Department of Civil and Environmental Engineering, H(2)E Center, 131 Sackett Building, The Pennsylvannia State University, University Park, PA 16802, USA.
Bioresour Technol. 2011 Jan;102(1):388-94. doi: 10.1016/j.biortech.2010.05.019.
Conditions in microbial fuel cells (MFCs) differ from those in microbial electrolysis cells (MECs) due to the intrusion of oxygen through the cathode and the release of H(2) gas into solution. Based on 16S rRNA gene clone libraries, anode communities in reactors fed acetic acid decreased in species richness and diversity, and increased in numbers of Geobacter sulfurreducens, when reactors were shifted from MFCs to MECs. With a complex source of organic matter (potato wastewater), the proportion of Geobacteraceae remained constant when MFCs were converted into MECs, but the percentage of clones belonging to G. sulfurreducens decreased and the percentage of G. metallireducens clones increased. A dairy manure wastewater-fed MFC produced little power, and had more diverse microbial communities, but did not generate current in an MEC. These results show changes in Geobacter species in response to the MEC environment and that higher species diversity is not correlated with current.
由于氧气通过阴极渗透以及氢气释放到溶液中，微生物燃料电池（MFC）中的条件与微生物电解池（MEC）中的条件不同。基于 16S rRNA 基因克隆文库，当从 MFC 切换到 MEC 时，以乙酸为食的反应器中的阳极群落的物种丰富度和多样性降低，而脱硫弧菌的数量增加。对于复杂的有机物来源（马铃薯废水），当将 MFC 转换为 MEC 时，Geobacteraceae 的比例保持不变，但属于脱硫弧菌的克隆百分比下降，而 G. metallireducens 克隆的百分比增加。以奶牛粪便废水为食的 MFC 产生的电量很少，微生物群落的多样性更高，但在 MEC 中不能产生电流。这些结果表明，Geobacter 物种会响应 MEC 环境而发生变化，并且较高的物种多样性与电流无关。
