The following are average operating data from a conventional activated-sludge secondary: wastewater flow = 7.7mgd, volume of aeration tanks = 300.000 ft3 = 2.24 mil gal. influent total solids =600mg/l, influent suspended solids - 120 mg/l, influent BOD = 173 mg/l. effluent total solids = 500 mg/l, effluent suspended sOlids = 22 mg/l. effluent BOD = 20 mg/l, mixed-liquor suspended solids = 2500 mg/l, re circulated sludge flow = 2.7 mgd, waste sludge quantity = 54,000 gpd, and suspended solids in waste sludge = 9800 mg/l. Based on these data, calculate the following: aeration period; BOD loading in lb/1000 ft'/day; F/M ratio in lb BOD/day/lb MTSS: total solids, suspended solids, and BOD removal efficiencies: sludge age; and return sludge rate.
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