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A town is required to treat 4.2 m³/min of raw water for daily domestic supply. Flocculating particles are to be produced by chemical coagulation. A column analysis indicated that an overflow rate of 0.2 mm/s will produce satisfactory particle removal in a settling basin at a depth of 3.5 m. The required surface area (in m²) for settling is
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- 210
- 350
- 1728
- 21000
Correct Option: B
Q = 4.2 m³/min = 0.07 m³/s
Vo = 0.2 mm/s = 0.2 × 10–3 m/s
| Vo = | ||
| A |
| ∴ A = | ||
| Vo |
| = | = 350 m² | |
| .2 × 10-3 |
