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

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

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Waste Water Engineering
In the activated sludge process

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

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