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

Bente H. Hyldegaard, Rasmus Jakobsen, Eline B. Weeth, Niels D. Overheu, David B. Gent, Lisbeth M. Ottosen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

16 Citationer (Scopus)

Abstrakt

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.

OriginalsprogEngelsk
Sider (fra-til)680-688
Antal sider9
TidsskriftJournal of Hazardous Materials
Vol/bind368
DOI
StatusUdgivet - 15 apr. 2019

Programområde

  • Programområde 2: Vandressourcer

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