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|Title:||Dispersion-by-chemical-reaction technology to stabilize asphalt tar, Eareckson Air Force Station, Shemya, Alaska|
|Authors:||United States. Air Force.|
Brar, Gurdarshan S.
Marion, Giles M. (Giles Michael)
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 95-11.|
Abstract: Many military installations have soil contamination, ranging from heavy metals to petroleum products. This report evaluates the Dispersion-by-Chemical-Reaction (DCR) technology to remediate soil contaminated by asphalt tar at Eareckson Air Force Station on Shemya Island in Alaska. The DCR technology uses patented hydrophobized CaO (lime) as the primary reagent for stabilizing heavy metals and organics in a relatively insoluble CaCO3 matrix. Field work, conducted at Shemya in January 1994, showed OCR technology to significantly affect soil physical and chemical properties: moisture significantly decreased and temperature significantly increased during the mixing step (up to 95°C). The resultant product had a relatively low specific gravity (2.08 g cm⁻³) and a coarse texture (37% gravel, 56% sand, and 6% fines). Because ofthe coarse texture, the treated soils had high hydraulic conductivities (> 2.7 x 10⁻⁴cm s⁻¹). Reducing these for some applications will necessitate mixing with finer textured silts or clays. There were a few significant differences in chemical concentrations between DCR treated and untreated soil, with the DCR-treated material generally having higher concentrations. This counterintuitive outcome is probably attributable to a poor mixing of the lime reagent and asphalt tar and the greater surface area of the treated end product. However, in all cases, contaminant levels were well below drinking water standards. In an independent laboratory-scale test on fuel-contaminated soils from Shemya, the DCR process successfully lowered organic chemical concentrations.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Special Report|
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|SR-95-11.pdf||5.55 MB||Adobe PDF|