ENVIRSC 1C03 Lecture Notes - Lecture 14: Biochemical Oxygen Demand, Eutrophication, Escherichia Coli
31 Mar 2017
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Document Summary
Specific spot where large quantities of pollutants are discharged. Consists of small point sources distributed over a wide area. Groundwater can be polluted by defective onsite septic systems, leaky tanks, or pipelines containing petroleum products/ leaks for spills. Pollution can occur from seepage from landfills, fertilizers, pesticides. These can be broken down by chemical reactions or by bacteria into simple substances. Can lead to eutrophication if their pollution load is too high. Degrade slowly or cant be broken down at all. Measure of oxygen consumed by microbes as they break down organic matter within water. Dead organic matter is added to streams and rivers from a natural source (ex. Problems with assimilative capacity occur when there is overload with biochemically oxygen demanding waste. Exceeds streams capacity and overpowers the stream"s natural cleansing function. High bod do becomes to low (when do is less than 5 mg/l)
