Bio-gas is an excellent fuel as it contains up to 75% methane. It burns without smoke, leaves no residue like ash in wood, charcoal and coal burning. Its heating capacity is high. Bio-gas is also used for lighting.@#@

Main Constituent of Biogas:

Biogas primarily consists of methane, which is the key component responsible for its energy-producing properties. Here is a detailed explanation:

Methane:
- Methane (CH4) is the main constituent of biogas, typically making up 50-70% of its composition.
- It is a greenhouse gas but burning it for energy production in biogas plants helps in reducing its environmental impact.
- Methane is a potent energy source and can be used for cooking, heating, and generating electricity.

Other Components:
- Apart from methane, biogas also contains carbon dioxide (CO2) as a secondary component (around 30-40%).
- In addition, small amounts of hydrogen (H2) and hydrogen sulphide (H2S) may be present in biogas, but their concentrations are usually minimal.

Production Process:
- Biogas is produced through the anaerobic digestion of organic matter such as food waste, agricultural residues, and sewage.
- During this process, bacteria break down the organic material in the absence of oxygen, releasing methane and carbon dioxide as byproducts.

Benefits of Biogas:
- Biogas is a renewable energy source that helps in reducing greenhouse gas emissions and dependence on fossil fuels.
- It provides a sustainable way of managing organic waste while producing clean energy for various applications.

In conclusion, methane is the primary constituent of biogas, making it a valuable source of renewable energy with environmental benefits.