A mixture of river water and effluent from a municipal wastewater treatment plant is completely mixed near the point of discharge. The dissolved oxygen concentration in the river at the mixing point is 5.6 mg/L, and the ultimate BOD of the mixed water is 24 mg/L. The temperature of the river is 21ºC. The deoxygenation constant for the river is kd = 0.06/day.
What will be an ideal response?
a. Estimate the re-aeration coefficient assuming the river speed is 0.25 m/s and the average depth is 3 m.
b. Find the critical time downstream at which the minimum DO occurs.
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