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Expand 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

The question was asked in unit test.

This interesting question is from Biological Treatment of Waste Water in chapter Biological Treatment of Waste Water of Environmental Biotechnology

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Right option is (a) Oxygen limited nitrification and denitrification

The best I can explain: 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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