A biological tower has vertical-flow packing with a k20= 0.0014 (gpm/ft2)0,5, n = 0.50, and As 36 ft2/ft3. The tower is cylindrical, with a diameter of 32 ft and depth of packing of 16 ft. The primary effluent is 0.60 mgd with 80 mg/l of soluble BOD at a temperature of 14°C. Direct recirculation is 400 gpm and the final clarifier is properly sized. Calculate the soluble BOD loading, hydraulic loading, and soluble effluent BOD using Eq. (12.53).
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