Processes H.11 to H.14: Handling the raw slurry input for biogas: from in-house storage to storage at the biogas plant.

Life Cycle Assessment of Biogas from Separated slurry

H.11 In-house storage of raw slurry
H.12 Storage of raw slurry in pre-tank
H.13 Transport of raw slurry to biogas plant
H.14 Storage of the raw slurry at the biogas plant

H.11 In-house storage of raw slurry

The assumptions and Life Cycle Inventory data for the storage of slurry in the housing units are the same as for the reference scenario (section A.2, Annex A), and thereby the same as described in section H.2.

H.12 Storage of raw slurry in pre-tank

This process is identical to the process described in section H.2. Therefore, the same life cycle data applies here.

H.13 Transport of raw slurry to biogas plant

As described in Annex F, section F.13, a distance of 5 km from the farm to the biogas plant is taken into account for the transport of untreated slurry to the biogas plant.

H.14 Storage of the raw slurry at the biogas plant

As described in Annex F, section F.14, the raw slurry is stored at the biogas plant for a rather short time, since the storage capacity available at the biogas plant is limited. Therefore, no emissions were considered for this temporal stage. The composition of the raw slurry is therefore the same as the ex-housing slurry of the reference scenario, see table H.1.