医院废水处理工艺设计(上)医院废水处理工艺设计(上)医院废水处理工艺设计(上)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HospitalwastewatertreatmentprocessdesignAbstract：Thedesignforahospitalwastewatertreatmentdesign。Designandpreliminarydesign。ThehospitalwastewatertreatmentplanttodealwithwaterasQ=5000t/d,donotconsiderthelong-termdevelopment.Rawsewageindicators：Escherichiacoli:1200/L,CODconcentration:550mg/L。WastewaterfromBOD5concentration:160mg/L。WastewaterfromSScontent: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，thehospitalwastewatertreatmentmethods,includingthelevelofprocessingtechnology,thetraditionaltwostageprocessImprovedoralternative，twostagebiologicaltreatmentprocessandhospitalsewagedepthtreatment（threegradetreatmentprocess）butThevastmajorityofbiochemicalanddisinfectiontreatmentwiththecombinationoftechnology,especiallysomeadvancedorreplacementoftwostagebiologicaltreatmentpopularCASSprocess,UASBprocessmethod，gastreatmenttechnologyandconventionalactivatedsludgemethod。HospitalWastewaterbyCASSprocess，COD，BOD5，SS,coliformandotherwaterqualityindicatorsCanachieveacomprehensivesewagedischargestandard”（GB897—1996)，andlowinvestmentcost，smalloccupiedarea,Operatingcost。Therefore,selecttheCASStechnologywithchlorinedioxidedisinfectionprocessinhospitalwastewatertreatment.Keywords:hospitalwastewater，CA