Discussion
Match each conversion route in List I with its product in List II.
List I
A. Anaerobic digestion
B. Gasification
C. Fermentation
D. Briquetting
List II
1. Producer gas
2. Biogas and digestate
3. A denser solid fuel
4. Ethanol
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each route is matched to its product. Anaerobic digestion (A) yields biogas and a fertiliser digestate (2); gasification (B) yields producer gas (1) by partial oxidation.
Fermentation (C) yields ethanol (4), and briquetting (D) yields a denser solid fuel (3). The first three are conversions that change the material chemically; briquetting alone is purely physical, which is why its product is still recognisably the residue it started as.
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