Yao Yijun, Wu Yun, Wang Yue, Verginelli Iason, Zeng Tian, Suuberg Eric M, Jiang Lin, Wen Yuezhong, Ma Jie
Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata" , Via del Politecnico, 1 00133 Rome, Italy.
School of Engineering, Brown University , Providence, Rhode Island 02912, United States.
Environ Sci Technol. 2015 Oct 6;49(19):11577-85. doi: 10.1021/acs.est.5b01314. Epub 2015 Sep 21.
At petroleum vapor intrusion (PVI) sites at which there is significant methane generation, upward advective soil gas transport may be observed. To evaluate the health and explosion risks that may exist under such scenarios, a one-dimensional analytical model describing these processes is introduced in this study. This new model accounts for both advective and diffusive transport in soil gas and couples this with a piecewise first-order aerobic biodegradation model, limited by oxygen availability. The predicted results from the new model are shown to be in good agreement with the simulation results obtained from a three-dimensional numerical model. These results suggest that this analytical model is suitable for describing cases involving open ground surface beyond the foundation edge, serving as the primary oxygen source. This new analytical model indicates that the major contribution of upward advection to indoor air concentration could be limited to the increase of soil gas entry rate, since the oxygen in soil might already be depleted owing to the associated high methane source vapor concentration.
在存在大量甲烷生成的石油蒸气侵入（PVI）场地，可能会观察到向上的平流土壤气体传输。为了评估在这种情况下可能存在的健康和爆炸风险，本研究引入了一个描述这些过程的一维分析模型。这个新模型考虑了土壤气体中的平流和扩散传输，并将其与一个受氧气可用性限制的分段一阶好氧生物降解模型相结合。新模型的预测结果与从三维数值模型获得的模拟结果显示出良好的一致性。这些结果表明，该分析模型适用于描述涉及基础边缘以外开放地面作为主要氧气源的情况。这个新的分析模型表明，向上平流对室内空气浓度的主要贡献可能仅限于土壤气体进入速率的增加，因为由于相关的高甲烷源蒸气浓度，土壤中的氧气可能已经耗尽。
