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26-05-2023
Engineering

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A wastewater treatment plant discharges 0.18 m3 /s of treated wastewater into a creek. The creek has a flow rate of 0.20 m3 /s. The BOD5 of the wastewater discharge is 38 mg/L. Upstream of the wastewater discharge from the creek, the BOD5 is 2 mg/L. The BOD rate constants k are 0.25 d-1 and 0.08 d-1 for the wastewater discharge and the creek water, respectively. The temperature of both the creek and the municipal wastewater discharge is 20˚C. Calculate the initial ultimate BOD right after the mixing of the wastewater discharge and creek.

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