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For a water treatment plant having a flow rate of 432m³/hr, what is the required plan area of a Type I setting tank to remove 90% of the particles having a settling velocity of 0.12 cm/sec is
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- 120 m²
- 111 m²
- 90 m²
- 100 m²
Correct Option: C
| η = | × 100 | |
| Vd |
| ∴ V0 = | × 100 | |
| η |
| = | = 1.34 r10-3 m/s | |
| 0.9 |
Q = AV0
| ⇒ A = Q = | (60 × 60 to convert hour to second) | |
| 60 × 60 × 1.34 × 10-3 |
= 90 m²
