The Lo value just downstream from a sewage outfall is 60 mg/L. The DO saturation level at that point is 9 mg/L. Given a deoxygenation rate coefficient of 0.28 / day and a rearation rate coefficient of 0.8/day. Determine a. The critical distance downstream assuming the sewage outfall is the only source of BOD for the river and that it flows at 50 miles / day. b. the minimum DO c. thet fraction of the BOD that would have to be removed by a waste water treatment plant to ensure > 5 mg/L everywhere downriver.
The Lo value just downstream from a sewage outfall is 60 mg/L. The DO saturation level at that point is 9 mg/L. Given a deoxygenation rate coefficient of 0.28 / day and a rearation rate coefficient of 0.8/day. Determine a. The critical distance downstream assuming the sewage outfall is the only source of BOD for the river and that it flows at 50 miles / day. b. the minimum DO c. thet fraction of the BOD that would have to be removed by a waste water treatment plant to ensure > 5 mg/L everywhere downriver.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The Lo value just downstream from a sewage outfall is 60 mg/L. The DO saturation level
at that point is 9 mg/L. Given a deoxygenation rate coefficient of 0.28 / day and a rearation
rate coefficient of 0.8/day. Determine
a. The critical distance downstream assuming the sewage outfall is the only source of
BOD for the river and that it flows at 50 miles / day.
b. the minimum DO
c. thet fraction of the BOD that would have to be removed by a waste water treatment
plant to ensure > 5 mg/L everywhere downriver.
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