Question: A biological tower hos vertical-flow pocking with o ky, = 0.0014 (gom//fri)05, n = 0.50, and A, = 36 fri/it. The tower is cylindrical, with

A biological tower hos vertical-flow pocking with o ky, = 0.0014 (gom//fri)05, n = 0.50, and A, = 36 fri/it. 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 gom and the final clarifier is properly sized. Calculate (o) the soluble BOD loading (b/1000ft:/day], (b) the actual hydraulic loading that includes recycle [gom/ft=], and (c) soluble affluent BOD using the Modified Velz equation presented in closs. Answer to Problem 2 3. To calculate the BOD loading, we need to know the volume of the reactor. For the 32 fit diameter filter, R=16 ft, and the filter volume is that of a cylinder, or V=A L = mrL = * (16 ft) (16 ft) = (804 At

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