The biogas that is generated is made mostly of methane, the primary component of natural gas. Recovered biogas can be an energy source for electricity, heating or transportation fuel. The solid waste then falls down the digestion chamber and can be used to make organic fertiliser.
Every tonne of food waste recycled by anaerobic digestion as an alternative to a landfill can reduce greenhouse gas emissions, one of the many benefits of anaerobic digestion. Some types of organic matter break down more easily than others.
Generally, the more “digestible” the organic matter is, the more biogas can be produced.
The Outputs Of Anaerobic Digestion
Anaerobic digestion produces biogas and digestate.
The biogas produced is composed primarily of methane (CH4), varying from 50 to 75 percent. The other components of the biogas produced is carbon dioxide (CO2), hydrogen sulfide (H2S), water vapour and traces of other gases.
This gas can then be purified further to create renewable natural gas (RNG), which has a concentration of methane at 90% or higher. This is done by removing the carbon dioxide, hydrogen sulfide, water, or other components.
Digestate is the solids and liquids left over after the digestion process. They can have their own uses and applications, such as nutrient-rich fertiliser, animal bedding, a base for creating bioplastics and other bio-based products, and much more.
To help with the performance process and for anaerobic plants to operate effectively they require a variety of nutrients for the micro-organisms to grow and function properly. See OMEX range of trace element additives.