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Πέμπτη 17 Αυγούστου 2017

Utilization of waste bittern from saltern as a source for magnesium and an absorbent for carbon dioxide capture

Abstract

During solar salt production, large quantities of bittern, a liquid by-product containing high inorganic substance concentrations, are produced. The purpose of this research was to examine the utilization of waste bittern generated from salterns as a source for Mg production and as an absorbent for carbon dioxide (CO2) capture. The study was conducted in a sequential two-step process. At NaOH/Mg molar ratios of 2.70–2.75 and pH 9.5–10.0, > 99% Mg precipitation from the bittern was achieved. After washing with water, 100–120 g/L of precipitate containing 94% Mg(OH)2 was recovered from the bittern. At the optimum NH4OH concentration of 5%, 120 g of sodium bicarbonate precipitate per liter of bittern were recovered, which was equivalent to 63 g CO2 captured per liter of bittern. These results can be used to support the use of bittern as a resource and reduce economic losses during solar salt production.



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