还原铁粉强化沉积型微生物燃料电池效能研究

Study on the Efficiency of Sedimentary Microbial Fuel Cell Enhanced by Reduced Iron Powder

为解决沉积型微生物燃料电池(SMFC)因较低的产电性能限制其应用的问题,通过向景观水底泥中添加还原铁粉,探究其对SMFC的强化效能,和对景观水体的修复效果。结果表明,空白组TOC去除率为46.22%,投加还原铁粉可将水体中TOC的去除率增加至50.20%~72.11%;同时提高SMFC的产电性能,还原铁粉投加量在20 g/L和100 g/L时添加还原铁粉输出功率密度较大,最大功率密度可从26.2 mW/m^(2)提升到79 mW/m^(2);阳极电势随还原铁粉投加量增加而降低,阳极电势最低为-0.533 V。电池运行60 d后的Fe^(2+)含量不会超出GB 3838-2002中集中式生活饮用水地表水的限值规定。鉴于其成本优势,具有较高的应用价值。

In order to solve the problem of sedimentary microbial fuel cell(SMFC) restricting its application due to lower power generation performance, reducing iron powder was added into the bottom mud of landscape water to explore the enhanced efficiency of reducing iron powder on SMFC and the restoration effect of landscape water. The results showed that, the removal rate of TOC in the blank group was 46.22%, and the removal rate of TOC in the water body increased to 50.20%~72.11% by adding reduced iron powder. At the same time, the electrical performance of SMFC was improved, when the dosage of reduced iron powder was 20 g/L and 100 g/L, the output power density of reduced iron powder was higher, and the maximum power density could be increased from 26.2 mW/m^(2) to 79 mW/m^(2). The anode potential decreased with the increase of the reduced iron powder dosage, and the minimum anode potential was-0.533 V. The Fe^(2+)content of the battery after 60 d of operation would not exceed the limit of the surface water for centralized drinking water in GB 3838-2002. In view of its cost advantage, it has high application value.