Waste Water Engineering
Kjeldahl nitrogen is a mixture of

Ammonia and nitrogen
All listed here
Nitrogen and organic nitrogen
Organic nitrogen and ammonia

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Waste Water Engineering
Nitrogen cycle of sewage, is

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

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