Question

Match each part of a biogas plant with the correct options (either process involved or gases produced).

• A. Anaerobic
• B. Biogas formation
• C. Slurry formation
• D. Methane emission

Answer 1

The plant has a dome-like structure built with bricks. A slurry of cow-dung and water is made in the mixing tank from where it is fed into the digester. The digester is a sealed chamber in which there is no oxygen. Anaerobic micro-organisms that do not
require oxygen decompose or break down complex compounds of the cow-dung slurry. It takes a few days for the decomposition process to be complete and generate gases like methane, carbon dioxide, hydrogen and hydrogen sulphide. The bio-gas is stored in the gas tank above the digester from which
they are drawn through pipes for use.