Through a loading process, the biomass that is to be treated is fed into a digester.
Digesters are tanks made of reinforced concrete that can be round or rectangular.
The main activity - anaerobic digestion (when biomass is converted into biogas) takes place within the digester.
The biogas formed is sent to a gasometer (a pressure-switch accumulator for biogas) which absorbs any production variations. This ensures that the power supplied is regulated by the pace at which the biogas is produced.
Once the biogas reaches the cogenerator (engine) it is transformed into:
- Electrical energy, which is transferred to the national grid.
- Thermal energy, used to maintain the process temperature constant and also to heat of some premises (e.g. homes, offices, greenhouses ...).
The remaining waste left over from the entire process is called digestate and is made up of solid and liquid manure.
This by-product can be used as an excellent fertiliser and can be used on fields instead of chemical fertilisers.