Question

Biogas is better fuel than animal cow dung cakes justify this statement stating three reasons.

Answer 1

1.Cow dung cake has low calorific value i.e. 3.1kJ/g than the Methane gas (5.5kJ/g), a biogas constituent.
2.Bio gas is a clean fuel that burns without smoke and leaves no ash, unlike cow dung.
3.The by-product os biogas plants i.e. the spent slurry, being rich in nitrogen and phosphorus is a good manure.

Answer 2

Biogas is better fuel than animal cow dung cakes. Justify this statement.

1. It doesn't leave any ash after burning.
2. It burns with smokeless flame.
3. It has higher calorific value than dung-cake, wood & coal.
4. It is much cheaper than most of the common fuel.
5. Use of Biogas as a fuel will save forests and fossil fuels.