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单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,water,environment,1,waterenvironment1,Water is the source of all things,Its the only water,but its the liquid wonder that makes our world possible.,Water is able to dissolve more substances than any other liquid.,Its takes a lot of water to keep life going.,2,Water is the source of all thi,1,2,3,Some data,water,use&pollution,what can we do,3,123Some data water use&pollut,71%,of earths surface is covered with water,Are the water sources,abundant?,4,71%of earths surface,less than 3%,Of total water,Low layer,0.3%of,fresh water,5,less than 3%Low layer0.3%,China water resource rank fourth in the world.,China isnt rich in water resources.,Obviously,the prospect of Chinese water resources isnt optimistic.,Water Issues in China,with water resources per capita being2200m3 or so,only 1/4 of that of the world.,water resources per capita,6,China water resource rank four,South:population 53%waterresource:78%,North:,population:47%water resource:22%,Uneven distribution,of water resources,7,South:population 53%wate,Water is considered polluted if a substance or condition is present that renders the water useless for a particular purpose,The sources of water,pollution,Direct sources,effluent outfalls from factories,refineries(,精炼厂）,waste treatment plants.,.,Indirect sources,contaminants that enter the water supply from soils/groundwater systems and from the atmosphere via rain water.,.,8,11/19/2024,Water is considered polluted i,Agricultural Water Use,Four common irrigation methods:,Surface/Flood,Requires extensive canal systems,Spray,Use pumps,Trickle,Strategically places openings,Sub-irrigation,Pipes can be used for drainage as well,9,11/19/2024,Agricultural Water UseFour com,Excessive fertilizer use may lead to eutrophication,（,水体富营养化,）,in many aquatic habitats.,Agricultural runoff from large,open expanses is major source of water pollution.,Agricultural Water Pollution,10,11/19/2024,Excessive fertilizer use may l,Industrial Water Use,Accounts for nearly 50%of all water withdrawal in U.S.,and 23%worldwide.,90%of water used by industry is for cooling,and is returned to the source.,Very little actually consumed.,Most processes involve heat exchange.,Water used to dissipate and transport waste.,Toxic and overload wastes lead Stream and lake degradation.,11,11/19/2024,Industrial Water UseAccounts f,Industrial Water Pollution,All kinds of industry generate trade waste,(,工业废水）,Iron and steel industry,Food industry,Complex organic chemicals industry,Nuclear industry,Pollutants:organics,oil,metal,acid,May require special wastewater,treatment.,12,11/19/2024,Industrial Water Pollution 1,Domestic Water Use,70%used as solvent to carry wastes.,30%used for lawn and garden.,Very small fraction used for drinking.,Natural purification processes,cannot cope with highly,concentrated urban wastes.,Must be treated before release.,13,11/19/2024,Domestic Water Use70%used as,Domestic water pollution,Waste water from Bathing,dishes,toilets,No toxic substance,abundant in nutrients with nitrogen(N,，氮）,and phosphorus(P,，磷）,Eutrophication,（水体富营养化）,Trash or garbage(e.g.paper,plastic,or food waste)discarded by people on the ground,along with accidental or intentional dumping of rubbish,that are washed by rainfall into storm drains and eventually discharged into surface waters.,14,11/19/2024,Domestic water pollution1410/7,For governments,1.To establish,urban sewage treatment system,(,城市污水处理系统,),2.To,r,estructure Industrial,3.To encourage the development of new water sources,4.To strengthen legislation,severe punishment,15,2024/11/19,For governments1.To establish,For plants,1.To reduce water consumption,2.To buy equipment of sewage treatment,3.Dont discharge sewage into water,4.To use water recycling system,16,2024/11/19,For plants1.To reduce water co,For individuals,1.Dont use cleaner conclude P,2.Dont throw the garbage into the rivers,3.To promote awareness of preserving water resources,4.To tell the persons around you to protect the water resources,17,2024/11/19,For individuals1.Dont use cl,World Water Day,(World Day for Water),On,March 22,the United Nations General Assembly,（联合国大会）,in 1993,aim:to arouse publics awareness of economizing water sources,and to protect it,one theme per year,2011:water for cities,18,World Water Day,Thank
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