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What can be done physical or chemical change in water

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Unformatted text preview: al or chemical change in water that adversely affects the health of humans or other organisms Global problem Eight different categories 5 6 1 3/29/2011 Types of Water Pollution Sources of Water Pollution Sediment pollution Sewage and waste water Fecal coliform and other disease-causing diseaseagents agents Eutrophication Organic compounds Inorganic chemicals Radioactive substances Thermal pollution Natural sources HumanHuman-generated Point source: specific source Nonpoint source Polluted runoff Enters over a large area 7 8 Walkerton Case Study Nonpoint Source Pollution •In May 2000 water supply of Walkerton (pop’n ~5000) became contaminated with a dangerous strain of E. coli coli bacteria (O157:H7), from farm runoff into an adjacent well •Symptoms: bloody diarrhea, gastrointestinal infections •2,500 became ill, 7 died Agriculture 72% of water pollution Fertilizers, pesticides, manure Soil erosion Urban runoff Variety of contaminants 9 •Walkerton water tragedy cost a minimum of $64.5-155 million •Key recommendations touched on: • sou...
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