Laboratory investigation of dense non-aqueous phase liquid migration and remediation in mixed wettability soils monitored by pressure transducers

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Creator: 

Roberge-Butcher, Michelle Denise

Date: 

2016

Abstract: 

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.

Subject: 

Engineering - Environmental

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Applied Science: 
M.App.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Engineering, Environmental

Parent Collection: 

Theses and Dissertations

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