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| Q. |
What is the detention period of a clarifier used in the treatment of water? |
| A. | 1hour |
| B. | 2hours |
| C. | 3hours |
| D. | 4hours |
| Answer» C. 3hours | |
| Explanation: the detention period of a clarifier is lower than in the plain sedimentation tank and its range is 2.5 to 3 hours. | |
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