Estimation of total energy requirement for sewage treatment by a microbial fuel cell with a one-meter air-cathode assuming Michaelis–Menten COD degradation

Yamane, Taiki; Yoshida, Naoko; Sugioka, Mari

doi:10.1039/d1ra03061b

Cited by 21 publications

(15 citation statements)

References 66 publications

(113 reference statements)

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“…The maximum current density (I max ) decreased marginally with the increase in HRT; it was 0.59 A/m 2 at 3.0 h and decreased to 0.49 A/m 2 and 0.33 A/m 2 at 6.9 h and 9.8 h, respectively. The HRT-dependent decrease in electricity generation has been repeatedly observed in the MFC in previous studies [2,22,26]. This decrease was revealed by the low COD due to the extended time required for microbial degradation.…”

Section: Polarization Curvesupporting

confidence: 54%

“…The COD-RE achieved in the MFC indicated an improvement compared to that obtained with our previous MFC AEM , which exhibited 30% COD-RE at HRT = 6 h [26]; the COD-RE increased by approximately twice upon the introduction of carbon brushes. In addition, the CE was drastically reduced to less than 10% of that of the previous MFC without carbon brushes (23%) due to the reduction in specific cathode or separator areas with respect to wastewater volume; the introduction of 12 carbon brushes reduced the specific area from 14 m 2 /m 3 [26] to 3.2 m 2 /m 3 in this study. These results indicate the importance of determining the optimum ratio of carbon brushes to a specific cathode area [37].…”

Section: Cod Removal and Cementioning

confidence: 46%

“…The current density was similar to that generated by a similar MFC core without carbon brushes. The MFC without carbon brushes was also operated in the PST effluent with continuous inflow for 6 h of HRT using 2 Ω of the external resistance and recorded an average current density of 0.32 A/m 2 [26]. The MFC AEM used in this study produced an average of 0.38 A/m 2 for 6 h of HRT.…”

Section: Current Production By the Two Mfcs Throughout The Operationmentioning

confidence: 93%

“…In this study, a cylindrical MFC core (Φ5 cm × 100 cm) with an air cathode [26] prepared from a stainless-steel mesh surrounded by a carbon-based cathode was used along with an IEMs and nonwoven graphite fabric (TOYOBO Co., Ltd., Osaka, Japan). The IEMs were either CEMs (CSE; Astom Co., Ltd., Tokyo, Japan) or AEMs (ASE; Astom Co., Ltd.).…”

Section: Mfc Used In the Experimentsmentioning

confidence: 99%

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Effect of Ion Selectivity on Current Production in Sewage Microbial Fuel Cell Separators

et al. 2022

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This study compared the performance of two microbial fuel cells (MFCs) equipped with separators of anion or cation exchange membranes (AEMs or CEMs) for sewage wastewater treatment. Under chemostat feeding of sewage wastewater (hydraulic retention time of approximately 7 h and polarization via an external resistance of 1 Ω), the MFCs with AEM (MFCAEM) generated a maximum current that was 4–5 times greater than that generated by the MFC with CEM (MFCCEM). The high current in the MFCAEM was attributed to the approximately neutral pH of its cathode, in contrast to the extremely high pH of the MFCCEM cathode. Due to the elimination of the pH imbalance, the cathode resistance for the MFCAEM (13–19 Ω·m2) was lower than that for the MFCCEM (41–44 Ω·m2). The membrane resistance measured as the Cl- mobility of AEMs for the MFCAEM operated for 35, 583, and 768 days showed an increase with operation time and depth, and this increase contributed minimally to the cathode resistance of the MFCAEM. These results indicate the advantage of the AEM over the CEM for air-cathode MFCs. The membrane resistance may increase when the AEM is applied in large-scale MFCs on a meter scale for extended periods.

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Section: Polarization Curvesupporting

confidence: 54%

Section: Cod Removal and Cementioning

confidence: 46%

Section: Current Production By the Two Mfcs Throughout The Operationmentioning

confidence: 93%

Section: Mfc Used In the Experimentsmentioning

confidence: 99%

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Effect of Ion Selectivity on Current Production in Sewage Microbial Fuel Cell Separators

et al. 2022

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“…The CB anodes acclimated in the electrochemical culture were placed in a tubular air-core MFC equipped with a carbon cathode and an anion exchange membrane (Sugioka et al, 2019) (Yamane et al, 2021). The MFC used in this study was smaller than the ϕ5.0 7 cm set, with four CB pieces (Fig.…”

Section: Evaluation Of Current Recovery In Microbial Fuel Cellmentioning

confidence: 99%

Comparative evaluation of fibrous artificial carbons and bamboo charcoal in terms of recovery of current from sewage wastewater

Nagahashi

Yoshida

2021

J. Gen. Appl. Microbiol.

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In this study, two fibrous carbon anodes (namely (PNWG) and carbon brush (CB) made from artificial carbon) and bamboo charcoal (BC) were evaluated for current recovery from sewage wastewater. When these anodes were polarized at 0.2 V vs. Ag/AgCl in sewage wastewater, CB produced a maximum current of 2.9 1.5 1.4 A/m 2 . This exceeded that produced by PNWG ( A/m 2 ) and BC ( A/m 2 ). The CB was superior to those achieved with the accumulative charge recovery achieved with other two 1.6-2.2-NWG BC ( and fold higher than that with P and , respectively). During the cyclic voltammetry analysis, CB demonstrated the highest catalytic current with maximum -0.6 0.4 potential in the range of to V vs. Ag/AgCl and the smallest anode resistance (0.20 Ω that the fibrous anodes (CB and PNWG) m 2 ). Direct cell counting revealed attached most the anodes (80%), whereas BC the proportion of of the cells in did not. In contrast,Geobacter species, a representative electrogenic microorganism in the total bacteria, was similar among the three anodes (4.4-5.8%). The observed to be tubular microbial fuel cell (ϕ 5.0 cm core wrapped with an anion exchange ) equipped with an air-chamber membrane A/ 2 . This is higher than those reported in the (AEM) and the CB delivered a current of 1.8 m existing literature for the same microbial fuel cell (MFC) configuration. This indicates that the anode from planar the current the alteration of to brush can contribute toward improving recovery The BC needs improvement to have more through the air-cathode-AEM-MFC. specific surface area, whereas it showed superiority in cost efficiency considering material and processing.

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Next‐Generation Proton‐Exchange Membranes in Microbial Fuel Cells: Overcoming Nafion's Limitations

Sharma,

Đelević,

Herkendell

2024

Energy Tech

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The adoption of microbial fuel cell (MFC) technology hinges on the development of efficient proton‐exchange membranes (PEMs), which significantly influences fuel cell performance and cost. PEMs have a critical role in preventing oxygen crossover, maintaining electrochemical neutrality, and supporting microorganisms within MFCs. Nafion, the current industry‐standard PEM, grapples with environmental, cost, and performance issues. Although improvements to Nafion have been reported using additives, immersion in heteropolyacids, different pretreatment methods, and UV irradiation, many of the challenges still remain. Herein, the recent developments in the area of alternative PEMs are reviewed and analyzed. Among them, sulfonated aromatic hydrocarbons, particularly sulfonated polyether ether ketone, have emerged as top contenders in terms of scale up and commercial viability. At the same time, membranes based on polyvinyl alcohol, ionic liquids, and natural materials are also being actively researched for various MFC applications. Since most studies are short term and lab scale, there is a need evaluate long‐term stability and economic cost of PEMs in terms of standardized parameters such as power‐to‐cost and normalized energy recovery. Additionally, for emerging low‐energy‐density MFC applications like biosensors and in vivo power sources, PEM properties and design need to be tailored carefully.

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Estimation of total energy requirement for sewage treatment by a microbial fuel cell with a one-meter air-cathode assuming Michaelis–Menten COD degradation

Abstract: Calculations of chemical oxygen demand (COD) degradation in sewage by a microbial fuel cell (MFC) were used to estimate the total energy required for treatment of the sewage.

Cited by 21 publications

References 66 publications

Effect of Ion Selectivity on Current Production in Sewage Microbial Fuel Cell Separators

Effect of Ion Selectivity on Current Production in Sewage Microbial Fuel Cell Separators

Comparative evaluation of fibrous artificial carbons and bamboo charcoal in terms of recovery of current from sewage wastewater

Next‐Generation Proton‐Exchange Membranes in Microbial Fuel Cells: Overcoming Nafion's Limitations

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