Waste Water Engineering
Nitrogen cycle of sewage, is

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

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Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When sewage is fresh
When diluting water has high dissolved oxygen content
When the diluting water is having flow currents
When diluting water is used for water supply near the point of sewage disposed

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