GENERAL KNOWLEDGE

Detailed explanation-1: -Biogas is a mixture of methane, CO2 and small quantities of other gases produced by anaerobic digestion of organic matter in an oxygen-free environment.

Detailed explanation-2: -Raw biogas contains about 55–65% methane (CH4), 30–45% carbon dioxide (CO2), traces of hydrogen sulphide (H, S), and fractions of water vapour (Stern et al., 1998). Pure methane has a calorific value of 9100 kcal/m3 at 15.5 °C and 1 atm.

Detailed explanation-3: -Biogas consists mainly of methane (CH4) 75% and carbon dioxide (CO2) 25%. Biogas is produced by using organic material, which is broken down with the help of bacteria in an anaerobic environment in the absence of oxygen.

Detailed explanation-4: -Raw biogas typically consists of methane (50–75%), carbon dioxide (25–50%), and smaller amounts of nitrogen (2–8%).

Detailed explanation-5: -Biogas is primarily composed of methane gas, carbon dioxide, and trace amounts of nitrogen, hydrogen, and carbon monoxide. It occurs naturally in compost heaps, as swamp gas, and as a result of enteric fermentation in cattle and other ruminants.