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首页> 外文期刊>Journal of Contaminant Hydrology >Natural attenuation of chlorinated ethene compounds : model development and field-scale application at the Dover site
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Natural attenuation of chlorinated ethene compounds : model development and field-scale application at the Dover site

机译：氯化乙烯化合物的自然衰减：Dover现场的模型开发和现场应用

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A multi-dimensional and multi-species reactive transport model was developed to aid in the analysis of natural attenuation design at chlorinated solvent sites. The model can simulate several simultaneously occurring attenuation processes including aerobic and anaerobic biological degra- dation processes. The developed model was applied to analyze field-scale transport and biodegra- dation processes occurring at the Area-6 site in Dover Air Force Base, Delaware. The model was calibrated to field data collected at this site. The calibrated model reproduced the general groundwater flow patterns, and also, it successfully recreated the observed distribution of tetrachloroethene (PCE), trichloroethene (TCE), dichloroethylene (DCE), vinyl chloride (VC) and chloride plumes. Field-scale decay rates of these contaminant plumes were also estimated. The decay rates are within the range of values that were previously estimated based on lab-scale microcosm and field-scale transect analyses. Model simulation results indicated that the anaerobic degradation rate of TCE, source loading rate, and groundwater transport rate are the important model parameters. Sensitivity analysis of the model indicated that the shape and extent of the predicted TCE plume is most sensitive to transmissivity values. The total mass of the predicted TCE plume is most sensitive to TCE anaerobic degradation rates. The numerical model developed in this study is a useful engineering tool for integrating field--scale natural attenuation data within a rational modeling framework. The model results can be used for quantifying the relative importance of various simultaneously occurring natural attenuation processes.
机译：建立了多维和多种反应运输模型，以帮助分析氯化溶剂位点的自然衰减设计。该模型可以模拟几个同时发生的衰减过程，包括有氧和厌氧生物降解过程。所开发的模型用于分析在特拉华州多佛空军基地的Area-6地点发生的现场规模的运输和生物降解过程。该模型已根据在此站点收集的现场数据进行了校准。校准后的模型再现了一般的地下水流模式，并且成功地再现了观察到的四氯乙烯（PCE），三氯乙烯（TCE），二氯乙烯（DCE），氯乙烯（VC）和氯气羽流的分布。还估计了这些污染物羽流的现场规模衰减率。衰减率在先前根据实验室规模的缩影和现场规模的横断面分析估计的值的范围内。模型仿真结果表明，TCE的厌氧降解率，水源负荷率和地下水运移率是重要的模型参数。对模型的敏感性分析表明，预测的TCE羽流的形状和范围对透射率值最敏感。预测的TCE羽流的总质量对TCE厌氧降解速率最敏感。在这项研究中开发的数值模型是在合理的建模框架内集成场级自然衰减数据的有用工程工具。模型结果可用于量化各种同时发生的自然衰减过程的相对重要性。

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