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Which of the following is the correct expansion of OLNAD?

(a) Oxygen limited nitrification and denitrification

(b) Oxygen reduced nitrification and denitrification

(c) Oxygen limited ammonification and denitrification

(d) Oxygen reduced nitrification and ammonification

I have been asked this question in examination.

I need to ask this question from Pollutants Environmental Impact topic in section Environmental Impact of Pollutants and Analysis of Dose – Effect Relationship of Environmental Biotechnology

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Correct option is (a) Oxygen limited nitrification and denitrification

Explanation: OLNAD stands for Oxygen limited nitrification and denitrification where ammonia is removed using organic carbon source in a single step, Oxygen reduced nitrification and denitrification, Oxygen limited ammonification and denitrification and Oxygen reduced nitrification and ammonification are not the correct expansion.

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