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Area of Science:

  • Microbial electrochemistry
  • Environmental biotechnology
  • Biotechnology

Background:

  • Biological desulfurization utilizes haloalkaliphilic sulfide-oxidizing bacteria (SOB) to remove sulfide.
  • These bacteria typically use oxygen as the final electron acceptor in this process.

Purpose of the Study:

  • To investigate the potential of SOB to shuttle electrons from sulfide to an electrode, thereby generating electricity.
  • To explore a novel, sustainable method for biodesulfurization.

Main Methods:

  • Reactor solutions from two biodesulfurization installations with distinct SOB communities were analyzed.
  • Sulfide was added to SOB-containing solutions in the absence of oxygen.
  • Electrochemical cells were used to measure current densities at varying anode potentials (+0.1 V vs. Ag/AgCl).

Main Results:

  • Significant average current densities of 0.48 A/m² and 0.24 A/m² were measured for SOB-containing solutions.
  • Negligible current was observed in solutions lacking SOB, indicating the bacteria's crucial role.
  • Differences in current generation were linked to variations in microbial community composition.

Conclusions:

  • Haloalkaliphilic SOB can effectively transfer electrons from sulfide to an electrode, producing electricity.
  • This electron-shuttling capability presents a promising avenue for sustainable desulfurization.
  • Further research into charge storage mechanisms within SOB is warranted.