Biogas is created during the anaerobic decomposition of organic components of biomass, for example cow manure or green waste.
The gases are produced by active microorganisms that only live in the absence of oxygen.
For this, the biomass, e.g. Animal excrement is stored in a brick, underground tank with the addition of water.
In most cases, the solid, yet simple systems built with regionally available materials guarantee a lifespan of well over 20 years.
The first usable biogas is formed about 8 weeks after the system is filled. The excrement of a cow is sufficient to obtain enough biogas for a household, i.e. for everyday use.
Burning the gas produces far less climate-damaging greenhouse gas emissions than burning wood and coal.