Calculate the required surface area and the minimum required recirculation ratio based on the following: cross-flow media with k20= 0.0018 (gpm/ft2)0'5, As = 42 ft2/ft3, n = 0.5, and D = 20 ft; settled wastewater flow Qp= 0.50 mgd; minimum wetting rate = 0.7 gpm/ft2; influent BOD = 162 mg/l, Sp = 80 mg/l, and temperature = 15°C; and effluent BOD = 20 mg/l and Se = 10 mg/l. For the calculated surface area, what is the BOD loading in pounds per 1000 ft3 per day?
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