11-Microbiology_Water_Mar12

In missisquoi bay lake champlain public health

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Unformatted text preview: ng in the spring and fall only. 18 Brock Biology of Microorganisms, 13th Edi<on. Rivers •  Rivers: good mixing/aera<on ensures that organic maPer, within limits, is degraded effec<vely (no fermenta<on, no H2S produc<on). •  Excess organic maPer may s<ll result in anaerobiosis with consequences similar to those seen in eutrophic lakes. 19 Pollu<on •  Pollu<on of freshwater: deliberate discharge of effluents into a waterway – major source is sewage. •  Sewage is rich in organic maPer and contains a large number of organisms (some may be pathogens). •  Aerobic and faculta<ve organisms oxidize organic maPer using the dissolved oxygen. •  Biochemical oxygen demand (BOD) is high (used as a measure of the extent of pollu<on by organic maPer). Water tends to become...
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