11:375:101 Lecture 12: Chapter 20-Water Pollution
5 Dec 2017
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Document Summary
Film of organics on surface of water due to pollution. Sparked the song burn on by randy newman. Clean air act of 1970 and clean water act of 1972 to get control of pollution. Cuyahoga river today is clean and pollution-free. Cannot discharge without permit (governments and industry) Required secondary (higher) level of sewage treatment. Great success in usa, reducing major pollutants and waterborne infectious disease hazards. More nutrients on farmland that is leading to excess of nutrients in water. First concerns of the 1972 clean water act (cwa) Amount of dissolved oxygen required (demanded) by microbes to oxidize the organic matter in a sample. Measure the amount of organic carbon being consumed. Look at oxygen as organic matter is being consumed. Indirect measure of the concentration of biodegradable organics in the sample. Aerate the sample so there is plenty of dissolved oxygen (do) Seed with microbes if there are not enough organisms that will consume the oxygen.
