Korea Institute of Nuclear Non-proliferation and Control, Daejun, 34101, Republic of Korea.
National Research Foundation of Korea, Daejun, 34113, Republic of Korea.
J Environ Radioact. 2024 May;275:107425. doi: 10.1016/j.jenvrad.2024.107425. Epub 2024 Mar 29.
As the need for global decommissioning and site remediation of aging and shut-down nuclear power plants continues to grow, it becomes increasingly crucial to efficiently treat contaminated soil while minimizing waste generation. This study explores an innovative soil decontamination approach that utilizes supercritical carbon dioxide (SCCO₂) as the primary solvent, along with ethanol as a co-solvent and specific additives, including a chelate ligand (catechol ligand) and a co-ligand (NEt₄PFOSA). The advantages of SCCO₂, such as its penetration and solubility, coupled with its ability to separate from radioactive waste, are harnessed in this research. The study demonstrates that the combination of SCCO₂, ethanol, and additives significantly enhances decontamination efficiency, particularly for cesium (Cs), strontium (Sr), and uranium (U) contamination. Results indicate that decontamination efficiency varies with soil particle size, with smaller particles presenting greater challenges. This study presents a promising eco-friendly soil decontamination technology using SCCO₂ containing ethanol and specific additives to efficiently reduce radioactive contamination in soil.
随着全球老旧和关停核电站退役和场址修复需求的不断增长，高效处理污染土壤同时最大限度减少废物生成变得至关重要。本研究探索了一种创新的土壤去污方法，该方法利用超临界二氧化碳（SCCO₂）作为主要溶剂，乙醇作为共溶剂，并使用特定添加剂，包括螯合剂（儿茶酚配体）和共配体（NEt₄PFOSA）。本研究利用 SCCO₂ 的穿透性和溶解性优势，以及其与放射性废物分离的能力。研究表明，SCCO₂、乙醇和添加剂的组合显著提高了去污效率，特别是对于铯（Cs）、锶（Sr）和铀（U）的污染。结果表明，去污效率随土壤颗粒大小而变化，较小的颗粒带来更大的挑战。本研究提出了一种使用含有乙醇和特定添加剂的 SCCO₂ 的有前途的环保土壤去污技术，可有效降低土壤中的放射性污染。
