Vargas Ignacio T, Tapia Natalia, Regan John M
Department of Hydraulic and Environmental Engineering, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile.
Centro de Desarrollo Urbano Sustentable (CEDEUS), Santiago 7520246, Chile.
Materials (Basel). 2022 Jan 5;15(1):379. doi: 10.3390/ma15010379.
During the last decade, bioprospecting for electrochemically active bacteria has included the search for new sources of inoculum for microbial fuel cells (MFCs). However, concerning power and current production, a -dominated mixed microbial community derived from a wastewater inoculum remains the standard. On the other hand, cathode performance is still one of the main limitations for MFCs, and the enrichment of a beneficial cathodic biofilm emerges as an alternative to increase its performance. Glucose-fed air-cathode reactors inoculated with a rumen-fluid enrichment and wastewater showed higher power densities and soluble chemical oxygen demand (sCOD) removal (Pmax = 824.5 mWm; ΔsCOD = 96.1%) than reactors inoculated only with wastewater (Pmax = 634.1 mWm; ΔsCOD = 91.7%). Identical anode but different cathode potentials suggest that differences in performance were due to the cathode. Pyrosequencing analysis showed no significant differences between the anodic community structures derived from both inocula but increased relative abundances of and species in the cathodic rumen enrichment. Results suggest that this rarely used inoculum for single-chamber MFCs contributed to cathodic biofilm improvements with no anodic biofilm effects.
在过去十年中，对具有电化学活性的细菌进行生物勘探包括寻找用于微生物燃料电池（MFC）的新接种源。然而，就功率和电流产生而言，源自废水接种物的以a为主的混合微生物群落仍是标准。另一方面，阴极性能仍然是MFC的主要限制之一，富集有益的阴极生物膜成为提高其性能的一种替代方法。接种瘤胃液富集物和废水的葡萄糖供料空气阴极反应器比仅接种废水的反应器表现出更高的功率密度和可溶性化学需氧量（sCOD）去除率（Pmax = 824.5 mW/m²；ΔsCOD = 96.1%）（Pmax = 634.1 mW/m²；ΔsCOD = 91.7%）。相同的阳极但不同的阴极电位表明性能差异归因于阴极。焦磷酸测序分析表明，两种接种物衍生的阳极群落结构之间没有显著差异，但阴极瘤胃液富集物中 和 物种的相对丰度增加。结果表明，这种很少用于单室MFC的接种物有助于改善阴极生物膜，而对阳极生物膜没有影响。
