MBIO 2815 Study Guide - Midterm Guide: Biochemical Oxygen Demand, Roquefort, Activated Sludge
7 May 2017
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Document Summary
Microorganisms are used most prominently in the secondary sewage treatment stage. This process is predominantly biological, designed to remove most of the organic matter and reduce bod. The purpose of sewage treatment is to remove the undesirable materials and harmful microorganisms. Water enters the facility, it contains large floating objects, gritty material, human excretion and oil and grease. When water leaves the facility, it has been skimmed, and screened out, and disinfected. Once water leaves the facility treated, the water is virtually clean enough for us to drink. Bod is a measure of the biologically degradable organic matter in water. The activity of aerobic microorganisms that grow under these conditions, oxidize much of the sewage organic matter into carbon dioxide and water. The sewage then moves into a settling tank where the clumps of organic matter settle out and more organic matter is removed.
