A single-stage, trickling-filter plant consists of a primary clarifier. a trickling filter 70 ft in diameter with a 7-ft depth of random packing, and a final clarifier. The raw-wastewater flow is 0.80 mgd with 200 mg/l of BOD and a temperature of 15°C. The constants for the random plastic media are an n of 0.44 and K2o of 0.090 min-1. Assuming 35% BOD removal in the primary, calculate the effluent BOD concentration (a) without recycle and with an indirect recirculation to the wet well of 0.40 mgd and direct recirculation of 0.80 mgd.
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