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The transboundary transportation of carbon dioxide (CO2) gives rise to international legal issues not faced in other standalone carbon capture and storage (CCS) projects or domestic projects. While the European Union CCS Directive establishes a framework for CCS, it does not address specifically the issue of transboundary transportation. This will require participating Member States to agree a statutory framework for CO2 transport, which addresses issues at the international, national and local levels of law. This paper considers several key issues for developing and resolving legal issues around ownership and risk for CO2 transportation, an area with limited research literature to date. The legal challenges are examined using a ‘pilot’ project to explore and highlight specific examples. The research draws from a series of CCS industry stakeholder meetings and analysis was developed through interdisciplinary perspectives. In addition, the potential partnership arrangements are explored from a law and policy perspective with an examination of the key issues for these partnerships for Member States. Finally, this research presents a timeline for a legal strategy on resolving the issues for risk and ownership for CO2 transport. [ABSTRACT FROM AUTHOR]

Current specifications on carbon dioxide (CO 2 ) storage do not take into account the effect of oxygen (O 2 ) present as an impurity, on storage site microbiology. Some microbiology related impacts related to the CCS process include the potential blockage of injection well, corrosion of pipes, oil souring and oil degradation. To investigate this, microcosm experiments were set up using the O 2 concentrations of 0 ppm, 10 ppm, 100 ppm and atmospheric. Artificial groundwater and sandstone microcosms were inoculated with a mixed microbial community, incubated for 29 days and regularly sampled for gases produced and sampled at the end of the experiment to analyse the microbiology. Gas chromatography analysis of these microcosms showed no hydrogen sulphide (H 2 S) production and a variable amount of CO 2 production. Microbial analysis of the microcosms show that the microbial inoculum (including sulphate reducing bacteria) was able to survive/grow better in the microcosms with 10 ppm and below compared to the higher levels of O 2 . The levels of CO 2 for 100 ppm and atmospheric levels of O 2 were similar indicating the introduction of 100 ppm of O 2 could promote aerobic processes. This experiment has shown that small differences in O 2 concentrations affects microbial communities relevant to geological storage sites which could cause operational issues. Further investigation is required to properly assess the effect of small O 2 changes on H 2 S production. [ABSTRACT FROM AUTHOR]