ARSENITE INSOLUBILIZATION USING FERRATE AND WATER TREATMENT SLUDGE AND EVALUATION OF INHIBITORY EFFECT ON ARSENIC RESOLUBILIZATION

DOI Web Site 19 References
  • HOSOYA Yuki
    岩手大学大学院総合科学研究科地域創生専攻
  • OGASAWARA Yoshino
    岩手大学大学院総合科学研究科地域創生専攻
  • YAMANISHI Keita
    岩手大学理工学部システム創成工学科社会基盤・環境コース
  • ISHIKAWA Nao
    岩手大学 理工学部システム創成工学科社会基盤・環境コース
  • SASAMOTO Makoto
    岩手大学 技術部
  • ITO Ayumi
    岩手大学 理工学部システム創成工学科社会基盤・環境コース

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Other Title
  • 鉄(VI)酸塩とAl含有浄水汚泥の併用による亜ヒ酸の酸化・不溶化と再溶解抑制効果の評価

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<p> Insolubilization of arsenite (As(III)) in water sample was investigated through a combined treatment using ferrate (Fe(VI)) and water treatment sludge (WTS). Arsenate (As(V)) formed by As(III) oxidation with Fe(VI) was successfully insolubilized by coprecipitation with hydroxide of Al derived from WTS suspension, which was acidified with a dilute HCl solution. Whereas As(V) insolubilized with ferrate only or WTS suspension only was resolubilized under alkali or acidic condition, the combined treatment inhibited the resolubilization of As(V) under weakly acidic and alkali conditions. Furthermore, As(V) insolubilized with Fe(VI) only was resolubilized via Fe(III) reduction under the presence of dithionite as a reducing agent. However, the treatment using WTS suspension only or the combined treatment inhibited As resolubilization under the same reducing condition.</p><p> These results indicate that the combined treatment using Fe(VI) and WTS suspension could prevent the insolubilized As(V) from being resolubilized even though the environmental conditions such as pH or ORP are changed after application of the treated sample to lands.</p>

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