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Which of the following waste produces more gases comparatively?

(a) Vegetable matter

(b) Cow dung

(c) Plant waste

(d) Organic waste from industry

I had been asked this question in a national level competition.

Question is taken from Anaerobic Fermentation topic in division Biomass Energy of Energy Engineering

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Right answer is (a) Vegetable matter

For explanation: Vegetable matter produces about 8 times more gas, so the quantity required is much smaller in batch production for the same gas production from any other wastes. A mixture of dung and vegetable matter is hence ideal in most ways, with a majority of vegetable matter to provide the biogas and the valuable methane contained in it.

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