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

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

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Waste Water Engineering
The sewer pipes

Are designed for generating self-cleansing velocities at different discharge
All listed here
Should resist the wear and tear caused due to abrasion
Carry sewage as gravity conduits

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