Size an extended aeration system for the town of Nancy (Problem). Provide two identical activated-sludge aeration tanks with diffused aeration and final clarifiers. The treated wastewater is required to meet the effluent standards of 30 mg/l of BOD and 30 mg/l of suspended solids at a wastewater temperature of 15°C. The sludge is to be stabilized by aerobic digestion and dewatered on drying beds.
Problem:
The following are design data for the town of Nancy, with a sewered population of 7600. Design flows are as follows: the average daily flow is 0.84 mgd. the peak hourly flow is 1.25 mgd, and the minimum hourly flow is 0.12 mgd. Design average BOD equals 1740 lb/day and average suspended solids equal 1530 lb/day. Calculate the following: equivalent population based on 0.20 lb of BOD per capita; design flows in units of gpm, ft3/sec, nrVmin, and nrVd; mean BOD and SS concentrations in mg/l.
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