Desalination plants could become net absorbers (rather than net emitters) of CO2. Thermal decomposition of salts in desalination reject brine can yield MgO which, added to the ocean, would take up CO2 through conversion to bicarbonate. The process proposed here comprises dewatering of brine followed by decomposition in a solar receiver using a heliostat field.
P. A. Davies, Environ. Sci.: Water Res. Technol., 2015, 1, 131 DOI: 10.1039/C4EW00058G
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