Solvent diffusion and dispersion in partially saturated porous media: An experimental and numerical pore-level study

Mohammadmoradi, Peyman; Taheri, Saeed; Bryant, Steven L.; Kantzas, Apostolos

doi:10.1016/j.ces.2018.06.072

Cited by 22 publications

(5 citation statements)

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“…The diffusion and dispersion coefficients were used to adjust the simulation as closely as possible to the observed degradation results. These parameters were chosen as they have been shown to alter the transport of species in porous media [ 62 ]. According to our results, the best decolorization results are achieved for combinations of filters with immobilized enzymes and nanocomposites prepared in the presence of acetone.…”

Section: Discussionmentioning

confidence: 99%

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

et al. 2020

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Removal of azo and diazo dye content from textile industry wastewaters is crucial due to their environmental impact. Here, we report on the use of the fungal laccase from Pycnoporus sanguineus CS43 immobilized on silica nanoparticles and entrapped in textile-based filters for the degradation of Congo Red. Laccase immobilization and synthesis of the nanocomposites were carried out by two different methods, one in the presence of acetone and the second using water as solvent. This led to a change in the hydrophobicity of the obtained biofilters. Successful preparation of the nanocomposites was confirmed via FTIR spectroscopy. Changes in the secondary structure of the enzyme were inspected through the second derivative of the FTIR spectra. Six different types of filter were fabricated and tested in a continuous flow bioreactor in terms of their decolorization capabilities of Congo Red. The results indicate removal efficiencies that approached 40% for enzymes immobilized on the more hydrophobic supports. Backscattered electron (BSE) images of the different filters were obtained before and after the decolorization process. Percentage of decolorization and activity loss were determined as a function of time until a plateau in decolorization activity was reached. Experimental data was used to recreate the decolorization process in COMSOL Multiphysics® (Stockholm, Sweden). These simulations were used to determine the proper combination of parameters to maximize decolorization. Our findings suggest that the treatment of textile-based filters with immobilized laccase in conjunction with hydrophobic nanocomposites provides a suitable avenue to achieve more efficient laccase dye decolorization (39%) than that obtained with similar filters treated only with free laccase (8%). Filters treated with silica-based nanocomposites and immobilized laccases showed an increase in their decolorization capability, probably due to changes in their wetting phenomena.

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Section: Discussionmentioning

confidence: 99%

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

et al. 2020

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“…This methodology has proved useful for porous media data treatment. 40 In this way we calculated the number of pixels of the gas-liquid interfacial perimeter. Since the height of the micro device is constant (70 μm), a was calculated as the ratio of interfacial perimeter per bed area.…”

Section: Data Processingmentioning

confidence: 99%

Tailoring the multiphase flow pattern of gas and liquid through micro-packed bed of pillars

et al. 2019

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“…At present, physical simulation − and numerical simulation methods , are mainly used in the research of CO 2 miscible flooding. In physical simulations, core displacement experiments − and nuclear magnetic resonance experiments , are mainly used to study the migration law of CO 2 under macroscopic conditions.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

Cui

et al. 2023

ACS Omega

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CO 2 miscible flooding in low permeability reservoirs is conducive to significantly improving oil recovery. At present, the microscopic displacement simulation of CO 2 miscible flooding is mainly reflected in the simulation of the seepage process, but the pressure control of the seepage process is lacking, and the simulation of the characterization of CO 2 concentration diffusion is less studied. In view of the above problems, a numerical model of CO 2 miscible flooding is established, and the microscopic seepage characteristics of interphase mass transfer in CO 2 miscible flooding are analyzed by multiphysics field coupling simulations at the two-dimensional pore scale. The injection velocity, contact angle, diffusion coefficient, and initial injection concentration are selected to analyze their effects on the microscopic seepage characteristics of CO 2 miscible flooding and the concentration distribution in the process of CO 2 diffusion. The research shows that after injection into the model, CO 2 preferentially diffuses into the large pore space and forms a miscible area with crude oil through interphase mass transfer, and the miscible area expands continuously and is pushed to the outlet by the high CO 2 concentration area. The increase in injection velocity will accelerate the seepage process of CO 2 miscible displacement, which will increase the sweep area at the same time. The increase in contact angle increases the seepage resistance of CO 2 and weakens the interphase mass transfer with crude oil, resulting in a gradual decrease in the final recovery efficiency. When the diffusion coefficient increases, the CO 2 concentration in the small pores and the parts that are difficult to reach at the model edge will gradually increase. The larger the initial injection concentration is, the larger the CO 2 concentration in the large pore and miscible areas in the sweep region at the same time. This study has guiding significance for the field to further understand the microscopic seepage characteristics of CO 2 miscible flooding under the effect of interphase mass transfer.

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Solvent diffusion and dispersion in partially saturated porous media: An experimental and numerical pore-level study

Cited by 22 publications

References 71 publications

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

Tailoring the multiphase flow pattern of gas and liquid through micro-packed bed of pillars

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions

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Solvent diffusion and dispersion in partially saturated porous media: An experimental and numerical pore-level study

Cited by 22 publications

References 71 publications

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

Congo Red Decolorization Using Textile Filters and Laccase-Based Nanocomposites in Continuous Flow Bioreactors

Tailoring the multiphase flow pattern of gas and liquid through micro-packed bed of pillars

Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO2 Miscible Flooding under Multiphysics Field Coupling Conditions

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Simulation of Microscopic Seepage Characteristics of Interphase Mass Transfer in CO₂ Miscible Flooding under Multiphysics Field Coupling Conditions