A facultative pond is designed for a community of 5000 people. Summer wastewater flow is 2000 m3/d and BOD5 is 180 mg/l. Winter flow and BOD5 values are 6000 m3/d and 90 g/m3 respectively. Average pond temperatures are 20 oC in the summer and 10 oC in the winter. Assuming that a CFSTR model is appropriate and that oxygen transfer will not be a problem, determine the pond volume required to reduce the influent BOD5 to 20 mg/l.
Calculation of Volume of Oxidation Pond
It is assumed that CFSTR model is appropriate, so
BODin = BODout + BODconsumed
Q0S0 = Q0S +V(kS)
Q0 = wastewater inflow (m3/d)
S0 = influent BOD (g/ m3)
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Oct 14, 2020EXPERT
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