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

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

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Waste Water Engineering
The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers
Rectangular septic tanks
Circular septic tanks
Circular Imhoff double tanks with bottom hoppers

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