英语城市污染.pptx

DefinitionSewage discharged into urban sewage system第1页/共15页Includingmunicipalwastewaterdomesticsewageindustrialwastewater第2页/共15页第3页/共15页The pullution sourceMunicipalwastewater is collected through pipes all drainage,is discharged into water pipe system of sewage,industrial wastewater and the mixed water of urban rainfall runoff.第4页/共15页At present，in economic development,social progress and the importance of water in the peoples life are indispensable for break.However,with the accelerating industrialization and urbanization,is facing the challenge of shortage of water resource,serious pollution in our country.第5页/共15页第6页/共15页The treatment methodPrimary treatment：handle object：suspended solids treatment method：grille（格栅）grit chamber（沉砂池）settling basin （沉淀池）第7页/共15页第8页/共15页The treatment methodSecondary treatment：treatment method：activated sludge process SBR biological membrane oxidation ditch第9页/共15页SBRThe water timeAeration timePrecipitation timeDrainage timeIdle time第10页/共15页The treatment methodTertiary treatment：handle object：N、P、SS、organic matter treatment method：Biological methods Physical and chemical method第11页/共15页Sewage treatment,of course,we also ought to begin from myselfThe sewage discharged into sewerSecondary water,control the amount of sewage第12页/共15页Green living第13页/共15页Thanks第14页/共15页感谢您的观看！第15页/共15页