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A single stage tricking filter is treating 5 MLD of sewage. The BOD load concentration on the filter is 150 mg/L and the filter is designed with a recirculation ratio of 1.2. The volume of the filter is 900 m3. Using the NRC equation, the efficiency of the trickling filter is –
1
86.54%
2
81.08%
3
76.7%
4
71.35%