ENVIRSC 1C03 Lecture Notes - Lecture 21: Mirex, Species Richness, Biochemical Oxygen Demand
1 Mar 2017
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Document Summary
Chemicals (anthracene, benzoaphyrene) structures for primary decomposition- takes them a long time. Measure of the amount of oxygen consumed by microbes. Organic waste, dead leaves at the bottom of lakes/rivers- over time it will break down. 33% of all bod in streams from agriculture (dispose of manure) Broken down by microbes- some bodies of water are more resilient. Assimilative capacity- all steams have some capacity to degrade organic waste. If do content less than 5mg/l: most aquatic organisms are going to be suffocating when it falls below 5mg/l. Bod is low dissolved oxygen is high. Bod is high, dissolved oxygen is low. Surface water pollution you can see the problem; and a lot easier to monitor. Midnight dumping where companies just dump all barrels of waste in the fields at night; fairly common problem: waste/chemicals can spill, more problems with groundwater pollution. Residence time: 2 weeks to 10, 0000. Plume is going to be expanding away from the waste side.
