Enhancement of coulombic efficiency and salt tolerance in microbial fuel cells by graphite/alginate granules immobilization of Shewanella oneidensis MR-1 |
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| Authors: | Yang-Chun Yong Zhi-Hong Liao Jian-Zhong Sun Tao Zheng Rong-Rong Jiang Hao Song |
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| Institution: | 1. Biofuels Institute, School of the Environment, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu Province, China;2. College of Biotechnology & Pharmaceutical Engineering, Nanjing University of Technology, No. 5 Xin Mofan Road, Nanjing 210009, China;3. School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore;4. Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, 60 Nanyang Drive, SBS-01n-27, Singapore 637551, Singapore;5. Key Laboratory of Systems Bioengineering, Ministry of Education, and School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China |
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| Abstract: | Coulombic efficiency and stability of electricity output are crucial for practical applications of microbial fuel cells (MFCs). In this study, a cell immobilization method for electrogenic microorganism in MFCs using graphite/alginate granules is developed. The MFC with immobilized cell granules delivered a much more stable electricity output than that with suspension cells, and resulted in a ～0.8 to 1.7 times improvement on coulombic efficiency compared to the suspension mode. Impressively, with the conductive graphite/alginate/cells granules, the internal resistance of the MFC decreased dramatically. Moreover, the cell immobilized MFC showed a much higher tolerance to the shock of high salt concentration than the MFC with suspension cells. The results substantiated that immobilization of electrogenic microorganism for MFCs could be achieved by the method developed here, and it is promising for practical application in energy harvesting from wastewater by MFCs. |
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| Keywords: | Microbial fuel cells Coulombic efficiency Bioelectricity Immobilization Alginate |
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