连续流正渗透微生物燃料电池的运行性能研究

Performance of a novel osmotic microbial fuel cell in a continuous operation

针对微生物燃料电池(MFC)在处理污水时存在的出水水质差和产电低的问题,将正渗透(FO)膜代替MFC中的质子交换膜,开发了连续流的正渗透微生物燃料电池(OsMFCs).实验以OsMFCs为依托,考察长期处理城市污水时工艺的产电性能、污染物去除、FO膜运行及膜污染.结果表明,在39d的连续运行下,OsMFCs的电压稳定在500mV左右,功率密度为0.12 W/m^3,库伦效率为15.41%,具有较好的有机物和总磷去除效果,分别达到97.79%和98.52%.由于无机污染和生物污染,FO膜的通量从4.25L/(m^2·h)衰减到2L/(m^2·h)左右.与传统的MFC相比,OsMFCs在处理污水时有更好的产电性能和出水水质.

In order to enhance the bio-electricity generation and effluent water quality of microbial fuel cell （MFC） treating municipal wastewater, a novel osmotic MFC （OsMFC） was developed by replacing the proton exchange membrane with the forward osmosis （FO） membrane in a conventional MFC. In this study, the performance of a continuous OsMFC treating municipal wastewater including electricity production, organic matter, nitrogen and phosphorus removals, water flux and fouling of FO membrane was investigated. The results indicated that during 39 days operation of OsMFC, its output voltage was maintained at about 500 mV, and its power density and coulombic efficiency were 0. 12 W/ma and 15.41%, respectively. The OsMFC achieved perfect removals of organic matters and total phosphorus with removal rates of 97. 79% and 98. 52%, respectively. Moreover, the water flux of FO membrane decreased from 4. 25 L/（m2·h） to about 2 L/（m2·h） in the operation of OsMFC due to the inorganic fouling and biofouling. Compared to the traditional MFC, the OsMFC exhibited better bio-electricity generation and effluent water quality for treating municipal wastewater.