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Which of the following process is leads to removal of nitrogen gas from water?

(a) Nitrification

(b) Ammonification

(c) Denitrification

(d) Desalination

I have been asked this question during an interview.

My doubt is from Nitrogen Removal During Wastewater Treatment in division Bacterial Metabolism in Wastewater Treatment Systems of Environmental Biotechnology

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The correct answer is (c) Denitrification

To explain I would say: Removal of nitrogen gas from waste water i.e. the final step is called as denitrification, ammonification is conversion into ammonia, nitrification is conversion into nitrate and denitrification is conversion of nitrate and for the complete removal of nitrogen into atmosphere denitrification step is followed 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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