Question: A facultative oxidation pond is to be designed for a community of 5000 people. Summer wastewater flow is 2000 m3 /d, and the BOD5is 180

A facultative oxidation pond is to be designed for a community of 5000 people. Summer wastewater flow is 2000 m3

/d, and the BOD5is 180 g/m3. Winter flow and BOD5values are 6000 m3/d and 90 g/m3, respectively. Average pond temperatures are

3 20 C in the summer and 10 C in the winter. Assumin g that a CFSTR model is appropriate and that oxygen transfer will not be a problem, determine the pond volume required to reduce the influent BOD 5 to 20 mg/L.

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