Anaerobic digestion (AD) is a biological process similar in many ways to composting. It is a natural treatment process and, as in composting, bacteria break down organic matter and reduce its bulk or “mass”.
Unlike composting AD is carried out in an oxygen-free environment (known as anaerobic conditions) to allow the presence of bacteria adjusted to these conditions which then multiply and grow, and by so doing achieve the process aims of:
- sanitisation of the feed material and of any liquid discharged;
- a net positive surplus generation of energy as a biofuel to allow power production from methane gas (biogas) produced by the organisms.
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