Associate the capture of CO₂ in industrial smoke and flue gases, its local storage dissolved in the brine of a deep saline aquifer, and the recovery of geothermal energy: a new approach proposed by the CO₂-DISSOLVED project for further valuation of the "CO₂ capture and storage" concept

The objective of the CO₂-DISSOLVED project (CO2 Dependable Injection and Storage System Optimized for Local Valorization of the geothermal Energy Delivered) is to assess the technical-economic feasibility of a novel Carbon Capture and Storage concept integrating aqueous dissolution of CO₂ and injection via a doublet system (i.e. one injection well and one production well), an innovative post-combustion CO₂ capture technology, and geothermal energy recovery. Compared to the use of a supercritical CO₂ phase, this approach offers substantial benefits in terms of storage safety, due to lower brine displacement and no pressure build-up risks, lower CO₂ escape risks, and the potential for more rapid mineralization.

However, the solubility of CO₂ in brine will be a limiting factor to the amount of CO₂ that can be injected. Consequently, and as another contributing novel factor, this project targets low to medium range CO₂-emitters (ca. 10-150 kt/yr), that could be compatible with a single doublet installation. Since it is intended to be a local solution, the costs related to CO₂ transport would then be dramatically reduced, provided that the local underground geology is favorable.

Finally, this project adds the potential for energy and/or revenue generation through geothermal heat recovery. This constitutes an interesting way of valorization of the injection operations, demonstrating that an actual synergy between CO₂ storage and geothermal activities may exist.