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The major disadvantage of heterotrophic nitrification is ____________ for final disposal.

(a) excess sludge generation

(b) less sludge generation

(c) presence of oxygen

(d) presence of carbon source

This question was posed to me during an interview for a job.

This intriguing question originated from Biological Treatment of Waste Water topic in division Biological Treatment of Waste Water of Environmental Biotechnology

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Best answer
The correct choice is (a) excess sludge generation

To elaborate: Heterotrophic bacteria nitrifies the oxidation of inorganic and organic reduced forms of Nitrogen to nitrate which is known as heterotrophic nitrification, excess sludge generation creates a problem and is a major disadvantage of heterotrophic nitrification, whereas, less sludge generation would not create a problem for heterotrophic nitrification, oxygen is required for oxidation process, so, that wouldn’t create a problem, suitable carbon source is required for heterotrophic nitrification.

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