The Limits of Three‐Dimensionality: Systematic Assessment of Effective Anode Macrostructure Dimensions for Mixed‐Culture Electroactive Biofilms
The Limits of Three‐Dimensionality: Systematic Assessment of Effective Anode Macrostructure Dimensions for Mixed‐Culture Electroactive Biofilms
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DOI：
10.1002/cssc.201902923
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发表时间：
2019-11
期刊：
影响因子：
8.4
通讯作者：
Christopher Moß;A. Behrens;U. Schröder
中科院分区：
文献类型：
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作者：
Christopher Moß;A. Behrens;U. Schröder
摘要本研究分析了低剪切力条件下混合培养的电化学活性生物膜(EABs)在大结构电极上的生物膜生长和长期电流产生。在4 0 0μm~2 mm的范围内系统地改变通道的尺寸，在1~4 mm的范围内改变通道的高度以模拟不同尺度的宏观结构。表面更精细的电极由于其大的表面积在短期内产生更高的电流密度，但从长期来看表现更好，因为生物量的积累导致向结构中的传质受到限制。观察到通道尺寸为1×4 mm的电极的长期性能最好，其长期性能没有明显下降。生物膜覆盖了直径为400μm的沟道，导致了从三维到二维的转变，表明这种尺度的结构可能不适合在低剪应力条件下长期运行。
Abstract This study analyzes the biofilm growth and long‐term current production of mixed‐culture, electrochemically active biofilms (EABs) on macrostructured electrodes under low‐shear‐force conditions. The channel dimensions were altered systematically in the range 400 μm to 2 mm, and the channel heights were varied between 1 and 4 mm to simulate macrostructures of different scales. Electrodes with finer‐structured surfaces produced higher current densities in the short term owing to their large surface area but were outperformed in the long term because the accumulation of biomass led to limitations of mass transfer into the structures. The best long‐term performance was observed for electrodes with channel dimensions of 1×4 mm, which showed no significant decrease in performance in the long term. Channels with a diameter of 400 μm were overgrown by the biofilm, which led to a transition from 3 D to 2 D behavior, indicating that structures of this scale might not be suitable for long‐term operation under low‐shear‐stress conditions.