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| Q. |
In trickling filter, B.O.D. is reduced to |
| A. | 30 to 40% (B) (C) (D) |
| B. | 40 to 60% |
| C. | 60 to 80% |
| D. | 80 to 90% |
| Answer» C. 60 to 80% | |
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