Improved performance of microbial fuel cell using combination biocathode of graphite fiber brush and graphite granules

Zhang, Guo Dong; Zhao, Qingliang; Jiao, Yan; Zhang, Jin Na; Jiang, Junqiu; Ren, Nanqi; Kim, Byung Hong

doi:10.1016/j.jpowsour.2011.03.096

Cited by 81 publications

(30 citation statements)

References 34 publications

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“…Since this approach is predicated on use of both an upper aqueous phase and a lower semisolid or granular phase, it is likely not limited to use with sediments. Indeed, biocathodes have been shown to develop well in beds of activated carbon and graphite when aided with carbon brushes (41,46). Future studies are planned to explore if this strategy can function as a general method to enrich an exoelectrogenic-electrotrophic community and, when the electrodes are inverted, whether only the autotropic-electrotrophic community can thrive.…”

Section: Discussionmentioning

confidence: 99%

Enrichment of Microbial Electrolysis Cell Biocathodes from Sediment Microbial Fuel Cell Bioanodes

Pisciotta

Zaybak

Call

et al. 2012

Appl Environ Microbiol

174

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Electron-accepting (electrotrophic) biocathodes were produced by first enriching graphite fiber brush electrodes as the anodes in sediment-type microbial fuel cells (sMFCs) using two different marine sediments and then electrically inverting the anodes to function as cathodes in two-chamber bioelectrochemical systems (BESs). Electron consumption occurred at set potentials of ؊439 mV and ؊539 mV (versus the potential of a standard hydrogen electrode) but not at ؊339 mV in minimal media lacking organic sources of energy. Results at these different potentials were consistent with separate linear sweep voltammetry (LSV) scans that indicated enhanced activity (current consumption) below only ca. ؊400 mV. MFC bioanodes not originally acclimated at a set potential produced electron-accepting (electrotrophic) biocathodes, but bioanodes operated at a set potential (؉11 mV) did not. CO 2 was removed from cathode headspace, indicating that the electrotrophic biocathodes were autotrophic. Hydrogen gas generation, followed by loss of hydrogen gas and methane production in one sample, suggested hydrogenotrophic methanogenesis. There was abundant microbial growth in the biocathode chamber, as evidenced by an increase in turbidity and the presence of microorganisms on the cathode surface. Clone library analysis of 16S rRNA genes indicated prominent sequences most similar to those of Eubacterium limosum (Butyribacterium methylotrophicum), Desulfovibrio sp. A2, Rhodococcus opacus, and Gemmata obscuriglobus. Transfer of the suspension to sterile cathodes made of graphite plates, carbon rods, or carbon brushes in new BESs resulted in enhanced current after 4 days, demonstrating growth by these microbial communities on a variety of cathode substrates. This report provides a simple and effective method for enriching autotrophic electrotrophs by the use of sMFCs without the need for set potentials, followed by the use of potentials more negative than ؊400 mV.

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Section: Discussionmentioning

confidence: 99%

Enrichment of Microbial Electrolysis Cell Biocathodes from Sediment Microbial Fuel Cell Bioanodes

Pisciotta

Zaybak

Call

et al. 2012

Appl Environ Microbiol

174

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“…The average voltage was calculated every 24 h. Current (I), power (P = IV) and polarization curves were calculated and obtained according to the previous description (Logan et al 2006). Internal resistance (R int ) was determined by the slope of polarization curve (Cheng et al 2005;Zhang et al 2011). The volumetric power density was normalized by net anodic compartment (NAC).…”

Section: Analyses and Computationsmentioning

confidence: 99%

Bioelectricity generation and dewatered sludge degradation in microbial capacitive desalination cell

Meng

Zhao

Feng

et al. 2016

Environ Sci Pollut Res

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Microbial desalination cell (MDC) is a new approach for the synergy in bioelectricity generation, desalination and organic waste treatment without additional power input. However, current MDC systems cause salt accumulation in anodic wastewater and sludge. A microbial capacitive desalination cell (MCDC) with dewatered sludge as anodic substrate was developed to address the salt migration problem and improve the sludge recycling value by special designed-membrane assemblies, which consisted of cation exchange membranes (CEMs), layers of activated carbon cloth (ACC), and nickel foam. Experimental results indicated that the maximum power output of 2.06 W/m with open circuit voltage (OCV) of 0.942 V was produced in 42 days. When initial NaCl concentration was 2 g/L, the desalinization rate was about 15.5 mg/(L·h) in the first 24 h, indicating that the MCDC reactor was suitable to desalinize the low concentration salt solution rapidly. The conductivity of the anodic substrate decreased during the 42-day operation; the CEM/ACC/Ni assemblies could effectively restrict the salt accumulation in MCDC anode and promote dewatered sludge effective use by optimizing the dewatered sludge properties, such as organic matter, C/N, pH value, and electric conductivity (EC).

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“…Three-dimensional biocathode materials with large specific area such as carbon brush and graphite granules could increase the amount of biomass and finally increase the performance of wastewater treatment (Zhang et al, 2011b). Moreover, metal current collector is constantly being introduced into the electrode design to reduce the system internal impedance due to the good conductivity .…”

Section: Potential and Challengementioning

confidence: 99%

Improved 4-chlorophenol dechlorination at biocathode in bioelectrochemical system using optimized modular cathode design with composite stainless steel and carbon-based materials

Kong

Wang

Ren

2014

Bioresource Technology

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h i g h l i g h t sA modular biocathode materials design was developed and optimized in BES. Dechlorination was improved using this composite metal and carbon-based material. SSB/GG/CB was optimum for dechlorination, followed by SSB/CB and SSB/GG. EIS analysis showed that the composite materials could improve the charge transfer. This modular design could be scalable with successive modules for BES scale-up. t r a c tThis study developed and optimized a modular biocathode materials design in bioelectrochemical system (BES) using composite metal and carbon-based materials. The 4-chlorophenol (4-CP) dechlorination could be improved with such composite materials. Results showed that stainless steel basket (SSB) filled with graphite granules (GG) and carbon brush (CB) (SSB/GG/CB) was optimum for dechlorination, followed by SSB/CB and SSB/GG, with rate constant k of 0.0418 ± 0.0002, 0.0374 ± 0.0004, and 0.0239 ± 0.0002 h À1 , respectively. Electrochemical impedance spectroscopy (EIS) demonstrated that the composite materials with metal can benefit the electron transfer and decrease the charge transfer resistance to be 80.4 X in BES-SSB/GG/CB, much lower than that in BES-SSB (1674.3 X), BES-GG (387.3 X), and BES-CB (193.8 X). This modular cathode design would be scalable with successive modules for BES scaleup, and may offer useful information to guide the selection and design of BES materials towards dechlorination improvement in wastewater treatment.

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Improved performance of microbial fuel cell using combination biocathode of graphite fiber brush and graphite granules

Cited by 81 publications

References 34 publications

Enrichment of Microbial Electrolysis Cell Biocathodes from Sediment Microbial Fuel Cell Bioanodes

Enrichment of Microbial Electrolysis Cell Biocathodes from Sediment Microbial Fuel Cell Bioanodes

Bioelectricity generation and dewatered sludge degradation in microbial capacitive desalination cell

Improved 4-chlorophenol dechlorination at biocathode in bioelectrochemical system using optimized modular cathode design with composite stainless steel and carbon-based materials

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