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Removal of manganese in acidic solutions utilizing Achromobacter sp. strain QBM-4 isolated from mine drainage

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  • Qiming Mao, Hunan Agricultural University
  • ,
  • Dongning Wei, Hunan Agricultural University
  • ,
  • Binghua Yan, Hunan Agricultural University
  • ,
  • Shuang Luo
  • Thomas William Seviour
  • Zongsu Wei
  • Xiande Xie, Hunan Agricultural University
  • ,
  • Lin Luo, Hunan Agricultural University

Biological approaches with the core of manganese-oxidizing bacteria (MnOB) are cheap and environmentally friendly solutions for the removal of bivalent manganese (Mn(II)). These bacteria typically worked well in the pH range of 5.5 – 8.0 but poorly under pH below 5.5. In this study, we isolated an acid-tolerant manganese-oxidizing bacterium (Achromobacter sp. strain QBM-4) from acid mine drainage (AMD), which was effective for Mn(II) removal at pH 4.0. Under optimized treatment conditions (i.e., 60.0 mg·L−1 Mn(II), 100.0 mg·L−1 Fe(III), and 35.0 °C), the Mn(II) removal efficiency reached 93.6 ± 0.8% at an initial pH of 4.0. Approximately 68.0% of the Mn(II) was removed through adsorption, and the remainder was attributed to oxidation. The Mn(II) oxidation rate was ~ 0.05 mM·d−1 (initial pH of 4.0), comparable with other MnOB performing under near-neutral solutions. Ferric ions (Fe(III)) can form amorphous iron hydroxides, facilitating sorptive removal and catalytic oxidation of Mn(II). In contrast, ferrous ions (Fe(II)) reductively dissolve manganese oxides, inhibiting Mn(II) removal. A mechanism for the biological removal of Mn(II) was proposed, and the performance of Achromobacter sp. strain QBM-4 was further verified in three types of mine drainage.

TidsskriftProcess Safety and Environmental Protection
Sider (fra-til)920-928
Antal sider9
StatusUdgivet - sep. 2022

Bibliografisk note

Funding Information:
We would like to thank to Maria Angeles Busturia, Yeray Duque, Ascensión Valle and Eunate Arana for their clinical and technical help and thanks to Julia G Fenn (INC team) and Alejandro Urberuaga for their English translation. The study was financially supported by the Department of Health and Department of Education of the Government of the Basque Country (research grant: 200211011 , IT-472-07 ), Fundación Salud 2000 , Grant number 23301 and Fundación IKERTU . We extend our gratitude to the Sociedad Española de Endocrinología Pediátrica for the award “José Igea 2002” funded by Pfizer . Finally, we want to thank the children and their parents for their continued participation and involvement in this research.

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© 2022 The Institution of Chemical Engineers

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