Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy.
J Hazard Mater. 2011 Jul 15;191(1-3):49-55. doi: 10.1016/j.jhazmat.2011.04.030. Epub 2011 Apr 27.
Salinity generally strongly affects the solubility of carbon dioxide in aqueous solution. This would seem to involve a reduction of the efficiency of the carbonate mineralization process with the objective to sequester this greenhouse gas. On the contrary, we demonstrate here that with a more concentrated solution of magnesium chloride, the residence time of CO(2) is enhanced in the aqueous medium because of a reduced tendency to produce CO(2(g)). Experiments intended to simulate more closely the Mg-rich wastewaters that are industrially available have been carried out using solutions differing in Mg concentration (7, 16, 32 g L(-1) Mg). A comparison of the efficiency of the CO(2) mineralization process among sets of experiments shows that the reduction of the efficiency, to about 65%, was lower than that expected, as the low degree of CO(2) degassing results in the enhanced availability of carbonic ions to react with Mg ions to form stable carbonate minerals over a longer time.
盐度通常会强烈影响二氧化碳在水溶液中的溶解度。这似乎会降低以封存这种温室气体为目的的碳酸盐矿物化过程的效率。相反，我们在这里证明，由于产生 CO(2(g))的趋势降低，用更浓缩的氯化镁溶液，CO(2)在水介质中的停留时间会延长。使用 Mg 浓度不同的溶液（7、16、32 g L(-1)Mg）进行了旨在更紧密地模拟工业上可用的富镁废水的实验。对几组实验中 CO(2)矿化过程效率的比较表明，效率降低约 65%，低于预期，因为 CO(2)脱气程度低会导致碳酸根离子在更长时间内与 Mg 离子反应形成稳定的碳酸盐矿物的可用性增强。
