Multiple choice

A plain sedimentation tank with a length of 20 m, width of 10 m and a depth of 3 m is used in a water treatment plant to treat 4 million litres of water per day (4 MLD). The average temperature of water is 20°C. The dynamic viscosity of water is 1.002 x 10–3 N.s/m2 at 20° C. Density of water is 998.2 kg/M3. Average specific gravity of particles is 2.65.

What is the minimum diameter of the particle which can be removed with 100% efficiency in the above sedimentation tank?

  1. 11.8 x 10–3 mm

  2. 16.0 x 10–3 mm

  3. 50 x 10–3 mm

  4. 58 x 10–3 mm
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