Removal Mechanism in Anionic Co-precipitation with Hydroxides in Acid Mine Drainage Treatment

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  • TOKORO Chiharu
    Department of Creative Science and Engineering, Faculty of Science and Engineering, Waseda University

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Acid mine drainage from approximately 80 abandoned or closed Japanese mines has been treated by neutralization over the last forty years. A more efficient and cost-effective treatment process is required, as the national government spends billions of yen each year to protect the environment from acid mine drainage discharge. Surface complexation at the interface between hydroxides such as ferrihydrite or aluminum hydroxide and wastewater is the most important mechanism for the removal of dilute toxic ions. We have categorized the immobilization mechanism of inorganic toxic elements at the hydroxide solid/liquid interface into surface complexation and surface precipitation. We have introduced this concept using experimental methods to understand their mechanism, for example arsenate co-precipitation with ferrihydrite, fluorine co-precipitation with aluminum hydroxide, and boron co-precipitation with magnesium hydroxide. From detailed investigations using isotherm formation, X-ray diffractometry, and Fourier-transform infrared spectroscopy analysis, we found that co-precipitation achieved a more efficient removal of toxic anions than simple adsorption, because of surface precipitation or surface complexation of multiple complexes.

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  • 環境資源工学

    環境資源工学 62 (1), 3-9, 2015

    一般社団法人 環境資源工学会

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