An industrial treatment plant has a strong wastewater with 450 mg/l BOD (the soluble portion is 250 mg/l) and 280 mg/l suspended solids. The biological tower treatment process (Figure I 1-23) consists of high- density, cross-flow packing media with dimensions of 180 sq ft by 20 ft high. The packing has a specific area of 42ft27ft3, n = 0.5, and k20 = 0.0035(gpm/ft2)0.5. The primary clarifier effluent is 0.8 mgd at 18°C. The recirculation ratio is 1.0. Calculate the effluent soluble BOD at 20°C, then correct the calculation for actual temperature. Calculate the soluble and total effluent BOD assuming that the effluent has 0.54 soluble BOD/total BOD
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