Microbial electrolysis cells for production of methane from CO2: long-term performance and perspectives
- 6 December 2011
- journal article
- research article
- Published by Hindawi Limited in International Journal of Energy Research
- Vol. 36 (6), 809-819
- https://doi.org/10.1002/er.1954
Abstract
A methane-producing microbial electrolysis cell (MEC) is a technology to convert CO2 into methane, using electricity as an energy source and microorganisms as the catalyst. A methane-producing MEC provides the possibility to increase the fuel yield per hectare of land area, when the CO2 produced in biofuel production processes is converted to additional fuel methane. Besides increasing fuel yield per hectare of land area, this also results in more efficient use of land area, water, and nutrients. In this research, the performance of a methane-producing MEC was studied for 188 days in a flat-plate MEC design. Methane production rate and energy efficiency of the methane-producing MEC were investigated with time to elucidate the main bottlenecks limiting system performance. When using water as the electron donor at the anode during continuous operation, methane production rate was 0.006 m3/m3 per day at a cathode potential of −0.55 V vs. normal hydrogen electrode with a coulombic efficiency of 23.1%. External electrical energy input was 73.5 kWh/m3 methane, resulting in a voltage efficiency of 13.4%. Consequently, overall energy efficiency was 3.1%. The maximum achieved energy efficiency was obtained in a yield test and was 51.3%. Analysis of internal resistance showed that in the short term, cathode and anode losses were dominant, but with time, also pH gradient and transport losses became more important. The results obtained in this study are used to discuss the possible contribution of methane-producing MECs to increase the fuel yield per hectare of land area. Copyright © 2011 John Wiley & Sons, Ltd.Keywords
This publication has 29 references indexed in Scilit:
- A review on microalgae, a versatile source for sustainable energy and materialsInternational Journal of Energy Research, 2011
- Bioelectrochemical reduction of CO2 to CH4 via direct and indirect extracellular electron transfer by a hydrogenophilic methanogenic cultureBioresource Technology, 2010
- Bioelectrochemical Ethanol Production through Mediated Acetate Reduction by Mixed CulturesEnvironmental Science & Technology, 2009
- Biofuels: Environment, technology and food securityRenewable and Sustainable Energy Reviews, 2009
- Alcohol production through volatile fatty acids reduction with hydrogen as electron donor by mixed culturesWater Research, 2008
- Performance of non-porous graphite and titanium-based anodes in microbial fuel cellsElectrochimica Acta, 2008
- Green electricity production with living plants and bacteria in a fuel cellInternational Journal of Energy Research, 2008
- Land Clearing and the Biofuel Carbon DebtScience, 2008
- Biomass to biofuels, a chemical perspectiveGreen Chemistry, 2006
- Renewable energy and food supply: will there be enough land?Renewable and Sustainable Energy Reviews, 2005