single stage trickling filter plant consist of a primary clarifier, trickling filter 78 ft in diameter wif a 81 ft depth of random packing and a secondary clarifier. Teh hydraulic loading of primary effluent wifout recirculation TEMPhas 0.606 gpm/ft flow. Teh primary effluent TEMPhas a soluble BOD of 238 mg/L. teh temperature of teh wastewater is 16 °C. Teh constants for teh random plastic media are n-0.45, k20-0.0038 (gpm/ft³) 05 and As 36 ft/ft³. Calculate teh soluble (filtered) BOD in teh effluent in mg/l assuming teh indirect recirculation ratio is 0.5