Waste Water Engineering
A circular sewer section is preferred to because

All listed here
It is cheaper in construction
It provides maximum area for a given perimeter
It provides maximum hydraulic mean depth

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Waste Water Engineering
In the activated sludge process

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

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