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Sammanfattning

Carbon capture and storage (CCS) of CO2 from biogas upgrading units has been proposed as a way to achieve negative CO2 emissions. This study evaluated the climate performance and energy efficiency of such a bio-CCS system from a life cycle perspective, encompassing management, transport and storage of the separated biogenic CO2. The results demonstrated a climate impact of 0.10 tonne CO2-eq emitted/tonne CO2 captured, corresponding to 90% carbon efficiency. Relative to biogas production, the emissions from the CCS value chain amounted to 3.9 g CO2-eq/MJ biomethane, with an energy demand of 0.056 MJ/MJ biomethane or 1450 MJ/ tonne captured CO2. On adding the benefit of stored carbon (-38 g CO2/MJ biomethane) to an emissions factor for Swedish biogas from bio-based waste, its value decreased to-15.4 CO2-eq/MJ biomethane. Sensitivity analyses highlighted the importance of utilising renewable energy sources, but also showed that a clear net-negative emissions balance can be achieved even under non-ideal circumstances, such as for long transport distances and fossil-based energy supply. These results indicate that coupling a CCS system to biogas upgrading has the potential to deliver net-negative greenhouse gas emissions, even with conservative assumptions regarding renewable energy availability and large transport distances relative to the small CO2 volumes mostly available from biogas systems.

Nyckelord

LCA; Climate impact; Biomethane

Publicerad i

Energy Reports
2026, volym: 15, artikelnummer: 109047

SLU författare

UKÄ forskningsämne

Bioenergi

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.egyr.2026.109047

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/146583