Seawater desalination has two major negative environmental impacts: brine production/discharge and a large carbon footprint arising from energy consumption. Sequential CO₂ mineralization is a promising technology to address both issues. This paper reports the effects of key reaction parameters in this process, namely additional agitation of the reactant phases, presence of electrolytes, and CO₂ microbubble injection rate. It was found that enhanced mass transport of reactants under agitation and an appropriate CO₂ microbubble injection rate are necessary for effective CO₂ mineralization by precipitating carbonate minerals. Compared to deionized water, various electrolytes in the brine reduced the amount of CO₂ required to achieve the same Mg conversion ratio. However, deionized water led to a much higher purity (98%) of the precipitated hydromagnesite, a valuable product of sequential CO₂ mineralization. This report provides useful guidelines for the design of systems for sequential CO₂ mineralization with seawater desalination brine.

海水淡化有两个主要的负面环境影响：盐水生产/排放和能源消耗产生的大量碳足迹。顺序 CO ₂矿化是解决这两个问题的有前途的技术。本文报告了该过程中关键反应参数的影响，即反应物相的额外搅拌、电解质的存在和 CO ₂微泡注入速率。发现在搅拌下增强反应物的传质和适当的 CO ₂微泡注入速率对于通过沉淀碳酸盐矿物有效的 CO ₂矿化是必要的。与去离子水相比，盐水中的各种电解质减少了 CO ₂的量需要达到相同的镁转化率。然而，去离子水导致沉淀水菱镁矿的纯度更高（98%），这是连续 CO ₂矿化的有价值的产物。本报告为使用海水淡化盐水连续 CO ₂矿化系统的设计提供了有用的指南。