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Environmental Sciences: Towards a Sustainable Future Chapter 18

Water Pollutants and Trying to Copy Nature's Water Filters. Major sources of water pollutionEutrophication: causes and curesHuman sewage management: a pollutant of amount" and type".. Pollution. Pollution: the presence of a substance in the environment that because of its chemical compositio

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Environmental Sciences: Towards a Sustainable Future Chapter 18

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    1. Environmental Sciences: Towards a Sustainable Future Chapter 18 Water: Pollution and Prevention

    2. Water Pollutants and Trying to Copy Natures Water Filters Major sources of water pollution Eutrophication: causes and cures Human sewage management: a pollutant of amount and type.

    3. Pollution Pollution: the presence of a substance in the environment that because of its chemical composition or quantity prevents the functioning of natural processes and produces undesirable environmental and health effects.

    4. Pollution Categories Air Particulates Acid-forming compounds Photochemical smog CO2 CFCs

    5. Pollution Categories Water and land Nutrient oversupply Solid wastes Toxic chemicals Pesticides/herbicides Nuclear waste

    6. Point and Nonpoint Sources of Pollution

    7. Types of Water Pollutants Pathogens Organic Wastes Chemical Sediments Nutrients

    8. Pathogens Disease-causing agents (Table 18.1) Safety measures purification of public water supply sanitary collection/treatment of sewage sanitary practices when processing food

    9. Organic Wastes Dissolved oxygen (DO) in the water is depleted during decomposition of organic wastes. Water quality test. Biochemical oxygen demand (BOD): measure of the amount of organic material.

    10. Chemical Pollutants Inorganic chemicals Heavy metals, acids, road salts Organic chemicals Petroleum, pesticides, detergents

    11. Effect of Sediments on Stream Ecology Loss of hiding-resting places for small fish. Attached aquatic organisms scoured from the rocks and sand. Poor light penetration

    12. Aquatic Plant Life Benthic plants Emergent vegetation Submerged aquatic vegetation (SAVs) Phytoplankton Green filamentous and single cell Bluegreen single cell Diatoms single cell

    13. Nutrient Enrichment Oligotrophic: nutrient-poor water Eutrophic: nutrient-rich water

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