allerySlurry left over after biogas production is useful because:
AIt dries to give cement across all cases
BIt can be used as a fuel under typical conditions
CIt is a building material
DIt is a high-grade manure rich in nitrogen and phosphorus
Answer & Solution
Correct answer: D. It is a high-grade manure rich in nitrogen and phosphorus
1. Anaerobic digestion in a biogas plant breaks down organic matter.
2. The slurry left after digestion still contains useful nutrients.
3. It is rich in nitrogen, phosphorus and other minerals.
4. Farmers spread it on fields as a high-quality manure.
5. So the slurry is valuable as a fertiliser.
_Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_
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