Processes H.8 to H.10: Handling the fibre fraction from the farm to the biogas plant before biogas is produced

Life Cycle Assessment of Biogas from Separated slurry

H.8 Storage of the fibre fraction at the farm
H.9 Transport of fibre fraction to biogas plant
H.10 Storage of the fibre fraction at the biogas plant

H.8 Storage of the fibre fraction at the farm

As described in Annex F, section F.8, it is assumed that the storage time for the fiber fraction at the farm is very short (1-3 days) and that there are no significant emissions from this storage. See further description in Annex F.

Accordingly, the fibre fraction after the storage has the same composition as at the outlet of the separator (as presented in table H.2).

H.9 Transport of fibre fraction to biogas plant

The transport of the fibre fraction to the biogas plant in this Annex is identical to the transport of the fibre fraction in Annex F, see section F.9.

It means that the calculations for the transport of the fibre fraction to the biogas plant is calculated for a transportation distance of 10.6 km (based on Laursen, 2009). The fibre fraction is transported by trucks. The transport is modelled by use of the Ecoinvent process “Transport, lorry >32t, EURO3” (Spielmann et al., 2007; table 5-124, p.96).

H.10 Storage of the fibre fraction at the biogas plant

As described in Annex F, the storage time for the fibre fraction at the biogas plant is very short – from a few days to maximum a week – and accordingly, it means that the emissions occurring during the temporal storage of the fibre fraction at the biogas plant are considered as negligible.