Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Citric acid
Sulphuric acid
Nitric acid
Hydrochloric acid

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

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