Liu Yiyang, Sun Xiaoyan, Yin Di, Cai Lankun, Zhang Lehua
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology Shanghai 200237 China
Institute of Hydrobiology, Chinese Academy of Sciences Wuhan 430072 China.
RSC Adv. 2020 Mar 9;10(17):9868-9877. doi: 10.1039/c9ra08288c. eCollection 2020 Mar 6.
Electricity generation in microbial fuel cells can be restricted by a few factors, such as the effective area of the anode for biofilm attachment, diffusion limitation of substrates and internal resistance. In this paper, a suspended anode (carbon-based felt granule)-type microbial fuel cell was developed to make full use of the volume of the anode chamber and provide a larger surface area of the anode for the growth of exoelectrogenic bacteria. The current collector was rotated in the anodic chamber to contact with the suspended granules intermittently and achieve better mixing. The open-circuit voltage reached steady state at around 0.83 V. The maximum power density obtained from each scenario increased steadily with the increase in mixing rate. The internal resistance decreased when the rotational rate and the content of the carbon granules were increased. The maximum power density reached 951 ± 14 mW m with a corresponding minimum internal resistance of 162.9 ± 3.5 Ω when the mass of carbon granules was 50 g and the rotational rate was 300 rpm. The suspended microbes made negligible contribution to the power density. The microbial fuel cell with a higher content of carbon granules had lower coulombic efficiency and lower relative abundance of exoelectrogenic bacteria.
微生物燃料电池中的发电可能会受到一些因素的限制，例如用于生物膜附着的阳极有效面积、底物的扩散限制和内阻。在本文中，开发了一种悬浮阳极（碳基毡颗粒）型微生物燃料电池，以充分利用阳极室的体积，并为产电细菌的生长提供更大的阳极表面积。集电器在阳极室内旋转，与悬浮颗粒间歇性接触，以实现更好的混合。开路电压在0.83 V左右达到稳态。在每种情况下获得的最大功率密度随着混合速率的增加而稳步增加。当转速和碳颗粒含量增加时，内阻降低。当碳颗粒质量为50 g且转速为300 rpm时，最大功率密度达到951±14 mW m，相应的最小内阻为162.9±3.5 Ω。悬浮微生物对功率密度的贡献可忽略不计。碳颗粒含量较高的微生物燃料电池具有较低的库仑效率和较低的产电细菌相对丰度。
