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首页> 外文期刊>Environmental Science & Technology >Modeling the impact of a benzene source zone on the transport behavior of PAHs in groundwater
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Modeling the impact of a benzene source zone on the transport behavior of PAHs in groundwater

机译：模拟苯源区对地下水中多环芳烃的迁移行为的影响

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摘要

Aquifers at industrial sites are commonly characterized by a multitude of contaminant source zones. Conceivably, dissolved contaminants originating from an up-gradient residual nonaqueous phase liquid (NAPL) source zone may be transported along the groundwater flow path into another residual NAPL source zone down-gradient. However, if and how contaminants from different zones may affect one another with regard to dissolution and transport has thus far been unknown. To identify and understand such potential interactions, the numerical model BIONAPL3D was applied to simulate the behavior of six dissolved polycyclic aromatic hydrocarbons (PAHs), stemming simultaneously from an up-gradient NAPL source zone, when they encounter a down-gradient NAPL source zone. The down-gradient NAPL source zone was assumed to be a residual benzene phase with a saturation of 10%. When the dissolved PAHs entered the benzene source zone, the aqueous PAH concentrations declined significantly due to their partitioning into the residual benzene phase. As benzene rapidly dissolved into the aqueous phase, the PAHs were resolubilized with negligible impact due to benzene co-solvency. The degree of resolubilization was much smaller than the initial loss due to partitioning into the benzene phase. Thus, the PAHs formed a new residual NAPL phase that, over time, replaced the original benzene source zone. The new NAPL phase continued to grow even after all of the benzene was dissolved. Our modeling approach is the first theoretical demonstration of a significant interaction of contaminants emanating from multiple source zones. It should be regarded as a starting point to consider source zone interactions at polluted field sites.
机译：工业现场的含水层通常以许多污染源区为特征。可以想象，源自上升梯度的残留非水相液体（NAPL）源区的溶解污染物可以沿着地下水流路输送到另一个下降的残留NAPL源区。然而，至今尚不清楚来自不同区域的污染物是否以及如何相互影响溶解和运输。为了识别和理解这种潜在的相互作用，数值模型BIONAPL3D用于模拟六个溶解的多环芳烃（PAH）的行为，当它们遇到一个向下梯度的NAPL源区时，它们同时来自一个向上梯度的NAPL源区。降梯度的NAPL源区被假定为残留苯相，饱和度为10％。当溶解的PAH进入苯源区时，PAH水溶液的浓度由于其分配到残留的苯相中而显着下降。随着苯迅速溶解到水相中，由于苯的共溶解性，PAHs的溶解度可忽略不计。由于分配到苯相，再溶解度比最初的损失小得多。因此，PAHs形成了新的残留NAPL相，随着时间的流逝，它会取代原始的苯源区。即使所有苯溶解后，新的NAPL相仍继续生长。我们的建模方法是对来自多个污染源区域的污染物之间显着相互作用的第一个理论证明。应该将其视为考虑污染场地现场源区相互作用的起点。

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  • 来源
    《Environmental Science & Technology》 |2006年第11期|p. 3565-3571|共7页
  • 作者

    Russold S; Schirmer M; Piepenbrink M; Schirmer K;

  • 作者单位

    UFZ, Dept Cell Toxicol, Ctr Environm Res Leipzig Halle, Helmoltz Assoc, D-04318 Leipzig, Germany;

    UFZ, Dept Hydrogeol, Ctr Environm Res Leipzig Halle, Helmoltz Assoc, D-04318 Leipzig, Germany;

    Tech Univ Darmstadt, Inst Appl Geosci, D-64287 Darmstadt, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

    MASS-TRANSFER; POROUS-MEDIA; DISSOLUTION; LIQUIDS; SOIL;

    机译：传质;多孔介质;溶解度;液体;土壤;

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