Limits...
An Evaluation of the Performance and Economics of Membranes and Separators in Single Chamber Microbial Fuel Cells Treating Domestic Wastewater.

Christgen B, Scott K, Dolfing J, Head IM, Curtis TP - PLoS ONE (2015)

Bottom Line: Peak power densities during polarisation, from MFCs using no-membrane, Nafion and ETFE, reached 67, 61 and 59 mWm(-2), and coulombic efficiencies of 68±11%, 71±12% and 92±6%, respectively.Under 1000 Ω, Nafion and ETFE achieved an average power density of 29 mWm(-2) compared to 24 mWm(-2) for the membrane-less reactors.Over a hypothetical lifetime of 10 years the generated energy (1 to 2.5 kWhm(-2)) would not be sufficient to offset the costs of any membrane and separator tested.

View Article: PubMed Central - PubMed

Affiliation: School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom.

ABSTRACT
The cost of materials is one of the biggest barriers for wastewater driven microbial fuel cells (MFCs). Many studies use expensive materials with idealistic wastes. Realistically the choice of an ion selective membrane or nonspecific separators must be made in the context of the cost and performance of materials available. Fourteen membranes and separators were characterized for durability, oxygen diffusion and ionic resistance to enable informed membrane selection for reactor tests. Subsequently MFCs were operated in a cost efficient reactor design using Nafion, ethylene tetrafluoroethylene (ETFE) or polyvinylidene fluoride (PVDF) membranes, a nonspecific separator (Rhinohide), and a no-membrane design with a carbon-paper internal gas diffusion cathode. Peak power densities during polarisation, from MFCs using no-membrane, Nafion and ETFE, reached 67, 61 and 59 mWm(-2), and coulombic efficiencies of 68±11%, 71±12% and 92±6%, respectively. Under 1000 Ω, Nafion and ETFE achieved an average power density of 29 mWm(-2) compared to 24 mWm(-2) for the membrane-less reactors. Over a hypothetical lifetime of 10 years the generated energy (1 to 2.5 kWhm(-2)) would not be sufficient to offset the costs of any membrane and separator tested.

No MeSH data available.


COD removal, coulombic efficiency and current density in wastewater fed MFCs equipped with different membranes.The current density was measured at the end of the batch under 1kΩ external load.
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pone.0136108.g004: COD removal, coulombic efficiency and current density in wastewater fed MFCs equipped with different membranes.The current density was measured at the end of the batch under 1kΩ external load.

Mentions: Reactors using ETFE and Nafion membranes achieved the highest steady state power densities with 29±3.4 mW m-2 (at 152±8.8 mA m-2 and 190±11 mV) and 29±2.6 mW m-2 (at 152±6.7 mA m-2 and 190±8 mV) respectively under 1kΩ load. The power density in reactors using no membrane reached 24±0.02 mW m-2 (at 138±0.07 mA m-2 and 172±0.09 mV) and reactors using Rhinohide separators achieved power densities of 14±2.2 mW m-2 (Fig 4). The worst performing reactors reaching power densities of 11±0.5 mW m-2 used PVDF membranes. The different membrane materials had a significant effect on the cell voltage (p = 0.008), power density (p = 0.010) and current density (p = 0.010). The duplicates were statistically indistinguishable.


An Evaluation of the Performance and Economics of Membranes and Separators in Single Chamber Microbial Fuel Cells Treating Domestic Wastewater.

Christgen B, Scott K, Dolfing J, Head IM, Curtis TP - PLoS ONE (2015)

COD removal, coulombic efficiency and current density in wastewater fed MFCs equipped with different membranes.The current density was measured at the end of the batch under 1kΩ external load.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4548946&req=5

pone.0136108.g004: COD removal, coulombic efficiency and current density in wastewater fed MFCs equipped with different membranes.The current density was measured at the end of the batch under 1kΩ external load.
Mentions: Reactors using ETFE and Nafion membranes achieved the highest steady state power densities with 29±3.4 mW m-2 (at 152±8.8 mA m-2 and 190±11 mV) and 29±2.6 mW m-2 (at 152±6.7 mA m-2 and 190±8 mV) respectively under 1kΩ load. The power density in reactors using no membrane reached 24±0.02 mW m-2 (at 138±0.07 mA m-2 and 172±0.09 mV) and reactors using Rhinohide separators achieved power densities of 14±2.2 mW m-2 (Fig 4). The worst performing reactors reaching power densities of 11±0.5 mW m-2 used PVDF membranes. The different membrane materials had a significant effect on the cell voltage (p = 0.008), power density (p = 0.010) and current density (p = 0.010). The duplicates were statistically indistinguishable.

Bottom Line: Peak power densities during polarisation, from MFCs using no-membrane, Nafion and ETFE, reached 67, 61 and 59 mWm(-2), and coulombic efficiencies of 68±11%, 71±12% and 92±6%, respectively.Under 1000 Ω, Nafion and ETFE achieved an average power density of 29 mWm(-2) compared to 24 mWm(-2) for the membrane-less reactors.Over a hypothetical lifetime of 10 years the generated energy (1 to 2.5 kWhm(-2)) would not be sufficient to offset the costs of any membrane and separator tested.

View Article: PubMed Central - PubMed

Affiliation: School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom.

ABSTRACT
The cost of materials is one of the biggest barriers for wastewater driven microbial fuel cells (MFCs). Many studies use expensive materials with idealistic wastes. Realistically the choice of an ion selective membrane or nonspecific separators must be made in the context of the cost and performance of materials available. Fourteen membranes and separators were characterized for durability, oxygen diffusion and ionic resistance to enable informed membrane selection for reactor tests. Subsequently MFCs were operated in a cost efficient reactor design using Nafion, ethylene tetrafluoroethylene (ETFE) or polyvinylidene fluoride (PVDF) membranes, a nonspecific separator (Rhinohide), and a no-membrane design with a carbon-paper internal gas diffusion cathode. Peak power densities during polarisation, from MFCs using no-membrane, Nafion and ETFE, reached 67, 61 and 59 mWm(-2), and coulombic efficiencies of 68±11%, 71±12% and 92±6%, respectively. Under 1000 Ω, Nafion and ETFE achieved an average power density of 29 mWm(-2) compared to 24 mWm(-2) for the membrane-less reactors. Over a hypothetical lifetime of 10 years the generated energy (1 to 2.5 kWhm(-2)) would not be sufficient to offset the costs of any membrane and separator tested.

No MeSH data available.