Biogas is a mixture of gases produced through the anaerobic digestion of organic matter. The gas consists mainly of methane, carbon dioxide, and small amounts of other gases, such as hydrogen sulphide and ammonia, as shown in the following table.

Components	Symbol	Concentration
Methane	CH₄	55 – 77%
Carbon Dioxide	CO₂	35 – 45%
Water (vapour)	H₂O	2% (20°C) – 7% (40°C)
Hydrogen Sulphide	H₂S	20 -20,000 ppm (2%)
Nitrogen	N₂	< 2%
Oxygen	O₂	< 2%
Hydrogen	H₂	< 1%
Ammonia	NH₃	< 0.05%

Composition of Biogas (Vögeli Y., 2014)

Methane is a component of biogas. It can serve as a renewable energy source for various purposes, such as cooking, lighting, heating, cooling, electricity generation, and vehicle fuel. It is a sustainable alternative to fossil fuels and can help reduce greenhouse gas emissions.

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