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<p>In this study, we aimed to safely treat fly ash generated during the incineration-based volume reduction of <sup>137</sup>Cs-contaminated waste from the Fukushima Daiichi Nuclear Power Plant accident by applying SAP to the fly-ash washing process. To enhance the Cs⁺ retention capacity of SAP, we investigated the removal of the interfering element Ca from fly-ash aqueous solutions by inducing CaCO<sub>3</sub> precipitation via CO<sub>2</sub> bubbling. When CO<sub>2</sub> bubbling adjusted the solution pH to an appropriate range, Ca<sup>2+</sup> concentrations decreased through CaCO<sub>3</sub> precipitation, thereby decreasing the distribution coefficient for Ca and enhancing that for Cs. This method is advantageous because it does not require chemical modification of SAP and avoids increasing the electrolyte concentration, which would otherwise reduce SAP water-absorption capacity.</p>

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Enhancing Cs retention in superabsorbent polymers via preferential Ca removal by CO2 bubbling in fly-ash aqueous systems

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月22日

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  • Shogo Higaki,
  • Toru Oishi

摘要

In this study, we aimed to safely treat fly ash generated during the incineration-based volume reduction of 137Cs-contaminated waste from the Fukushima Daiichi Nuclear Power Plant accident by applying SAP to the fly-ash washing process. To enhance the Cs⁺ retention capacity of SAP, we investigated the removal of the interfering element Ca from fly-ash aqueous solutions by inducing CaCO3 precipitation via CO2 bubbling. When CO2 bubbling adjusted the solution pH to an appropriate range, Ca2+ concentrations decreased through CaCO3 precipitation, thereby decreasing the distribution coefficient for Ca and enhancing that for Cs. This method is advantageous because it does not require chemical modification of SAP and avoids increasing the electrolyte concentration, which would otherwise reduce SAP water-absorption capacity.