An-existing single-stage trickling-filter plant cannot meet the effluent limitation of 30 mg/l BOD during cold weather, in operation under the design loading with the wastewater temperature at 15°C, the plant influent BOD is 240 mg/l. the primary effluent BOD equals 155 mg/l, and the plant effluent averages 55 mg/l. The proposed modification is the addition of a second-stage trickling filter and final clarifier to reduce the effluent BOD from 55 to 30 mg/l with a wastewater temperature of 15°C. Under normal operation, the recirculation flow in the second-stage filtration is to be one-half of the average wastewater flow entering the plant. Calculate the design BOD loading that should be used to determine the volume of stone media needed in the proposed second-stage filler.
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