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Gravity-driven remediation of DNAPL polluted aquifers using densified biopolymer brine solution

Article dans une revue avec comité de lecture
Author
ccALAMOOTI, Amir
243969 Agence de l'Environnement et de la Maîtrise de l'Énergie [ADEME]
1002421 Institut de Mécanique et d'Ingénierie [I2M]
18404 Bureau de Recherches Géologiques et Minières [BRGM]
ccCOLOMBANO, Stéfan
18404 Bureau de Recherches Géologiques et Minières [BRGM]
1002960 Laboratoire Géomatériaux et Environnement [LGE]
ccDAVARZANI, Dorian
18404 Bureau de Recherches Géologiques et Minières [BRGM]
ccLION, Fabien
18404 Bureau de Recherches Géologiques et Minières [BRGM]
169367 UNIROUEN - UFR Santé [UNIROUEN UFR Santé]
555883 Service de Soins Intensifs [CHU Rouen]
ccAHMADI-SENICHAULT, Azita
1002421 Institut de Mécanique et d'Ingénierie [I2M]

URI
http://hdl.handle.net/10985/24884
DOI
10.1016/j.advwatres.2024.104643
Date
2024-03
Journal
Advances in Water Resources

Abstract

Polymer solutions aid DNAPL (Dense Non Aqueous Phase Liquid)-contaminated soil remediation but are impacted by gravity and viscous forces. This study assesses the interplay between buoyancy and viscous forces in influencing the distribution of DNAPL and the invading phase, by introducing a densified brine (NaI) biopolymer (xanthan) solution as remediation fluid. A matrix of experiments was conducted, encompassing rheological measurements, multiphase flow tests in 1D-columns and 2D-tanks. Numerical modeling was used to assess polymer and DNAPL propagation under different conditions. NaI addition maintains xanthan's shear-thinning yet lowers mid-range shear viscosity 2.6 times. Confined column tests show similar 89 % performance for viscous polymer solutions regardless of density. Unconfined tests mimicking real sites reveal non-densified viscous polymer solution yield mere 0.09 recovery due to density-driven flow. Densified polymer attains radial invasion, boosting recovery to 0.46 with 1.21 aspect ratio. Numerical simulations aligned with experiments, suggesting a near-zero gravity number is necessary to prevent density-driven flow problems. The multiphase flow experiments in confined multilayer system are performed and using the numerical modeling the effects of the permeability contrast and dimensions of the layers on the shape of front are analyzed.

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