Encapsulation of cesium with a solid waste-derived sulfoaluminate matrix: A circular economy approach of treating nuclear wastes with solid wastes

JOURNAL OF HAZARDOUS MATERIALS

卷:416

Article

Li, Jingwei¹  Xu, Dong¹  Wang, Xujiang¹  Liu, Kang²  Mao, Yanpeng¹  Wang, Mengmeng²  Bai, Yun³  Wang, Wenlong¹ 

[1] Shandong Univ, Shandong Engn Lab Solid Waste Green Mat,Sch Energ, Natl Engn Lab Reducing Emiss Coal Combust,Shandon, Engn Res Ctr Environm Thermal Technol,Minist Educ, Jinan 250014, Peoples R China

[2] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China

[3] UCL, Dept Civil Environm & Geomat Engn, Gower St, London WC1E 6BT, England

关键词: Cesium;    Sulfoaluminate matrix;    Industrial solid wastes;    Encapsulation;    Environmental-friendly;   

DOI  :  10.1016/j.jhazmat.2021.126156

来源: Elsevier

【 摘 要 】

It is of great importance to safely dispose nuclear wastes with the development of nuclear industries. Past approaches to this problem have included immobilizing radioactive cesium in Portland cement-based matrices; however, the leaching rates of cesium are relatively high, especially as the leaching temperature increases. This paper explores a high-efficiency and cost-effective approach for encapsulating cesium using a sulfoaluminate cement (SAC) matrix, which was prepared via synergetic use of industrial solid wastes. Leaching results showed that, the apparent diffusion coefficient values of cesium were only similar to 1.4 x 10(-15) cm(2)/s and similar to 5 x 10(-18) cm(2)/s at 25 degrees C and 90 degrees C leaching conditions, respectively. These values were several orders of magnitude lower when compared with previously reported values, indicating the excellent encapsulation performance of the solid waste-based SAC for cesium. Moreover, the heavy metals contained in the industrial solid waste were also effectively immobilized. A mechanistic analysis revealed that cesium was encapsulated in the SAC matrices stably by a physical effect. Finally, a life cycle assessment and economic analysis indicated that this approach was environmental-friendly, cost-effective, and energy-saving. This work provides a promising strategy for effective encapsulation of cesium and synergetic treatment of industrial solid wastes.

【 授权许可】

Free