Laboratory investigation of dense non-aqueous phase liquid migration and remediation in mixed wettability soils monitored by pressure transducers
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A series of dense non-aqueous phase liquid (DNAPL) spills was conducted in a two-dimensional sand box filled with a variety of media. At the conclusion of the spill, the soil underwent remediation via a waterflood followed by a surfactant flush. Pressure data recorded during the experiments confirmed that DNAPL will be drawn into NAPL-wet lenses and result in negative capillary pressures. The waterflood had little impact on the NAPL distribution. The surfactant flush did reduce the DNAPL-water interfacial tension allowing some of the DNAPL to drain from the NAPL-wet lenses; however a NAPL-saturated layer remained at the bottom of the lenses. It was hypothesized that thickness of the NAPL-saturated layer that remained reflects the capillary pressure difference between the reduced NAPL-entry pressure of the hydrophilic soil below the lens and the reduced water-entry pressure that would allow the DNAPL to drain and water to enter the hydrophobic sand.
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Copyright © 2016 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2016
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