Immobilization of Some Heavy Metals in Contaminated Soils by Stabilization with Spent Carbide

DOI Web Site 21 References
  • Konagawa Tatsuo
    Construction Industry Division, Town office of Mihama Construction Industry Division, Town office of Mihama
  • Sasaki Seiich
    Wakayama National College of Technology Wakayama National College of Technology
  • Arai Katsuhiko
    University of Fukui University of Fukui
  • Nagaosa Yukio
    University of Fukui University of Fukui

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Other Title
  • カーバイド滓を用いた重金属汚染土の不溶化
  • カーバイドシ オ モチイタ ジュウキンゾク オセンド ノ フヨウカ

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Abstract

The purpose of this research work is to examine how efficiently such harmful heavy metals as Pb, Cd, Cu, Cr, Zn, Sb in soils can be immobilized with spent carbide. The leaching characteristics of Sb(III) and Cr(VI) in contaminated soils and municipal solid waste were investigated by use of ICP analysis. The results suggest that the concentration of heavy metals in the clay decreases on leaching, and also that the pH remarkably affects the degree of leaching. The dissolution of Sb(III), Cu in soils was found to be prevented by addition of spent carbide over the wider pH regions. The leaching behavior of heavy metals from spent carbide-treated soils may be explained in terms of an exchange reaction of metals and the solubility product of their hydroxides.

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