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Assessment of Metal and Chlorine Emissions from Molten Salt Oxidation using Laser-Induced Breakdown Spectroscopy

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Abstract

Molten salt oxidation is used by the U.S. military and other organizations as a treatment process for waste and demilitarized propellants, mixed wastes, and hazardous wastes. In this process, a salt such as sodium carbonate is heated above its melting point, and the waste is introduced into the molten salt bath, where it oxidizes. Benefits to this technology include the high thermal mass of the salt, which enhances the stability of the oxidation process in comparison with traditional combustion processes, the controllable residence time in the salt bath, and the chemical and physical characteristics of the salt. Salts such as sodium carbonate tend to bind chlorine (Na2CO3 + 2Cl => 2NaCl + CO2 +0.5O2), significantly reducing acid gas emissions and potentially preventing dioxin and furan formation downstream. In addition, the high surface area of the bubbles formed during the oxidation process may trap particulate matter, reducing particulate and toxic metal emissions.

© 2002 Optical Society of America

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