scholarly journals Solute mixing regulates heterogeneity of mineral precipitation in porous media

2017 ◽  
Vol 44 (13) ◽  
pp. 6658-6666 ◽  
Author(s):  
Mehmet B. Cil ◽  
Minwei Xie ◽  
Aaron I. Packman ◽  
Giuseppe Buscarnera
Keyword(s):  
Porous Media ◽  
Mineral Precipitation ◽  
Solute Mixing

A lattice-Boltzmann study of permeability-porosity relationships and mineral precipitation patterns in fractured porous media

2020 ◽  
Vol 24 (5) ◽  
pp. 1865-1882 ◽  
Author(s):  
Mehrdad Ahkami ◽  
Andrea Parmigiani ◽  
Paolo Roberto Di Palma ◽  
Martin O. Saar ◽  
Xiang-Zhao Kong
Keyword(s):  
Porous Media ◽  
Lattice Boltzmann ◽  
Fractured Porous Media ◽  
Mineral Precipitation ◽  
Precipitation Patterns

Spectral Induced Polarization Signatures of Mineral Precipitation and Hydroxide Adsorptionin in Porous Media

2012 ◽  
Author(s):  
Chi Zhang ◽  
Lee Slater ◽  
George Redden ◽  
Yoshiko Fujita ◽  
Timothy Johnson ◽  
...  
Keyword(s):  
Porous Media ◽  
Induced Polarization ◽  
Mineral Precipitation ◽  
Spectral Induced Polarization

scholarly journals A “lab-on-a-chip” experiment for assessing mineral precipitation processes in fractured porous media

2020 ◽  
Author(s):  
Jenna Poonoosamy ◽  
Sophie Roman ◽  
Cyprien Soulaine ◽  
Hang Deng ◽  
Sergi Molins ◽  
...  
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Reactive Transport ◽  
Surface Passivation ◽  
Pore Scale ◽  
Mineral Precipitation ◽  
Transport Models ◽  
Mineral Transformation ◽  
Fractured Porous Medium ◽  
Fractured Medium

<p>The understanding of dissolution and precipitation of minerals and its impact on the transport of fluids in fractured media is essential for various subsurface applications including shale gas production using hydraulic fracturing (“fracking”), CO<sub>2</sub> sequestration, or geothermal energy extraction. The implementation of such coupled processes into numerical reactive transport codes requires a mechanistic process understanding and model validation with quantitative experiments. In this context, we developed a microfluidic “lab-on-chip” of a reactive fractured porous medium of 800 µm × 900 µm size with 10 µm depth. The fractured medium consisted of compacted celestine grains (grain size 4 – 9 µm). A BaCl<sub>2</sub> solution was injected into the microreactor at a flow rate of 500 nl min<sup>-1</sup>, leading to the dissolution of celestine and an epitaxial growth of barite on its surface (Poonoosamy et al., 2016). Our investigations including confocal Raman spectroscopic techniques allowed for monitoring the temporal mineral transformation at the pore scale in 2D and 3D geometries. The fractured porous medium causes a heterogeneous flow field in the microreactor that leads to spatially different mineral transformation rates. In these experiments, the dynamic evolution of surface passivation processes depends on two intertwined processes: i) the dissolution of the primary mineral that is needed for the subsequent precipitation, and ii) the suppression of the dissolution reaction as a result of secondary mineral precipitation. However, the description of evolving reactive surface areas to account for mineral passivation mechanisms in reactive transport models following Daval et al. (2009) showed several limitations, and prompt for an improved description of passivation processes that includes the diffusive properties of secondary phases (Poonoosamy et al., 2020). The results of the ongoing microfluidic experiments in combination with advanced pore-scale modelling will provide new insights regarding application and extension of the description of surface passivation processes to be included in (continuum-scale) reactive transport models.</p><p>Daval D., Martinez I., Corvisier J., Findling N., Goffé B. and Guyotac F. (2009) Carbonation of Ca-bearing silicates, the case of wollastonite: Experimental investigations and kinetic modelling. Chem. Geol. 265(1–2), 63-78.</p><p>Poonoosamy J., Curti E., Kosakowski G., Van Loon L. R., Grolimund D. and Mäder U. (2016) Barite precipitation following celestite dissolution in a porous medium: a SEM/BSE and micro XRF/XRD study. Geochim. Cosmochim. Acta 182, 131-144.</p><p>Poonoosamy J., Klinkenberg M., Deissmann G., Brandt F., Bosbach D., Mäder U. and Kosakowski G. (2020) Effects of solution supersaturation on barite precipitation in porous media and consequences on permeability: experiments and modelling. Geochim. Cosmochim. Acta 270, 43-60.</p>

Modeling biochemically driven mineral precipitation in anaerobic biofilms

1999 ◽  
Vol 39 (7) ◽  
pp. 57-64 ◽  
Author(s):  
A. J. Cooke ◽  
R. K. Rowe ◽  
B. E. Rittmann ◽  
I. R. Fleming
Keyword(s):  
Porous Media ◽  
Flow System ◽  
Substrate Utilization ◽  
Porous Media Flow ◽  
Ecological Interactions ◽  
Mineral Precipitation ◽  
Biofilm Growth ◽  
Dominant Component ◽  
Fixed Film ◽  
Film Reactor

A numerical model links the build-up of mineral precipitate (primarily CaCO3) and the anaerobic activity of biofilms, which occur in granular material permeated with leachate from a municipal solid waste landfill. The model represents the porous-media flow system as a collection of elements in which each element acts as a separate, fixed-film reactor. The model represents biofilm growth for microorganisms carrying out acetogenesis of propionate and methanogenesis of acetate. It also directly links substrate utilization to mineral precipitation and accounts for the accumulation of inert biomass on the porous media at any time or position along the length of the column. Thus, the model describes the ecological interactions among fermenters, methanogens, inert biomass, and mineral precipitate. Although substrate utilization by the active microorganisms drives the entire system, mineral precipitate becomes a dominant component in the biofilm.

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