Contaminant transport in soil: A comparison of the Theory of Porous Media approach with the microfluidic visualisation

Seyedpour, Seyed Morteza; Henning, Carla; Sanati‐Nezhad, Amir; Ricken, Tim

doi:10.1016/j.scitotenv.2019.05.095

Cited by 20 publications

(13 citation statements)

References 28 publications

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“…In a silica-based micromodel to visualize the transport of oocysts, the silica surfaces were selectively deposited with Fe 2 O 3 patches to simulate the charge heterogeneity of soil particles (Figure A) . Other researchers have developed different methods to coat the microfluidic channels with soil clays − and natural organic matter . The effects of soil matrix, particle properties, hydrodynamic conditions, and biotic activities on colloidal transport can be directly observed.…”

Section: Microfluidics For Investigating Soil Interfacial Processesmentioning

confidence: 99%

“…Soil micromodels have also been used to directly visualize the flow and transport of fluids and gases, including both single phase flow and multiphase flow. Single phase flow mainly addresses water flows in soil pores as well as the transport of soil nutrients and contaminants . Multiphase flow includes water (brine)oil (or nonaqueous phase liquids, NAPL) system, watergas system, and watergasoil system. , The impact of flow rates, pore geometries, wettability, and their interplay on the immiscible fluid displacement during imbibition or drainage can be precisely determined.…”

Section: Microfluidics For Investigating Soil Interfacial Processesmentioning

confidence: 99%

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Microfluidics as an Emerging Platform for Exploring Soil Environmental Processes: A Critical Review

Zhu

Wang

Yan

et al. 2022

Environ. Sci. Technol.

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Investigating environmental processes, especially those occurring in soils, calls for innovative and multidisciplinary technologies that can provide insights at the microscale. The heterogeneity, opacity, and dynamics make the soil a “black box” where interactions and processes are elusive. Recently, microfluidics has emerged as a powerful research platform and experimental tool which can create artificial soil micromodels, enabling exploring soil processes on a chip. Micro/nanofabricated microfluidic devices can mimic some of the key features of soil with highly controlled physical and chemical microenvironments at the scale of pores, aggregates, and microbes. The combination of various techniques makes microfluidics an integrated approach for observation, reaction, analysis, and characterization. In this review, we systematically summarize the emerging applications of microfluidic soil platforms, from investigating soil interfacial processes and soil microbial processes to soil analysis and high-throughput screening. We highlight how innovative microfluidic devices are used to provide new insights into soil processes, mechanisms, and effects at the microscale, which contribute to an integrated interrogation of the soil systems across different scales. Critical discussions of the practical limitations of microfluidic soil platforms and perspectives of future research directions are summarized. We envisage that microfluidics will represent the technological advances toward microscopic, controllable, and in situ soil research.

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Section: Microfluidics For Investigating Soil Interfacial Processesmentioning

confidence: 99%

Section: Microfluidics For Investigating Soil Interfacial Processesmentioning

confidence: 99%

Microfluidics as an Emerging Platform for Exploring Soil Environmental Processes: A Critical Review

Zhu

Wang

Yan

et al. 2022

Environ. Sci. Technol.

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“…To date, however, spatially resolved studies have mostly focused on embedded samples and did not observe temporal evolution. Experiments in microfluidic flow channels (microchannels), coupled with optical microscopy and synchrotron X-ray spectroscopy, may allow us to bridge the gap between spatially and temporally resolved process-oriented geochemical studies in complex porous media. − Although microchannels may not replicate the entire complexity of natural or engineered systems, their specifically reduced complexity allows us to disentangle the coupling between processes such as fluid–fluid and fluid–solid reactions under single and multiphase flow conditions. ,,, Microchannels are therefore well-suited for pore-scale investigations into phase formation and transformation in porous media.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Mineral Phase Evolution and Arsenic Retention in Microfluidic Models of Zerovalent Iron-Based Water Treatment

Wielinski

Jiménez‐Martínez

Göttlicher

et al. 2022

Environ. Sci. Technol.

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Arsenic (As) is a toxic element, and elevated levels of geogenic As in drinking water pose a threat to the health of several hundred million people worldwide. In this study, we used microfluidics in combination with optical microscopy and X-ray spectroscopy to investigate zerovalent iron (ZVI) corrosion, secondary iron (Fe) phase formation, and As retention processes at the pore scale in ZVI-based water treatment filters. Two 250 μm thick microchannels filled with single ZVI and quartz grain layers were operated intermittently (12 h flow/12 h no-flow) with synthetic groundwater (pH 7.5; 570 μg/L As(III)) over 13 and 49 days. Initially, lepidocrocite (Lp) and carbonate green rust (GRC) were the dominant secondary Fe-phases and underwent cyclic transformation. During no-flow, lepidocrocite partially transformed into GRC and small fractions of magnetite, kinetically limited by Fe(II) diffusion or by decreasing corrosion rates. When flow resumed, GRC rapidly and nearly completely transformed back into lepidocrocite. Longer filter operation combined with a prolonged no-flow period accelerated magnetite formation. Phosphate adsorption onto Fe-phases allowed for downstream calcium carbonate precipitation and, consequently, accelerated anoxic ZVI corrosion. Arsenic was retained on Fe-coated quartz grains and in zones of cyclic Lp-GRC transformation. Our results suggest that intermittent filter operation leads to denser secondary Fe-solids and thereby ensures prolonged filter performance.

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“…To solve these equations, there are two different approaches, namely the analytical and the numerical approaches. Different numerical approaches, such as finite difference methods (FDM) [8], finite element methods (FEM) [9][10][11][12][13][14], finite volume methods (FVM) [15] and Meshfree methods including radial point collocation method (RPCM) [16,17], and radial base functions (RBFS) [18,19] can be utilised to solve the governing equation of the flow and solute transport in groundwater. The selection of the best method among these depends on site-specific needs, availability of input data, expectation and use of the model results, and the analytical solution can be used as a benchmark to show the accuracy of the numerical approach used, considering different conditions such as the aquifer's heterogeneity [11].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Groundwater Remediation Process Using a Coupled Genetic Algorithm-Finite Difference Method

Seyedpour

Valizadeh

Kirmizakis

et al. 2021

Water

Self Cite

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In situ chemical oxidation using permanganate as an oxidant is a remediation technique often used to treat contaminated groundwater. In this paper, groundwater flow with a full hydraulic conductivity tensor and remediation process through in situ chemical oxidation are simulated. The numerical approach was verified with a physical sandbox experiment and analytical solution for 2D advection-diffusion with a first-order decay rate constant. The numerical results were in good agreement with the results of physical sandbox model and the analytical solution. The developed model was applied to two different studies, using multi-objective genetic algorithm to optimise remediation design. In order to reach the optimised design, three objectives considering three constraints were defined. The time to reach the desired concentration and remediation cost regarding the number of required oxidant sources in the optimised design was less than any arbitrary design.

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Contaminant transport in soil: A comparison of the Theory of Porous Media approach with the microfluidic visualisation

Cited by 20 publications

References 28 publications

Microfluidics as an Emerging Platform for Exploring Soil Environmental Processes: A Critical Review

Microfluidics as an Emerging Platform for Exploring Soil Environmental Processes: A Critical Review

Spatiotemporal Mineral Phase Evolution and Arsenic Retention in Microfluidic Models of Zerovalent Iron-Based Water Treatment

Optimization of the Groundwater Remediation Process Using a Coupled Genetic Algorithm-Finite Difference Method

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