Determine the NRC BOD removal efficiency for a two stage trickling-filter plant based on the following: primary clarification with 35% BOD reduction, first-stage filters loaded at 80 lb/1000frVday, intermediate settling, second stage filters sized identical to the first stage units, an operating recirculation ratio of 1.0 for all fillers, final clarification of the effluent, and a wastewater temperature of 18°C.
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