Waste Water Engineering
The settlement of a particle in sedimentation tank, is affected by

Size and shape of solid
Velocity of flow
All listed here
Viscosity of water

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

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

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