AD is a treatment for organic and naturally biodegradable materials, ensuring that they contribute to the circular economy. These include:
- Manure and farm waste
- Food processing by-products
- Sustainably grown crops
The materials are blended to form a feedstock and fed into a large, sealed tank (a digester). The tank doesn’t contain oxygen, but is instead filled with naturally occurring micro-organisms and bacteria. This mixture is heated and gently stirred for several days enabling the bacteria to break down the feedstock. During this process, the material emits a gas known as biogas which is extracted and sent to a storage dome. From here, the gas is sent to generate renewable gas and electric energy.