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Which of the following process is not involved in the removal of nitrogen?

(a) Nitrification

(b) Ammonification

(c) Denitrification

(d) Desalination

This question was addressed to me in an online interview.

The doubt is from Biological Treatment of Waste Water topic in chapter Biological Treatment of Waste Water of Environmental Biotechnology

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The correct option is (d) Desalination

The explanation: Removal of nitrogen from waste water follows 3 basic steps in the following sequence, ammonification, nitrification and denitrification for the complete removal of nitrogen which would otherwise lead to eutrophication, desalination is a procedure by which salt is removed from water bodies, this step is not followed for nitrogen removal.

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