The biogas comes to be a combustible gas that is generated in specific devices, or in natural media from the different reactions of biodegradation suffered by organic matter , through the action of microorganisms as well as of other factors in the absence of air.
This resulting gas consists of a 29% carbon dioxide (CO2), 60% methane (CH4) , and other gases although in smaller quantities than the previous ones. The main one is methane , and it is this gas that serves as fuel.
It occurs because the microorganisms we talked about earlier , anaerobic bacteria, mainly, can feed on organic matter, and the product of their digestion are these gases that we discussed earlier. All this is done in the absence of oxygen.
The organic matter we are talking about may be debris of agriculture, manure, municipal waste, food waste, vegetables, etc. Biodegradable materials, which can ferment after the action of bacteria.
What can biogas be used for?
The production of biogas by decomposition without air (decomposition) anaerobic) is a useful way to treat biodegradable waste, since it produces a valuable fuel (methane), and generates a waste that can be applied as a generic fertilizer or soil conditioner.
This type of gas can also be used to produce electrical energy by means of turbines or gas generating plants, as well as stoves, dryers, furnaces, boilers or other gas combustion systems.
Methane can be compressed in the same way as gas natural that we use to warm up. This can be used in the engines of cars, like the CNG. In countries like Sweden, Switzerland and Germany, it is widely used in public transport, and also in private transport.