Modeling electrokinetic transport and biogeochemical reactions in porous media: A multidimensional Nernst–Planck–Poisson approach with PHREEQC coupling

Sprocati, Riccardo; Masi, Matteo; Muniruzzaman, Muhammad; Rolle, Massimo

doi:10.1016/j.advwatres.2019.03.011

Cited by 68 publications

(44 citation statements)

References 76 publications

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“…No gangue aluminosilicates were considered in the reaction network as in our laboratory experiments, and no evidence for aluminosilicate dissolution was found. The model framework that we used for the simulations considers the integrated description of ionic transport via electromigration, Coulombic interactions between transported species, and kinetically controlled geochemical reactions ( 34 ).…”

Section: Resultsmentioning

confidence: 99%

Toward a more sustainable mining future with electrokinetic in situ leaching

et al. 2021

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Metals are currently almost exclusively extracted from their ore via physical excavation. This energy-intensive process dictates that metal mining remains among the foremost CO2 emitters and mine waste is the single largest waste form by mass. We propose a new approach, electrokinetic in situ leaching (EK-ISL), and demonstrate its applicability for a Cu-bearing sulfidic porphyry ore. In laboratory-scale experiments, Cu recovery was rapid (up to 57 weight % after 94 days) despite low ore hydraulic conductivity (permeability = 6.1 mD; porosity = 10.6%). Multiphysics numerical model simulations confirm the feasibility of EK-ISL at the field scale. This new approach to mining is therefore poised to spearhead a new paradigm of metal recovery from currently inaccessible ore bodies with a markedly reduced environmental footprint.

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Section: Resultsmentioning

confidence: 99%

Toward a more sustainable mining future with electrokinetic in situ leaching

et al. 2021

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“…48). A mechanistic understanding of the multidimensional transport of organic and inorganic contaminants coupled with the reactions in porous media has drawn attention recently [165–167]. In this regard, Sprocati et al.…”

Section: Eof Through Nanoscale Pores and Channelsmentioning

confidence: 99%

“…In this regard, Sprocati et al. [166] modeled the electrokinetic transport with biogeochemical reactions in porous media for continuum scale by combining COMSOL Multiphysics and PhreeqcRM. The former was used for solving the Poisson–Nernst–Planck equations and the latter [168] for solving the geochemical reactions.…”

Section: Eof Through Nanoscale Pores and Channelsmentioning

confidence: 99%

Electroosmotic flow: From microfluidics to nanofluidics

et al. 2021

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Electroosmotic flow (EOF), a consequence of an imposed electric field onto an electrolyte solution in the tangential direction of a charged surface, has emerged as an important phenomenon in electrokinetic transport at the micro/nanoscale. Because of their ability to efficiently pump liquids in miniaturized systems without incorporating any mechanical parts, electroosmotic methods for fluid pumping have been adopted in versatile applications—from biotechnology to environmental science. To understand the electrokinetic pumping mechanism, it is crucial to identify the role of an ionically polarized layer, the so‐called electrical double layer (EDL), which forms in the vicinity of a charged solid–liquid interface, as well as the characteristic length scale of the conducting media. Therefore, in this tutorial review, we summarize the development of electrical double layer models from a historical point of view to elucidate the interplay and configuration of water molecules and ions in the vicinity of a solid–liquid interface. Moreover, we discuss the physicochemical phenomena owing to the interaction of electrical double layer when the characteristic length of the conducting media is decreased from the microscale to the nanoscale. Finally, we highlight the pioneering studies and the most recent works on electro osmotic flow devoted to both theoretical and experimental aspects.

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“…RTMs have been primarily applied in groundwater and deep subsurface systems at spatial scales from pores (Kang et al 2006;Li et al 2008;Fang et al 2011;Molins et al 2014;Scheibe et al 2015;Sprocati et al 2019) to field scales at tens to hundreds of meters (Li et al 2011;Beaulieu et al 2011Beaulieu et al , 2015Navarre-Sitchler et al 2013). Regional scale RTMs have recently been linked to global vegetation models to understand the role of climate change in controlling weathering over periods of 10 2 to 10 3 years (Goddéris et al 2006(Goddéris et al , 2013Roelandt et al 2010).…”

Section: Watershed Reactive Transport Modelling a Brief History Of Rementioning

confidence: 99%

“…RTMs have since been utilized as an integration and interpretation tool across diverse environments involving both porous and fractured media (as reviewed inMacQuarrie and Mayer 2005;Steefel et al 2005;Sprocati et al 2019). They have simulated a plethora of…”

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confidence: 99%

Watershed Reactive Transport

2019

Reviews in Mineralogy and Geochemistry

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A watershed (also drainage basin, river basin, or catchment) is defined as "… the area that topographically appears to contribute all the water that passes through a specified cross section of a stream (the outlet)" (Dingman 2015). In this chapter, I choose to use the term "watershed" as it is a broadly used one; it should be understood more as small watersheds or catchments. Watersheds are the fundamental units that support river networks, the blood vessels at Earth's surface ultimately draining into the ocean. Watersheds are complex hydro-biogeochemical reactors. They receive water, mass, and energy, transport them to distinct compartments, and transform them into various forms (Fig.1). Hydrological processes partition precipitation to the atmosphere, to the ground surface, and to the subsurface, eventually entering streams. Similarly, plants translate sunlight, water, CO 2 , and nutrients into organic matters (leaves, stems, roots) that fall and deposit in soil. As water routes through soils, it interacts with roots, microbes, and reactive gases (i.e., CO 2 and O 2), releases solutes, and ultimately transporting them out of watersheds. The water flow (discharge) and solute concentrations measured at stream outlets therefore reflect convoluted signature of ecohydrological and biogeochemical coupling. The process interactions and feedbacks are dictated not only by hydroclimatic forcing but also the architecture of watersheds, in particular the above-ground characteristics such as land cover and surface topography, as well as the below-ground structure including soil depth, soil type, geology, and root architecture. The external forcing and internal idiosyncrasies dictate the magnitude, timing, and spatial distribution of water flow and chemistry (Chorover et al. 2011; Brooks et al. 2015), giving rise to non-linear emergent behaviors that are unique of watershed reactive transport processes. Understanding feedbacks and non-linearity requires process-based models that integrate multiple interacting processes. Such integration however does not come easily with traditional boundaries of hydrology versus biogeochemistry relevant disciplines. As will be discussed later in this chapter, relevant model development has been advancing along two separate lines: hydrology models that solve for water storage and fluxes at the watershed scale and beyond (Fatichi et al. 2016), and reactive transport models (RTMs) that center on aqueous and solid concentration changes arising from transport and multi-component biogeochemical reactions typically in "closed" groundwater systems without much interactions with "open" watersheds directly receiving precipitation and sun light (Steefel et al. 2015; Li et al. 2017b). This comes along with a history of hydrologists often trained as physicists studying fluid mechanics, and biogeochemists typically grow up as geologists, chemists, or environmental engineers. There are however considerable needs to reach beyond disciplinary boundaries and integrate the two lines to develop watershed reacti...

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Modeling electrokinetic transport and biogeochemical reactions in porous media: A multidimensional Nernst–Planck–Poisson approach with PHREEQC coupling

Cited by 68 publications

References 76 publications

Toward a more sustainable mining future with electrokinetic in situ leaching

Toward a more sustainable mining future with electrokinetic in situ leaching

Electroosmotic flow: From microfluidics to nanofluidics

Watershed Reactive Transport

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