Electro-fermentation (EF) is an emerging and promising technology consisting in the use of a polarized electrode to control the spectrum of products deriving from anaerobic bioprocesses. Here, the effect of electrode polarization on the fermentation of glucose has been studied with two mixed microbial cultures, both in the absence and in the presence of exogenous redox mediators, to verify the viability of the proposed approach under a broader and previously unexplored range of operating conditions. In unmediated experiments, EF (with the cathode polarized at -700 mV vs. SHE, Standard Hydrogen Electrode) caused an increase in the yield of butyric acid production provided that glucose was consumed along with its own fermentation products (i.e. acetic acid and ethanol). The maximum obtained yield accounted for 0.60 mol mol(-1). Mediated experiments were performed with Neutral Red or Aws at a concentration of 500 mu M both in the absence and in the presence of the electrode polarized at -700 mV or -300 mV vs. SHE, respectively. Mediators showed a high selectivity towards the generation of n-butyric acid isomer from the condensation of acetate and ethanol, hence suggesting that they provided microbial cells with the required reducing power otherwise deriving from glucose in unmediated experiments. (C) 2019 Elsevier B.V. All rights reserved.
机构:
Prince Songkla Univ, Fac Engn, Energy Technol Program, Hat Yai 90110, Thailand
Prince Songkla Univ, Biomass Convers Energy & Chem BioMEC Res Unit, Fac Sci & Technol, Pattani 94000, ThailandPrince Songkla Univ, Fac Engn, Energy Technol Program, Hat Yai 90110, Thailand
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Univ Idaho, Environm Sci Program, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA
Liang, Shaobo
Gliniewicz, Karol
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Univ Idaho, Dept Biol Sci, Moscow, ID 83844 USA
Univ Idaho, Inst Bioinformat & Evolutionary Studies, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA
Gliniewicz, Karol
Mendes-Soares, Helena
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Univ Idaho, Dept Biol Sci, Moscow, ID 83844 USA
Univ Idaho, Inst Bioinformat & Evolutionary Studies, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA
Mendes-Soares, Helena
Settles, Matthew L.
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Univ Idaho, Dept Biol Sci, Moscow, ID 83844 USA
Univ Idaho, Inst Bioinformat & Evolutionary Studies, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA
Settles, Matthew L.
Forney, Larry J.
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Univ Idaho, Dept Biol Sci, Moscow, ID 83844 USA
Univ Idaho, Inst Bioinformat & Evolutionary Studies, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA
Forney, Larry J.
Coats, Erik R.
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Univ Idaho, Dept Civil Engn, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA
Coats, Erik R.
McDonald, Armando G.
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Univ Idaho, Environm Sci Program, Moscow, ID 83844 USA
Univ Idaho, Dept Forest Rangeland & Fire Sci, Renewable Mat Program, Moscow, ID 83844 USAUniv Idaho, Environm Sci Program, Moscow, ID 83844 USA