Spatiotemporal evolution of iron and sulfate concentrations during riverbank filtration: Field observations and reactive transport modeling

Woonghee Lee, Etienne Bresciani, Seongnam An, Ilka Wallis, Vincent Post, Seunghak Lee, Peter K. Kang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number103697
JournalJournal of Contaminant Hydrology
Volume234
DOIs
StatePublished - Oct 2020

Bibliographical note

Funding Information:
The authors acknowledge support from the Korea Research Fellowship program funded by the Ministry of Science and ICT through the National Research Foundation of Korea (grant 2016H1D3A1908042), a grant (17AWMP-B066761-05) from the AWMP Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government, the Future Research Program (2E29660) funded by the Korea Institute of Science and Technology (KIST), and the Korea Environment Industry & Technology Institute (KEITI) through Subsurface Environment Management (SEM) Project (2018002440003, 2018002440006) funded by the Korea Ministry of Environment (MOE). PKK also acknowledges the College of Science & Engineering at the University of Minnesota and the George and Orpha Gibson Endowment for its generous support of Hydrogeology, and the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources (LCCMR).

Funding Information:
The authors acknowledge support from the Korea Research Fellowship program funded by the Ministry of Science and ICT through the National Research Foundation of Korea (grant 2016H1D3A1908042 ), a grant ( 17AWMP-B066761-05 ) from the AWMP Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government , the Future Research Program ( 2E29660 ) funded by the Korea Institute of Science and Technology (KIST), and the Korea Environment Industry & Technology Institute (KEITI) through Subsurface Environment Management (SEM) Project ( 2018002440003 , 2018002440006 ) funded by the Korea Ministry of Environment (MOE) . PKK also acknowledges the College of Science & Engineering at the University of Minnesota and the George and Orpha Gibson Endowment for its generous support of Hydrogeology, and the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources (LCCMR).

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • Groundwater
  • Iron and Sulfate
  • Pyrite oxidation
  • Reaction constant
  • Reactive transport modeling
  • Riverbank filtration

PubMed: MeSH publication types

  • Journal Article

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