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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Waste Water Engineering
Skimming tanks are

Improved version of grit chambers
Tanks provided with self- cleansing screens
Those from which sludge is skimmed out
Used to remove the grease and oil

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