Question

The main constituent of biogas is:

• A. butane
• B. ethane
• C. methane
• D. alcohol

Answer 1

The correct option is C

methane

Biogas is produced under anaerobic conditions. The process is denominated as anaerobic digestion which involves the action of methanogens. Methanogens are the group of anaerobic bacteria which breakdown the organic compounds into methane and hydrogen gases. The major constituent of biogas is methane (55-70%). It also contains ${CO}_2$ (30-45%) and some traces of gases such as $H_{2}S$ and ammonia.