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首页> 外文期刊>BMC Biotechnology >Characterization of anode and anolyte community growth and the impact of impedance in a microbial fuel cell
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Characterization of anode and anolyte community growth and the impact of impedance in a microbial fuel cell

机译：微生物燃料电池中阳极和阳极电解液群落生长的特征以及阻抗的影响

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Background A laboratory-scale two-chamber microbial fuel cell employing an aerated cathode with no catalyst was inoculated with mixed inoculum and acetate as the carbon source. Electrochemical impedance spectroscopy (EIS) was used to study the behavior of the MFC during initial biofilm (week 1) and maximum power density (week 20). EIS were performed on the anode chamber, biofilm (without anolyte) and anolyte (without biofilm). Nyquist plots of the EIS data were fitted with two equivalent electrical circuits to estimate the contributions of intrinsic resistances to the overall internal MFC impedance at weeks 1 and 20, respectively. Results The results showed that the system tended to increase power density from 15?±?3 (week 1) to 100?±?15 mW/m2 (week 20) and current density 211?±?7 (week 1) to 347?±?29 mA/m2 (week 20). The Samples were identified by pyrosequencing of the 16S rRNA gene and showed that initial inoculum (week 1) was constituted by Proteobacteria (40%), Bacteroidetes (22%) and Firmicutes (18%). At week 20, Proteobacterial species were predominant (60%) for electricity generation in the anode biofilm, being 51% Rhodopseudomonas palustris. Meanwhile on anolyte, Firmicutes phylum was predominant with Bacillus sp. This study proved that under the experimental conditions used there is an important contribution from the interaction of the biofilm and the anolyte on cell performance. Table 1 presents a summary of the specific influence of each element of the system under study. Conclusions The results showed certain members of the bacterial electrode community increased in relative abundance from the initial inoculum. For example, Proteobacterial species are important for electricity generation in the anode biofilms and Firmicutes phylum was predominant on anolyte to transfer electron. R1 is the same in the three systems and no variation is observed over time. The biofilm makes a significant contribution to the charge transfer processes at the electrode (R2 and Cdl) and, consequently, on the performance of the anode chamber. The biofilm can act as a barrier which reduces diffusion of the anolyte towards the electrode, all the while behaving like a porous material. The anolyte and its interaction with the biofilm exert a considerable influence on diffusion processes, given that it presents the highest values for Rd which increased at week 20.
机译：背景技术在实验室规模的两室微生物燃料电池中，使用没有催化剂的充气阴极，接种了混合接种物和乙酸盐作为碳源。电化学阻抗谱（EIS）用于研究MFC在初始生物膜（第1周）和最大功率密度（第20周）期间的行为。在阳极室，生物膜（无阳极液）和阳极液（无生物膜）上进行EIS。 EIS数据的Nyquist图安装了两个等效电路，以分别估计在第1周和第20周时固有电阻对整体内部MFC阻抗的贡献。结果结果表明，该系统趋向于将功率密度从15？±？3（第1周）增加到100？±？15 mW / m 2 （第20周），电流密度提高到211？±?。 7（第1周）至347？±？29 mA / m 2 （第20周）。通过对16S rRNA基因进行焦磷酸测序来鉴定样品，结果表明最初的接种物（第1周）由变形杆菌（40％），拟杆菌（22％）和硬毛菌（18％）组成。在第20周时，阳极生物膜中主要以Proteobacterial种（60％）发电，其中Palodoriseuspodomonas palustris为51％。同时，在阳极液上，门扇菌以芽孢杆菌为主。这项研究证明，在使用的实验条件下，生物膜和阳极电解液的相互作用对细胞性能具有重要的贡献。表1总结了所研究系统的每个元素的特定影响。结论结果表明，细菌电极群落的某些成员相对于初始接种物而言相对丰度增加。例如，变形杆菌物种对于阳极生物膜中的发电很重要，而Firmicutes phylum主要在阳极电解液上转移电子。在三个系统中，R1相同，并且未随时间变化。生物膜对电极上的电荷转移过程（R2和Cdl）做出了重大贡献，因此对阳极室的性能也做出了重大贡献。生物膜可以充当屏障，减少阳极电解液向电极的扩散，同时始终表现得像多孔材料。阳极电解液及其与生物膜的相互作用对扩散过程具有相当大的影响，因为它呈现出在20周时增加的Rd的最大值。

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