Challenges in electrochemical remediation of chlorinated solvents in natural groundwater aquifer settings

Bente Højlund Hyldegaard*, Rasmus Jakobsen, Eline Weeth, Niels Overheu, David Gent, Lisbeth M. Ottosen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Establishment of electrochemical zones for remediation of dissolved chlorinated solvents in natural settings was studied. An undivided 1D-experimental column set-up was designed for the assessment of the influence of site-extracted contaminated groundwater flowing through a sandy aquifer material, on the execution of laboratory testing. A three-electrode system composed of palladium coated pure iron cathodes and a cast iron anode was operated at 12 mA under varying flow rates. The natural settings added complexity through a diverse groundwater chemistry and resistance in the sand. In addition, significant precipitation of iron released through anode corrosion was observed. Nevertheless, the complex system was successfully modelled with a simple geochemical model using PHREEQC. A ranking of the significances of system parameters on the laboratory execution of electrochemical remediation in natural settings was proposed: Geological properties > anode corrosion > site-extracted contaminated groundwater > the carbonate system > sulphate > hydrology > less significant unidentified parameters. This study provides insight in actual challenges that need to be overcome for in situ electrochemical remediation.
Original languageEnglish
JournalJournal of Hazardous Materials
Volume368
Pages (from-to)680-688
ISSN0304-3894
DOIs
Publication statusPublished - 2019

Keywords

  • Electrochemical
  • Geology
  • Groundwater
  • Modelling
  • Ranking

Cite this

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title = "Challenges in electrochemical remediation of chlorinated solvents in natural groundwater aquifer settings",
abstract = "Establishment of electrochemical zones for remediation of dissolved chlorinated solvents in natural settings was studied. An undivided 1D-experimental column set-up was designed for the assessment of the influence of site-extracted contaminated groundwater flowing through a sandy aquifer material, on the execution of laboratory testing. A three-electrode system composed of palladium coated pure iron cathodes and a cast iron anode was operated at 12 mA under varying flow rates. The natural settings added complexity through a diverse groundwater chemistry and resistance in the sand. In addition, significant precipitation of iron released through anode corrosion was observed. Nevertheless, the complex system was successfully modelled with a simple geochemical model using PHREEQC. A ranking of the significances of system parameters on the laboratory execution of electrochemical remediation in natural settings was proposed: Geological properties > anode corrosion > site-extracted contaminated groundwater > the carbonate system > sulphate > hydrology > less significant unidentified parameters. This study provides insight in actual challenges that need to be overcome for in situ electrochemical remediation.",
keywords = "Electrochemical, Geology, Groundwater, Modelling, Ranking",
author = "Hyldegaard, {Bente H{\o}jlund} and Rasmus Jakobsen and Eline Weeth and Niels Overheu and David Gent and Ottosen, {Lisbeth M.}",
year = "2019",
doi = "10.1016/j.jhazmat.2018.12.064",
language = "English",
volume = "368",
pages = "680--688",
journal = "Journal of Hazardous Materials",
issn = "0304-3894",
publisher = "Elsevier",

}

Challenges in electrochemical remediation of chlorinated solvents in natural groundwater aquifer settings. / Hyldegaard, Bente Højlund; Jakobsen, Rasmus; Weeth, Eline; Overheu, Niels; Gent, David; Ottosen, Lisbeth M.

In: Journal of Hazardous Materials, Vol. 368, 2019, p. 680-688.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Challenges in electrochemical remediation of chlorinated solvents in natural groundwater aquifer settings

AU - Hyldegaard, Bente Højlund

AU - Jakobsen, Rasmus

AU - Weeth, Eline

AU - Overheu, Niels

AU - Gent, David

AU - Ottosen, Lisbeth M.

PY - 2019

Y1 - 2019

N2 - Establishment of electrochemical zones for remediation of dissolved chlorinated solvents in natural settings was studied. An undivided 1D-experimental column set-up was designed for the assessment of the influence of site-extracted contaminated groundwater flowing through a sandy aquifer material, on the execution of laboratory testing. A three-electrode system composed of palladium coated pure iron cathodes and a cast iron anode was operated at 12 mA under varying flow rates. The natural settings added complexity through a diverse groundwater chemistry and resistance in the sand. In addition, significant precipitation of iron released through anode corrosion was observed. Nevertheless, the complex system was successfully modelled with a simple geochemical model using PHREEQC. A ranking of the significances of system parameters on the laboratory execution of electrochemical remediation in natural settings was proposed: Geological properties > anode corrosion > site-extracted contaminated groundwater > the carbonate system > sulphate > hydrology > less significant unidentified parameters. This study provides insight in actual challenges that need to be overcome for in situ electrochemical remediation.

AB - Establishment of electrochemical zones for remediation of dissolved chlorinated solvents in natural settings was studied. An undivided 1D-experimental column set-up was designed for the assessment of the influence of site-extracted contaminated groundwater flowing through a sandy aquifer material, on the execution of laboratory testing. A three-electrode system composed of palladium coated pure iron cathodes and a cast iron anode was operated at 12 mA under varying flow rates. The natural settings added complexity through a diverse groundwater chemistry and resistance in the sand. In addition, significant precipitation of iron released through anode corrosion was observed. Nevertheless, the complex system was successfully modelled with a simple geochemical model using PHREEQC. A ranking of the significances of system parameters on the laboratory execution of electrochemical remediation in natural settings was proposed: Geological properties > anode corrosion > site-extracted contaminated groundwater > the carbonate system > sulphate > hydrology > less significant unidentified parameters. This study provides insight in actual challenges that need to be overcome for in situ electrochemical remediation.

KW - Electrochemical

KW - Geology

KW - Groundwater

KW - Modelling

KW - Ranking

U2 - 10.1016/j.jhazmat.2018.12.064

DO - 10.1016/j.jhazmat.2018.12.064

M3 - Journal article

VL - 368

SP - 680

EP - 688

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

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