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

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

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Waste Water Engineering
Nitrogen cycle of sewage, is

Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia

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