The High Efficiency Digester (HED) is an anaerobic digestion system, available in different sizes depending on the requirements of the farm.
Biogas is generated by an anaerobic digestion process, which is the decomposition of organic matter in absence of oxygen by different bacteria. Biogas is produced during three phases.
Fermentative bacteria convert insoluble material as carbohydrates, fats and proteins into soluble substances (smaller molecules). However, some fibrous material cannot be fermented. These can accumulate in the fermenter or pass through the fermenter even though it is intact.
At this stage, the products of the hydrolysis are converted by acetogenic bacteria into acetic acid, hydrogen and carbon dioxide.