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Below which temperature the action off digesting bacteria decreases?

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Below which temperature the action off digesting bacteria decreases?

(a) 16^oC

(b) 35^oC

(c) 28^oC

(d) 0^oC

I had been asked this question during an internship interview.

The question is from Anaerobic Fermentation topic in chapter Biomass Energy of Energy Engineering

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Correct answer is (a) 16^oC

For explanation: Anaerobic breakdown of waste occurs at temperatures lying between 0^oC and 69^oC, but the action of digesting bacteria will decrease sharply below 16°C. Production of gas is most rapid between 29^oC and 41^oC.

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