Biodegradation of organic matter and anodic microbial communities analysis in sediment microbial fuel cells with/without Fe(III) oxide addition

Xu, Xun; Zhao, Qingliang; Wu, Mingsong; Ding, Jing; Zhang, Weixian

doi:10.1016/j.biortech.2016.11.126

Cited by 96 publications

(30 citation statements)

References 31 publications

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“…Sediment microbial fuel cells (SMFCs) or benthic microbial fuel cells (BMFCs) are a particular class of MFCs for electricity generation and sediment remediation, utilizing the electro-potential contrast between oxic and anoxic compartments of SMFCs. 5,6 The general prototype SMFC consists of an anode enclosed in marine sediment and a cathode positioned in the surface water. Microbes break down the organic and inorganic compounds present in the sediment and release protons and electrons.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry and microbiology of microbial fuel cells treating marine sediments polluted with heavy metals

et al. 2018

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The industrial contamination of marine sediments with chromium, copper and nickel in Penang, Malaysia was addressed with bio-remediation, coupled with power generation, using in situ sediment microbial cells (SMFCs) under various conditions. The efficiency of aerated sediment microbial fuel cells (A-SMFCs) and non-aerated sediment microbial fuel cells (NA-SMFCs) was studied. The A-SMFCs generated a voltage of 580.5 mV between 50 and 60 days, while NA-SMFCs produced a voltage of 510 mV between 60 and 80 days. The cell design point for A-SMFCs was 2 kU, while for NA-SMFCs it was 200 U.In both SMFCs, the maximum current values relating to forward scanning, reverse scanning and oxidation/reduction peaks were recorded on the 80 th day. The anode showed maximum additional capacitance on the 80 th day (A-SMFC: 2.7 F cm À2; and NA-SMFC: 2.2 F cm À2). The whole cell electrochemical impedance using the Nyquist model was 21 U for A-SMFCs and 15 U for NA-SMFCs.After glucose enrichment, the impedance of A-SMFCs was 24.3 U and 14.6 U for NA-SMFCs. After 60 days, the A-SMFCs reduced the maximum amount of Cr(VI) to Cr(III) ions (80.70%) and Cu(II) to Cu(I) ions (72.72%), and showed maximum intracellular uptake of Ni(II) ions (80.37%); the optimum remediation efficiency of NA-SMFCs was after 80 days toward Cr(VI) ions (67.36%), Cu(II) ions (59.36%) and Ni(II) ions (52.74%). Both SMFCs showed highest heavy metal reduction and power generation at a pH of 7.0. SEM images and 16S rRNA gene analysis showed a diverse bacterial community in both A-SMFCs and NASMFCs. The performance of A-SMFCs showed that they could be exercised as durable and efficient technology for power production and the detoxification of heavy metal sediments. The NA-SMFCs could also be employed where anaerobic fermentation is required.

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Section: Introductionmentioning

confidence: 99%

Electrochemistry and microbiology of microbial fuel cells treating marine sediments polluted with heavy metals

et al. 2018

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“…Our results confirm the exoelectroactivity of Pseudomonas species and their high potential not only in power production but also in toxic metal remediation. The less diversity of microbes on both SMFCs is encouraging evidence that these SMFCs may be more useful to source of energy and bioremediation of toxic metals because due to less diversity of microbes, they quickly adjust to the environment of SMFC and give better performance . All mechanisms of exoelectrogenic microorganisms are operated in less diverse biofilms of microbes than more diversified biofilms.…”

Section: Resultsmentioning

confidence: 90%

Enhanced bioremediation of toxic metals and harvesting electricity through sediment microbial fuel cell

et al. 2017

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Summary Performance of sediment microbial fuel cells (SMFCs) with aerated (A‐SMFC) and nonaerated (NA‐SMFC) cathodes was evaluated at different operating conditions in toxic metal removal and power generation. The A‐ and NA‐SMFC open‐circuit voltages were respectively about 665 and 275 mV, with quite steady performances for 120 days. The cell design points of both SMFCs were calculated by implementing polarization curves, and they were at 1 kΩ (power density 8.1 mW/m2 and current density 0.0504 mA/m2 with voltage 150 mV) for NA‐SMFC and 100 Ω (power density 252.81 mW/m2 and current density 0.954 mA/m2 with voltage of 275 mV) for A‐SMFC, respectively. Cathode potentials were at 30 kΩ 290 mV (NA‐SMFC) and 500 mV (A‐SMFC). As to the anode, at 30 KΩ, it was −180 mV (NA‐SMFC) and 190 mV (A‐SMFC). The voltammetry profiles of A‐SMFC showed maximum current (forward scan, 22.7 μA; reverse scan, −19.4 μA) followed by NA‐SMFC (forward scan, 11.3 μA; reverse scan, −9.5 μA). The cell design points of A‐SMFC and NA‐SMFC were altered after pH and temperature amendments at 200 and 700 Ω, respectively. As to metal removal rate, the maximum arsenic cadmium and lead removal was observed in A‐SMFC at pH 7.0 (77.70%, 90.86%, and 83.91%) and 45°C (66.22%, 79.03%, and 71.17%). Scanning electron microscopy confirmed, at pH 7.0 and 45°C, an optimal biofilm growth at cathode and anode graphite of both SMFCs. After 120 days of operation, genomic DNA was extracted from biofilms and analyzed for rDNA 16S sequences. Similarity search was performed by using Basic Local Alignment Search Tool algorithm against the National Center for Biotechnology Information Gen Bank showing Pseudomonas spp. dominance at both anode and cathode. The results revealed that the A‐SMFC system could be employed as an effective and long‐term tool for power generation as well as stimulated bioremediation of the polluted sediments.

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“…Couples of research analyzed the microbial community structure of anodic biofilm in SMFCs [18,19], while few research paid attentions to the influences of burial depth of anode on microbial diversity.…”

Section: -mentioning

confidence: 99%

Burial depth of anode affected the bacterial community structure of sediment microbial fuel cells

et al. 2019

Environmental Engineering Research

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Sediment microbial fuel cells (SMFCs) are attractive devices to in situ power environmental monitoring sensors and bioremediate contaminated soils/sediments. Burial depth of the anode was verified to affect the performance of SMFCs. The present research evaluated the differences in microbial community structure of anodic biofilms located at different depth. It was demonstrated that both microbial diversity and community structure of anodic biofilms were influenced by the depth of anode location. Microbial diversity decreased with increased anodic depth. The number of the operational taxonomic units (OTUs) was determined as 1438 at the anode depth of 5 cm, which reduced to 1275 and 1005 at 10 cm and 15 cm, respectively. Cluster analysis revealed that microbial communities of 5 cm and 10 cm were clustered together, separated from the original sediment and 15 cm. Proteobacteria was the predominant phylum in all samples, followed by Bacteroidetes and Firmicutes. Beta-and Gamma-proteobacteria were the most abundant classes. A total of 23 OTUs showed high identity to 16S rRNA gene of exoelectrogens such as Geobacter and Pseudomonas. The present results provided insights into the effects of anode depth on the performance of SMFC from the perspectives of microbial community structure.

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Biodegradation of organic matter and anodic microbial communities analysis in sediment microbial fuel cells with/without Fe(III) oxide addition

Cited by 96 publications

References 31 publications

Electrochemistry and microbiology of microbial fuel cells treating marine sediments polluted with heavy metals

Electrochemistry and microbiology of microbial fuel cells treating marine sediments polluted with heavy metals

Enhanced bioremediation of toxic metals and harvesting electricity through sediment microbial fuel cell

Burial depth of anode affected the bacterial community structure of sediment microbial fuel cells

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