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A town has an existing horizontal flow sedimentation tank with an overflow rate of 17m³ /day/m², and it is desirable to remove particles that have settling velocity of 0.1 mm/s. Assuming the tank is an ideal sedimentation tank, the percentage of particles removal is approximately equal to
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- 30%
- 50%
- 70%
- 90%
Correct Option: B
% particle removed = efficiency,
| η = | × 100 = | × 100 | ||||
| V0 |  |  | ||||
| 24 × 3600 | ||||||
= 50.8%
