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首页> 外文期刊>Journal of Contaminant Hydrology >The impact of water saturation on the infiltration behaviour of elemental mercury DNAPL in heterogeneous porous media
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The impact of water saturation on the infiltration behaviour of elemental mercury DNAPL in heterogeneous porous media

机译：水分饱和对非均质多孔介质中元素汞DNAPL渗透行为的影响

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Industrial use has led to the presence of liquid elemental mercury (Hg-0) worldwide in the subsurface as Dense NonAqueous Phase Liquid (DNAPL), resulting in long lasting sources of contamination, which cause harmful effects on human health and detrimental consequences on ecosystems. However, to date, insight into the infiltration behaviour of elemental mercury DNAPL is lacking. In this study, a two-stage flow container experiment of elemental mercury DNAPL infiltration into a variably water saturated stratified sand is described. During the first stage of the experiment, 16.3 ml of liquid Hg-0 infiltrated and distributed into an initially partially water saturated system. Afterwards, during the second stage of the experiment, consisting of the simulation of a "rain event" to assess whether the elemental mercury already infiltrated could be mobilized due to local increases in water saturation, a significant additional infiltration of 4.7 ml of liquid mercury occurred from the remaining DNAPL source. The experiment showed that, under conditions similar to those found in the field, Hg-0 DNAPL infiltration is likely to occur via fingers and is strongly controlled by porous medium structure and water saturation. Heterogeneities within the porous medium likely determined preferential pathways for liquid Hg-0 infiltration and distribution, as also suggested by dual gamma ray measurements. Overall, this study highlights that the infiltration behaviour of mercury DNAPL is strongly impacted by water saturation. In the field, this may result in a preferential infiltration of Hg-0 DNAPL in wetter areas or in its mobilization due to wetting during a rain event, as indicated by this study, or a groundwater table rise. This should be considered when assessing the likely distribution pathways of historic mercury DNAPL contamination as well as the remediation efforts.
机译：工业用途导致地下世界以致密非水相液体（DNAPL）形式存在液态元素汞（Hg-0），导致长期的污染源，对人类健康产生有害影响，并对生态系统造成不利影响。但是，迄今为止，缺乏对元素汞DNAPL渗透行为的见解。在这项研究中，描述了元素汞DNAPL渗入可变水饱和层状砂中的两阶段流动容器实验。在实验的第一阶段，有16.3 ml液态Hg-0渗透并分配到最初部分为水饱和的系统中。之后，在实验的第二阶段（包括模拟“雨水事件”），以评估是否已经渗透了元素汞，这是由于局部增加了水饱和度而引起的，另外还大量渗入了4.7 ml液态汞从剩余的DNAPL来源。实验表明，在与田间条件相似的条件下，Hg-0 DNAPL可能会通过手指渗透，并且受到多孔介质结构和水饱和度的强烈控制。双重伽马射线测量也表明，多孔介质中的异质性可能决定了液态Hg-0渗透和分布的优先途径。总的来说，这项研究突出表明水饱和度对汞DNAPL的渗透行为有很大影响。如本研究所示，在野外，这可能导致Hg-0 DNAPL在湿润地区优先渗透或由于雨水浸润（如本研究表明）而动员。在评估历史性汞DNAPL污染的可能分布途径以及补救措施时应考虑这一点。

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