Question

Which processes occur in a biogas plant?

• A. Cow dung, plant residue and sewage are decomposed in the absence of oxygen.
• B. Cow dung is heated in the presence of oxygen.
• C. Plant residues are heated in the presence of oxygen.
• D. Plant residues are burnt in a limited supply of oxygen.

Answer 1

The correct option is A Cow dung, plant residue and sewage are decomposed in the absence of oxygen.

When domestic waste is deposited into a biogas plant, biogas is formed by the action of bacteria in the absence of oxygen. The main constituent of biogas is methane.