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The following data are given for a channel-type grit chamber of length 7.5 m.
(i) flow through velocity = 0.3 m/s
(ii) the depth of wastewater at peak flow in the channel = 0.9 m
(iii) specific gravity of inorganic particles = 2.5
(iv) g = 9.80 m/s², m = 1.002 × 10–3 N/s/m² at 20°C, pw 1000 kg/m³ Assuming that the stokes is valid, the largest diameter particle that would be removed with 100 parent efficiency is
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- 0.01 mm
- 0.21 mm
- 1.92 mm
- 6.64 mm
Correct Option: B
| v = | = | ||
| l | 1000 |
= 1.002 × 10-6 m²/s
| Vs = | (s-1)d² | |
| 18v |
| 0.036 = | (2.5-1) × | ||
| 180 | 1.002 × 10-6 |
∴ d = 0.21 mm
