GATE CE 2020 Set 1 — Question 62

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NAT+2 / -0HardPrimary SedimentationWastewater Treatment ProcessesEnvironmental Engineering

Environmental Engineering → Wastewater Treatment Processes → Primary Sedimentation

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Question

Surface Overflow Rate (SOR) of a primary settling tank (discrete settling) is 20000 litre/m2 per day20000 \text{ litre/m}^2 \text{ per day}. Kinematic viscosity of water in the tank is 1.01×102 cm2/s1.01 \times 10^{-2} \text{ cm}^2/\text{s}. Specific gravity of the settling particles is 2.642.64. Acceleration due to gravity is 9.81 m/s29.81 \text{ m/s}^2. The minimum diameter (in μm\mu\text{m}, round off to one decimal place) of the particles that will be removed with 80%80\% efficiency in the tank, is ________.
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