降解喹啉的微生物燃料电池的产电特性研究

Power generation from quinoline degradation using a microbial fuel cell

通过构建双极室微生物燃料电池(Microbialfuelcell,MFC),对喹啉的降解及MFC的产电性能进行了研究.试验结果表明,当喹啉初始浓度为500mg·mL-1,葡萄糖与喹啉浓度之比为1∶1,3∶5,1∶5时,MFC的最大输出电压分别为558mV、469mV、328mV,运行周期分别为56.4h、70h、82.5h;最大功率密度分别为173mW.m-2、122mW.m-2、60mW.m-2(按阳极截面积计算)或者35W.m-3、24W.m-3、12W.m-3(按阳极室有效容积计算).MFC可实现对喹啉的高效降解,但葡萄糖的浓度对喹啉的降解速率有较大影响.当葡萄糖浓度分别为500mg·mL-1、300mg·mL-1和100mg·mL-1时,使500mg·mL-1喹啉完全降解的时间分别为6h、24h和72h.MFC闭路条件下对喹啉的降解速率高于开路厌氧条件下的喹啉降解速率约10%.MFC对喹啉的降解与产电速率之间存在差距,喹啉被快速降解至较低浓度(<5mg·mL-1)后,MFC的产电性能才达到最优.MFC以用喹啉和葡萄糖作为混合燃料时,可以在实现高效降解喹啉的同时可稳定地向外输出电能,这为杂环芳烃类难降解有机物的高效低耗处理提供了新的途径.

A double-chamber Microbial Fuel Cell （MFC） was constructed to investigate quinoline degradation and power generation. Experiments were conducted using an initial quinoline concentration of 500 mg·L^-1 with different glucose concentrations （500 mg· L^-1, 300 mg· L^- 1, and 100 mg· L^- 1 ） as the MFC fuel. Results showed that maximum voltages of 558 mV, 469 mV and 328 mV corresponding to cycle times of 56.4 h, 70 h and 82.5 h were obtained for fuels with glucose to quinoline ratios of 1 ： 1, 3：5, and 1：5, respectively. Correspondingly, the maximal area power densities were 173 mW·m^-2, 122 mW·m^-2, 60 mW·m^-2, and the maximal volumetric power densities were 35 W· m^-3, 24 W·m^-3, 12 W· m^-3, and the times required to degrade quinoline completely were 6 h, 24 h, and 72 h. Compared to open circuit control, the MFC with closed circuit control enhanced quinoline biodegradation by 10%. Optimum power generation was obtained when quinoline was degraded to a low concentration （ 〈 5 mg· L^-1 ）. The results clearly demonstrated the feasibility of using the MFC to generate electricity using a quinoline and glucose mixture as fuel and simultaneously degrading the quinoline. The results offer a new method of enhancing biodegradation of recalcitrant contaminants, such as heterocyclic compounds, in practical applications.