In a sedimentation tank, the detention period for water ranges from _____________ hours?
Correct answer: B. 2 to 4
- A. 8 to 12
- B. 2 to 4
- C. 16 to 20
- D. 24 to 32
Explanation
Water is normally retained in a sedimentation tank for roughly 2 to 4 hours, allowing suspended particles to settle under gravity. Shorter detention gives poor settling, while very long detention is generally uneconomical.
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