The effects of physical and geochemical heterogeneities on hydro-geochemical transport and effective reaction rates

Journal of Contaminant Hydrology
Adam L AtchleyReed M Maxwell

Abstract

The role of coupled physical and geochemical heterogeneities in hydro-geochemical transport is investigated by simulating three-dimensional transport in a heterogeneous system with kinetic mineral reactions. Ensembles of 100 physically heterogeneous realizations were simulated for three geochemical conditions: 1) spatially homogeneous reactive mineral surface area, 2) reactive surface area positively correlated to hydraulic heterogeneity, and 3) reactive surface area negatively correlated to hydraulic heterogeneity. Groundwater chemistry and the corresponding effective reaction rates were calculated at three transverse planes to quantify differences in plume evolution due to heterogeneity in mineral reaction rates and solute residence time (τ). The model is based on a hypothetical CO2 intrusion into groundwater from a carbon capture utilization and storage (CCUS) operation where CO2 dissolution and formation of carbonic acid created geochemical dis-equilibrium between fluids and the mineral galena that resulted in increased aqueous lead (Pb(2+)) concentrations. Calcite dissolution buffered the pH change and created conditions of galena oversaturation, which then reduced lead concentrations along the flow path. Near the leak kin...Continue Reading

References

May 12, 2001·Environmental Science & Technology·Steven B YabusakiC Steefel
Feb 24, 2006·Journal of Contaminant Hydrology·Uma Seeboonruang, Timothy R Ginn
Sep 8, 2007·Environmental Science & Technology·Reed M MaxwellRonald W Harvey
Sep 15, 2007·Journal of Contaminant Hydrology·Jeffrey A Cunningham, Ziad J Fadel
Mar 28, 2009·Geochemical Transactions·Susan CarrollRoger Aines
Jul 9, 2010·Journal of Contaminant Hydrology·Marco DentzJesus Carrera
May 17, 2012·Environmental Science & Technology·Lindsay A BearupJohn E McCray
Apr 27, 2013·Environmental Science & Technology·Adam L AtchleyAlexis K Navarre-Sitchler

Citations

Feb 28, 2015·Journal of Contaminant Hydrology·Alicia Sanz-PratOlaf A Cirpka
Feb 26, 2019·Ecology and Evolution·Katherine F WentzKatharine N Suding

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