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High Biofilm Conductivity Maintained Despite Anode Potential Changes in a Geobacter-Enriched Biofilm.


ABSTRACT: This study systematically assessed intracellular electron transfer (IET) and extracellular electron transfer (EET) kinetics with respect to anode potential (Eanode ) in a mixed-culture biofilm anode enriched with Geobacter spp. High biofilm conductivity (0.96-1.24?mS?cm-1 ) was maintained during Eanode changes from -0.2 to +0.2?V versus the standard hydrogen electrode (SHE), although the steady-state current density significantly decreased from 2.05 to 0.35?A?m-2 in a microbial electrochemical cell. Substantial increase of the Treponema population was observed in the biofilm anode at Eanode =+0.2?V, which reduced intracellular electron-transfer kinetics associated with the maximum specific substrate-utilization rate by a factor of ten. This result suggests that fast EET kinetics can be maintained under dynamic Eanode conditions in a highly conductive biofilm anode as a result of shift of main EET players in the biofilm anode, although Eanode changes can influence IET kinetics.

SUBMITTER: Dhar BR 

PROVIDER: S-EPMC7377214 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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High Biofilm Conductivity Maintained Despite Anode Potential Changes in a Geobacter-Enriched Biofilm.

Dhar Bipro Ranjan BR   Ryu Hodon H   Ren Hao H   Domingo Jorge W Santo JW   Chae Junkseck J   Lee Hyung-Sool HS  

ChemSusChem 20161121 24


This study systematically assessed intracellular electron transfer (IET) and extracellular electron transfer (EET) kinetics with respect to anode potential (E<sub>anode</sub> ) in a mixed-culture biofilm anode enriched with Geobacter spp. High biofilm conductivity (0.96-1.24 mS cm<sup>-1</sup> ) was maintained during E<sub>anode</sub> changes from -0.2 to +0.2 V versus the standard hydrogen electrode (SHE), although the steady-state current density significantly decreased from 2.05 to 0.35 A m<s  ...[more]

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