酸盐 (生物) 矿化 修复90Sr污染的地下水
Callum Robinson1, Samuel Shaw1, Jonathan R Lloyd1
1Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, U.K.
ACS ES&T water
|October 19, 2023
概括
酸沉有效地使受污染的地下水中的-90 (Sr) 不动. 微生物介导和非生物方法显示出显著的Sr去除,为核现场整治提供了解决方案.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 历史上核操作造成了广泛的放射性污染土地.
- -90 (Sr) 是核设施地下水中的一个重要的放射性核素污染物.
- 酸相可以吸附并结合像Sr.这样的放射性核素.
研究的目的:
- 评估微生物介导和非生物酸盐沉技术,以从污染的地下水中去除酸盐.
- 为了比较Ca-酸盐/Na-酸盐,甘酸盐和多酸盐修改剂的疗效.
- 为了确认沉积物中Ca-酸盐相内的Sr固定.
主要方法:
- 使用稳定的 Sr,与地点相关的地下水和沉积物进行批量实验.
- 测试两种微生物介导 (Ca-酸盐/Na-酸盐,甘油酸盐) 和一种非生物 (多酸盐) Ca-酸盐生成的处理方法.
- 使用扫描电子显微镜 (SEM) 和X射线吸收光谱 (XAS) 的分析.
主要成果:
- 与对照组相比,所有经过测试的修改都提高了Sr从溶液中去除的效果.
- 酸/纳酸实现了97%的Sr去除,甘酸达到60%,聚酸达到55%.
- SEM和XAS证实了沉积在沉积物颗粒上的Sr沉积和纳入Ca-酸盐相.
结论:
- 产生酸盐的处理方法对污染的地下水中Sr的固定有效.
- 微生物介导的技术显示出在核设施中-90修复的高潜力.
- 这些方法为管理传统放射性污染提供了有价值的工具.
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