微生物燃料电池在高盐榨菜废水处理中的产电性能

Microbial fuel cell for electricity generation during high-salinity mustard tuber wastewater treatment

基于双室微生物燃料电池(microbial fuel cells,MFCs),以高盐榨菜废水为燃料,考察了电池的运行状况,同时探讨了盐度变化对电池产电性能影响,并通过投加甜菜碱研究其对MFCs系统抵抗盐度负荷冲击能力的影响。结果表明:MFCs稳定运行时(阳极室容积80 m L),最大功率密度、开路电压和电池内阻分别为3.55 W·m-3、0.698 V和427Ω;底物中添加2 mmol·L^(-1)甜菜碱后电池产电性能得到明显提升;当废水含盐量(增加到5 g·L^(-1)Na Cl)为31.2 g·L^(-1)时电池产电性能达到最佳,但是继续增高盐度后电池产电性能会急剧下降;投加甜菜碱有助于提高系统抵抗盐度负荷变化造成的冲击,维持电池的产电输出。

Mustard tuber wastewater was utilized here as a fuel in the typical dual-chamber microbial fuel cells（ MFCs）. The effect of increasing anodic Na Cl concentration on MFC performance was evaluated. Glycine betaine was added into the influent,and the effect on the ability of anaerobic microbial consortia to adapt to salinity changes was studied. The results showed that after domestication（ the anodic working volume was 80 m L）,the maximal power density of MFCs was 3. 55 W·m- 3,open circuit voltage（ OCV） was 0. 698 V,and internal resistance was 427 Ω. The efficiency of electricity generation was significantly improved after the addition of glycine betaine at a dose of 2 mmol·L- 1. Adding up to 5 g·L- 1Na Cl（ using a stock solution 31. 2 g·L- 1） enhanced the overall performance of the system. Higher Na Cl concentrations proved detrimental to the system. Furthermore,the addition of glycine betaine enhanced the ability of the anaerobic microbial consortia to adapt to salinity changes; this enhancement ensured stability of the electricity generation.