A sewage treatment plant discharges 4 ML/d of effluent with 28 mg/L of BOD5 into a stream. The stream discharge is 16 ML/d, and its initial BOD5 is 6 mg/L. The initial DO in the effluent is 2 mg/L, and in the stream it is 7 mg/L. Compute the minimum DO level in the stream, assuming that k1 = 0.1/d and k2 = 0.3/d. Assume that the saturation DO level is 10.0 mg/L. If the velocity of streamflow is 0.1 m/s, how far downstream does the minimum DO occur?
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