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?

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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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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