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1、本科毕业设计医院废水处理工艺设计摘要:本设计为某医院废水处理设计。该医院废水处理厂的处理水量为Q=5000t/d,不考虑远期发展。原污水中各项指标为:大肠杆菌:1200个/L,COD浓度:550mg/L。废水的BOD5浓度:160mg/L。废水的SS含量:250mg/L。氨氮NH3-H含量:45mg/L。污水经过处理后最终排放标准执行国家现行《污水综合排放标准》GB8978-96中一级排放标准,如下:CODcr≤60mg/L;BOD≤20mg/L;SS≤20mg/L;大肠杆菌≤500个/L;NH3-N≤15mg/L。目前,医院污水处理方法很多,有一级处理工艺、传统的二级处理工艺、改进替
2、代的二级生物处理工艺及医院污水的深度处理(三级处理工艺)。这些工艺中生化—消毒联用处理技术,特别是一些先进的或替代的二级生物处理工艺倍受青睐,例如,CASS工艺、UASB法、沼气处理工艺。与常规活性污泥法相比,医院污水经CASS工艺处理后,其COD、BOD5、SS、大肠菌群等水质指标均可达到《综合污水排放标准》(GB897—1996),且投资费用低、占地面积小、运行费用少。所以,选择CASS工艺配合二氧化氯消毒工艺来处理医院污水。关键词:医院废水,CASS工艺,二氧化氯消毒工艺本科毕业设计HospitalwastewatertreatmentprocessdesignAbstract:
3、Thedesignforahospitalwastewatertreatmentdesign.Designandpreliminarydesign.ThehospitalwastewatertreatmentplanttodealwithwaterasQ=5000t/d,donotconsiderthelong-termdevelopment.Rawsewageindicators:Escherichiacoli:1200/L,CODconcentration:550mg/L.WastewaterfromBOD5concentration:160mg/L.WastewaterfromS
4、Scontent:250mg/L.AmmonianitrogencontentofNH3-H:45mg/L.Sewageaftertreatmentforultimatedischargestandardsofcurrentnational"integratedwastewaterdischargestandard"GB8978-96inastandard,asfollows:CODcr≤60mg/L;BOD≤20mg/L;SS≤20mg/L;Escherichiacoli≤500/L;NH3-N≤15mg/L。.Atpresent,thehospitalwastewatertreat
5、mentmethods,includingthelevelofprocessingtechnology,thetraditionaltwostageprocessImprovedoralternative,twostagebiologicaltreatmentprocessandhospitalsewagedepthtreatment(threegradetreatmentprocess)butThevastmajorityofbiochemicalanddisinfectiontreatmentwiththecombinationoftechnology,especiallysome
6、advancedorreplacementoftwostagebiologicaltreatmentpopularCASSprocess,UASBprocessmethod,gastreatmenttechnologyandconventionalactivatedsludgemethod.HospitalWastewaterbyCASSprocess,COD,BOD5,SS,coliformandotherwaterqualityindicatorsCanachieveacomprehensivesewagedischargestandard"(GB897-1996),andlowi
7、nvestmentcost,smalloccupiedarea,Operatingcost.Therefore,selecttheCASStechnologywithchlorinedioxidedisinfectionprocessinhospitalwastewatertreatment.Keywords:hospitalwastewater,CASStechnology,chlorinedioxidedisinfectionprocess