitrogenousresult,thisdesignwillusethetypeofCarrousel2000oxidationditchsystemswithhighefficiencytreatment.Carrousel2000systemsincreasedaoxygenDistrictbeforecommonCarrouseloxidizeditchwiththeuniqueoxygenarea.(callagainthattheversanitricinfrontturnsthearea)ThedirtymireinallrefluxesenterstheanaerobicDistrictwith10-30%dirtywater,canundertheanoxiawith10-30%carbonsourcetermcompleteremainingofdirtymireinrefluxinsidenitricacidnitrogentoversanitrictoturn,createsfortheuniqueoxygenpondofhereafteruniqueoxygenterm.Atthesametime,anaerobicDistrictinsideofconcurrentlythesexgermsconvertthedissolubilityBODVFA,thegermacquiretheVFAitsassimilationPHB,theenergysourceneededsolvesinthephosphoricwaterandcausephosphaticreleasing.TheanaerobicDistrictawaterenterstheinnerpartinstallstheuniqueoxygenareathathavethemixer,theso-calleduniqueoxygenisapondinsidetomixwithliquidsincehavenothenumeratoroxygen,alsohavenothecompoundoxygen(nitricacidroot),thehereuniqueoxygenenvironmentisnext,70-90%dirtywatercanprovidetheenoughcarbonsource,canmakethegermofreleasedthephosphoruswell.TheuniqueoxygenareaconnectsbehindthecommonCarrouseloxidizestheditchsystem,furthercompletingtodoawaywiththeBODandtakeoffthenitrogenwithdividedbythephosphorus.3Keywords:Arbansewage;Carrousel2000typeoxidationditch;Sludgeconcentrationdehydration4目录摘要...........................................1Abstract.........................................2目录...........................................4前言...........................................6第一章城市污水处理厂设计概况....................81.1设计概况.....................................81.2设计原则、范围与依据.........................91.3工程规模以及处理水质要求.....................91.4工艺流程的比较与选择........................101.5本设计工艺流程的确定........................151.6水处理构筑物设计说明........................151.7污泥处理构筑物设计说明......................211.8平面与高程布置..............................23第二章城市污水处理厂设计计算书.................272.1泵前中格栅..................................272.2污水提升泵房................................292.3泵后细格栅..................................312.4平流式沉砂池...
