Dr Long Ji

Oral presentation: Integration of Bipolar Membrane Electrodialysis with Carbonation for Enhanced CO₂ Mineralisation and Alkaline Recovery

Abstract opening:
Industrial growth and economic expansion remain heavily dependent on carbon-intensive sectors, presenting a substantial challenge in reconciling environmental goals with economic sustainability. Mineral carbonation is a promising carbon dioxide removal (CDR) technology that mitigates industrial emissions by converting CO₂ into stable carbonates. However, non-alkaline wastes such as gypsum (mainly CaSO4∙2H2O) and saline water (CaCl2 and/or MgCl2) require external alkaline chemicals to elevate the solution pH and neutralize the acid generated during the carbonation reaction. Such high chemical consumption and operational costs is hindering the scalable and sustainable deployment of CO₂ mineralisation. Integrating bipolar membrane electrodialysis (BMED) into CO₂ mineralisation can address these challenges by recycling the required alkaline using renewable electricity. This study proposes an amine-promoted carbonation-electrodialysis process, in which amines not only improve mineral carbonation as an alkaline reagent but also enable efficient electrochemical alkaline regeneration by regulating the anion transport…