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Chromium (VI) Retrieval from Chromium Ore Processing Residues by Electrokinetic Treatment
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Natural Resources and Sustainable Development. Univ Littoral Cote dOpale, Lille, France.
Univ Littoral Cote dOpale, Lille, France.
Direction territoriale Nord-Picardie, Lille, France.
Direction territoriale Nord-Picardie, Lille, France.
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2017 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 228, no 9, article id 378Article in journal (Refereed) Published
Abstract [en]

Electrokinetics (EK) was investigated as a possible technique for in-situ treatment of leachable chromium at a built site contaminated with chromium ore processing residues (COPR). A preliminary EK experiment was carried out at the laboratory scale on an undisturbed COPR core sample. Methods applied for material and pore water characterization before and after EK treatment addressed physical aspects by laser diffraction granulometry, pycnometry and pore water content, mineralogical aspects by X-ray diffraction, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, and chemical aspects by inductively coupled plasma-atomic emission spectroscopy and atomic absorption spectroscopy for elemental composition, spectrophotometry for Cr(VI) analysis, and potentiometry for pH determination. EK was run at 1 V/cm with no external constraints on current intensity. The EK experiment reached an extraction of 72% of the total leachable Cr(VI) after only 10 days of treatment and 84% after 20 days. Material texture, composition, and pH remained similar. These results indicate that EK presents a potential solution for extracting leachable Cr(VI) from COPR sites. The impounded COPR material appeared to be heterogeneous in composition at all scales, from field to lab sample, adding to the challenge of in-situ treatment.

Place, publisher, year, edition, pages
2017. Vol. 228, no 9, article id 378
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Environmental Sciences related to Agriculture and Land-use
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URN: urn:nbn:se:uu:diva-337277DOI: 10.1007/s11270-017-3562-7ISI: 000410827400061OAI: oai:DiVA.org:uu-337277DiVA, id: diva2:1168752
Available from: 2017-12-21 Created: 2017-12-21 Last updated: 2018-01-22Bibliographically approved

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Lehoux, Alizée P.

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