英语城市污染.pptx

DirectoryThe pullution sourceThe treatment methodDefinitionSewage discharged into urban sewage systemIncludingmunicipalwastewaterdomesticsewageindustrialwastewaterThe 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.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.The treatment methodPrimary treatment：handle object：suspended solids treatment method：grille（格栅）grit chamber（沉砂池）settling basin （沉淀池）The treatment methodSecondary treatment：treatment method：activated sludge process SBR biological membrane oxidation ditchSBRThe water timeAeration timePrecipitation timeDrainage timeIdle timeThe treatment methodTertiary treatment：handle object：N、P、SS、organic matter treatment method：Biological methods Physical and chemical methodSewage treatment,of course,we also ought to begin from myselfThe sewage discharged into sewerSecondary water,control the amount of sewageGreen livingThanks