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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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1. Environmental Sciences: Towards a Sustainable Future Chapter 18 Water: Pollution and Prevention
2. Water Pollutants and Trying to Copy Nature’s 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
CFC’s
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 (SAV’s)
Phytoplankton
Green filamentous and single cell
Bluegreen single cell
Diatoms single cell
13. Nutrient Enrichment Oligotrophic: nutrient-poor water Eutrophic: nutrient-rich water