厌氧折流板式微生物燃料电池堆影响因素研究

Parameters affecting the performance of anaerobic baffled stacking microbial fuel cell

微生物燃料电池(MFC)中输出电压/电流的提升,以及反应器体积的扩展放大是其工程化应用的关键。本文构建了一个总体积为6.4 L的新型厌氧折流板式微生物燃料电池堆(ABSMFC)。以葡萄糖作为底物,探讨了阳极材料、液面高程差和水力停留时间(HRT)等因素对ABSMFC性能的影响。结果表明,碳纤维毡作为阳极时,电池单体外电路平均分压(R_(ex)=1 000Ω)为210 mV,填充石墨颗粒后增加到319.8 mV。格室间存在液面高程差时,电池单体、串联和并联的功率密度分别为207.1、181.1和215.7 mW/m^2,当无液面高程差(即水力相连)时为205.8、69.5和151.5 mW/m^2。4个电池单体串联和并联连接时,HRT对ABSMFC的产电稳定性无影响,溶解性COD的去除率和库仑效率均随HRT的增加而升高,且并联效果优于串联。

To increase the power output simultaneously scale-up the reactor of microbial fuel cell （MFC）, a novel anaerobic baffled stacking microbial fuel cell （ABSMFC） was constructed with a total volume of 6.4 L. By using the glucose, the factors that affected the performance of MFC units, series and parallel stacks were studied, including anode electrode materials, liquid-level difference in elevation and hydraulic retention time （HRT）. The results showed that the average voltage output of external resistance of 1 000 Ω was 210 mV using the carbon fiber felt as anode, and it reached 319.8 mV once the graphite granules were added to the anodic chamber. In the ease of liquid-level difference in elevation of four compartments, the average maximal power densities of four MFC units, series stack and parallel stack were 207. 1 mW/m^2 , 181. 1 mW/m^2 and 215.7 mW/ m^2, respectively, while they were 205.8 mW/m^2,69. 5 mW/m^2 and 151.5 mW/m^2 without liquid-level differenee in elevation. Both in the series and parallel stacks, the power output were kept stable with HRT increase, while the soluble COD and the Coulombic efficiency were increased with HRT increase, and the parallel stack had better performance than series stack.