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COMPATIBILITY OF BENTONITE AND DNAPLS
Citation:
McCaulou, D. R. AND S G. Huling*. COMPATIBILITY OF BENTONITE AND DNAPLS. GROUNDWATER MONITORING AND REMEDIATION. Wiley InterScience, Silver Spring, MD, 19(2):78-86, (1999).
Impact/Purpose:
Information
Description:
The compatibility of dense non-aqueous phase liquids (DNAPLs), trichloroethylene (TCE), methylene chloride (MC), and creosote with commercially available sodium bentonite pellets was evaluated using stainless steel, double-ring, falling-head permeameters. The Hydraulic conductivity of the bentonite clay was measured under different experimental conditions: (1) water soluble constituents of the DNAPLs were used to hydrate and permeate the bentonite, (2) bentonite pellets were submersed in DNAPL prior to hydration and permeation with water, and (3) DNAPLs were pooled on water-hydrated bentonite. Further, the effect of hydraulic head (2.5, 145, 710 cm) on water-hydrated bentonite permeated with TCE and the effects of TCE exposure time to mixtures of bentonite grout and sand were measured.
The incompatibility between DNAPLs and bentonite observed in this study is important due to the numerous exploratory borings in DNAPL zones, the increasing dependency on hydraulic containment as a remedial alternative, and the construction of such remedial systems are often designed to be functional for many years.