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Fe/S Redox-Coupled Mercury Transformation Mediated by Acidithiobacillus ferrooxidans ATCC 23270 under Aerobic and/or Anaerobic Conditions.
Liu, Yue; Gu, Chenyun; Liu, Hongchang; Zhou, Yuhang; Nie, Zhenyuan; Wang, Yirong; Chen, Lu; Xia, Jinlan.
Afiliación
  • Liu Y; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
  • Gu C; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
  • Liu H; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
  • Zhou Y; Key Lab of Biometallurgy of Ministry of Education of China, Central South University, Changsha 410083, China.
  • Nie Z; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
  • Wang Y; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
  • Chen L; Key Lab of Biometallurgy of Ministry of Education of China, Central South University, Changsha 410083, China.
  • Xia J; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Microorganisms ; 11(4)2023 Apr 14.
Article en En | MEDLINE | ID: mdl-37110452
Bioleaching processes or microbially mediated iron/sulfur redox processes in acid mine drainage (AMD) result in mineral dissolution and transformation, the release of mercury and other heavy metal ions, and changes in the occurrence forms and concentration of mercury. However, pertinent studies on these processes are scarce. Therefore, in this work, the Fe/S redox-coupled mercury transformation mediated by Acidithiobacillus ferrooxidans ATCC 23270 under aerobic and/or anaerobic conditions was studied by combining analyses of solution behavior (pH, redox potential, and Fe/S/Hg ion concentrations), the surface morphology and elemental composition of the solid substrate residue, the Fe/S/Hg speciation transformation, and bacterial transcriptomics. It was found that: (1) the presence of Hg2+ significantly inhibited the apparent iron/sulfur redox process; (2) the addition of Hg2+ caused a significant change in the composition of bacterial surface compounds and elements such as C, N, S, and Fe; (3) Hg mainly occurred in the form of Hg0, HgS, and HgSO4 in the solid substrate residues; and (4) the expression of mercury-resistant genes was higher in earlier stages of growth than in the later stages of growth. The results indicate that the addition of Hg2+ significantly affected the iron/sulfur redox process mediated by A. ferrooxidans ATCC 23270 under aerobic, anaerobic, and coupled aerobic-anaerobic conditions, which further promoted Hg transformation. This work is of great significance for the treatment and remediation of mercury pollution in heavy metal-polluted areas.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Microorganisms Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Microorganisms Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza