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AP Enviro -- Chapter 15

Terms in this set (44)

- Biological: pathogens, oxygen-demanding waste
- Chemical: nutrients (fertilizers), toxic inorganic materials, persistent organic pollutants (POPs)
- Physical: sediments, thermal pollution, solid waste
- Toxic chemicals: polluted w/ toxic organic substances of our own making, including pesticides, petroleum products, and other synthetic chemicals; Issuing&enforcing regulations of industry can help reduce release of many toxic chemicals
- Sediment: sediment that rivers transport can also impair aquatic ecosystems; Clear-cutting, mining, clearing land for housing development,&cultivating farm fields all expose soil to wind&water erosion; When a clear-water river receives a heavy influx of eroded sediment, aquatic habitat changes dramatically,&fish adapted to clear water may be killed; we can reduce sediment pollution by better managing farms&forests&avoiding large-scale disturbances of vegetation
- Thermal Pollution: water's ability to hold dissolved oxygen decreases as temperature rises, so some aquatic organisms may not survive when human activities raise water temperatures; when we withdraw water from a river&use it to cool an industrial facility, we transfer heath from the facility back into the river where the water is returned — people also raise water temperatures by removing stream side vegetation that shades water
- Nutrient Pollution: Eutrophication; we can reduce nutrient pollution by treating wastewater, reducing fertilizer application, using phosphate-free detergents,&planting vegetation&protecting natural areas to increase nutrient uptake
- Pathogens and waterborne diseases: Disease-causing organisms can enter drinking water supplies when these are contaminated w/ human waste from inadequately treated sewage or w/ animal waste from feedlots; We reduce the risks posed by waterborne pathogens by using chemical or other means of disinfect drinking water&by treating wastewater — other measures to lessen health risks include public education to encourage personal hygiene&government enforcement of regulations to ensure the cleanliness of food production, processing,&distribution