Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent
This study examined effective removal methods for high amounts of manganese (Mn) and zinc (Zn) in acid mine drainage (AMD) by addition of different neutralizing agents (NaOH and NaClO) and synthesized birnessite (δ-MnO2) using two-type AMD samples which Mn and Zn concentrations were 778 and 410 mg L...
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| Format: | Article |
| Language: | English |
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The Mining and Materials Processing Institute of Japan
2022-11-01
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| Series: | Journal of MMIJ |
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| Online Access: | https://www.jstage.jst.go.jp/article/journalofmmij/138/11/138_160/_pdf/-char/en |
| _version_ | 1827868282581942272 |
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| author | Shigeshi FUCHIDA Shota TAJIMA Chiharu TOKORO |
| author_facet | Shigeshi FUCHIDA Shota TAJIMA Chiharu TOKORO |
| author_sort | Shigeshi FUCHIDA |
| collection | DOAJ |
| description | This study examined effective removal methods for high amounts of manganese (Mn) and zinc (Zn) in acid mine drainage (AMD) by addition of different neutralizing agents (NaOH and NaClO) and synthesized birnessite (δ-MnO2) using two-type AMD samples which Mn and Zn concentrations were 778 and 410 mg L−1 for A mine and 18.0 and 5.51 mg L−1 for B mines, respectively. The precipitation mechanism of these metal ions was investigated by geochemical modeling (PHREEQC) and X-ray absorption near edge structure (XANES) analysis. Mn concentrations were below the effluent standard (10 mg L−1) at pH 9–10 with the NaOH neutralization, whereas it was accomplished at lower pH (6–7) condition with the NaClO addition; it could act as an oxidizing agent, resulting that most of Mn precipitated as δ-MnO2. Zn concentrations decreased below the effluent standard (2 mg L−1) at pH 8–9 using both neutralizing agents. XANES analysis results indicated Zn was removed by the surface complexation formation on manganite and δ-MnO2 surface. More effective removal of Mn and Zn from AMD was found around pH 6 when a sufficient amount of δ-MnO2 was added to both AMD before the NaOH neutralization; a geochemical model coupling charge distribution multisite ion complexation revealed the triple-corner-sharing on δ-MnO2 was the most reasonable mechanism. Our result suggests that the presence of sufficient δ-MnO2 was the most effective for high Mn and Zn contents AMD treatment; however, ferrous ion (Fe2+) can inhibit the adsorption reaction and decompose δ-MnO2. Thus, pre-precipitation of Fe2+ is required to enhance the effect of δ-MnO2 on Mn and Zn removals from AMD. |
| first_indexed | 2024-03-12T15:29:27Z |
| format | Article |
| id | doaj.art-549cb36530c94c27bc1c66de69232bf2 |
| institution | Directory Open Access Journal |
| issn | 1881-6118 1884-0450 |
| language | English |
| last_indexed | 2024-03-12T15:29:27Z |
| publishDate | 2022-11-01 |
| publisher | The Mining and Materials Processing Institute of Japan |
| record_format | Article |
| series | Journal of MMIJ |
| spelling | doaj.art-549cb36530c94c27bc1c66de69232bf22023-08-10T09:09:05ZengThe Mining and Materials Processing Institute of JapanJournal of MMIJ1881-61181884-04502022-11-011381116016910.2473/journalofmmij.138.160journalofmmijInvestigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing AgentShigeshi FUCHIDA0Shota TAJIMA1Chiharu TOKORO2Associate Professor, Department of Ocean Sciences, Tokyo University of Marine Science and TechnologyGraduated master student, Graduate School of Creative Science and Engineering, Waseda UniversityProfessor, Faculty of Science and Engineering, Waseda UniversityThis study examined effective removal methods for high amounts of manganese (Mn) and zinc (Zn) in acid mine drainage (AMD) by addition of different neutralizing agents (NaOH and NaClO) and synthesized birnessite (δ-MnO2) using two-type AMD samples which Mn and Zn concentrations were 778 and 410 mg L−1 for A mine and 18.0 and 5.51 mg L−1 for B mines, respectively. The precipitation mechanism of these metal ions was investigated by geochemical modeling (PHREEQC) and X-ray absorption near edge structure (XANES) analysis. Mn concentrations were below the effluent standard (10 mg L−1) at pH 9–10 with the NaOH neutralization, whereas it was accomplished at lower pH (6–7) condition with the NaClO addition; it could act as an oxidizing agent, resulting that most of Mn precipitated as δ-MnO2. Zn concentrations decreased below the effluent standard (2 mg L−1) at pH 8–9 using both neutralizing agents. XANES analysis results indicated Zn was removed by the surface complexation formation on manganite and δ-MnO2 surface. More effective removal of Mn and Zn from AMD was found around pH 6 when a sufficient amount of δ-MnO2 was added to both AMD before the NaOH neutralization; a geochemical model coupling charge distribution multisite ion complexation revealed the triple-corner-sharing on δ-MnO2 was the most reasonable mechanism. Our result suggests that the presence of sufficient δ-MnO2 was the most effective for high Mn and Zn contents AMD treatment; however, ferrous ion (Fe2+) can inhibit the adsorption reaction and decompose δ-MnO2. Thus, pre-precipitation of Fe2+ is required to enhance the effect of δ-MnO2 on Mn and Zn removals from AMD.https://www.jstage.jst.go.jp/article/journalofmmij/138/11/138_160/_pdf/-char/enacid mine drainageoxidizing agentbirnessitecoprecipitationmanganesecd-music model |
| spellingShingle | Shigeshi FUCHIDA Shota TAJIMA Chiharu TOKORO Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent Journal of MMIJ acid mine drainage oxidizing agent birnessite coprecipitation manganese cd-music model |
| title | Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent |
| title_full | Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent |
| title_fullStr | Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent |
| title_full_unstemmed | Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent |
| title_short | Investigation on Effective Neutralization Process of Acid Mine Drainage Containing High Amount of Mn and Zn by Additions of δ-MnO2 Adsorbent and Oxidizing Agent |
| title_sort | investigation on effective neutralization process of acid mine drainage containing high amount of mn and zn by additions of δ mno2 adsorbent and oxidizing agent |
| topic | acid mine drainage oxidizing agent birnessite coprecipitation manganese cd-music model |
| url | https://www.jstage.jst.go.jp/article/journalofmmij/138/11/138_160/_pdf/-char/en |
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