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GATE CE 2015 Set 1 — Question 60

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NAT+2 / -0MediumSedimentationDrinking Water TreatmentEnvironmental EngineeringPrimary SedimentationWastewater Treatment Processes

Environmental Engineering → Drinking Water Treatment → Primary Sedimentation

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Question

Consider a primary sedimentation tank (PST) in a water treatment plant with Surface Overflow Rate (SOR) of 40 m3/m2/d40\ m^3/m^2/d. The diameter of the spherical particle which will have 90 percent theoretical removal efficiency in this tank is __________ μm\mu m. Assume that settling velocity of the particles in water is described by Stokes's Law.
Given: Density of water =1000 kg/m3= 1000\ kg/m^3; Density of particle =2650 kg/m3= 2650\ kg/m^3; g=9.81 m/s2g = 9.81\ m/s^2; Kinematic viscosity of water (ν)=1.10×10−6 m2/s(\nu) = 1.10 \times 10^{-6}\ m^2/s
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