Discussion
Three of the following are thermochemical routes. Which is biological?
Anaerobic digestion
Direct combustion
Gasification
Pyrolysis
Answer: B
Correct answer: Anaerobic digestion
Anaerobic digestion is a biological process: a mixed microbial population breaks the organic matter down in the absence of oxygen, producing methane and carbon dioxide over days to weeks at modest temperature.
The other three are thermochemical, using heat to transform the material. Combustion oxidises it fully to carbon dioxide and water; gasification uses a restricted oxygen supply to produce a combustible gas; pyrolysis heats it without oxygen to give char, oil and gas. The biological route is the one that tolerates a wet feedstock.
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