Bioavailability and Molecular Structure of Organic Carbon in Bentonite

膨润土中有机碳的生物利用度和分子结构

• 批准号: 530808-2018
• 负责人: Simpson, Myrna
• 金额: $ 5.34万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=691687
• 关键词: Bioavailability; Molecular; Structure; Organic; Carbon

The Canadian Nuclear Waste Management Organization (NWMO) is tasked with developing a plan for the long-term storage of Canada's used nuclear fuel. This includes the development of an engineered barrier system for the storage of used fuel bundles that consists of used fuel containers packed in bentonite clay within a deep geologic repository (DGR) 500m below ground. Bentonite clay has a high affinity to swell and to retain any radionucleotides that may leak. Bentonite clay also contains natural organic matter which may support microbial activity in a DGR and result in corrosion of the used fuel containers. Therefore, a detailed investigation of natural organic matter chemistry and bioavailability is needed. The proposed research between the NWMO and University of Toronto researchers will investigate how organic matter in bentonite may be altered with: compaction, temperature, salinity, radiation, and how heterogeneous organic matter in bentonite may be. Highly sophisticated analytical tools will be used to assess how organic matter chemistry may be altered through these simulated DGR conditions. This information will be used to inform and further develop the long-term plan for Canada's nuclear waste storage. A long-term and sustainable plan for Canada's used nuclear fuel will ensure the safe disposal of this waste and provide a direct benefit to all Canadians.

加拿大核废物管理组织（NWMO）的任务是制定长期储存加拿大用过的核燃料的计划。 其中包括开发用于存储废燃料束的工程屏障系统，该系统由用膨润土包装的废燃料容器组成，位于地下 500m 的深层地质储存库 (DGR) 内。 膨润土具有高亲和力，可以膨胀并保留任何可能泄漏的放射性核苷酸。 膨润土还含有天然有机物质，可能会支持 DGR 中的微生物活动，并导致所用燃料容器的腐蚀。 因此，需要对天然有机物的化学和生物利用度进行详细研究。 NWMO 和多伦多大学研究人员之间拟议的研究将调查膨润土中的有机物如何因压实、温度、盐度、辐射而改变，以及膨润土中有机物的异质性。 将使用高度复杂的分析工具来评估有机物化学如何通过这些模拟的 DGR 条件而改变。 这些信息将用于告知并进一步制定加拿大核废料储存的长期计划。 针对加拿大废核燃料的长期可持续计划将确保安全处置这些废物，并为所有加拿大人提供直接利益。