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首页> 外文期刊>Applied Microbiology >Influence of External Resistance on Electrogenesis, Methanogenesis, and Anode Prokaryotic Communities in Microbial Fuel Cells
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Influence of External Resistance on Electrogenesis, Methanogenesis, and Anode Prokaryotic Communities in Microbial Fuel Cells

机译：外在电阻对微生物燃料电池中电生成，甲烷生成和阳极原核生物群落的影响

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The external resistance ( R _(ext)) of microbial fuel cells (MFCs) regulates both the anode availability as an electron acceptor and the electron flux through the circuit. We evaluated the effects of R _(ext) on MFCs using acetate or glucose. The average current densities ( I ) ranged from 40.5 mA/m~(2) (9,800 Ω) to 284.5 mA/m~(2) (150 Ω) for acetate-fed MFCs (acetate-fed reactors [ARs]), with a corresponding anode potential ( E _(an)) range of ?188 to ?4 mV (versus a standard hydrogen electrode [SHE]). For glucose-fed MFCs (glucose-fed reactors [GRs]), I ranged from 40.0 mA/m~(2) (9,800 Ω) to 273.0 mA/m~(2) (150 Ω), with a corresponding E _(an) range of ?189 to ?7 mV. ARs produced higher Coulombic efficiencies and energy efficiencies than GRs over all tested R _(ext) levels because of electron and potential losses from glucose fermentation. Biogas production accounted for 14 to 18% of electron flux in GRs but only 0 to 6% of that in ARs. GRs produced similar levels of methane, regardless of the R _(ext). However, total methane production in ARs increased as R _(ext) increased, suggesting that E _(an) might influence the competition for substrates between exoelectrogens and methanogens in ARs. An increase of R _(ext) to 9,800 Ω significantly changed the anode bacterial communities for both ARs and GRs, while operating at 970 Ω and 150 Ω had little effect. Deltaproteobacteria and Bacteroidetes were the major groups found in anode communities in ARs and GRs. Betaproteobacteria and Gammaproteobacteria were found only in ARs. Bacilli were abundant only in GRs. The anode-methanogenic communities were dominated by Methanosaetaceae , with significantly lower numbers of Methanomicrobiales . These results show that R _(ext) affects not only the E _(an) and current generation but also the anode biofilm community and methanogenesis.
机译：微生物燃料电池（MFCs）的外部电阻（R _（ext））既可调节作为电子受体的阳极利用率，也可调节通过电路的电子通量。我们使用乙酸盐或葡萄糖评估了R_（ext）对MFC的影响。醋酸盐喂养的MFC（醋酸盐喂养的反应器[ARs]）的平均电流密度（I）为40.5 mA / m〜（2）（9,800Ω）至284.5 mA / m〜（2）（150Ω），相应的阳极电势（E_（an））范围为188到4 mV（相对于标准氢电极[SHE]）。对于葡萄糖饲喂的MFC（葡萄糖饲喂的反应器[GRs]），I范围为40.0 mA / m〜（2）（9,800Ω）至273.0 mA / m〜（2）（150Ω），相应的E _（ an）范围为189至7 mV。在所有测试的R_（ext）水平上，ARs产生的库仑效率和能量效率均高于GRs，这是因为葡萄糖发酵产生的电子和潜在损失。沼气产量占GRs电子通量的14％至18％，但仅占ARs电子通量的0％至6％。无论R_（ext）如何，GR都会产生相似水平的甲烷。但是，AR中甲烷的总产量随R_（ext）的增加而增加，这表明E_（an）可能会影响ARs中放电子和产甲烷菌之间底物的竞争。 R _（ext）增加到9,800Ω显着改变了AR和GR的阳极细菌群落，而在970Ω和150Ω下运行几乎没有影响。变形杆菌和拟杆菌是在AR和GRs的阳极群落中发现的主要群体。仅在AR中发现了β-变形细菌和γ-变形细菌。芽孢杆菌仅在遗传资源中丰富。甲烷产甲烷菌科为阳极-甲烷生成群落，甲烷菌的数量明显减少。这些结果表明，R _（ext）不仅影响E _（an）和电流生成，而且还影响阳极生物膜群落和产甲烷作用。

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