Immobilization of Arsenate in Artificially Contaminated Kaolinite by the Addition of Magnesium Oxide-based Materials

DOI Web Site 6 Citations 23 References
  • SUZUKI Tasuma
    Department of Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University
  • NAKAMURA Akira
    Department of Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University
  • KATAYAMA Hitomi
    Department of Sustainable Environmental Engineering, Faculty of Engineering, Yamaguchi University
  • NIINAE Masakazu
    Department of Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University
  • NAKATA Hideki
    Technical Development Center, Cement & Construction Materials Company, Ube Industries, Ltd.
  • FUJII Hiroshi
    Technical Development Center, Cement & Construction Materials Company, Ube Industries, Ltd.
  • TASAKA Yukio
    Technical Development Center, Cement & Construction Materials Company, Ube Industries, Ltd.

Bibliographic Information

Other Title
  • 酸化マグネシウム系不溶化剤によるヒ素 (V) 汚染土壌の不溶化処理
  • サンカ マグネシウムケイ フヨウカザイ ニ ヨル ヒソ(Ⅴ)オセン ドジョウ ノ フヨウカ ショリ

Search this article

Abstract

Soil contamination by arsenic is becoming a serious environmental problem worldwide. In this study, a series of experiments were performed to deepen the understanding on the behavior of arsenate in the water-kaolinite-MgO system, with the final objective of evaluating the use of MgO-based materials as an arsenate immobilization agent in soils. Leaching tests performed with leaching solutions of various pH levels and ionic concentrations at a solidliquid ratio of 1:10(w/v)showed that the addition of sufficient amount of MgO effectively immobilized arsenate below 0.01 mg-As/L(the permissible level for leaching tests in Japan)against the exposure to pH 4.0 acid rain for 100 years. Also, experiments using diffusion cells demonstrated that the arsenate desorbed from kaolinite was quickly re-immobilized by MgO addition. These experimental results overall demonstrate that the addition of MgObased materials is a quite effective soil treatment for quick immobilization of arsenate, and that the immobilization effectiveness is long-lasting against exposure to acid rain. However, the MgO dosage needs to be carefully determined considering the decreased capability of kaolinite as an arsenate adsorbent at high pH conditions.

Journal

  • Journal of MMIJ

    Journal of MMIJ 129 (10_11), 650-656, 2013

    The Mining and Materials Processing Institute of Japan

Citations (6)*help

See more

References(23)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top