添加大豆寡糖沉积物对海底微生物燃料电池电化学性能的影响

Effect of Adding Soybean Oligosaccharide Deposits on the Electrochemical Performance of Marine Sediment Microbial Fuel Cells

通过向海底沉积物中添加不同浓度的大豆寡糖(SBOS),探究其对海底沉积物微生物燃料电池(MSMFCs)的影响。结果表明,阳极表面附近微生物数量与SBOS浓度有关,添加2 g SBOS组的微生物数量最多(9.310×10^(11)cfu/m^2),添加6 g SBOS组的微生物数量最少(7.680×10~8cfu/m^2);SBOS浓度影响阳极电化学性能,添加2 g SBOS组阳极的电容性、抗极化能力最好,添加6 g SBOS组的最差;高浓度SBOS有利于提高MSMFCs的实际输出电压,添加6 g SBOS组的平均输出电压高出空白组45 m V,高出其它实验组15~20 m V;空白组有机质消耗率最高,为66.15%,添加6g SBOS组的消耗率最低,为50.63%;SBOS以改变微生物数量的方式影响MSMFCs电化学、产电性能和有机质消耗率。

The effects of addition of different concentrations of soybean oligosaccharides（SBOS）in marine sediment microbial fuel cells（MSMFCs）were explored.The amount of microbes attached to the surface of the anode was closely related to the concentration of SBOS.The amount of microbes in MSMFCs added 2 g of SBOS was the largest,reaching 9.310×10^11cfu/m^2 and the number of microbes in MSMFCs added 6 g of SBOS was the lowest,7.680×10^8 cfu/m^2.Electrochemical tests showed that the concentration of SBOS affected the electrochemical performance of the anode.The capacity and the anti-polarization performance of anodes in cells added 2 g of SBOS were the best,while the worst was that added 6 g of SBOS.The long-term output voltage showed that the high concentration of SBOS assisted to improve the output voltage of MSMFCs.The average output voltage of the cell added 6 g of SBOS was 45 m V higher than that of the blank group and 15-20 m V higher than those of other experimental groups.Heat loss of organic matters showed that the highest consumption rate was 66.15% of the blank group,and the lowest consumption rate was 50.63% of the group added 6 g of SBOS.Mechanism analysis showed that SBOS affected the electrochemical and the electrogenic performances and the organic matter consumption rates of MSMFCs by changing the number of microbes.