将反应迁移模型作为比较受铀原位回收影响的含水层修复战略的工具箱

IF 3.5 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Nicolas Seigneur , Niya Grozeva , Bayarmaa Purevsan , Michaël Descostes
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引用次数: 0

摘要

全世界 60% 以上的铀生产都是基于原位回收开采技术。这种开采方法直接属于反应输运建模的应用范围,以优化铀生产并限制其相关的环境影响。我们提出了一种建模方法,该方法能够代表受使用硫酸进行的 ISR 试验影响的含水层的自然演变。该模型根据从 ISR 试验单元周围 12 口监测井获得的 12 年数据序列进行校准。通过这种基于过程的方法,我们模拟了在这种情况下可以考虑的几种修复策略的影响。特别是,我们模拟了泵 & 的影响;处理与反渗透的结合,以及不同操作策略下未受影响的流体在储层中的循环。我们的方法可以比较这些策略的有效性。对于这种小规模的 ISR 试验,监测自然衰减是一种有趣的方法,因为它的 pH 值恢复时间比泵& 处理(5-10 年至 pH ∼ 6)更快,其效率可以通过添加可交换阳离子来提高。如果循环未受影响的流体的时间长于 ISR 开发时间和/或延迟部署,则可缩短 pH 值恢复时间。结合对其部署的经济评估,这种建模方法可帮助采矿运营商从环境和经济角度选择和设计最佳修复战略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Reactive transport modelling as a toolbox to compare remediation strategies for aquifers impacted by uranium in situ recovery

Reactive transport modelling as a toolbox to compare remediation strategies for aquifers impacted by uranium in situ recovery

More than 60% of worldwide uranium production is based on the In Situ Recovery mining technique. This exploitation method directly falls within the scope of the applications of reactive transport modelling to optimize uranium production and limit its associated environmental impact. We propose a modelling approach which is able to represent the natural evolution of an aquifer impacted by an ISR test performed using sulfuric acid. The model is calibrated on a 12 year-long data series obtained from 12 monitoring wells surrounding an ISR pilot cell. Through this process-based approach, we simulate the impact of several remediation strategies that can be considered in these contexts. In particular, we model the impact of Pump & Treat combined with reverse osmosis, as well as the circulation of non-impacted fluids through the reservoir with different operating strategies. Our approach allows to compare the effectiveness of these strategies. For this small-scale ISR pilot, monitored natural attenuation constitutes an interesting approach due to its faster pH recovery time with respect to Pump & Treat (5–10 years to pH 6), whose efficiency can be improved by the addition of exchangeable cations. Circulation of unimpacted fluids can reduce pH recovery times if performed for periods longer than the ISR exploitation and/or deployed with a delay. Combined with an economic evaluation of their deployment, this modelling approach can help the mining operator select and design optimal remediation strategies from an environmental and economical standpoint.

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来源期刊
Journal of contaminant hydrology
Journal of contaminant hydrology 环境科学-地球科学综合
CiteScore
6.80
自引率
2.80%
发文量
129
审稿时长
68 days
期刊介绍: The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.
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