环境概论第9讲水污染PPT课件
52页1、环境概论Introduction to Environment,董方 土木与水利工程学院,第9讲 Water Pollution,Types of Water Pollution,Sewage,Types of Water Pollution,Effect of sewage on dissolved oxygen and biological oxygen demand,氧垂曲线,Types of Water Pollution,Clean Zone,Decomposition Zone,Septic Zone,Recovery Zone,Clean Zone,Normal clean water organisms (trout, perch, bass, mayfly, stonefly),Trash fish (carp, gar, leeches),Fish absent, fungi, sludge worms, bacteria (anaerobic),Trash fish (carp, gar, leeches),Normal clean water organisms
2、 (trout, perch, bass, mayfly, stonefly),8 ppm,Dissolved oxygen (ppm),Biological oxygen demand,8 ppm,Types of organisms,4,Types of Water Pollution,Eutrophication: An Enrichment Problem,Oligotrophic lake 贫营养湖泊,5,Types of Water Pollution,Eutrophication: An Enrichment Problem,Eutrophic lake 富营养湖泊,6,2010年6月22日,安徽巢湖东半湖双桥河一带拍摄的大面积蓝藻。,2010年6月22日,安徽巢湖东半湖双桥河一带拍摄的大面积蓝藻。,Discharge of untreated municipal sewage (nitrates and phosphates),Nitrogen compounds produced by cars and factories,Discharge of treated m
3、unicipal sewage (primary and secondary treatment: nitrates and phosphates),Discharge of detergents ( phosphates),Manure runoff from feedlots (nitrates, phosphates, ammonia),Dissolving of nitrogen oxides (from internal combustion engines and furnaces),Runoff and erosion (from cultivation, mining, construction, and poor land use),Runoff from streets, lawns, and construction lots (nitrates and phosphates),Lake ecosystem nutrient overload and breakdown of chemical cycling,Inorganic fertilizer runoff
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