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External resistances applied to MFC affect core microbiome and swine manure treatment efficiencies

Microbial fuel cells (MFCs) can be designed to combine water treatment with concomitant electricity production. Animal manure treatment has been poorly explored using MFCs, and its implementation at full-scale primarily relies on the bacterial distribution and activity within the treatment cell. This study reports the bacterial community changes at four positions within the anode of two almost identically operated MFCs fed swine manure. Changes in the microbiome structure are described according to the MFC fluid dynamics and the application of a maximum power point tracking system (MPPT) compared to a fixed resistance system (Ref-MFC). Both external resistance and cell hydrodynamics are thought to heavily influence MFC performance. The microbiome was characterised both quantitatively (qPCR) and qualitatively (454-pyrosequencing) by targeting bacterial 16S rRNA genes. The diversity of the microbial community in the MFC biofilm was reduced and differed from the influent swine manure. The adopted electric condition (MPPT vs fixed resistance) was more relevant than the fluid dynamics in shaping the MFC microbiome. MPPT control positively affected bacterial abundance and promoted the selection of putatively exoelectrogenic bacteria in the MFC core microbiome (Sedimentibacter sp. and gammaproteobacteria). These differences in the microbiome may be responsible for the two-fold increase in power production achieved by the MPPT-MFC compared to the Ref-MFC

This research was financially supported by the Spanish Government (CTQ2014-53718-R) and the Catalan Government (2014 FI-B 00093)

PLoS One, 2016, vol. 11, núm. 10, e0164044

Public Library of Science (PLoS)

Manager: Ministerio de Economía y Competitividad (Espanya)
Author: Vilajeliu Pons, Anna
Bañeras Vives, Lluís
Puig Broch, Sebastià
Molognoni, Daniele
Vilà-Rovira, Albert
Hernández-del Amo, Elena
Balaguer i Condom, Maria Dolors
Colprim Galceran, Jesús
Date: 2016 October 4
Abstract: Microbial fuel cells (MFCs) can be designed to combine water treatment with concomitant electricity production. Animal manure treatment has been poorly explored using MFCs, and its implementation at full-scale primarily relies on the bacterial distribution and activity within the treatment cell. This study reports the bacterial community changes at four positions within the anode of two almost identically operated MFCs fed swine manure. Changes in the microbiome structure are described according to the MFC fluid dynamics and the application of a maximum power point tracking system (MPPT) compared to a fixed resistance system (Ref-MFC). Both external resistance and cell hydrodynamics are thought to heavily influence MFC performance. The microbiome was characterised both quantitatively (qPCR) and qualitatively (454-pyrosequencing) by targeting bacterial 16S rRNA genes. The diversity of the microbial community in the MFC biofilm was reduced and differed from the influent swine manure. The adopted electric condition (MPPT vs fixed resistance) was more relevant than the fluid dynamics in shaping the MFC microbiome. MPPT control positively affected bacterial abundance and promoted the selection of putatively exoelectrogenic bacteria in the MFC core microbiome (Sedimentibacter sp. and gammaproteobacteria). These differences in the microbiome may be responsible for the two-fold increase in power production achieved by the MPPT-MFC compared to the Ref-MFC
This research was financially supported by the Spanish Government (CTQ2014-53718-R) and the Catalan Government (2014 FI-B 00093)
Format: application/pdf
Citation: 025756
ISSN: 1932-6203
Document access: http://hdl.handle.net/10256/12956
Language: eng
Publisher: Public Library of Science (PLoS)
Collection: MINECO/PE 2015-2017/CTQ2014-53718-R
Reproducció digital del document publicat a: http://dx.doi.org/10.1371/journal.pone.0164044
Articles publicats (D-EQATA)
Is part of: PLoS One, 2016, vol. 11, núm. 10, e0164044
Rights: Attribution 3.0 Spain
Rights URI: http://creativecommons.org/licenses/by/3.0/es/
Subject: Energia de la biomassa
Biomass energy
Cel·la de combustible biològic
Microbial fuel cells
Title: External resistances applied to MFC affect core microbiome and swine manure treatment efficiencies
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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