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Surfactant Foam Selection for Enhanced Light Non-Aqueous Phase Liquids (LNAPL) Recovery in Contaminated Aquifers.

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Longpré-Girard, Mélanie; Martel, Richard; Robert, Thomas; Lefebvre, René; Lauzon, Jean-Marc; Thomson, Neil (9999). Surfactant Foam Selection for Enhanced Light Non-Aqueous Phase Liquids (LNAPL) Recovery in Contaminated Aquifers. Transport in Porous Media . DOI: 10.1007/s11242-019-01292-0. (Sous Presse)

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Résumé

Foam is promising for the remediation of non-aqueous phase liquids (NAPL) source zones; however, the production of foam and its behavior in porous media are poorly understood. A methodology for the selection of surfactants suitable for foam production applied to NAPL remediation was developed. Two criteria were initially used for surfactant selection: foamability as evaluated by the Ross–Miles test and interfacial tension reduction measured with the pendant drop method. Three promising surfactants were identified and used in sand column tests: Genapol LRO because it produced the highest foam height in the Ross–Miles test, Ammonyx Lo which exhibited the lowest interfacial tension with p-xylene and had the second highest foam height, and Tomadol 900 because it showed intermediate results in both tests. Viscosity was found to be proportional to foamability. Genapol LRO produced a foam so viscous that it destabilized by the end of the experiment. Ammonyx Lo produced a less viscous foam but with a stable front. Tomadol 900 produced an unstable foam with poor viscosity. Results from column tests gave indications of optimal conditions needed to produce a stable and viscous foam front.

Type de document: Article
Mots-clés libres: foam; surfactant; NAPL recovery; in situ remediation; Ross–Miles test
Centre: Centre Eau Terre Environnement
Date de dépôt: 29 nov. 2019 14:26
Dernière modification: 29 nov. 2019 14:26
URI: http://espace.inrs.ca/id/eprint/8521

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