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How is potential toxicity, due to ammonia is corrected?

(a) By dilution

(b) By adding urea

(c) By adjusting the temperature

(d) By adding extra carbon rich content

I have been asked this question in final exam.

Question is from Problem involved in Biogas Production topic in portion Biomass Energy of Energy Engineering

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Correct answer is (a) By dilution

To explain: Wastes and biodegradable residue are often accompanied by a variety of pollutants that could inhibit anaerobic digestion. Potential toxicity can be corrected by remedying the C/N ratio of manure by dilution.

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