The waste that arrives at the plant is pre-treated by a hammer mill, which homogenises the substrate, allowing it to be pumped and, most importantly, eliminating almost all impurities.
The material is then stored in suitable pre-tanks, from where it is automatically pumped into the fermenters, which work in series. At the end of the process, the digestate is pasteurised as required by local laws. The liquid part is then immediately used as a soil conditioner, without further processing; the separated solids are instead sent to the neighbouring composting plant.
The biogas produced is sent to the PSA upgrading plant, which converts it into a gas virtually indistinguishable from natural gas of fossil origin, ready to be injected into the local gas mains.