Discussion
Consider the following pairs of process and its product:
Anaerobic digestion - Biogas and digestate
Gasification - Producer gas
Fermentation of molasses - Ethanol
Briquetting - A higher calorific value per kilogram
How many of the pairs given above are correctly matched?
Answer: A
Correct answer: Only three
Three pairs are right. Anaerobic digestion yields biogas together with a digestate useful as fertiliser; gasification yields producer gas; and fermenting molasses yields ethanol.
The fourth is wrong. Briquetting compacts the material without changing its chemistry, so the calorific value per kilogram is essentially unaltered. What rises is the value per cubic metre, and that is precisely the point - the problem being solved is one of volume, not of energy content.
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