which is normally 40% CO2 and 60% methane. This is usually burnt to produce heat and electricity, but can also be stored in liquid form for use as a vehicle fuel.
the solid material left over. A very high quality stable soil conditioner, this can be spread straight to land or stacked for later use. It is resistant to leaching and can be stacked on fields. The nitrogen within has a low availability, and repeated applications can build up a high level of slow release soil fertility. Digestate can also be simply processed into biomass briquettes or pellets enabling it's use in biomass heating systems.
the liquid left over. This is a super concentrated liquid fertiliser that (subject to inputs) is appropriate for use on organic as well as conventionally cultivated land. The analysis will depend upon inputs, but can be tailored by selecting food waste types.