Quantitative modeling of a neutralization and co-precipitation process with ferrihydite for the simultaneous removal of as(V) and Hg(II)

Tatsuya Kato, T. Uchida, M. Yagisawa, S. Hobo, Chiharu Tokoro*

*この研究の対応する著者

    研究成果: Conference contribution

    抄録

    In this study, quantitative modeling was carried out for the treatment of simulated waste water containing As(V), Zn(II) and Hg(II) as toxic elements, and Fe(III), Na(I) and sulfate as coaxing ions. The objective was to predict the pH and residual concentrations of all the elements in solution after the neutralization/co-precipitation treatment. To accomplish this, the removal mechanism for As(V) and Hg(II) by ferrihydrite precipitation was first investigated for simulated waste water containing only As(V) or Hg(II). From the experimental results, it was confirmed that the removal mechanism involves not only surface complexation but also surface precipitation. However, surface complexation is the main mechanism for As(V) and Hg(II) removal to meet the target levels regulated in Japan. Next, the surface complexation model was constructed for the removal of As(V) and Hg(II) by ferrihydrite. The specific surface area and site density were determined from reference values proposed by Dzombak and Morel (1990). By comparing the experimental and calculated results, it was confirmed that our constructed model could successfully represent the experimental results. Furthermore, the surface complexation model was coupled with chemical equilibrium calculations and applied to the neutralization of simulated waste water containing As(V), Hg(II), Zn(II), Na(I), Fe(III) and sulfate. The constructed model could successfully represent the pH edge for As(V), Hg(II), Zn(II), Fe(III) and SO4 2- removal. In addition, the constructed model could represent the ion balance. Thus, our constructed model is useful to estimate the amount of neutralizer that is needed to achieve a target pH.

    本文言語English
    ホスト出版物のタイトルIMPC 2016 - 28th International Mineral Processing Congress
    出版社Canadian Institute of Mining, Metallurgy and Petroleum
    2016-September
    ISBN(電子版)9781926872292
    出版ステータスPublished - 2016 1月 1
    イベント28th International Mineral Processing Congress, IMPC 2016 - Quebec City, Canada
    継続期間: 2016 9月 112016 9月 15

    Other

    Other28th International Mineral Processing Congress, IMPC 2016
    国/地域Canada
    CityQuebec City
    Period16/9/1116/9/15

    ASJC Scopus subject areas

    • 地球化学および岩石学
    • 地盤工学および土木地質学
    • 機械工学
    • 地表過程

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