The folowing treated effluent in a dairy factory at Mosul city is discharge to a stream; Q= 30 L’s, DO-2 mg/L, 5-day BOD-40 mg/L, ka= 0.1/day, and T-20°C. Upstream from the outfall the watercourse has the following characteristics: Q= 0.27 m/s, DO-8 mg/L, 5-day BOD=2 mg/L, and T=20°C. The stream has a k= 0.2/day. Calculate the critical dissolved oxygen concentration downstream, and the distance from the outfall to this point assuming a mean velocity of 0.6 m/s in the river. The saturation value of DO at the temperature of the stream is 9.17 mg/L
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