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Retardation of volatile organic compound movement by a soil‐bentonite slurry cutoff wall amended with ground tires
Author(s) -
Park Jae K.,
Kim Jae Y.,
Madsen Curtis D.,
Edil Tuncer B.
Publication year - 1997
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143097x125722
Subject(s) - slurry , bentonite , hydraulic conductivity , porosity , groundwater , infiltration (hvac) , geotechnical engineering , environmental science , materials science , chemistry , environmental engineering , soil water , composite material , geology , soil science
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.