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

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

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Waste Water Engineering
In the activated sludge process

Aeration is continued till stability
Aeration is done with an admixture of previously aerated sludge
Water is removed by centrifugal action
Sludge is activated by constant stirring

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