Chapter 21 - Chapter21:WaterPollution 13:30

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Chapter 21: Water Pollution 13:30 Water pollution : any chemical, biological, or physical change in water quality  that has a harmful effect on living organisms or makes water unsuitable for  desired uses Point source : specific location (drain pipes, ditches, sewer lines) Nonpoint source : cannot be traced to a single site of discharge (atmospheric  disposition runoff) Major Water Pollutants Infectious agents (bacteria, viruses, parasites) Oxygen-demanding wastes (animal wastes) Cultural Eutrophication (nitrates, phosphates) Chemicals (fuels, plastics, pesticides, solvents, acids, salts, metals) Sediments (soil, silt) Thermal (heat) Table 21-2   common diseases transmitted to humans through contaminated  drinking water Detection Water sampling for nutrients Indicator species Testing soils beneath the water Genetic engineering: glowing microbes Infectious Agents: Fecal Coliform A fecal colifrom bacteria test is used to indicate the likely presence of disease- causing bacteria in water Figure 21-2 Pollution
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Degradable : can be broken down in the environment-chemically or  biologically (nutrients, sewage) Slowly degradable : such as DDT, are there for decades Nondegradable : are there permanently (toxic lead, arsenic, fluoride) Oxygen Demanding Wastes Only a few fish species can survive in water less than 4ppm at 20 degrees  Celsius Figure 21-3
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Chapter 21 - Chapter21:WaterPollution 13:30

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