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Laboratory Simulation of VOC Entry into Residence Basements from Soil Gas

机译：土壤气体中VOC进入住宅地下室的室内模拟

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摘要

Pollutants in groundwater can be a source of exposure to residents of houses overlying contaminated aquifers. Volatile compounds may migrate through soil gas and enter below-grade basements under negative pressure. A three-dimensional apparatus was built to simulate intrusion of volatile organics from groundwater into residence basements. Three reference soil materials were used to fill the model, each with different air permeabilities and organic matter contents. A simulated basement was equipped with holes in the floor, which were sealed in three configurations to represent different size cracks. Experiments were run on each soil, with each hole configuration, at several levels of depressurization. Soil permeability was found to be the overriding factor controlling advective TCE intrusion into basements. Soil porosity as well as particle size and shape distribution will dictate the diffusive migration of TCE through the soil profile and toward the building superstructure. Basement crack size does not appear to be a significant variable, and degree of depressurization is only significant in terms of dilution at higher rates of flow. The experiments also served to verify previous hypotheses proposed by mathematical models and field experiments.
机译：地下水中的污染物可能是覆盖受污染的含水层之上的房屋居民的暴露源。挥发性化合物可通过土壤气体迁移并在负压下进入地下地下室。建立了三维仪器，模拟地下水中的挥发性有机物侵入住宅地下室。使用三种参考土壤材料填充模型，每种材料具有不同的透气性和有机质含量。一个模拟的地下室在地板上装有孔，这些孔以三种配置密封，以表示不同大小的裂缝。在每种土壤上，在不同的减压水平下，以每种孔的构造进行实验。发现土壤渗透性是控制平流TCE侵入地下室的首要因素。土壤的孔隙度以及颗粒的大小和形状分布将决定三氯乙烯在土壤中向建筑上部结构的扩散迁移。基底裂缝的大小似乎不是一个显着的变量，并且减压程度仅在较高流速下的稀释方面才有意义。实验还用于验证数学模型和现场实验提出的先前假设。

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  • 来源
    《Environmental Science & Technology》 |1996年第8期|p.2598-2603|共6页
  • 作者

    DAVID FISCHER; CHRISTOPHER G. UCHRIN;

  • 作者单位

    Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey 08903;

  • 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

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