Syntrophic Processes Drive the Conversion of Glucose in Microbial Fuel Cell Anodes
Syntrophic Processes Drive the Conversion of Glucose in Microbial Fuel Cell Anodes
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DOI：
10.1021/es800482e
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发表时间：
2008-11-01
影响因子：
11.4
通讯作者：
Keller, Juerg
中科院分区：
文献类型：
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作者：
Freguia, Stefano;Rabaey, Korneel;Keller, Juerg
微生物燃料电池（MFC）阳极是一种厌氧生物反应器。发酵和产甲烷等过程可能是发电的竞争对手。本文研究了具有适应菌群的连续微生物燃料电池阳极中葡萄糖转化的途径。研究表明，大部分葡萄糖首先发酵成氢和乙酸。然后两者都被用作细菌发电的底物。当产甲烷菌存在时，甲烷产生的速率会随着当前的产甲烷和发电对氢气的竞争而略有增加，从而导致发酵速率的增加。在颗粒石墨上相当年轻的阳极生物膜中，通过向阳极室曝气一小时可以抑制产甲烷。在颗粒石墨上建立良好的生物膜上应用相同的技术只能实现短期抑制。该研究表明，发酵过程对当前的生成没有危害，并且葡萄糖的直接氧化在MFC阳极的混合种群转化中不起主要作用。
Microbial fuel cell (MFC) anodes are anaerobic bioreactors. Processes such as fermentations and methanogenesis are likely competitors to electricity generation. This work studied the pathway of glucose conversion in continuous microbial fuel cell anodes with an adapted bacterial community. The study revealed that the majority of glucose is first fermented to hydrogen and acetate. Both are then used as substrates for bacterial electricity generation. When methanogens are present, methane production occurs at a rate that slightly increases with the current Methanogenesis and electricity generation compete for hydrogen, causing increased fermentation rates. In a rather young anodic biofilm on granular graphite, methanogenesis can be suppressed by aerating the anode compartment for one hour. Only short-term inhibition can be achieved applying the same technique on a well established biofilm on granular graphite. This study shows that fermentative processes are not detrimental to current generation, and that direct oxidation of glucose does not play a major role in mixed population conversions in a MFC anode.