The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals
The severity of environmental pollution from acid mine drainage (AMD) is increasingly garnering attention. In this study, the effects of hydraulic shear forces (achieved by regulating the shaking table’s rotation speed) on Fe<sup>2+</sup> bio-oxidation and Fe<sup>3+</sup> hyd...
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MDPI AG
2020-06-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/6/518 |
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| author | Jun Yang Rui Wang Heru Wang Yongwei Song |
| author_facet | Jun Yang Rui Wang Heru Wang Yongwei Song |
| author_sort | Jun Yang |
| collection | DOAJ |
| description | The severity of environmental pollution from acid mine drainage (AMD) is increasingly garnering attention. In this study, the effects of hydraulic shear forces (achieved by regulating the shaking table’s rotation speed) on Fe<sup>2+</sup> bio-oxidation and Fe<sup>3+</sup> hydrolytic mineralization in an acidic 9K medium-FeSO<sub>4</sub>-<i>Acidithiobacillus ferrooxidans</i> system (simulated AMD) are investigated. Results reveal that a higher shaking speed favors a higher oxidation rate of Fe<sup>2+</sup>, whereas a very low or high shaking speed restricts the removal of Fe<sup>3+</sup>. Shaking table rotation speeds of 120–180 rpm were preferred for biomineralization treatment in the simulated AMD. As the initial concentration of Fe<sup>2+</sup> in the system decreased from 9.67 to 0 g/L in 40 h, the dissolved O<sub>2</sub> (DO) in the solution dropped to its lowest concentration after 20 h and then increased to its initial level between 40 and 120 h. However, the corresponding total Fe (TFe) precipitation efficiency increased with the increasing mineralization time after 40 h. The effect of O<sub>2</sub> supply time on biomineralization revealed that DO was mainly used in Fe<sup>2+</sup> bio-oxidation. After Fe<sup>2+</sup> was completely oxidized by <i>A. ferrooxidans</i>, the precipitation efficiency of TFe was independent of the O<sub>2</sub> supply. |
| first_indexed | 2024-03-10T19:21:54Z |
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| id | doaj.art-884dbf4f067c4c3796e27a7878d191d6 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T19:21:54Z |
| publishDate | 2020-06-01 |
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| series | Minerals |
| spelling | doaj.art-884dbf4f067c4c3796e27a7878d191d62023-11-20T02:54:36ZengMDPI AGMinerals2075-163X2020-06-0110651810.3390/min10060518The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate MineralsJun Yang0Rui Wang1Heru Wang2Yongwei Song3Department of Environmental Engineering, School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, ChinaDepartment of Environmental Engineering, School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, ChinaDepartment of Environmental Engineering, School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, ChinaDepartment of Environmental Engineering, School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, ChinaThe severity of environmental pollution from acid mine drainage (AMD) is increasingly garnering attention. In this study, the effects of hydraulic shear forces (achieved by regulating the shaking table’s rotation speed) on Fe<sup>2+</sup> bio-oxidation and Fe<sup>3+</sup> hydrolytic mineralization in an acidic 9K medium-FeSO<sub>4</sub>-<i>Acidithiobacillus ferrooxidans</i> system (simulated AMD) are investigated. Results reveal that a higher shaking speed favors a higher oxidation rate of Fe<sup>2+</sup>, whereas a very low or high shaking speed restricts the removal of Fe<sup>3+</sup>. Shaking table rotation speeds of 120–180 rpm were preferred for biomineralization treatment in the simulated AMD. As the initial concentration of Fe<sup>2+</sup> in the system decreased from 9.67 to 0 g/L in 40 h, the dissolved O<sub>2</sub> (DO) in the solution dropped to its lowest concentration after 20 h and then increased to its initial level between 40 and 120 h. However, the corresponding total Fe (TFe) precipitation efficiency increased with the increasing mineralization time after 40 h. The effect of O<sub>2</sub> supply time on biomineralization revealed that DO was mainly used in Fe<sup>2+</sup> bio-oxidation. After Fe<sup>2+</sup> was completely oxidized by <i>A. ferrooxidans</i>, the precipitation efficiency of TFe was independent of the O<sub>2</sub> supply.https://www.mdpi.com/2075-163X/10/6/518acid mine drainage<i>Acidithiobacillus ferrooxidans</i>hydraulic shear forcedissolved oxygenbiomineralizationiron hydroxysulfate minerals |
| spellingShingle | Jun Yang Rui Wang Heru Wang Yongwei Song The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals Minerals acid mine drainage <i>Acidithiobacillus ferrooxidans</i> hydraulic shear force dissolved oxygen biomineralization iron hydroxysulfate minerals |
| title | The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals |
| title_full | The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals |
| title_fullStr | The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals |
| title_full_unstemmed | The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals |
| title_short | The Important Role of Dissolved Oxygen Supply Regulated by the Hydraulic Shear Force during the Biosynthesis of Iron Hydroxysulfate Minerals |
| title_sort | important role of dissolved oxygen supply regulated by the hydraulic shear force during the biosynthesis of iron hydroxysulfate minerals |
| topic | acid mine drainage <i>Acidithiobacillus ferrooxidans</i> hydraulic shear force dissolved oxygen biomineralization iron hydroxysulfate minerals |
| url | https://www.mdpi.com/2075-163X/10/6/518 |
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