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A wastewater treatment plant with a zero dissolved oxygen, discharges 10,000 m3/d to a small stream....

A wastewater treatment plant with a zero dissolved oxygen, discharges 10,000 m3/d to a small stream. The stream average flow is 0.4 m3/s with a dissolved oxygen level of 8 mg/l and a BOD5 of 2 mg/l. The minimum oxygen demand that must be maintained in the stream is 4 mg/l. Determine the maximum BOD5 that can be discharged if the initial ultimate BOD after the mixing is 8.1 mg/l. The BOD reaction rate is 0.23 d-1.

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