The bio gas consists of methane, carbon dioxide, hydrogen and hydrogen sulfide.
Biogas is usually made up of around 50-70% methane (CH4) and 25-45% carbon dioxide (CO2), with other gases such as hydrogen (H2), hydrogen sulphide (H2S), water vapor (H2O), nitrogen (N2), oxygen (O2), ammonia (NH3) making up the rest.
The exact percentages depend on a range of factors, such as retention time and operating temperature, however a rough estimate is:
- Methane (50-85%)
- Carbon dioxide (5-50%)
- Water vapor (0-10%)
- Hydrogen (0-1%)
- Hydrogen sulphide (0-3%)
- Nitrogen (0-5%)
- Oxygen (0-2%)
Biogas can be used in a range of different ways as an energy source, however the most common (and uses : is directly for heat and/or electricity generation. Biogas can be used as fuel for options such as cogeneration, offering a renewable energy option that is both reducing your carbon footprint and being kinder to the environment.