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首页> 外文期刊>Environmental Science & Technology >Bubble-Facilitated VOC Transport from LNAPL Smear Zones and Its Potential Effect on Vapor Intrusion
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Bubble-Facilitated VOC Transport from LNAPL Smear Zones and Its Potential Effect on Vapor Intrusion

机译：LNAPL涂片区中气泡促进的VOC传输及其对蒸汽入侵的潜在影响

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摘要

Most conceptual and mathematical models of soil vapor intrusion assume that the transport of volatile organic compounds (VOCs) from a source toward a building is limited by diffusion through the soil gas. Under conditions where advection occurs, transport rates are higher and can lead to higher indoor air concentrations. Advection-dominated conditions can be created by gas bubble flow in the saturated zone. A series of laboratory column experiments were conducted to measure mass flux due to bubble-facilitated VOC transport from light nonaqueous phase liquid (LNAPL) smear zones. Smear zones that contained both LNAPL residual and trapped gas, as well as those that contained only LNAPL residual, were investigated. Results showed that the VOC mass flux due to bubble-facilitated transport was orders-of-magnitude higher than under diffusion-limited conditions. Results also showed that the mass flux due to bubble-facilitated transport was intermittent, and increased with an increased supply of dissolved gases.
机译：土壤蒸汽侵入的大多数概念模型和数学模型都假定挥发性有机化合物（VOC）从源向建筑物的传输受到土壤气体扩散的限制。在发生平流的条件下，运输速率会更高，并可能导致室内空气浓度更高。对流主导的条件可以由饱和区中的气泡流动产生。进行了一系列实验室柱实验，以测量由于气泡促进了VOC从轻质非水相液体（LNAPL）涂片区传输而产生的质量通量。研究了同时包含LNAPL残留和截留气体的涂片区以及仅包含LNAPL残留的涂片区。结果表明，由于气泡促进的运输而产生的VOC质量通量比在扩散受限的条件下高了几个数量级。结果还表明，由于气泡促进的运输，质量通量是间歇性的，并且随着溶解气体供应的增加而增加。

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  • 来源
    《Environmental Science & Technology》 |2017年第5期|2795-2802|共8页
  • 作者

    Nicole C. Soucy; Kevin G. Mumford;

  • 作者单位

    Department of Civil Engineering, Queen's University, Kingston, Ontario Canada, K7L 3N6;

    Department of Civil Engineering, Queen's University, Kingston, Ontario Canada, K7L 3N6;

  • 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);
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  • 正文语种 eng
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