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

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