How Anaerobic Digestion Works

What’s it all about?

Anaerobic Digestion is the process where bacteria break down organic material in the absence of oxygen to make biogas. There is four main stages to this process:


In this process complex proteins and carbohydrates are broken down into smaller molecules of simple sugars and amino acids. The smaller molecules are then available for other bacteria to breakdown.


The small molecules are broken down by the bacteria to make Carbon Dioxide, Ammonia, Hydrogen, Hydrogen Sulfide and other short chain fatty acids.


During this stage the short change fatty acids are further broken down into acetic acid, hydrogen and carbon dioxide


This is the final stage of anaerobic digestion. During this stage of the process methanogenic bacteria  consume the intermediate products produced in the previous stages to produce methane.

The biogas produced is then used to power a CHP unit to generate renewable electricity.