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DOI | 10.1016/j.jhydrol.2017.04.013 |
Analytical solutions for a soil vapor extraction model that incorporates gas phase dispersion and molecular diffusion | |
Huang, Junqi1; Goltz, Mark N.2 | |
发表日期 | 2017-06-01 |
ISSN | 0022-1694 |
卷号 | 549页码:452-460 |
英文摘要 | To greatly simplify their solution, the equations describing radial advective/dispersive transport to an extraction well in a porous medium typically neglect molecular diffusion. While this simplification is appropriate to simulate transport in the saturated zone, it can result in significant errors when modeling gas phase transport in the vadose zone, as might be applied when simulating a soil vapor extraction (SVE) system to remediate vadose zone contamination. A new analytical solution for the equations describing radial gas phase transport of a sorbing contaminant to an extraction well is presented. The equations model advection, dispersion (including both mechanical dispersion and molecular diffusion), and rate limited mass transfer of dissolved, separate phase, and sorbed contaminants into the gas phase. The model equations are analytically solved by using the Laplace transform with respect to time. The solutions are represented by confluent hypergeometric functions in the Laplace domain. The Laplace domain solutions are then evaluated using a numerical Laplace inversion algorithm. The solutions can be used to simulate the spatial distribution and the temporal evolution of contaminant concentrations during operation of a soil vapor extraction well. Results of model simulations show that the effect of gas phase molecular diffusion upon concentrations at the extraction well is relatively small, although the effect upon the distribution of concentrations in space is significant. This study provides a tool that can be useful in designing SVE remediation strategies, as well as verifying numerical models used to simulate SVE system performance. Published by Elsevier B.V. |
英文关键词 | Analytical solution;Soil vapor extraction;Integral transforms;Confluent hypergeometric functions |
语种 | 英语 |
WOS记录号 | WOS:000403855500035 |
来源期刊 | JOURNAL OF HYDROLOGY
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来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/58083 |
作者单位 | 1.US EPA, Ground Water & Ecosyst Restorat Div, Natl Risk Management Res Lab, Ada, OK 74820 USA; 2.US Air Force, Dept Syst Engn & Management, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA |
推荐引用方式 GB/T 7714 | Huang, Junqi,Goltz, Mark N.. Analytical solutions for a soil vapor extraction model that incorporates gas phase dispersion and molecular diffusion[J]. 美国环保署,2017,549:452-460. |
APA | Huang, Junqi,&Goltz, Mark N..(2017).Analytical solutions for a soil vapor extraction model that incorporates gas phase dispersion and molecular diffusion.JOURNAL OF HYDROLOGY,549,452-460. |
MLA | Huang, Junqi,et al."Analytical solutions for a soil vapor extraction model that incorporates gas phase dispersion and molecular diffusion".JOURNAL OF HYDROLOGY 549(2017):452-460. |
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