Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Full depth
Two third full
Half full
Three fourth full

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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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