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Microbial community composition is unaffected by anode potential.

Xiuping Zhu1, Matthew D Yates, Marta C Hatzell

  • 1Department of Civil and Environmental Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.

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Summary
This summary is machine-generated.

Anode potential significantly impacts bioelectrochemical system (BES) performance. Exoelectrogenic biofilms adapt electron transfer pathways, with optimal current generation depending on specific anode potentials and biofilm biomass.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Electrochemistry

Background:

  • Conflicting reports exist on how anode potentials affect bioelectrochemical systems (BES) and exoelectrogenic biofilms.
  • Positive potentials are often linked to improved performance, while others show negative potentials yield higher current densities.

Purpose of the Study:

  • To investigate the effect of a wide range of anode potentials on biofilm biomass, electroactivity, and community structure in microbial electrolysis cells.
  • To resolve the controversy surrounding optimal anode potentials for BES performance.

Main Methods:

  • Single-chamber microbial electrolysis cells were operated with a wastewater inoculum at various set anode potentials (-0.25, -0.09, 0.21, 0.51, and 0.81 V vs SHE).
  • Biofilm biomass, electroactivity (maximum current production), and microbial community structure (via pyrosequencing) were analyzed.

Main Results:

  • Maximum current production increased with anode potentials from -0.25 to 0.21 V but decreased at 0.51 and 0.81 V.
  • Higher maximum currents correlated positively with increased biofilm biomass.
  • Pyrosequencing revealed similar biofilm communities dominated by Geobacter sulfurreducens-like bacteria across all tested potentials.

Conclusions:

  • Exoelectrogenic communities demonstrate self-regulation of extracellular electron transfer pathways in response to varying anode potentials.
  • Biofilm biomass plays a crucial role in determining current output at different anode potentials.