Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Słoneczna 45 G, 10-709 Olsztyn, Poland.
Department of Chemistry, University of Warmia and Mazury in Olsztyn, plac Łódzki 4, 10-721 Olsztyn, Poland.
Int J Environ Res Public Health. 2023 Jan 31;20(3):2580. doi: 10.3390/ijerph20032580.
This study investigated how anode electrode modification with iron affects the microbiome and electricity generation of microbial fuel cells (MFCs) fed with municipal wastewater. Doses of 0.0 (control), 0.05, 0.1, 0.2, and 0.4 g FeO per the total anode electrode area were tested. FeO doses from 0.05 to 0.2 g improved electricity generation; with a dose of 0.10 g FeO, the cell power was highest (1.39 mW/m), and the internal resistance was lowest (184.9 Ω). Although acetate was the main source of organics in the municipal wastewater, propionic and valeric acids predominated in the outflows from all MFCs. In addition, Fe-modification stimulated the growth of the extracellular polymer producers sp. and sp., which favored biofilm formation. Electrogenic sp. had the highest percent abundance in the anode of the control MFC, which generated the least electricity. However, with 0.05 and 0.10 g FeO doses, sp., sp., and sp. predominated in the anode microbiomes, and with 0.2 and 0.4 g doses, the electrogens sp. and sp. predominated. This is the first study to holistically examine how different amounts of Fe on the anode affect electricity generation, the microbiome, and metabolic products in the outflow of MFCs fed with synthetic municipal wastewater.
本研究调查了阳极电极用铁进行修饰如何影响微生物燃料电池（MFC）的微生物组和发电，该 MFC 以城市废水为食。测试了阳极电极总面积的 0.0（对照）、0.05、0.1、0.2 和 0.4 g FeO 的剂量。0.05 至 0.2 g 的 FeO 剂量提高了发电效率；当 FeO 剂量为 0.10 g 时，电池功率最高（1.39 mW/m），内阻最低（184.9 Ω）。尽管乙酸盐是城市废水中有机物的主要来源，但丙酸和戊酸在所有 MFC 的流出物中占主导地位。此外，Fe 修饰刺激了胞外聚合物产生菌 sp. 和 sp. 的生长，有利于生物膜的形成。产电菌 sp. 在对照 MFC 的阳极中丰度最高，但产生的电量最少。然而，当 FeO 剂量为 0.05 和 0.10 g 时，阳极微生物组中 sp.、sp. 和 sp. 占主导地位，而当 FeO 剂量为 0.2 和 0.4 g 时，电生菌 sp. 和 sp. 占主导地位。这是首次全面研究阳极上不同量的铁如何影响以合成城市废水为食的 MFC 的发电、微生物组和流出物中的代谢产物。
