资源描述：
《CAST工艺的设计计算(修改)》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、bd摘要水是人类的生命之源，也是社会经济发展最重要的支持要素。近年来，随着我国社会经济高速发展和城市化快速推进，饮用水安全和水环境质量要求不断提高，与此同时，生活污水和生产废水排放量明显增加，各种污染物排放量不断增长，使我国水资源和水环境面临严重挑战。因此提高污水处理率，保护有限的水资源已经成为我国环境保护工作的紧迫任务。本设计的主要任务是某城市污水处理厂的设计，设计规模为50000m3/d。根据进、出水水质指标要求，综合各方面因素考虑，最终选取了CAST工艺。污水处理流程为：原污水→中格栅→污水泵房→
2、细格栅→沉砂池→CAST池→接触消毒池→出水；污泥处理流程为：从CAST池排出的剩余污泥→污泥浓缩池→污泥脱水机房→泥饼外运。根据处理流程，对各构筑物进行选型、设计并确定附属设备的型号。完成了该城市污水处理厂的平面布置图和高程布置图，以及主要构筑物的设计图。最后对本工程的投资和运行成本进行了简单的概预算。最终完成该城市污水处理工程的设计。关键词：城市污水，CAST工艺，设计bdbdABSTRACTWaterisnotonlythesourceofhumanlife,butalsothemostimpor
3、tantsupportingfactorofthesocialandeconomicdevelopment.Inrecentyears,asChina'srapideconomicdevelopmentandsocialrapidurbanization,drinkingwatersafetyandwaterqualityrequirementscontinuetoincrease,atthesametime,domesticsewageandwastewateremissionsincreasedsi
4、gnificantly,risingemissionsofvariouspollutants,waterresourcesandwaterenvironmentisfacingseriouschallenges.Therefore,acceleratingthesewagetreatmentratetoprotectthelimitedwaterresourceshasbecomeanurgenttaskforChineseenvironmentalprotectionwork.Themaintasko
5、fthisdesignisthesewagetreatmentplantinanurbansewagetreatment,designsize50000m3/d.TheCASTprocessisselectedandaneffectivefeasibleprocessofsewagetreatmentisdesignedforthewastewateraccordingtowaterqualityindexesofinflowanddrainage.Thesewagetreatmentplantproc
6、ess:fromthepumpingstationtothegritchamber,intotheCASTreactor,contactdisinfectiontank,thefinaleffluent;sludgeprocess:fromtheCASTreactorsludgedischargedfromintothesludgethickeningtankforpollutionsoilenrichment,andthensenttothebeltfilterpress,andfurtherdehy
7、drated,transportedforburning.Theprocesshastheadvantagesofhighresistancetoshockloading,smallarea,lowcost,flexibleoperationandotheradvantages.bdbdDeterminethevariousofselection,design,calculationofthestructuresizeandthetypeofauxiliaryequipmentaccordingtoth
8、eprocess,Onthisbasis,completethesewagetreatmentplantlayoutandverticallayout,anddrawtheplanelayoutandverticallayout,aswellasthemainstructuredesign.Finally,makeasimplebudgetoftheprojectinvestmentandoperatingcosts.Finalizethe
