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Electricity generation from rice bran in microbial fuel cells

View Article: PubMed Central - PubMed

ABSTRACT

Background: Rice bran is a by-product of the rice milling process and mostly discarded in Japan. Although many studies have shown that microbial fuel cells (MFCs) are able to generate electricity from organic wastes, limited studies have examined MFCs for generating electricity from rice bran.

Findings: Laboratory-scale single-chamber MFCs were inoculated with paddy field soil and supplied with rice bran for examining electricity generation. Power outputs and microbiome compositions were compared between MFCs containing pure water as the liquid phase (MFC-W) and those containing mineral solution (MFC-M). Polarization analyses showed that both MFCs successfully generated electricity with the maximum power densities of 360 and 520 mW m−2 (based on the projected area of anode) for MFC-W and MFC-M, respectively. Amplicon-sequencing analyses revealed that Trichococcus and Geobacter specifically occurred in anode biofilms in MFC-W and MFC-M, respectively.

Conclusions: The results suggest that rice bran is a feasible fuel by itself for generating electricity in MFCs.

No MeSH data available.


Phylogenetic analyses of bacteria in anode biofilm, cathode biofilm, and electrolyte in MFC-W and MFC-M. a Phylogenetic distribution of bacteria in each sample. b Phylogenetic positions of major sequences in the anode biofilm in MFC-M affiliated with the genus Geobacter. c Phylogenetic positions of major sequences in the anode biofilm in MFC-W affiliated with the genus Trichococcus. In b and c, percentages to the total sequence are shown in parentheses, and numbers at branch nodes are bootstrap values per 100 trials
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Fig4: Phylogenetic analyses of bacteria in anode biofilm, cathode biofilm, and electrolyte in MFC-W and MFC-M. a Phylogenetic distribution of bacteria in each sample. b Phylogenetic positions of major sequences in the anode biofilm in MFC-M affiliated with the genus Geobacter. c Phylogenetic positions of major sequences in the anode biofilm in MFC-W affiliated with the genus Trichococcus. In b and c, percentages to the total sequence are shown in parentheses, and numbers at branch nodes are bootstrap values per 100 trials

Mentions: Phylogenetic compositions of bacteria in anode biofilms, cathode biofilms, and electrolyte suspensions in MFC-W and MFC-M were determined by the sequence analyses of amplified 16S rRNA gene fragments (Fig. 4). We focused on bacteria, since all known exoelectrogens (electricity-generating microbes) are affiliated with the Bacteria (Kumar et al. 2015). Figure 4a shows that the orders Bacteroidales and Clostridiales were ubiquitously found in all samples, while some taxa were specifically detected. For instance, the Desulfuromonadales specifically occurred in the anode biofilm in MFC-M, while the Burkholderiales increased in the cathode biofilms in MFC-W and MFC-M. In addition, the Lactobacillales substantially increased in the anode biofilm in MFC-W.Fig. 4


Electricity generation from rice bran in microbial fuel cells
Phylogenetic analyses of bacteria in anode biofilm, cathode biofilm, and electrolyte in MFC-W and MFC-M. a Phylogenetic distribution of bacteria in each sample. b Phylogenetic positions of major sequences in the anode biofilm in MFC-M affiliated with the genus Geobacter. c Phylogenetic positions of major sequences in the anode biofilm in MFC-W affiliated with the genus Trichococcus. In b and c, percentages to the total sequence are shown in parentheses, and numbers at branch nodes are bootstrap values per 100 trials
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Related In: Results  -  Collection

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Fig4: Phylogenetic analyses of bacteria in anode biofilm, cathode biofilm, and electrolyte in MFC-W and MFC-M. a Phylogenetic distribution of bacteria in each sample. b Phylogenetic positions of major sequences in the anode biofilm in MFC-M affiliated with the genus Geobacter. c Phylogenetic positions of major sequences in the anode biofilm in MFC-W affiliated with the genus Trichococcus. In b and c, percentages to the total sequence are shown in parentheses, and numbers at branch nodes are bootstrap values per 100 trials
Mentions: Phylogenetic compositions of bacteria in anode biofilms, cathode biofilms, and electrolyte suspensions in MFC-W and MFC-M were determined by the sequence analyses of amplified 16S rRNA gene fragments (Fig. 4). We focused on bacteria, since all known exoelectrogens (electricity-generating microbes) are affiliated with the Bacteria (Kumar et al. 2015). Figure 4a shows that the orders Bacteroidales and Clostridiales were ubiquitously found in all samples, while some taxa were specifically detected. For instance, the Desulfuromonadales specifically occurred in the anode biofilm in MFC-M, while the Burkholderiales increased in the cathode biofilms in MFC-W and MFC-M. In addition, the Lactobacillales substantially increased in the anode biofilm in MFC-W.Fig. 4

View Article: PubMed Central - PubMed

ABSTRACT

Background: Rice bran is a by-product of the rice milling process and mostly discarded in Japan. Although many studies have shown that microbial fuel cells (MFCs) are able to generate electricity from organic wastes, limited studies have examined MFCs for generating electricity from rice bran.

Findings: Laboratory-scale single-chamber MFCs were inoculated with paddy field soil and supplied with rice bran for examining electricity generation. Power outputs and microbiome compositions were compared between MFCs containing pure water as the liquid phase (MFC-W) and those containing mineral solution (MFC-M). Polarization analyses showed that both MFCs successfully generated electricity with the maximum power densities of 360 and 520 mW m−2 (based on the projected area of anode) for MFC-W and MFC-M, respectively. Amplicon-sequencing analyses revealed that Trichococcus and Geobacter specifically occurred in anode biofilms in MFC-W and MFC-M, respectively.

Conclusions: The results suggest that rice bran is a feasible fuel by itself for generating electricity in MFCs.

No MeSH data available.