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Assessment of in situ solvent extraction interrupted pumping for remediation of subsurface coal tar contamination

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In situ solvent extraction involving continuous injection-recovery of solvent-water solutions has been proposed for removal of coal tar and other nonaqueous phase liquids from the subsurface environment. A modified in situ solvent extraction technique involving an interrupted injection-recovery procedure was examined with a view toward improved recovery efficiency. Design of an interrupted pumping process for in situ solvent extraction was examined, and an initial comparison of the interrupted pumping process with the continuous pumping process was performed by simulation. A two-dimensional solute transport model was modified to incorporate the mass transfer processes involved during the shut-in and continuous flow periods. This model was thereafter used to simulate application of the interrupted and the continuous pumping processes at a hypothetical manufactured gas plant site. The predicted coal-tar recovery rates did not differ significantly for the interrupted and continuous pumping processes, but the interrupted pumping process was consistently more efficient in terms of solvent requirements and pumping duration needed. It appears that interrupted pumping offers somewhat faster mass removal rates and somewhat reduced pumping requirements to reach a particular remediation goal.
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Keywords: COAL TAR; EXTRACTION; GROUNDWATER; PUMPING; REMEDIATION; SOLVENT

Document Type: Research Article

Publication date: 1997-05-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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