Anode potential can affect the degradation pathway of complex substrates in bioelectrochemical systems (BESs), thereby influencing current production and coulombic efficiency. However, the intricacies behind this interplay are poorly understood. This study used glucose as a model substrate to comprehensively investigate the effect of different anode potentials (- 150 mV, 0 mV and + 200 mV) on the relationship between current production, the electrogenic pathway and the abundance of the electrogenic microorganisms involved in batch mode fed BESs. Current production in glucose-acclimatized reactors was a function of the abundance of Geobacteraceae and of the availability of acetate and formate produced by glucose degradation. Current production was increased by high anode potentials during acclimation (0 mV and + 200 mV), likely due to more Geobacteraceae developing. However, this effect was much weaker than a stimulus from an artificial high acetate supply: acetate was the rate-limiting intermediate in these systems. The supply of acetate could not be influenced by anode potential; altering the flow regime, batch time and management of the upstream fermentation processes may be a greater engineering tool in BES. However, these findings suggest that if high current production is the focus, it will be extremely difficult to achieve success with complex waste streams such as domestic wastewater.

中文翻译：

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阳极电位对生物电化学系统中复杂基质电流产生的影响：葡萄糖的案例研究。

阳极电势会影响生物电化学系统（BESs）中复杂基质的降解途径，从而影响当前的生产和库仑效率。但是，这种相互作用背后的错综复杂却鲜为人知。这项研究以葡萄糖为模型底物，全面研究了不同阳极电位（-150 mV，0 mV和+ 200 mV）对分批模式下电流产生，电信号途径和电微生物的丰度之间关系的影响喂食BES。适应葡萄糖的反应器中的当前产量是土杆菌科的丰富性以及葡萄糖降解产生的乙酸盐和甲酸盐的可用性的函数。在驯化期间（0 mV和+ 200 mV），阳极电位高，电流产生增加，可能是由于更多的细菌科发展。但是，此效果远不如来自人工供应大量乙酸盐的刺激作用弱：乙酸盐是这些系统中的限速中间体。乙酸盐的供应不受阳极电位的影响；在BES中，改变流动方式，批处理时间和上游发酵过程的管理可能是一个更好的工程工具。但是，这些发现表明，如果以高电流生产为重点，那么利用复杂的废水流（如生活污水）将很难取得成功。分批时间和上游发酵过程的管理可能是BES中更好的工程工具。但是，这些发现表明，如果以高电流生产为重点，那么利用复杂的废水流（如生活污水）将很难取得成功。分批时间和上游发酵过程的管理可能是BES中更好的工程工具。但是，这些发现表明，如果以高电流生产为重点，那么利用复杂的废水流（如生活污水）将很难取得成功。