What is Anaerobic Digestion?

Anaerobic Digestion is a series of processes that decomposes organic materials in the absence of air. The resulting products are:

Biogas - a methane rich gas that typically contains:

  • 60% CH4
  • 39% CO2
  • other trace gases

Digestate is a bio-fertiliser that contains a range of plant nutrients and can be recycled back to land as a fertiliser/soil conditioner.

It is a liquid based system that uses 4-8%; dry matter. Cannington Bioenergy uses food waste in the process of anaerobic digestion.

Anaerobic Digestion Flow Chart

The process of converting this waste means that it is odourless due to the systems being sealed and also carbon neutral.

To date, the waste used at Cannington Bioenergy is converted into enough energy to supply the equivalent of 1,477 houses.

The aim in the forthcoming years is to create enough energy to supply the surrounding villages of Nether Stowey, Spaxton, Cannington, Fiddington, Stogursey and Wembdon - a total of 4,400 homes!