ch20_0495556718_164058 - aboveground tanks. 4. Water...

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Chapter 20 Water Pollution Summary 1. Water pollutants include infectious agents from human or animal wastes; oxygen-demanding wastes from sewage, paper mills, and food processing; inorganic chemicals from surface runoff, industrial effluents, and household cleaners; organic chemicals from oil, plastics, pesticides, and detergents; sediment from erosion; and thermal pollution from power plant cooling. 2. Water pollution problems in streams and lakes relate to chemical and biological pollutants, with the greater problems being cultural eutrophication. 3. Groundwater pollution is caused by leaks from waste ponds and underground storage tanks, chemical dumping or spilling, surface runoff, and fertilizers. It can be prevented by finding substitutes for toxic chemicals, installing monitoring wells near landfills and underground tanks, requiring leak detectors on underground tanks, banning hazardous waste disposal in landfills and injection wells, and storing harmful liquids in
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Unformatted text preview: aboveground tanks. 4. Water pollution of oceans relates to nitrogen oxide from industry and cars, heavy metals from effluents, toxic sediment, sewage, runoff of pesticides, manure, fertilizers, and red tides from excess nitrogen. 5. Reduction or prevention of water pollution can be achieved through reduction of use of toxic pollutants, banning of ocean dumping of sludge, protection of sensitive areas from oil drilling and oil transport, regulation of coastal development, and regulation of sewage treatment. 6. The U.S. Safe Drinking Water Act of 1974 requires that drinking water contain less than the maximum contaminant levels for any pollutants that may have adverse effects on human health. Restructuring of water treatment systems, enforcing current regulations, banning the use of lead in new structures, and chemical tests and biological indicators can be used to make drinking water safer....
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