Electricity generation from an inorganic sulfur compound containing mining wastewater by acidophilic microorganisms

Gaofeng Ni, Stephan Christel, Pawel Roman, Zhen Lim Wong, Martijn F.M. Bijmans, Mark Dopson*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

Sulfide mineral processing often produces large quantities of wastewaters containing acid-generating inorganic sulfur compounds. If released untreated, these wastewaters can cause catastrophic environmental damage. In this study, microbial fuel cells were inoculated with acidophilic microorganisms to investigate whether inorganic sulfur compound oxidation can generate an electrical current. Cyclic voltammetry suggested that acidophilic microorganisms mediated electron transfer to the anode, and that electricity generation was catalyzed by microorganisms. A cation exchange membrane microbial fuel cell, fed with artificial wastewater containing tetrathionate as electron donor, reached a maximum whole cell voltage of 72 ± 9 mV. Stepwise replacement of the artificial anolyte with real mining process wastewater had no adverse effect on bioelectrochemical performance and generated a maximum voltage of 105 ± 42 mV. 16S rRNA gene sequencing of the microbial consortia resulted in sequences that aligned within the genera Thermoplasma, Ferroplasma, Leptospirillum, Sulfobacillus and Acidithiobacillus. This study opens up possibilities to bioremediate mining wastewater using microbial fuel cell technology.

Original languageEnglish
Pages (from-to)568-575
JournalResearch in Microbiology
Volume167
Issue number7
DOIs
Publication statusPublished - 2016

Keywords

  • Acidophile
  • Electricity generation
  • Microbial fuel cell
  • Mining
  • Wastewater

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