Seo Seong Deok, Truong-Lam Hai Son, Jeon Changsu, Han Jihoon, Kang Kyung Chan, Lee Seungmin, Lee Ju Dong
Offshore Plant Resources R&D Center, Korea Institute of Industrial Technology, Busan 46744, Republic of Korea.
Offshore Plant Resources R&D Center, Korea Institute of Industrial Technology, Busan 46744, Republic of Korea; Faculty of Chemistry, University of Science, Vietnam National University Ho Chi Minh City, Ho Chi Minh 70000, Viet Nam.
J Hazard Mater. 2024 Jan 15;462:132700. doi: 10.1016/j.jhazmat.2023.132700. Epub 2023 Oct 2.
This study investigates the removal characteristics of a hydrate-based water purification process used to remove the major radionuclides monitored in nuclear accident areas. The effect of the coexistence of salt ions on the removal of radioactive materials is also evaluated. Previous studies have found existing processes such as ion exchange and membrane separation to be reliable methods for radionuclide removal from contaminated water. However, these processes cannot remove all contaminants at once and cause additional environmental problems by generating secondary wastes. In a previous study, we observed that water purification by the gas hydrate process could simultaneously remove various ions from seawater and hypersaline water in a single step without pre- or post-treatment. Therefore, the removal characteristics of Sr, Co, Cs, and I radionuclides are evaluated in only one context: the hydrate-based water purification process. More than 85% of the total ions were simultaneously removed regardless of the presence or absence of coexisting ions, and the time required for the removal process was about 70 min. In addition, it was observed that most of the contaminant ions were attached to hydrate crystal surfaces. Therefore, an efficient purification process is proposed that includes a hydrate crystal exterior partial dissolution step.
本研究调查了用于去除核事故区域中监测到的主要放射性核素的水合物基水净化工艺的去除特性。还评估了盐离子共存对放射性物质去除的影响。先前的研究发现，离子交换和膜分离等现有工艺是从受污染水中去除放射性核素的可靠方法。然而，这些工艺不能一次性去除所有污染物，并且会通过产生二次废物而引发额外的环境问题。在先前的一项研究中，我们观察到气体水合物工艺进行水净化可以在一步操作中同时从海水和高盐水中去除各种离子，无需进行预处理或后处理。因此，仅在水合物基水净化工艺这一背景下评估锶、钴、铯和碘放射性核素的去除特性。无论是否存在共存离子，超过85%的总离子被同时去除，且去除过程所需时间约为70分钟。此外，观察到大多数污染物离子附着在水合物晶体表面。因此，提出了一种高效净化工艺，其中包括水合物晶体外部部分溶解步骤。
