GATE CE 2024 Set 2 — Question 42

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MCQ+2 / -0.67HardFiltrationDrinking Water TreatmentEnvironmental EngineeringTerminal VelocityForces on Immersed BodiesWater Resources Engineering

Environmental Engineering → Drinking Water Treatment → Filtration

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Question

A hypothetical multimedia filter, consisting of anthracite particles (specific gravity: 1.501.50), silica sand (specific gravity: 2.602.60), and ilmenite sand (specific gravity: 4.204.20), is to be designed for treating water/wastewater. After backwashing, the particles should settle forming three layers: coarse anthracite particles at the top of the bed, silica sand in the middle, and small ilmenite sand particles at the bottom of the bed.
Assume
(i) Slow discrete settling (Stoke’s law is applicable)
(ii) All particles are spherical
(iii) Diameter of silica sand particles is 0.20 mm0.20\text{ mm}The CORRECT option fulfilling the diameter requirements for this filter media is
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