A town having a population of 30000 persons is producing sewage at the rate of 120 lpcd with initial BOD of waste being 250 mg/l. If 30% of the B.O.D is removed in the primary clarifier itself, then determine the minimum required volume (in m3) of high rating trickling filter for achieving desired effluent BOD of 30 mg/l. (Assume recirculation ratio of 1.5).
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