Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel along its length
The flow of sewage to fill the tank
A particle to travel from top surface to bottom sludge zone
None of these

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Waste Water Engineering
In the activated sludge process

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

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