在土岩系统中Se ((VI) 的生物地球化学命运与处置高水平放射性废物有关
Max Rose1, Samuel Shaw1, Katherine Morris1
1RAdioactive waste Disposal and Environmental Remediation (RADER) National Nuclear User Facility and Williamson Research Facility for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Environmental science & technology
|January 26, 2026
概括
班托尼特粘土中的微生物群体可以将移动-VI降解为不溶性-0或铁化,从而增加深层地质放射性废物处理中-79的保留.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 微生物学 微生物学
- 核废物管理 核废物管理
背景情况:
- -79是氧化条件下的放射性废物中的移动放射性核化物.
- 深层地质处置旨在隔离放射性废物,需要了解放射性核体的行为.
- 托尼特粘土是地质处置的候选缓冲材料.
研究的目的:
- 调查本土微生物群落在本托尼特中对-VI的生物减少.
- 评估电子捐赠体 (乳酸盐,H2) 和容器材料 (钢) 对命运的影响.
- 在这个过程中识别微生物种群和物种化.
主要方法:
- 无毒批量微观宇宙化与本托尼特,人工地下水,和钢质优惠券.
- 添加乳酸盐或H2气体作为电子捐赠体.
- 16S rRNA基因测序用于微生物社区分析.
- 扩展的X射线吸收细结构 (EXAFS) 对于的特异化.
主要成果:
- -VI在7-14天内被生物降解和去除,这取决于电子捐赠者.
- 添加乳酸盐导致随后的硫酸盐减少由Desulfosporosinus spp.
- 气体H2减缓了Se(VI) 生物还原的速度,而硫酸盐还原的速度很小.
- 单性Se(0) 最初形成,在钢的存在下演变为三角形Se(0) 或FeSe2.
- 亚热杆菌 spp. 的存在. 在Se(VI) 减少过程中占主导地位.
结论:
- 本土的本托尼特微生物群落有效地将移动的Se (VI) 减少到不易溶解的Se (0) 和FeSe2.2.
- 这些生物还原过程对于在深层地质处置中增强-79的保留至关重要.
- 的命运取决于电子捐赠者的可用性和与容器材料的相互作用.
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