Issue 11, 2016

Removal of heavy metals from contaminated soil by electrodialytic remediation enhanced with organic acids

Abstract

The soil from an industrial area in Algeria was contaminated with Cr (8370 mg kg−1), Ni (1135 mg kg−1) and zinc (1200 mg kg−1). The electrodialytic remediation of this soil was studied using citric acid and EDTA as facilitating agents. 0.1 M citric acid or EDTA was added directly to the soil before it was introduced in an electrodialytic cell in an attempt to enhance the heavy metal solubility in the interstitial fluid. The more acidic pH in the soil when citric acid was used as the facilitating agent was not enough to mobilize and remove the metals from the soil. Only 7.2% of Ni and 6.7% of Zn were removed from the soil in the test with citric acid. The best results were found with EDTA, which was able to solubilize and complex Zn and Ni forming negatively charged complexes that were transported and accumulated in the anolyte. Complete removal was observed for Ni and Zn in the electrodialytic treatment with EDTA. Minor amounts of Cr were removed with both EDTA and citric acid.

Graphical abstract: Removal of heavy metals from contaminated soil by electrodialytic remediation enhanced with organic acids

Article information

Article type
Paper
Submitted
27 Jun 2016
Accepted
23 Sep 2016
First published
27 Sep 2016

Environ. Sci.: Processes Impacts, 2016,18, 1440-1448

Removal of heavy metals from contaminated soil by electrodialytic remediation enhanced with organic acids

O. Merdoud, C. Cameselle, M. O. Boulakradeche and D. E. Akretche, Environ. Sci.: Processes Impacts, 2016, 18, 1440 DOI: 10.1039/C6EM00380J

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