Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.01 mm
Less than 0.1 mm
Greater than 0.1 mm
Less than 0.05 mm

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

Sedimentation tanks with high rate trickling filters
A sedimentation tank and an activated sludge treatment plant
A plant consisting of Imhoff tanks with low rate trickling filters
None of these

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