Waste Water Engineering
If q is the average sewage flow from a city of population P, the maximum sewage flow

Q = [(18 + P)/(4 + )] q
Q = [(5 + )/((15 + )] q
Q = [(4 + )/(18 + )] q
Q = [(18 + )/(4 + )] q

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Waste Water Engineering
In the activated sludge process

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

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