无介体微生物燃料电池阳极生物膜传质分析  

Mass transfer analysis for anode biofilm of mediator-less microbial fuel cell

作　　者：李俊[1] 沈磊[1] 叶丁丁[1] 朱恂[1] 廖强[1] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆大学工程热物理研究所,重庆400030

出　　处：《电源技术》2015年第5期934-937,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51176212);教育部新世纪人才资助计划(NCET-11-0551)

摘　　要：针对无介体微生物燃料电池阳极侧生物膜内的传递过程建立了一维稳态扩散传输模型,模型认为底物氧化产生的电子以直接方式传递至阳极,并考虑了生物膜内电势及pH的变化,计算获得了微生物燃料电池生物膜内的底物浓度、电势、电流密度以及pH值分布,讨论了生物膜的电导率、阳极电势和缓冲液浓度对生物膜内传质特性及产电性能的影响。计算结果表明随着生物膜电导率和阳极电势的增大,生物膜内底物浓度及pH值均降低,电池电流密度升高;进口缓冲液浓度越大,生物膜内pH值越高,有利于维持阳极生物膜内微生物的活性。The one-dimensional steady-state diffusion model was proposed focus on the mass transport in anode biofilm of mediator-less microbial fuel cell. In this model, electrons produced by the microbial oxidation of the substrate were assumed to be directly transferred to the anode, and the variations of local potential and pH inside the biofilm were also considered. The distributions of the substrate concentration, local potential, current density and pH value inside the biofilm of the microbial fuel cell were calculated. The effects of the biofilm conductivity, anode potential and buffer concentration on the mass transfer and cell performance were investigated. The results show that with the increase of biofilm conductivity and anode potential, the substrate concentration and pH value inside the biofilm decrease, while the current density increases. The high influent buffer concentration leads to the high pH value inside the biofUm, which is benefit to the maintenance of the activity of microorganisms in the anode biofilm.

关 键 词：微生物燃料电池 生物膜 传质 pH值 

分 类 号：TM911.4[电气工程—电力电子与电力传动]