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What is biogas?

Biogas is a mixture of methane and carbon dioxide, produced by breaking down organic waste by bacteria without oxygen (anaerobic digestion). Bubbles rising from a swampy, marshy area are an example of naturally produced biogas. This methane can be used to cook, like natural gas and liquid petroleum. It can also be used to power combustion engines to drive a motor or generate electricity.

How is biogas made?

Biogas is made by fermenting organic waste in a biogas fermenter. The size of a fermenter can vary from a small household system to a large commercial plant of several thousand cubic meters. Cow dung can be used to feed biogas fermenters, for example.

Simple biogas digester designs have been developed for easy, daily use:
Waste (e.g. cow dung) is fed into the digester through an inlet pipe and undergoes digestion in the fermenter. Temperatures inside have to be between 30-37°C so methane-producing bacteria can work their best. With the REHAU HOMEGAS System, the gas is collected in a separate gas bag following digestion. From there, it flows through a gas pipe to your jiko, which is ready to use for cooking.

Additionally, left-over bioslurry can be removed from an outlet on the fermenter and can be used as fertilizer. This organic fertilizer contains more micronutrients than chemical fertilizer, which replenishes the soil for long lasting fertility and helps increase crop growth and harvest.

What can 1 m³ of biogas do?

  • 1m³ of biogas can be used to light a 60-100 watt bulb for as long as six hours
  • 1m³ of biogas can be used to cook two meals for a family of 5 - 6
  • 1m³ of biogas can replace 0,6 kg of petrol
  • 1m³ of biogas can generate 1,25 kilowatt hours of electricity

Is biogas safe?

Yes! Biogas is completely harmless to inhale. Nevertheless, you would smell biogas if there is a leak. More importantly, biogas poses no danger of explosion. In the worst case, the system would deflagrate. This is highly unlikely and only harmful if it is very close-by.

Please ensure you have good ventilation and undergo all maintenance recommendations, then no problems will occur.