ENVIRONMENTAL ENGINEERING-WATER POLLUTION: The ultimate BOD of a river just below a sewage outfall is 50.0 mg/L, and the DO is at the saturation values of 10.0 mg/L. The deoxygenation rate coefficient, kd is 0.30/day, and the reaeration coefficient, kr is 0.90/day. The river is flowing at a speed of 48 miles per day. The only source of BOD on this river is this single outfall. FIND: The critical distance downstream at which DO is a minimum. The minimum DO. If a wastewater treatment plant is to be built, what fraction of BOD would have to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream?
ENVIRONMENTAL ENGINEERING-WATER POLLUTION: The ultimate BOD of a river just below a sewage outfall is 50.0 mg/L, and the DO is at the saturation values of 10.0 mg/L. The deoxygenation rate coefficient, kd is 0.30/day, and the reaeration coefficient, kr is 0.90/day. The river is flowing at a speed of 48 miles per day. The only source of BOD on this river is this single outfall. FIND: The critical distance downstream at which DO is a minimum. The minimum DO. If a wastewater treatment plant is to be built, what fraction of BOD would have to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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ENVIRONMENTAL ENGINEERING-WATER POLLUTION:
The ultimate BOD of a river just below a sewage outfall is 50.0 mg/L, and the DO is at the saturation values of 10.0 mg/L. The deoxygenation rate coefficient, kd is 0.30/day, and the reaeration coefficient, kr is 0.90/day. The river is flowing at a speed of 48 miles per day. The only source of BOD on this river is this single outfall.
FIND:
- The critical distance downstream at which DO is a minimum.
- The minimum DO.
- If a wastewater treatment plant is to be built, what fraction of BOD would have to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream?
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