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Retardation of volatile organic compound movement by a soil-bentonite slurry cutoff wall amended with ground tires

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Abstract:

Laboratory-scale column tests were conducted to investigate the retardation of volatile organic compound (VOC) movement through a soil–bentonite (SB) slurry cutoff wall material amended with ground tires, which was found to sorb a significant amount of VOCs. The hydraulic conductivity of the SB slurry cutoff wall backfill material was not affected by the addition of ground tires. The hydraulic conductivity of the ground-tire-amended SB backfill specimen increased 1.1 to 1.2 times after the spiking with VOCs; however, that of the conventional SB backfill specimen increased 1.7 to 1.8 times. The effective porosity of the backfill specimens tested was in the range of 70 to 100%. The partition coefficient of trichloroethylene (TCE) increased from 0.96 to 13.41 L/kg when 15% by weight of ground tires was added. As a result, the time for TCE to break through to 10% of the influent concentration became approximately 10 times longer by the addition of 15% ground tires by weight. Ground tire addition to the SB slurry cutoff wall appears to provide a significant amount of VOC retardation capacity without deteriorating the performance of the slurry cutoff wall.

Keywords: BENTONITE; MASS TRANSFER; PARTITION COEFFICIENT; SLURRY CUTOFF WALL; TIRES; TRICHLOROETHYLENE; VOLATILE ORGANIC COMPOUNDS

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143097X125722

Publication date: July 1, 1997

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  • 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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