Discussion
What is incorrect about the mechanism of organic matter conversion to biogas in anaerobic digestion system ?
Answer: D
The incorrect step is the methane oxidation process.
Anaerobic digestion converts organic matter to biogas in four stages: hydrolysis of complex polymers into sugars, amino acids and fatty acids; acidogenesis into volatile fatty acids; acetogenesis into acetate, hydrogen and carbon dioxide; and methanogenesis, in which archaea produce methane.
Methane oxidation is the opposite of what a digester does: methanotrophic bacteria consume methane, mostly with oxygen, so it would reduce biogas yield. Hydrolysis, acetogenesis and methanogenesis are all genuine stages of the process.
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