EESA11H3 Final: Final Prep
1 Aug 2018
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Document Summary
Lecture 6 & 7 water pollution & eutrophication. Eutrophication is the process by which a body of water becomes enriched in dissolved nutrients that stimulate the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen. Nutrient input can be increased by human activities (cultural eutrophication) or can occur naturally. Oligotrophic bodies of water that have clear water and low biological productivity. Symptoms of cultural eutrophication (caused by human activities) Early stage symptoms consist of increase in phytoplankton standing crop (biomass) and biomass at other trophic levels. Complete depletion of oxygen and high concentrations of nutrients (due to redox reactions) in hypolimnion. Invertebrates and fish communities change: species requiring high oxygen levels disappear, species tolerant of low oxygen levels dominate. Point source pollution: it refers to pollution that enters the water body from a specific location. E. g. wastewater treatment facility, sewage waste, industrial water discharge. Specialized treatment wastewater disinfection discharge of effluent.
