Biogas is an energy-rich gas mixture. It is produced by the natural decomposition of organic material in the absence of air. The process is called anaerobic fermentation. In principle, any organic or biological substrate that can be broken down by bacterial processes can be used to produce biogas.
Suitable substrates are:
- Organic waste
- Manure from cattle, pig or chicken
- Agricultural raw materials such as grain, silage, grass etc.
The following diagram shows a simplified description of how a biogas plant works: