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2. A municipal wastewater (Q = 6,000 m/d) having a BOD; of 250 g/m³. The water is treated by primary sedimentation before treated by a trickling filter. The primary sedimentation removes BOD5. The desired trickling filter effluent quality is 25 g/m³ of BOD5. If the filter depth is 2 m and the recirculation ratio is 1.
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