Environmental Science 1021F/G Lecture Notes - Lecture 14: Nonpoint Source Pollution, Biochemical Oxygen Demand, Water Pollution
20 Mar 2016
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Document Summary
Water pollution any chemical, biological and/or physical change in water quality that is harmful to any living organism. Or it has changed the water to a state in which it cannot be used anymore. 3. 4 million deaths/yr: water quality ways to measure it. Bacterial counts: direct measure of fecal coliform (ex. e-coli, dissolved oxygen (do) bacteria use oxygen. So the more bacteria you have the less oxygen in the system: biological oxygen demand measurement within 1 liter of water. How much oxygen it produces over a period of time. If pollution levels are too high organisms will go. June bug, may bug, fish fly, leeches(exist in poor quality) Point source: easier to identify (factory pipe outlet) Major sources of water pollution: agriculture, sediment, fertilizers, pesticides, wastes, salt. Polluting our waters: stream/ river pollution, moderate pollution rapidly recoverable; high flow (flushes out some pollutants) Flow increases oxygen consumption degrades some pollutants.
