Question

Why biogas is a better fuel than animal dung? Please provide explanation.

Answer 1

Biogas is better than animal dung as a fuel because of the following reasons:

• Animal dung cake has a much lower calorific value (3700 J/g) than biogas (35000 J/g).
• Biogas is a clean fuel that burns without smoke and leaves no ash, unlike animal dung.
• The by-product of biogas plants i.e. the spent slurry, being rich in nitrogen and phosphorus is a good manure.