A sewage treatment plant discharges 2 mgd of effluent with 30 mg/L of BOD5 into a stream. The stream discharge is 10 mgd, and its initial BOD5 is 5 mg/L. The initial DO in the effluent is 3 mg/L, and in the stream it is 9 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 12.0 mg/L. If the velocity of streamflow is 20 ft/min, how far downstream does the minimum DO occur?
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