Consider the feasibility of treating the wastewater from the town of Nancy (Problem in a two-stage stone-media trickling-filter plant with intermediate clarification. The treated wastewater is required to meet the effluent standards of 30 mg/l of BOD and 30 mg/l of suspended solids at a wastewater temperature of 15°C. Assume a primary BOD removal efficiency of 35%. Calculate the volume of filter media required at a BOD loading of 35 lb/1000 ft3/day and divide the resulting volume equally between the first-stage and second-stage filters. Use a filter media depth of 7.0 ft. Assuming a recirculation ratio of 0.5 for both filters, determine the effluent BOD concentration using the NRC' formulas.
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