Electro-extractive fermentation for efficient biohydrogen production
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- 作者：Mark D. Redwood ; m.d.redwood@bham.ac.uk ; Rafael L. Orozco ; Artur J. Majewski ; Lynne E. Macaskie
- 关键词：Fermentation ; Biohydrogen ; Electrodialysis ; Escherichia coli ; Organic acid
- 刊名：Bioresource Technology
- 出版年：2012
- 出版时间：March 2012
- 年：2012
- 卷：107
- 期：Complete
- 页码：166-174
- 全文大小：711 K
文摘
Electrodialysis, an electrochemical membrane technique, was found to prolong and enhance the production of biohydrogen and purified organic acids via the anaerobic fermentation of glucose by Escherichia coli. Through the design of a model electrodialysis medium using cationic buffer, pH was precisely controlled electrokinetically, i.e. by the regulated extraction of acidic products with coulombic efficiencies of organic acid recovery in the range 50-70 % maintained over continuous 30-day experiments. Contrary to previous reports, E. coli produced H2 after aerobic growth in minimal medium without inducers and with a mixture of organic acids dominated by butyrate. The selective separation of organic acids from fermentation provides a potential nitrogen-free carbon source for further biohydrogen production in a parallel photofermentation. A parallel study incorporated this fermentation system into an integrated biohydrogen refinery (IBR) for the conversion of organic waste to hydrogen and energy.