Computer · Environmental Engineering
A hypothetical multimedia filter, consisting of anthracite particles (specific gravity: 1.50), silica sand (specific gravity: 2.60), and ilmenite sand (specific gravity: 4.20), is to be designed for treating water/wastewater. After backwashing, the particles should settle form ing three layers: coarse anthracite particles at the top of the bed, silica sand in the middle, and small ilmeni te sand particles at the bottom of the bed. Ass ume: (i) Stoke's law is applicable, (ii) All particles are spherical, (iii) Diameter of silica sand particles is 0.20 mm. The correct option fulfilling the diameter requirements for this filter media is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1diameter of anthracite particles is slightly less than 0.35 mm and diameter of ilmenite particles is slightly greater than 0.141 mm.✓
- 2diameter of anthracite is slightly greater than 0.35 mm and diameter of ilmenite particles is slightly less than 0.141 mm.
- 3diameter of anthracite is slightly greater than 0.64 mm and diameter of ilmenite particles is slight ly less than 0.10 mm.
- 4diameter of anthracite particles is slightly less than 0.64 mm and diameter of ilmenite particles is slightly less than 0.10 mm.
Correct answer
diameter of anthracite particles is slightly less than 0.35 mm and diameter of ilmenite particles is slightly greater than 0.141 mm.
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