Bristol Robotics Laboratory, University of the West of England, Bristol Business Park, Coldharbour Lane, Bristol BS16 1QD, United Kingdom.
Bioresour Technol. 2010 May;101(10):3520-5. doi: 10.1016/j.biortech.2009.12.108. Epub 2010 Jan 25.
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.
为了处理大量废水，微生物燃料电池 (MFC) 最好需要能够在高流速下运行的嗜阳极细菌。在阳极生物膜形成过程中，使用旨在富集好氧菌/兼性菌或厌氧菌的接种物，考察了流速对不同微生物群落的影响。所有 MFC 在高流速的早期阶段表现不佳，然而，好氧型在阳极生物膜形成后随后表现出更为显著的改善。扫描电子显微镜显示生物膜形成存在一些差异，其中团块状生长与较低的功率有关。随着时间的推移，低流速下的功率和内阻都有所增加，这可能是由于不断演变的微生物群落导致氧化还原电位发生变化。在功率曲线上观察到了一个过冲现象，这归因于由于离子耗尽和/或微生物枯竭导致的内阻增加。据作者所知，这是首次从内阻角度来解释这些现象。
