Question

Biogas plant is more useful than burning of dung cakes because

• A. It is non-pollutant.
• B. It yields manure as well as fuel gas.
• C. It yields important biochemicals.
• D. Both A and B.

Answer 1

The correct option is D Both A and B.

Biogas plant produces both biogas and manure from the decomposition of waste material or organic matter. Biogas has a high calorific value than cow dung cakes. Calorific value of methane is about 5.5 KJ/g while for cow dung cakes is about 3.1 KJ/g. Moreover, biogas does not produce any pollutant like cow dung cakes produce carbon dioxide on burning. Neither biogas leaves any ash or soot after burning. Hence, biogas is a non pollutant.

So, the correct answer is 'Both A and B'.