Waste Water Engineering
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in

Bazin’s formula
Chezy’s formula
Manning’s formula
Kutter’s formula

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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Waste Water Engineering
In the activated sludge process

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

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