GATE CE 2019 Set 1 — Question 44
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Environmental Engineering → Drinking Water Treatment → Sedimentation
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Question
Sedimentation basin in a water treatment plant is designed for a flow rate of . The basin is rectangular with a length of , width of , and depth of . Assume that the settling velocity of these particles is governed by the Stokes' law. Given: density of the particles ; density of water ; dynamic viscosity of water ; gravitational acceleration . If the incoming water contains particles of diameter (spherical and uniform), the removal efficiency of these particles is
Correct answer
(B) 65%
Solution
1.Calculate Surface Overflow Rate (SOR):
2.Calculate Settling Velocity () using Stokes' Law:
Given: 3.Calculate Removal Efficiency ():
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