在经过5年的自然花岩地下水暴露后,在压缩的顿岩中稳定的微生物群落
Katja Engel1, Sian E Ford2, W Jeffrey Binns3
1Department of Biology, University of Waterloo , Waterloo, Ontario, Canada.
mSphere
|September 29, 2023
概括
微生物群落在五年内保持稳定,在深层地质仓库的紧的顿岩壁垒内保持稳定. 这种稳定性对于核废弃物处理的长期安全至关重要,防止受微生物影响的腐蚀.
科学领域:
- 地质微生物学的生物.
- 材料科学 材料科学 材料科学
- 核废物管理 核废物管理
背景情况:
- 高级核废物深地质储存 (DGR) 的长期安全性取决于工程和自然屏障的性能.
- 在DGRs中的微生物活动可能会影响废弃物容器的腐蚀,影响整体安全.
- 之前对地下环境中的本托尼特微生物学的研究仅限于一年的潜伏期.
研究的目的:
- 评估工程屏障组件在DGR中的微生物学和腐蚀行为.
- 在5年时间内,在类似于DGR的条件下,研究本托尼特相关微生物群落的多样性和时间变化.
- 为了评估接触自然地下水的压缩本顿石中的微生物稳定性.
主要方法:
- 利用培养依赖和分子技术 (16S rRNA基因测序) 来分析微生物群落.
- 在目标干密度 (1.25和1.50g/cm3) 上检查了压缩的怀俄明MX-80顿石.
- 在Grimsel地下研究实验室放置5年后,对钻井模块的样本进行了分析.
主要成果:
- 外面的本托尼特层中的微生物概况显示了大量的硫酸盐减少细菌 (例如,Desulfosporosinus,Desulfovibrio).
- 这些减少硫酸盐的分类物几乎无法在本托尼特核心中检测到.
- 内矿核心中的微生物群落保持稳定,并没有显示出可检测的增长,与1年的时间点和非压缩的矿对照相一致.
结论:
- 在DGR条件下,高压缩的本托尼特有效抑制微生物生长,并在5年内保持微生物稳定性.
- 这些发现加强了本托尼特的物理特性创造了一个稳定的环境,这对于防止核废物容器受到微生物影响的腐蚀至关重要.
- 这项为期五年的研究提供了重要的长期数据,支持深层地质库中工程障碍的完整性.
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