Ion exchange resins destruction in a stirred supercritical water oxidation reactor

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• 作者：A. Leybros ; A. Roubaud ; P. Guichardon ; O. Boutin
• 关键词：Supercritical water oxidation ; Co-fuel ; Ion exchange resins ; Temperature dependence ; Counter ion
• 刊名：The Journal of Supercritical Fluids
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：51
• 期：3
• 页码：369-375
• 全文大小：724 K

文摘

Spent ion exchange resins (IERs) are radioactive process wastes for which there is no satisfactory industrial treatment. Supercritical water oxidation offers a viable treatment alternative to destroy the organic structure of resins, used to remove radioactivity. Up to now, studies carried out in supercritical water for IER destruction showed that degradation rates higher than 99 % are difficult to obtain even using a catalyst or a large oxidant excess. In this study, a co-fuel, isopropanol, has been used in order to improve degradation rates by initiating the oxidation reaction and increasing temperature of the reaction medium. Concentrations up to 20 wt % were tested for anionic and cationic resins. Total organic carbon reduction rates higher than 99 % were obtained from this process, without the use of a catalyst. The influence of operating parameters such as IERs feed concentration, nature and counterions of exchanged IERs were also studied.