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Ocean Alkalinity Enhancement (OAE) emerges as a promising strategy capable of sequestering several gigatons of CO2 annually from the atmosphere and store it in the ocean for extended periods (>1000 years). To achieve this objective, artificial alkalinity is introduced into the surface ocean through alkaline solutions or the spontaneous dissolution of alkaline solids. When contemplating alkaline solids for OAE, a primary challenge lies in generating substantial quantities of fine grained (90m2/g). However, the efficiency of both hydrated carbonates in releasing alkalinity will be further analyzed to elucidate the effect of particle coagulation, particle sinking, and secondary precipitation phenomena. Nonetheless, our pilot results demonstrate that both ikaite and w-ACC are promising candidates for OAE, considering their potential in augmenting ocean alkalinity and CO2 sequestration.1 Renforth, P., Baltruschat, S., Peterson, K., Mihailova, B. D. Hartmann, J. Using ikaite and other hydrated carbonate minerals to increase ocean alkalinity for carbon dioxide removal and environmental remediation. Joule 6, 2674-2679 (2022). https://doi.org/10.1016/j.joule.2022.11.
Baltruschat et al. (Mon,) studied this question.