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首页> 外文期刊>RSC Advances >Composition and role of the attached and planktonic microbial communities in mesophilic and thermophilic xylose-fed microbial fuel cells
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Composition and role of the attached and planktonic microbial communities in mesophilic and thermophilic xylose-fed microbial fuel cells

机译：嗜温和嗜热木糖喂养的微生物燃料电池中附着和浮游微生物群落的组成和作用

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摘要

A mesophilic (37 °C) and a thermophilic (55 °C) two-chamber microbial fuel cell (MFC) were studied and compared for their power production from xylose and the microbial communities involved. The anode-attached, membrane-attached, and planktonic microbial communities, and their respective active subpopulations, were determined by next generation sequencing (Illumina MiSeq), based on the presence and expression of the 16S rRNA gene. Geobacteraceae accounted for 65% of the anode-attached active microbial community in the mesophilic MFC, and were associated to electricity generation likely through direct electron transfer, resulting in the highest power production of 1.1 W m?3. A lower maximum power was generated in the thermophilic MFC (0.2 W m?3), likely due to limited acetate oxidation and the competition for electrons by hydrogen oxidizing bacteria and hydrogenotrophic methanogenic archaea. Aerobic microorganisms, detected among the membrane-attached active community in both the mesophilic and thermophilic MFC, likely acted as a barrier for oxygen flowing from the cathodic chamber through the membrane, favoring the strictly anaerobic exoelectrogenic microorganisms, but competing with them for xylose and its degradation products. This study provides novel information on the active microbial communities populating the anodic chamber of mesophilic and thermophilic xylose-fed MFCs, which may help in developing strategies to favor exoelectrogenic microorganisms at the expenses of competing microorganisms.
机译：研究了嗜温（37°C）和嗜热（55°C）两室微生物燃料电池（MFC），并比较了它们从木糖和所涉及的微生物群落中产生的功率。基于16S rRNA基因的存在和表达，通过下一代测序（Illumina MiSeq）确定了阳极附着，膜附着和浮游微生物群落及其各自的活性亚群。 土杆菌科在嗜温MFC中占阳极附着的活性微生物群落的65％，并可能通过直接电子转移与发电相关，导致最高发电量为1.1 W m ？3 。嗜热MFC中产生的最大功率较低（0.2 W m ？3 ），这可能是由于乙酸盐氧化作用受限以及氢氧化细菌和氢营养型产甲烷菌对电子的竞争古细菌。在嗜温和嗜热MFC的与膜相连的活性群落中检测到的好氧微生物，可能会成为氧气从阴极室流经膜的屏障，有利于严格厌氧的外生电微生物，但会与它们竞争木糖及其降解产物。这项研究提供了有关嗜温和嗜热木糖喂养的MFCs的阳极室中活跃的微生物群落的新信息，这可能有助于制定策略，有利于以放生微生物为代价的放生电微生物。

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