Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China; College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata", Via del Politecnico, 100133 Rome, Italy.
Sci Total Environ. 2021 Jul 20;779:146460. doi: 10.1016/j.scitotenv.2021.146460. Epub 2021 Mar 15.
In this study, the role of building pressure cycling (BPC) method in generating a subslab aerobic barrier at petroleum contaminated sites was examined numerically. The numerical model was first validated with field observations and then used to simulate BPC applications in petroleum vapor intrusion scenarios. The results indicated that, after a long-term BPC operation (60 days), a subslab aerobic barrier could be generated with an adequate air injection rate (10 L/min in this study). The effects on hydrocarbon soil gas concentration profiles are expected to last for weeks even after the BPC system is turned off. Moreover, our investigations showed that the performances of the BPC application are virtually independent of hydrocarbon's reaction rate constant. The simulated sub-foundation aerobic conditions expected during BPC were comparable to those observed in a field study where a subsurface pipe system at the same air injection rate was used to create a subslab aerobic barrier. Thus, BPC application can represent an interesting alternative approach to the subsurface delivery systems as it is expected to achieve similar performance but with lower installation costs.
在本研究中，数值研究了建筑压力循环（BPC）方法在生成石油污染场地亚表层好氧屏障中的作用。该数值模型首先通过现场观测进行了验证，然后用于模拟 BPC 在石油蒸气入侵场景中的应用。结果表明，经过长期的 BPC 运行（60 天），在适当的空气注入率（本研究中为 10 L/min）下，可以生成亚表层好氧屏障。即使关闭 BPC 系统，对烃类土壤气体浓度分布的影响预计也会持续数周。此外，我们的研究表明，BPC 应用的性能实际上与烃类的反应速率常数无关。BPC 期间模拟的次基础好氧条件与在现场研究中观察到的条件相当，在该现场研究中，使用相同空气注入率的地下管道系统来创建亚表层好氧屏障。因此，BPC 应用可以作为一种很有前途的替代方法来替代地下输送系统，因为它有望实现类似的性能，但安装成本更低。
