Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor
Manganese (Mn) is a major element in various aqueous and soil environments that is sometimes highly concentrated in mine water and other mineral processing wastewater. In this study, we investigated Mn removal from alkaline mine water (pH > 9) with an Mn-coated silica sand packed into a pilot-sca...
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| Format: | Article |
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MDPI AG
2022-01-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/1/99 |
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| author | Shigeshi Fuchida Shota Tajima Takuro Nishimura Chiharu Tokoro |
| author_facet | Shigeshi Fuchida Shota Tajima Takuro Nishimura Chiharu Tokoro |
| author_sort | Shigeshi Fuchida |
| collection | DOAJ |
| description | Manganese (Mn) is a major element in various aqueous and soil environments that is sometimes highly concentrated in mine water and other mineral processing wastewater. In this study, we investigated Mn removal from alkaline mine water (pH > 9) with an Mn-coated silica sand packed into a pilot-scale column reactor and examined the specific reaction mechanism using X-ray absorption near-edge structure (XANES) analysis and geochemical kinetic modeling. The kinetic effect of dissolved Mn(II) removal by birnessite (δ-Mn(IV)O<sub>2</sub>) at pH 6 and 8 was evaluated at different Mn(II)/Mn(IV) molar ratios of 0.1–10. Our results confirmed the positive effect of the presence of δ-MnO<sub>2</sub> on the short-term removal (60 min) of dissolved Mn. XANES analysis results revealed that δ-MnO<sub>2</sub> was more abundant than Mn(III)OOH in the reactor, which may have accumulated during a long-term reaction (4 months) after the reactor was turned on. A gradual decrease in dissolved Mn(II) concentration with depth was observed in the reactor, and comparison with the kinetic modeling result confirmed that δ-MnO<sub>2</sub> interaction was the dominant Mn removal mechanism. Our results show that δ-MnO<sub>2</sub> contents could play a significant role in controlling Mn removability from mine water in the reactor. |
| first_indexed | 2024-03-10T00:51:56Z |
| format | Article |
| id | doaj.art-7c858c83122640ee83f6211ddaebc74e |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T00:51:56Z |
| publishDate | 2022-01-01 |
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| series | Minerals |
| spelling | doaj.art-7c858c83122640ee83f6211ddaebc74e2023-11-23T14:50:15ZengMDPI AGMinerals2075-163X2022-01-011219910.3390/min12010099Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column ReactorShigeshi Fuchida0Shota Tajima1Takuro Nishimura2Chiharu Tokoro3Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, JapanGraduate School of Creative Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, JapanNagaoka International Corp., 1-8-15 Azuchimachi, Chuo-ku, Osaka 541-0052, JapanFaculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, JapanManganese (Mn) is a major element in various aqueous and soil environments that is sometimes highly concentrated in mine water and other mineral processing wastewater. In this study, we investigated Mn removal from alkaline mine water (pH > 9) with an Mn-coated silica sand packed into a pilot-scale column reactor and examined the specific reaction mechanism using X-ray absorption near-edge structure (XANES) analysis and geochemical kinetic modeling. The kinetic effect of dissolved Mn(II) removal by birnessite (δ-Mn(IV)O<sub>2</sub>) at pH 6 and 8 was evaluated at different Mn(II)/Mn(IV) molar ratios of 0.1–10. Our results confirmed the positive effect of the presence of δ-MnO<sub>2</sub> on the short-term removal (60 min) of dissolved Mn. XANES analysis results revealed that δ-MnO<sub>2</sub> was more abundant than Mn(III)OOH in the reactor, which may have accumulated during a long-term reaction (4 months) after the reactor was turned on. A gradual decrease in dissolved Mn(II) concentration with depth was observed in the reactor, and comparison with the kinetic modeling result confirmed that δ-MnO<sub>2</sub> interaction was the dominant Mn removal mechanism. Our results show that δ-MnO<sub>2</sub> contents could play a significant role in controlling Mn removability from mine water in the reactor.https://www.mdpi.com/2075-163X/12/1/99mine watermanganese oxidationbirnessitepilot-scale column reactor |
| spellingShingle | Shigeshi Fuchida Shota Tajima Takuro Nishimura Chiharu Tokoro Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor Minerals mine water manganese oxidation birnessite pilot-scale column reactor |
| title | Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor |
| title_full | Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor |
| title_fullStr | Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor |
| title_full_unstemmed | Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor |
| title_short | Kinetic Modeling and Mechanisms of Manganese Removal from Alkaline Mine Water Using a Pilot Scale Column Reactor |
| title_sort | kinetic modeling and mechanisms of manganese removal from alkaline mine water using a pilot scale column reactor |
| topic | mine water manganese oxidation birnessite pilot-scale column reactor |
| url | https://www.mdpi.com/2075-163X/12/1/99 |
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