Lim Sol Geo, Oh Chang Yeop, Kim Sun Ha, Ra Kongtae, Yoon Ji-Ho
Department of Convergence Study on Ocean Science and Technology, Ocean Science and Technology (OST) School, Korea Maritime and Ocean University, Busan 49112, South Korea.
Western Seoul Center, Korea Basic Science Institute (KBSI), Seoul 03759, South Korea.
J Hazard Mater. 2024 Jan 15;462:132812. doi: 10.1016/j.jhazmat.2023.132812. Epub 2023 Oct 20.
Here, we introduce CO hydrate-based desalination (CHBD) technology for freshwater recovery from radioactive wastewater, for water particularly containing Cs and Sr. The hydrate equilibrium curves of CO hydrates shift towards lower temperature and higher pressure regions as the concentrations of CsCl and SrCl increase. X-ray diffraction and Raman spectroscopy measurements found that neither CsCl nor SrCl can affect the structure of CO hydrates. The high-pressure micro-differential scanning calorimetric results demonstrate that CO hydrates in the presence of CsCl and SrCl started to dissociate at lower temperatures due to the enrichment of CsCl and SrCl in the remaining solutions. The formation kinetics results indicate that increases in the concentrations of the radioactive chemicals lead to a decrease in the initial reaction rate and sub-cooling temperature. Solid-state nuclear magnetic resonance spectroscopy was utilized to confirm the exclusion of radioactive isotopes from solid gas hydrates. Importantly, the CHBD technology proposed in this study is applicable to radioactive wastewater containing Cs and Sr across broad concentration ranges, spanning from a percent to hundreds of parts per million (ppm), and even sub-ppm levels, with comparable recovery efficiency. This study presents new insights into the potential of environmentally sustainable technologies to overcome the challenges posed by radioactive wastewater.
在此，我们介绍了基于一氧化碳水合物的脱盐（CHBD）技术，用于从放射性废水中回收淡水，特别是含有铯和锶的水。随着CsCl和SrCl浓度的增加，一氧化碳水合物的水合物平衡曲线向更低温度和更高压力区域移动。X射线衍射和拉曼光谱测量发现，CsCl和SrCl均不会影响一氧化碳水合物的结构。高压微差示扫描量热结果表明，由于剩余溶液中CsCl和SrCl的富集，存在CsCl和SrCl时的一氧化碳水合物在较低温度下开始分解。生成动力学结果表明，放射性化学物质浓度的增加导致初始反应速率和过冷温度降低。利用固态核磁共振光谱法确认了放射性同位素被排除在固体气体水合物之外。重要的是，本研究中提出的CHBD技术适用于浓度范围广泛的含铯和锶放射性废水，浓度范围从百分之几到百万分之几百（ppm），甚至亚ppm水平，且回收效率相当。本研究为环境可持续技术克服放射性废水带来的挑战的潜力提供了新的见解。
