geology_29

geology_29 - Chapter 12: Water Pollution Common pollutants:...

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Chapter 12: Water Pollution Common pollutants: Pollutant : Any substance that, in excess, is known to be harmful to desirable living organisms Oxygen-demanding waste (common organic waste) Pathogenic waste (pathogenic microbes) Nutrients Petroleum (oil) Toxic waste (chemicals, heavy metals, radioactive waste) Sediment Thermal plumes Oxygen-demanding waste: Dead organic matter decomposed and consumed by aerobic bacteria, which need oxygen to live BOD ( Biochemical Oxygen Demand ) is the amount of oxygen used for bacterial decomposition High BOD, associated with a high level of decaying organic matter in water, reduces O for other healthy organisms Sources of oxygen-demanding waste : Natural processes, agricultural applications (33%), urban sewage, and runoff Pathogenic microbes: Fecal coliform bacteria Harmful risks (diseases and death ) of E. coli which leads to disease and death in humans Billions exposed to waterborne diseases, especially in poor countries
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geology_29 - Chapter 12: Water Pollution Common pollutants:...

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