Li Xue-Xiao, Cheng Si-Chao, Fang Zhou, Li Xian-Ning
School of Energy and Environment, Southeast University, Nanjing 210096, China.
Huan Jing Ke Xue. 2017 May 8;38(5):1904-1910. doi: 10.13227/j.hjkx.201608193.
In this study, microbial fuel cell coupled constructed wetland (CW-MFC) was constructed for azo dye reactive brilliant red X-3B degradation and electricity production. The effects of support matrix and cathode areas on the degradation of X-3B and the electricity production of CW-MFC were investigated in this work to improve the performance of CW-MFC. The highest decolorization efficiency was 92.70% and was obtained when the CW-MFC was constructed with support matrix S3 with particle size of 10 mm and porosity of 30%. Small particle size increased the microbial biomass of the bottom layer of CW-MFC, which would promote the decolorization of X-3B in the bottom layer. However, it may cause the lack of nutrition in electrode layer and the increase in resistance of mass transfer, which would lead to the decline of electricity production. The decolorization efficiency and the power density of CW-MFC increased concomitantly with the increase of cathode areas, and the CW-MFC got the highest decolorization efficiency of 99.41% when the cathode area was 594 cm. The electricity production performance became stable when the cathode area continued to increase, while the decolorization efficiency declined. This may be attributed to that more electrons were transferred to the cathode to produce current instead of used in degradation of X-3B.
在本研究中，构建了微生物燃料电池耦合人工湿地（CW-MFC）用于偶氮染料活性艳红X-3B的降解及产电。本工作研究了支撑基质和阴极面积对CW-MFC中X-3B降解及产电的影响，以提高CW-MFC的性能。当CW-MFC采用粒径为10 mm、孔隙率为30%的支撑基质S3构建时，脱色效率最高，达92.70%。小粒径增加了CW-MFC底层的微生物量，这会促进底层X-3B的脱色。然而，这可能导致电极层营养缺乏及传质阻力增加，从而导致产电下降。CW-MFC的脱色效率和功率密度随阴极面积的增加而同步提高，当阴极面积为594 cm时，CW-MFC的脱色效率最高，达99.41%。当阴极面积继续增加时，产电性能变得稳定，而脱色效率下降。这可能是因为更多电子转移到阴极以产生电流，而非用于X-3B的降解。
