It can be produced from a variety of raw materials such as agricultural waste, manure, plant material, sewage, green waste and food waste.
Trace contaminants including Hydrogen Sulphide (H2S), Ammonia (NH3), and volatile organic compounds (VOCs) may be present in the raw biogas and in varying concentrations, depending on the feedstocks.
How is Biogas produced?
Biogas can be produced in landfill sites and is generally referred to as landfill gas.
Methane has a global warming potential of approximately 25 times that of CO2, so from landfill sites, the gas must be either flared, or utilised to generate heat and power via a CHP (combined heat and power) plant.
Commercially-produced biogas is generated in the more controlled environment of an anaerobic digestion (AD) plant.
Feedstocks to anaerobic digestion plants may be from a range of organic feedstocks including energy crops, sewage, municipal waste, and agricultural waste.
Biogas - a renewable energy source
Biogas is a renewable energy source which can be used to generate heat and electricity via a CHP, or as an alternative to natural gas and as a transport fuel after upgrading to biomethane.
The production of biogas offers manufacturers, farmers, local authorities and utility companies an alternative disposal route for their organic waste compared to dumping it into landfill as well as a potential revenue stream.
The production of biogas from anaerobic digestion represents, subject to feedstock availability, a continuous source of renewable energy, avoiding the intermittency that some other sources of renewable energy suffer from.