GATE CE 2019 Set 1 — Question 44

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MCQ+2 / -0.67MediumSedimentationDrinking Water TreatmentEnvironmental Engineering

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 0.2 m3/s0.2\text{ m}^3/\text{s}. The basin is rectangular with a length of 32 m32\text{ m}, width of 8 m8\text{ m}, and depth of 4 m4\text{ m}. Assume that the settling velocity of these particles is governed by the Stokes' law. Given: density of the particles =2.5 g/cm3= 2.5\text{ g}/\text{cm}^3; density of water =1 g/cm3= 1\text{ g}/\text{cm}^3; dynamic viscosity of water =0.01 g/(cms)= 0.01\text{ g}/(\text{cm}\cdot\text{s}); gravitational acceleration =980 cm/s2= 980\text{ cm}/\text{s}^2. If the incoming water contains particles of diameter 25 μm25\text{ }\mu\text{m} (spherical and uniform), the removal efficiency of these particles is
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