Assessment of Microbial Fuel Cell Configurations and Power Densities

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• 作者：Bruce E. Logan ; Maxwell J. Wallack ; Kyoung-Yeol Kim ; Weihua He ; Yujie Feng ; Pascal E. Saikaly
• 刊名：Environmental Science & Technology Letters
• 出版年：2015
• 出版时间：August 11, 2015
• 年：2015
• 卷：2
• 期：8
• 页码：206-214
• 全文大小：464K

文摘

Different microbial electrochemical technologies are being developed for many diverse applications, including wastewater treatment, biofuel production, water desalination, remote power sources, and biosensors. Current and energy densities will always be limited relative to batteries and chemical fuel cells, but these technologies have other advantages based on the self-sustaining nature of the microorganisms that can donate or accept electrons from an electrode, the range of fuels that can be used, and versatility in the chemicals that can be produced. The high cost of membranes will likely limit applications of microbial electrochemical technologies that might require a membrane. For microbial fuel cells, which do not need a membrane, questions about whether larger-scale systems can produce power densities similar to those obtained in laboratory-scale systems remain. It is shown here that configuration and fuel (pure chemicals in laboratory media vs actual wastewaters) remain the key factors in power production, rather than the scale of the application. Systems must be scaled up through careful consideration of electrode spacing and packing per unit volume of the reactor.