Tampere University, Faculty of Engineering and Natural Sciences, P.O. Box 541, FI-33104 Tampere University, Finland; National University of Ireland Galway, University Road, Galway H91 TK33, Ireland.
Tampere University, Faculty of Engineering and Natural Sciences, P.O. Box 541, FI-33104 Tampere University, Finland; Department of Civil Engineering, Indian Institute of Technology Hyderabad, India.
Bioresour Technol. 2019 Dec;294:122115. doi: 10.1016/j.biortech.2019.122115. Epub 2019 Sep 5.
The microbial communities developed from a mixed-species culture in up-flow and flow-through configurations of thermophilic (55 °C) microbial fuel cells (MFCs), and their power production from acetate, were investigated. The up-flow MFC was operated for 202 days, obtaining an average power density of 0.13 W/m, and Tepidiphilus was the dominant transcriptionally-active microorganisms. The planktonic community developed in the up-flow MFC was used to inoculate a flow-through MFC resulting in the proliferation of Ureibacillus, whose relative abundance increased from 1 to 61% after 45 days. Despite the differences between the up-flow and flow-through MFCs, including the anode electrode, hydrodynamic conditions, and the predominant microorganism, similar (p = 0.05) volumetric power (0.11-0.13 W/m), coulombic efficiency (16-18%) and acetate consumption rates (55-69 mg/L/d) were obtained from both. This suggests that though MFC design can shape the active component of the thermophilic microbial community, the consortia are resilient and can maintain similar performance in different MFC configurations.
本研究考察了在嗜热（55°C）微生物燃料电池（MFC）的上流和流动两种构型中，由混合物种培养物形成的微生物群落及其对乙酸盐的发电能力。上流 MFC 运行了 202 天，获得了 0.13 W/m 的平均功率密度，并且转录活性最强的微生物是 Tepidiphilus。在上流 MFC 中形成的浮游生物群落被用于接种流动 MFC，导致 Ureibacillus 大量繁殖，其相对丰度在 45 天后从 1%增加到 61%。尽管上流和流动 MFC 之间存在差异，包括阳极电极、水动力条件和主要微生物，但两者的体积功率（0.11-0.13 W/m）、库仑效率（16-18%）和乙酸盐消耗率（55-69 mg/L/d）相似（p=0.05）。这表明，尽管 MFC 设计可以塑造嗜热微生物群落的活性成分，但菌群具有弹性，可以在不同的 MFC 构型中保持相似的性能。
