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首页> 外文期刊>Journal of the American Water Resources Association >MODELING LONG-TERM TRENDS OF CHLORINATED ETHENE CONTAMINATION AT A PUBLIC SUPPLY WELL
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MODELING LONG-TERM TRENDS OF CHLORINATED ETHENE CONTAMINATION AT A PUBLIC SUPPLY WELL

机译：模拟公共供应井中氯化乙烯污染的长期趋势

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摘要

A mass-balance solute-transport modeling approach was used to investigate the effects of dense nonaqueous phase liquid (DNAPL) volume, composition, and generation of daughter products on simulated and measured long-term trends of chlorinated ethene (CE) concentrations at a public supply well. The model was built by telescoping a calibrated regional three-dimensional MODFLOW model to the capture zone of a public supply well that has a history of CE contamination. The local model was then used to simulate the interactions between naturally occurring organic carbon that acts as an electron donor, and dissolved oxygen (DO), CEs, ferric iron, and sulfate that act as electron acceptors using the Sequential Electron Acceptor Model in three dimensions (SEAM3D) code. The modeling results indicate that asymmetry between rapidly rising and more gradual falling concentration trends over time suggests a DNAPL rather than a dissolved source of CEs. Peak concentrations of CEs are proportional to the volume and composition of the DNAPL source. The persistence of contamination, which can vary from a few years to centuries, is proportional to DNAPL volume, but is unaffected by DNAPL composition. These results show that monitoring CE concentrations in raw water produced by impacted public supply wells over time can provide useful information concerning the nature of contaminant sources and the likely future persistence of contamination.
机译：使用质量平衡溶质传输建模方法研究了稠密非水相液体（DNAPL）的体积，组成和子产物的生成对公众模拟和测量的氯化乙烯（CE）浓度长期趋势的影响供应充足。该模型是通过将已校准的区域三维MODFLOW模型伸缩到具有CE污染历史的公共供应井的捕获区而建立的。然后使用三维顺序电子受体模型，使用局部模型来模拟充当电子供体的天然有机碳与充当电子受体的溶解氧（DO），CE，三价铁和硫酸盐之间的相互作用（SEAM3D）代码。建模结果表明，随着时间的流逝，浓度迅速上升和逐渐下降之间的不对称性表明了DNAPL而不是溶解的CE来源。 CE的峰值浓度与DNAPL来源的体积和组成成正比。污染的持续时间（从几年到几个世纪不等）与DNAPL的体积成正比，但不受DNAPL组成的影响。这些结果表明，随着时间的推移，对受影响的公共供应井所产生的原水中CE的浓度进行监测，可以提供有关污染物来源的性质以及未来污染物可能持续存在的有用信息。

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