Efficiencies of Chelating Agents for Removal of Cadmium by Electrokinetic Soil Remediation

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  • NIINAE Masakazu
    Department of Urban and Environmental Engineering, Kyoto University
  • AOKI Yuji
    Graduate Student, Kyoto University
  • AOKI Kenji
    Department of Urban and Environmental Engineering, Kyoto University

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Other Title
  • 動電学的土壌浄化法におけるキレート試薬によるカドミウム除去効果
  • ドウデンガクテキ ドジョウ ジョウカホウ ニ オケル キレート シヤク ニ ヨル カドミウム ジョキョ コウカ

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Description

In electrokinetic soil remediation, contaminants are removed from soil and groundwater by the action of an electrical potential applied across electrodes embedded in the contaminated medium. An important advantage of electrokinetic soil remediation over other in-situ processes such as soil flushing is the capability to control over the movement of the contaminants. As the motion of the contaminants is confined by the electric field, there is little dispersion outside the treatment zone. Furthermore, the process is effective for soils with low and variable permeability. Soluble substances can be removed effectively by electroosmosis and ionic migration. However, contaminants that are adsorbed on the soil or are present as precipitates can not be effectively removed. In particular, the solubility of most heavy metals may be significantly reduced at elevated pH values. When impurities such as iron oxides are present, electorokinetics alone may not be effective in the extraction of heavy metals due to the higher acid / base buffer capacity. Also, acidification of the medium might cause large weight losses by dissolution of part of the solid matrix. It would, therefore, be better if the treatment were performed at neutral pH.<BR>In the present study, the effectiveness of introducing complexing agents to enhance the removal of cadmium from kaolinite in the region of neutral pH by ionic migration is examined. The complexing agents selected were ethylenediaminetetraacetic acid (EDTA) and citric acid. The effectiveness of EDTA and citric acid for removing cadmium was investigated, and it was found that EDTA was more effective than citric acid. It was also found that the electrical potential applied across the electrodes played the important role in removing cadmium.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 120 (1), 49-53, 2004

    The Mining and Materials Processing Institute of Japan

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