Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

225 mm dia
100 mm dia
150 mm dia
All of these

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Waste Water Engineering
In the activated sludge process

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

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