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 |
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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 |
巻 | 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 11 → 2016 9月 15 |
Other
Other | 28th International Mineral Processing Congress, IMPC 2016 |
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国/地域 | Canada |
City | Quebec City |
Period | 16/9/11 → 16/9/15 |
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