Discussion
Consider the following statements about anaerobic digestion:
1. It suits wet residues that could not economically be dried for combustion.
2. It yields biogas of roughly sixty per cent methane.
3. The digestate is a waste requiring disposal.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statement 1 is correct: digestion works in water, so a wet residue is no obstacle where drying for combustion would consume more energy than the material contains. Statement 2 is correct: biogas is typically around 60 per cent methane, the balance mostly carbon dioxide.
Statement 3 is false. The digestate is a useful product, not a waste - it retains the nitrogen, phosphorus and potassium of the feedstock in a stabilised, largely deodorised form and is applied as fertiliser.
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