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Fermentation 2018, 4(1), 2; https://doi.org/10.3390/fermentation4010002

Mitigation of Volatile Fatty Acid Build-Up by the Use of Soft Carbon Felt Electrodes: Evaluation of Anaerobic Digestion in Acidic Conditions

1
Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), University of León, Avda. de Portugal 41, 24071 León, Spain
2
School of Engineers, Industrial and Informatics, University of León, Campus de Vegazana S/N, 24071 León, Spain
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 26 December 2017 / Accepted: 3 January 2018 / Published: 4 January 2018
(This article belongs to the Special Issue Microbial Production of Added-value Products from Renewable Resources)
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Abstract

Anaerobic digestion and bioelectrochemical systems have great potential to recover energy from waste streams and help overcome common hurdles associated with this process, as integrated technologies. In this study, the benefit of integrating an electrogen-enriched bioanode in a batch anaerobic digester was explored under ambient temperature conditions associated with organic overloading and reactor acidity. An increase in CH4 production was observed in the electrode-containing reactors (0.56 L CH4 kgVS−1 h−1) in comparison with the conventional anaerobic digester (0.14 L CH4 kgVS−1 h−1) during the initial stages of operation. In addition, the mere presence of electrodes operating in open circuit mode resulted in a delay in volatile fatty acid (VFA) build-up. This seems to be associated with the enhancement in VFA consumption due to biomass proliferation on the electrode surface, rather than on electrochemical activity. View Full-Text
Keywords: anaerobic digestion; bioelectrochemical systems; glucose; methane production; acidic conditions anaerobic digestion; bioelectrochemical systems; glucose; methane production; acidic conditions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Moreno, R.; Martínez, E.J.; Escapa, A.; Martínez, O.; Díez-Antolínez, R.; Gómez, X. Mitigation of Volatile Fatty Acid Build-Up by the Use of Soft Carbon Felt Electrodes: Evaluation of Anaerobic Digestion in Acidic Conditions. Fermentation 2018, 4, 2.

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