A Single-Chamber Microbial Fuel Cell without an Air Cathode
| Autor: | Min-Jen Tseng, Kai Chien Cheng, Chien-Cheng Chen, Young-Fo Chang, Vanita Roshan Nimje, Ruey-Chyuan Shih, Chien-Yen Chen, Hau-Ren Chen |
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| Rok vydání: | 2012 |
| Předmět: |
microbial fuel cells
Microbial fuel cell Bioelectric Energy Sources Inorganic chemistry microbial growth Biomass Wastewater Article Catalysis Water Purification lcsh:Chemistry Inorganic Chemistry chemistry.chemical_compound Electricity Waste Management Nitrate Physical and Theoretical Chemistry lcsh:QH301-705.5 Electrodes Molecular Biology Spectroscopy air cathode chemistry.chemical_classification Nitrates Chemistry Organic Chemistry General Medicine cyclic voltammograms Electron acceptor nitrate reduction Computer Science Applications aerobic Glucose lcsh:Biology (General) lcsh:QD1-999 Bacillus subtilis glucose fermentation Biochemistry Fermentation Sewage treatment Energy source Faraday efficiency |
| Zdroj: | International Journal of Molecular Sciences International Journal of Molecular Sciences; Volume 13; Issue 3; Pages: 3933-3948 International Journal of Molecular Sciences, Vol 13, Iss 3, Pp 3933-3948 (2012) |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms13033933 |
| Popis: | Microbial fuel cells (MFCs) represent a novel technology for wastewater treatment with electricity production. Electricity generation with simultaneous nitrate reduction in a single-chamber MFC without air cathode was studied, using glucose (1 mM) as the carbon source and nitrate (1 mM) as the final electron acceptor employed by Bacillus subtilis under anaerobic conditions. Increasing current as a function of decreased nitrate concentration and an increase in biomass were observed with a maximum current of 0.4 mA obtained at an external resistance (R(ext)) of 1 KΩ without a platinum catalyst of air cathode. A decreased current with complete nitrate reduction, with further recovery of the current immediately after nitrate addition, indicated the dependence of B. subtilis on nitrate as an electron acceptor to efficiently produce electricity. A power density of 0.0019 mW/cm(2) was achieved at an R(ext) of 220 Ω. Cyclic voltammograms (CV) showed direct electron transfer with the involvement of mediators in the MFC. The low coulombic efficiency (CE) of 11% was mainly attributed to glucose fermentation. These results demonstrated that electricity generation is possible from wastewater containing nitrate, and this represents an alternative technology for the cost-effective and environmentally benign treatment of wastewater. |
| Databáze: | OpenAIRE |
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