Lee, Woonghee Bresciani, Etienne An, Seongnam Wallis, Ilka Post, Vincent Lee, Seunghak Kang, Peter K. 2024-01-19T16:32:10Z 2024-01-19T16:32:10Z 2021-09-02 2020-10 0169-7722 https://pubs.kist.re.kr/handle/201004/118043 Riverbank filtration is a commonly-used technology that improves water quality by passing river water through aquifers. In this study, a riverbank filtration site in Busan, South Korea, was investigated to understand the spatiotemporal evolution of high iron and sulfate concentrations observed in the riverbank-filtered water. Discrepancies between the nonreactive transport results and field measurements suggest that iron-sulfate-related geochemical reactions play a major role in the spatiotemporal evolution of the hydrochemical properties. Pyrite oxidation was hypothesized to be the main process driving the release of iron and sulfate. To test this hypothesis, a reactive transport model was developed, that implemented pyrite oxidation as a kinetic process and subsequent ferrous iron oxidation and ferric iron precipitation as equilibrium processes. The model accurately captured the temporal evolution of sulfate; however, iron concentrations were underestimated. Sensitivity tests revealed that adjusting reaction constants significantly improved the prediction of iron concentrations. The results of this study suggest that pyrite oxidation can affect the hydrochemistry of riverbank-filtered water and highlight the potential limitations of using theoretical reaction constants in field modeling applications. English ELSEVIER MANAGED AQUIFER RECHARGE ARSENIC MOBILIZATION DISSOLUTION RATES PYRITE FORMATION BANK FILTRATION ORGANIC-MATTER REDOX GROUNDWATER OXIDATION KINETICS Spatiotemporal evolution of iron and sulfate concentrations during riverbank filtration: Field observations and reactive transport modeling Article 10.1016/j.jconhyd.2020.103697 1 JOURNAL OF CONTAMINANT HYDROLOGY, v.234 JOURNAL OF CONTAMINANT HYDROLOGY 234 scie scopus 000576786400005 2-s2.0-85089587554 Environmental Sciences Geosciences, Multidisciplinary Water Resources Environmental Sciences & Ecology Geology Water Resources Article MANAGED AQUIFER RECHARGE ARSENIC MOBILIZATION DISSOLUTION RATES PYRITE FORMATION BANK FILTRATION ORGANIC-MATTER REDOX GROUNDWATER OXIDATION KINETICS Groundwater Riverbank filtration Pyrite oxidation Iron and Sulfate Reactive transport modeling Reaction constant