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

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

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Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When diluting water is used for water supply near the point of sewage disposed
When the diluting water is having flow currents
When diluting water has high dissolved oxygen content
When sewage is fresh

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