Retardation of volatile organic compound movement by a bentonite slurry cut-off wall ameded with ground ties
- Univ. of Wisconsin, Madison, WI (United States)
- RMT, Inc. Madison, WI (United States)
Bentonite slurry cut-off walls, have been used under site-specific conditions as an alternative to substantially reduce the spreading of groundwater contamination. Shredded tires were found to be used as a supplement to the engineered landfill clay liner system in order to retard VOC transport to a greater degree than that which occurs in the traditionally constructed engineered containment system. Laboratory-scale column permeameter tests were conducted to investigate the retardation of volatile organic compound (VOC) movement through a bentonite slurry cut-off wall amended with ground tires, which were found to sorb a significant amount of VOCs. The hydraulic conductivity was not affected by addition of ground tires but was affected by addition of VOCs at 10{approximately}15 mg/L. The hydraulic conductivity increased immediately after addition of VOCs but remained relatively constant throughout the test period. A typical slurry cut-off wall does not appear to be a good barrier for the containment of organic compounds. The organic compound breakthrough times were significantly prolonged by addition of ground tires. For example, m-xylene did not breakthrough in ground tire amended permeameters over 450 days but broke through in the silty-sand and bentonite mixed permeameter. Ground tires had a great deal of organic compound sorption capacity without deteriorating the performance of slurry cut-off walls. It appears that addition of ground tire to slurry cut-off walls significantly improve the efficiency of organic compound containment with minimal additional construction costs.
- OSTI ID:
- 416864
- Report Number(s):
- CONF-951023-; TRN: 96:005001-0021
- Resource Relation:
- Conference: 68. annual conference and exposition of the Water Environment Federation, Miami Beach, FL (United States), 21-25 Oct 1995; Other Information: PBD: 1996; Related Information: Is Part Of WEFTEC `95: 68th annual conference & exposition; PB: 498 p.
- Country of Publication:
- United States
- Language:
- English
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