Biochar improves sediment microbial fuel cell performance in low conductivity freshwater sediment

Chen, Shanshan; Tang, Jiahuan; Fu, Li; Yuan, Yong; Zhou, Shungui

doi:10.1007/s11368-016-1452-z

Cited by 83 publications

(31 citation statements)

References 50 publications

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“…These significant differences between SMFCs could be ascribed to the following factors: (i) The degradation process operated by bacteria is very slow; (ii) in NA‐SMFCs, part of the electrons could have been used by bacteria to reduce metals present in sediments and water with less current; (iii) low‐ V generation in the NA‐SMFCs due to minimum oxygen diffusion near the cathode; and (iv) A‐SMFCs gave 50% more power production than NA‐SMFCs due to mixing of water and availability of oxygen at cathode. The access of lower concentration of electron donors to the anode is the main reason for less sustainable power production in SMFCs as compared with MFC …”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2017

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“…Normalized to the anodic surface area, the MP density was determined as 4. respectively. The MP density of MFC-A3 was comparable to 8.72 mW/m 2 from graphite disk anode [21], 4.5 mW/m 2 from carbon fiber anode [22], and 5 mW/m 2 from graphite plate anode [12]. MP density generated from MFCs depends on several factors such as the characters of the anode and cathode, and the sediment, reactor configuration, and operation parameters [3,[23][24][25].…”

Section: Performance Of Smfcsmentioning

confidence: 88%

“…Although that increasing attentions were paid to SMFC to evaluate factors to their performance [10][11][12], and to explore novel functions [13,14], few efforts were made to develop novel anode configuration. An et al fabricated a chessboard-type anode with one hundred rigid graphite plates as electrode material [15].…”

Section: Introductionmentioning

confidence: 99%

Submission of “Electric power generation from sediment microbial fuel cells with graphite rod array anode”

Wang

Lim

2019

Environmental Engineering Research

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Sediment microbial fuel cells (SMFCs) illustrated great potential for powering environmental sensors and bioremediation of sediments. In the present study, array anodes for SMFCs were fabricated with graphite rods as anode material and stainless steel plate as electric current collector to make it inconvenient to in situ settle down and not feasible for large-scale application. The results demonstrated that maximum power of 89.4 μW was obtained from three graphite rods, twice of 43.3 μW for two graphite rods. Electrochemical impedance spectroscopy revealed that three graphite rods resulted in anodic resistance of 61.2 Ω, relative to 76.0 Ω of two graphite rods. It was probably caused by the parallel connection of the graphite rods, as well as more biomass which could reduce the charge transfer resistance of the biofilm anode. The presently designed array configuration possesses the advantages of easy to enlarge the surface area, decrease in anodic resistance because of the parallel connection of each graphite rod, and convenience to berry into sediment by gravity. Therefore, the as prepared array node would be an effective method to fabricate large-scale SMFC and make it easy to in situ applicate in natural sediments.

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“…Some common problems occurred during the remediation of organic compounds in SMFCs; for example, the anode chamber pH became acidic, and the cathode chamber became alkaline because of overlying water electrolysis . Another issue is an unequal dissemination of nutrients in the chambers, as ammonium intensification in the anode chamber and phosphate and nitrate accumulation in the cathode chamber . These problems not only affect the bioremediation but also cause biological clogging.…”

Section: Applications Of Smfcsmentioning

confidence: 99%

A review on sediment microbial fuel cells as a new source of sustainable energy and heavy metal remediation: mechanisms and future prospective

Abbas

Rafatullah

Ismail

et al. 2017

Int. J. Energy Res.

125

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Summary Sediment microbial fuel cells (SMFCs) are different from microbial fuel cells because they are completely anoxic and lack a membrane. SMFCs are a novel technology for the simultaneous production of renewable energy and bioremediation of heavy metals. Recently, SMFCs have attracted the attention of many researchers because of their moderate functioning parameters and ability to use a range of biodegradable substrates like glucose, glutamic acid, river water, cysteine, acetate, and starch. The inocula used in SMFCs include river sediment, marine sediment, and wastewater. For power generation, many exoelectrogens in SMFCs have the ability to transfer electrons from electrodes by using natural electron shuttles. Exoelectrogens use four primary pathways to transfer electrons to the electrodes, including short‐range electron transfer through redox‐active proteins, soluble electron shuttling molecules, long‐range electron transport by conductive pili, and direct interspecies electron transfer. The most dominant mechanism is long‐range electron transfer via conductive pili because pili have metal‐like conductivity. The powering by microbes is an emerging technique for the remediation of heavy metals from sediments. The pathways for transferring electrons in electrotrophs operate in the opposite direction from those in exoelectrogens. To further upgrade SMFC technology, this review targets the prototype, operating factors, working mechanisms, applications, and future perspectives of SMFCs. Copyright © 2017 John Wiley & Sons, Ltd.

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Biochar improves sediment microbial fuel cell performance in low conductivity freshwater sediment

Cited by 83 publications

References 50 publications

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

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

Submission of “Electric power generation from sediment microbial fuel cells with graphite rod array anode”

A review on sediment microbial fuel cells as a new source of sustainable energy and heavy metal remediation: mechanisms and future prospective

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