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Which is the most suitable temperature for the production of methane in anaerobic fermentation?

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Which is the most suitable temperature for the production of methane in anaerobic fermentation?

(a) 32 – 35^oC

(b) 18 – 26^oC

(c) 40 – 48^oC

(d) 10 – 15^oC

I got this question in an internship interview.

This interesting question is from Anaerobic Fermentation in portion Biomass Energy of Energy Engineering

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Correct choice is (a) 32 – 35^oC

Best explanation: A temperature between 32 – 35^oC has proven most efficient for stable and continuous production of methane. Biogas produced outside this range will have a higher percentage of carbon dioxide and other gases than within this range.

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