Oxidative Dissolution of Sulfide Minerals in Porous Media Under Evaporative Conditions: Multiphase Experiments and Process‐Based Modeling DOI
Navid Ahmadi, Muhammad Muniruzzaman, Jacopo Cogorno

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 61(1)

Published: Dec. 26, 2024

Abstract The dissolution of sulfide minerals in subsurface porous media has important environmental implications. We investigate the oxidative pyrite under evaporative conditions and advance a mechanistic understanding interactions between multiple physical processes mineral/surface reactions. performed set experiments which initially water saturated anoxic soil columns, containing top layer pyrite, are exposed to atmosphere no evaporation (single‐phase) natural (two‐phase) conditions. was monitored by non‐invasive high‐resolution measurements oxygen pH. Additionally, we developed applied multiphase multicomponent reactive transport model quantitatively describe experimental outcomes elucidate interplay physico‐chemical mechanisms controlling extent dissolution. results confirm that single‐phase constrained slow diffusive liquid phase. In contrast, during evaporation, evolution fluid phases interphase mass transfer imposed distinct constraints on dynamics oxidation. Initially, invasion gaseous phase led fast delivery high concentrations zone thus markedly increased oxidation acidity/sulfate production. However, such enhanced release reaction products progressively limited over time as drying prevailed inhibited transient displacement also found control distribution aqueous species formation secondary creating spatio‐temporally variable redox

Language: Английский

Impact of diffuse layer processes on contaminant forward and back diffusion in heterogeneous sandy-clayey domains DOI
Muhammad Muniruzzaman, Massimo Rolle

Journal of Contaminant Hydrology, Journal Year: 2020, Volume and Issue: 237, P. 103754 - 103754

Published: Dec. 17, 2020

Language: Английский

Citations

28
Start-up of a “zero-discharge” recirculating aquaculture system using woodchip denitrification, constructed wetland, and sand infiltration DOI Creative Commons
Jani Pulkkinen, Anna‐Kaisa Ronkanen, Antti Pasanen

et al.

Aquacultural Engineering, Journal Year: 2021, Volume and Issue: 93, P. 102161 - 102161

Published: April 2, 2021

Recirculating aquaculture systems (RAS) discharge management limits the development of sector, because RAS do not automatically result in low nutrient emissions. Research has helped develop such as wetlands and woodchip bioreactors that have been adopted by Danish commercial model trout farms. To further concept, we modelled built a novel "zero-discharge" recirculating system with an annual capacity approximately 14 tonnes. The aim this paper is to describe entire concept present results from start-up phase whole system. includes treatment effluent (overflow sludge supernatant) using hybrid solution bioreactor, constructed vertical wetland, sand infiltration. Using three-step process, nitrate, phosphorus, organic matter are decreased acceptable levels reuse water process reducing need for new raw water. In first nine months operation, field was used end-of-pipe ensure safe recirculate fish. During winter, temperature dropped 2.7 degrees filter, but frost did reach any processes. It therefore appears can operate sufficiently even winter conditions. year bioreactor remove 97 % although slow caused be N-limited. On average, 79 92 inflow phosphate concentration removed respectively. wetland filter (35 %), longer than designed actual residence, it leached more expected. Further experimentation needed identify financial applicability performance during higher feeding rates.

Language: Английский

Citations

26
Transport and Surface Complexation in Subsurface Flow-through Systems DOI Creative Commons
Massimo Rolle, Lucien Stolze, Jacopo Cogorno

et al.

Reviews in Mineralogy and Geochemistry, Journal Year: 2025, Volume and Issue: 91A(1), P. 353 - 381

Published: March 28, 2025

Language: Английский

Citations

0
Inhomogeneous porewater geochemistry in unconsolidated argillaceous sediments: Implications for porewater extraction protocols and characterization of solute mobilization DOI
Wenkai Qiu, Teng Ma, Yao Du

et al.

Chemical Geology, Journal Year: 2025, Volume and Issue: unknown, P. 122813 - 122813

Published: April 1, 2025

Language: Английский

Citations

0
Mechanistic models supporting uncertainty quantification of water quality predictions in heterogeneous mining waste rocks: a review DOI Creative Commons
Muhammad Muniruzzaman, Daniele Pedretti

Stochastic Environmental Research and Risk Assessment, Journal Year: 2020, Volume and Issue: 35(5), P. 985 - 1001

Published: Oct. 1, 2020

Abstract Polluted drainage from weathering of sulfide-rich waste rock deposits can cause long-term impairment to waterways and biodiversity near mining sites. Mechanistic models represent established tools support the predictions quantity quality drainage, their associated risks. Yet, model-based in typical systems are ubiquitously uncertain because strongly heterogeneous nature these deposits. Embedding heterogeneity within predictive modeling is complicated by magnitude level knowledge heterogeneity, large number scale-dependent parameters feeding model equations. This review encompasses deterministic stochastic approaches that emphasize consolidated emerging solutions deal with for rocks. Physical (e.g., variability texture, hydraulic pneumatic properties), geochemical mineralogy kinetic parameters), thermal heterogeneities evaluated. The points out importance as a fundamental approach embed uncertainty decisions. Regulators decision makers must be convinced benefit using modeling, which still considered belong mainly academic sphere.

Language: Английский

Citations

25
Process-based modeling of electrokinetic-enhanced bioremediation of chlorinated ethenes DOI
Riccardo Sprocati,

John Flyvbjerg,

Nina Tuxen

et al.

Journal of Hazardous Materials, Journal Year: 2020, Volume and Issue: 397, P. 122787 - 122787

Published: April 22, 2020

Language: Английский

Citations

24
Impact of surface complexation and electrostatic interactions on pH front propagation in silica porous media DOI
Lucien Stolze, Jakob B. Wagner, Christian Danvad Damsgaard

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2020, Volume and Issue: 277, P. 132 - 149

Published: March 20, 2020

Language: Английский

Citations

22
Assessment of geochemical modeling applications and research hot spots—a year in review DOI
Reza Khalidy, Rafael M. Santos

Environmental Geochemistry and Health, Journal Year: 2021, Volume and Issue: 43(9), P. 3351 - 3374

Published: March 2, 2021

Language: Английский

Citations

19
Weathering of unsaturated waste rocks from Kevitsa and Hitura mines: Pilot-scale lysimeter experiments and reactive transport modeling DOI Creative Commons
Muhammad Muniruzzaman, Teemu Karlsson, Navid Ahmadi

et al.

Applied Geochemistry, Journal Year: 2021, Volume and Issue: 130, P. 104984 - 104984

Published: May 12, 2021

The fundamental understanding of hydrogeochemical processes leading to toxic drainage in mining environments is utmost importance predict the impact activities waste facilities and design effective measures for mitigation environmental risk. This study investigates weathering behavior different types mine rocks, with considerably mineralogical textural properties, by performing long-term (>3 years) pilot-scale lysimeter experiments combined multiphase multicomponent reactive transport modeling. were carried out a series five setups, packed unsaturated rocks collected from Kevitsa Hitura sites Finland, under influence outdoor atmospheric conditions. We focus on temporal dynamics rock effluents' chemistry showing remarkably compositions experiments. low-sulfide containing pyroxene serpentinite lead alkaline drainage, characterized higher pH (up 9.5) lower dissolved constituents (e.g., up 420 mg/L SO4, 89 μg/L Ni). In contrast, effluents mica schist which have relatively sulfide abundance, show characteristics acidic (~4.3) orders magnitude aqueous concentrations 3100 130 results also that presence fraction finer particles leads faster dissolution rate thus concentrations. experimental quantitatively interpreted modeling, allowed capturing complex dynamic trends concentration levels observed lysimeters.

Language: Английский

Citations

19
Coupling soil/atmosphere interactions and geochemical processes: A multiphase and multicomponent reactive transport approach DOI Creative Commons
Navid Ahmadi, Muhammad Muniruzzaman, Riccardo Sprocati

et al.

Advances in Water Resources, Journal Year: 2022, Volume and Issue: 169, P. 104303 - 104303

Published: Aug. 30, 2022

The exchange of gas components across the subsurface/atmosphere interface influences multiphase flow and reactive transport in subsurface is crucial for many biogeochemical processes, emission greenhouse gases, fate volatile contaminants. In this study, we present a modeling approach to simulate non-isothermal multicomponent coupled compartments. model based on porous medium/free domain which Navier-Stokes equation used describe single-phase (gaseous) free-flow subdomain Darcy's law applied two-phase medium (i.e., two-domain approach). implementation performed by coupling COMSOL Multiphysics PhreeqcRM, enables investigation interplay between multi-physical processes flow, mass heat transport) compartments geochemical reactions medium. We first set benchmark examples key features proposed are tested against other numerical simulators an analytical solution. Successively, take advantage unique capabilities explore conservative domain. results show that control location zones extent mineral dissolution) changing spatiotemporal distribution fluid phases enhancing interphase transfer such as oxygen carbon dioxide.

Language: Английский

Citations

13