Biogas consists of mainly

Biogas is a renewable fuel produced through the anaerobic decomposition of organic matter, such as cattle dung, farm waste, and human waste [2]. It is primarily composed of methane (CH4) and carbon dioxide (CO2). Methane is the principal constituent, typically accounting for 45% to 85% of the total volume, while carbon dioxide makes up approximately 15% to 45%. Other trace gases like hydrogen sulfide, nitrogen, and hydrogen may also be present in small quantities [3]. While natural gas also contains methane as its major constituent (80-90%), it includes higher hydrocarbons like ethane, propane, and butane, which are generally absent or found only in negligible traces in raw biogas. Because methane is the primary element responsible for its high thermal efficiency and energy content, it is considered the main component of biogas [3].

Sources

1. [1] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > Biogas > p. 117
2. [2] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > Biogas > p. 118
3. [3] https://www.sciencedirect.com/science/article/abs/pii/S0360319922004797