The DO of a river is 5.9 mg/L just downstream from a wastewater outfall. The mix of river and wastewater has a BOD of 25 mg/L. The DOs is 9.2 mg/L and the kd = 0.22 / day. a. estimate the rearation coefficient assuming a river speed of 0.20 m/s and an average depth of 3.5 m b. find the critical distance downstream where DO is a minimum c. what percent of BOD has to be removed from wastewater to maintain > 5mg / L DO if it is the only source of river BOD
The DO of a river is 5.9 mg/L just downstream from a wastewater outfall. The mix of river and wastewater has a BOD of 25 mg/L. The DOs is 9.2 mg/L and the kd = 0.22 / day. a. estimate the rearation coefficient assuming a river speed of 0.20 m/s and an average depth of 3.5 m b. find the critical distance downstream where DO is a minimum c. what percent of BOD has to be removed from wastewater to maintain > 5mg / L DO if it is the only source of river BOD
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The DO of a river is 5.9 mg/L just downstream from a wastewater outfall. The mix of
river and wastewater has a BOD of 25 mg/L. The DOs is 9.2 mg/L and the kd = 0.22 / day.
a. estimate the rearation coefficient assuming a river speed of 0.20 m/s and an
average depth of 3.5 m
b. find the critical distance downstream where DO is a minimum
c. what percent of BOD has to be removed from wastewater to maintain > 5mg / L DO
if it is the only source of river BOD
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