Effects of flow-rate, inoculum and time on the internal resistance of microbial fuel cells
Effects of flow-rate, inoculum and time on the internal resistance of microbial fuel cells
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DOI：
10.1016/j.biortech.2009.12.108
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发表时间：
2010-05-01
影响因子：
11.4
通讯作者：
Greenman, John
中科院分区：
文献类型：
--
作者：
Ieropoulos, Ioannis;Winfield, Jonathan;Greenman, John
为了处理大量废水，微生物燃料电池（mfc）需要在高流速下运行的嗜氧细菌。在厌氧生物膜发育过程中，采用培养好氧/兼性菌或厌氧菌的接种剂，研究了流速对不同微生物群落的影响。在早期阶段，所有mfc在高流速下表现不佳，然而，好氧型-随着阳极生物膜的发展-随后表现出更显著的改善。扫描电镜显示生物膜形成的一些变化，其中块状生长与较低的功率有关。随着时间的推移，低流速的功率和内阻都增加了，这可能是由于微生物群的进化导致氧化还原电位的改变。在功率曲线上观察到一个超调，这是由于离子耗尽和/或微生物耗尽引起的内阻增加。据作者所知，这是第一次从内阻的角度来解释这种现象。(c) 2010 Elsevier Ltd.版权所有。
To process large volumes of wastewater, microbial fuel cells (MFCs) would require anodophilic bacteria preferably operating at high flow-rates. The effect of flow-rate on different microbial consortia was examined during anodic biofilm development, using inocula designed to enrich either aerobes/facultative species or anaerobes. All MFCs underperformed at high flow-rates in the early stages, however, the aerobic type - following anodic biofilm development - subsequently exhibited more marked improvement. Scanning electron microscopy showed some variation in biofilm formation where clumpy growth was associated with lower power. Over time both power and internal resistance increased for the low flow-rates perhaps explained by an evolving microflora that consequently changed redox potential. An overshoot was observed in power curves, which was attributed to increased internal resistance due to ionic depletion and/or microbial exhaustion. To the best of the authors' knowledge this is the first time that such phenomena are explained from the internal resistance perspective. (c) 2010 Elsevier Ltd. All rights reserved.