Removal of chromate in a permeable reactive barrier using zero-valent iron

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Abstract

Chromate is a commonly found groundwater contaminant. Permeable reactive barriers containing zero-valent iron as iron filings are able to remove the chromate by a combined reduction/precipitation reaction. However, due to the passivation of the reduction capability of the iron surfaces by the precipitation of chromate and other groundwater constituents, the barrier may have a limited capacity for chromate removal. By performing a column experiment with iron filings it was shown that the capacity was slightly lower at high chromate concentration (500 ppm) in comparison to low concentration (20 ppm). Mixing in sand had no significant enhancing effect on the removal capacity, in contrast to a pH adjustment of the groundwater to pH 4, which significantly increased the removal capacity.
Original languageEnglish
Title of host publicationGroundwater Quality 2001 : Natural and Enhanced Restoration of Groundwater Pollution. Selected papers
EditorsS. Thornton, S. Oswald
Place of PublicationOxfordshire, UK
PublisherIAHS Press
Publication date2002
Pages409-414
Publication statusPublished - 2002
Event3rd International Conference on Groundwater Quality - University of Sheffield, Sheffield, United Kingdom
Duration: 18 Jun 200121 Jun 2001
Conference number: 3

Conference

Conference3rd International Conference on Groundwater Quality
Number3
LocationUniversity of Sheffield
Country/TerritoryUnited Kingdom
CitySheffield
Period18/06/200121/06/2001
SeriesIAHS Publication
Number275

Keywords

  • passivation
  • heavy metal
  • column experiment
  • reduction
  • chromium

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