Abstract
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.
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