Reactive fronts in chemically heterogeneous porous media: Experimental and modeling investigation of pyrite oxidation

Abstract

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Mixing and Reactive Fronts in the Subsurface

“…Multidimensional laboratory flow-through experiments are instrumental for the investigation of mixing and mixing-controlled reactions in porous media. Different reactive systems have been investigated to study the interactions between mixing and reaction dynamics in porous media, including abiotic reactions between dissolved reactants (e.g., Gramling et al 2004;Katz et al 2010;Rolle et al 2009), transport of pH fronts and electrostatic interactions (e.g., Loyaux-Lawniczak et al 2012;Muniruzzaman et al 2014;Muniruzzaman and Rolle 2015), precipitation/dissolution reactions (e.g., Tartakovsky et al 2008;Poonoosami et al 2015;Haberer et al 2015;Battistel et al 2019), and microbially-mediated reactions (e.g., Thullner al. 2002;Bauer et al 2009a;Song et al 2014).…”

A Large Undisturbed Column Method to Study Flow and Transport in Macropores and Fractured Media

“…Future research will likely address reactive transport and more complex biogeochemical systems. Further development of the LUC method will include: (1) transport with sorption and biodegradation of organic contaminants (including pesticides, pharmaceuticals, and micropollutants) in macroporous geologic formations (Rosenbom et al 2014;Yu et al 2018); (2) flow and transport in macropores and fractured media under unsaturated conditions (Mortensen et al 2004); (3) transport of inorganic contaminants and colloids (McKay et al 1993;Cohen and Weisbrod 2018;James et al 2018); (4) transport of major cations and anions with electrostatic interactions within the pore water and at the solid/solution interface (Rolle et al 2013b;Muniruzzaman et al 2014); (5) flow and transport of immiscible phases such as chlorinated solvents (Pankow and Cherry 1996;O'Hara et al 2000); (6) impact of chemical and combined physico-chemical heterogeneity (Li et al 2014;Fakhreddine et al 2016;Battistel et al 2018), and (7) microbial metabolism with gas production and determination of efflux gases (Sihota et al 2018). Experimental advances in the LUC setup will also be paralleled by numerical model development.…”

Multicomponent Ionic Transport Modeling in Physically and Electrostatically Heterogeneous Porous Media With PhreeqcRM Coupling for Geochemical Reactions

“…To investigate the relevance of electrostatic effects induced by the clay surfaces during multidimensional ionic transport in a flow-through setup, we performed numerical experiments by considering a 2-D domain with dimensions of 80 cm × 12 cm (L × H). Such setup is representative of laboratory bench-scale experiments carried out in quasi 2-D flow-through chambers to study conservative and reactive transport in porous media (e.g., Tartakovsky et al, 2008;Bauer et al, 2009;Rolle et al, 2009;Haberer et al, 2012;Haberer et al, 2015;Battistel et al, 2019). The domain involves a rectangular inclusion of clay material (20 cm × 2 cm) placed at the center of the sandy matrix.…”