Discussion
A fruit processing plant produces ten tonnes a day of peel at 85 per cent moisture.
Which utilisation route is most appropriate?
Answer: D
Correct answer: Anaerobic digestion, the peel being far too wet
At 85 per cent moisture the peel is mostly water, and evaporating it would consume about 2.3 MJ per kilogram - more energy than burning the dry matter left behind would release. Every thermal route fails on the same arithmetic.
Anaerobic digestion works in water and needs no drying at all, so a wet feedstock is an advantage rather than an obstacle. It yields biogas for the plant's own heat and a digestate usable as fertiliser. The rule of thumb is simple: wet residues to digestion, dry residues to combustion.
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