Laboratory-scale analysis of aquifer remediation by in-well vapor stripping 2. Modeling results

Michael J. Pinto*, Haim Gvirtzman, Steven M. Gorelick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The removal of volatile organic compounds (VOCs) from groundwater through in-well vapor stripping has been demonstrated by Gonen and Gvirtzman (1997, J. Contam. Hydrol., 00: 000-000) at the laboratory scale. The present study compares experimental breakthrough curves with those predicted by three-dimensional numerical simulation of VOC transport, volatilization, and removal. We are able to sufficiently model the behavior of the laboratory system by assuming an isotropic, homogeneous hydraulic conductivity field and uniform linear retardation of the VOCs. The exponential reductions in concentrations of trichlorethylene, chloroform, and toluene were well represented by the simulation model. Local disparities between experimental and simulated breakthrough curves appear to result primarily from differences between the actual and estimated initial concentrations, and secondarily from differences in the actual and modeled flow field. Our analysis suggests that the in-well vapor stripping process is understood at the laboratory scale. The model developed for this work provides a sound basis for current analysis at the field scale.

Original languageAmerican English
Pages (from-to)41-58
Number of pages18
JournalJournal of Contaminant Hydrology
Volume29
Issue number1
DOIs
StatePublished - Dec 1997

Bibliographical note

Funding Information:
Funding for this study was provided by the Office of Research and Development, US Environmental Protection Agency, under Agreement R-81975 through the Western Region Hazardous Substance Research Center. The content of this study does not necessarily represent the view of the Agency. This work was also supported by the Arid Zone VOC Integrated Demonstration Program of the US Department of Energy. Computer facilities were provided by a grant from the Hewlett-Packard Company, with additional support from the National Science Foundation (Grant BCS-8957 186).

Keywords

  • Air-lift pumping
  • In-well vapor stripping
  • Recirculating wells
  • Volatile organic compounds

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