Discussion
Statement I: Wet residues are better suited to anaerobic digestion than to combustion.
Statement II: Drying a wet residue can consume more energy than the residue itself contains.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Anaerobic digestion takes place in water and is indifferent to a wet feedstock; combustion requires the water to be evaporated first, and the latent heat of vaporisation is about 2.3 MJ per kilogram.
For a residue at 85 per cent moisture the drying energy can exceed the energy released by burning what remains, so the process consumes more than it delivers. That crossover is the single most useful rule for choosing a route: wet residues to digestion, dry residues to combustion.
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