【摘要】 采用剩余污泥厌氧发酵液为阳极燃料、铁氰化钾溶液为阴极电子受体,成功启动了双室微生物燃料电池(WC)考察了厌氧发酵过程中剩余污泥上清液中各种挥发性脂肪酸(VFAs)含量的变化,研究分析了污泥厌氧发酵液燃料电池的产电过程、燃料消耗及电子供体.结果表明,污泥厌氧发酵液中乙酸含量最高(约占总VFAs的50%),异戊酸和丙酸含量次之(分别约占总VFAs的18%及15%),正丁酸和异丁酸含量较少(均低于总VFAs的10%),正戊酸含量最低(低于总VFAs的1%);MFC实现了250h稳定电压输出(0.65±0.05V),库伦效率为9.09%;阳极总化学需氧量(TCOD),溶解性化学需氧量(SCOD),VFAs均呈现整体下降趋势,TCOD和SCOD的去除率分别为74.9%和86.4%;VFAs的完全消耗伴随着反应器产电性能迅速变差,表明VFAs是主要电子供体;在MFC产电过程中,VFAs的消耗与产生同时存在,消耗总体快于产生;各种VFAs消耗快慢依次为:乙酸>正丁酸>丙酸>正戊酸>异戊酸>异丁酸.更多还原

【Abstract】 A double-chamber microbial fuel cell(MFC) was successfully started up by using the supernatant of anaerobically fermented excess sludge as substrate in the anode chamber and potassium ferricyanide as electron acceptor in the cathode chamber.The concentration changes of various volatile fatty acids(VFAs) in the supernatant were investigated during the anaerobic fermentation process of the sludge.Then the electricity production process of the MFC was studied,and the substrate consumption and electron donors during electricity production were also analyzed.The results indicated that the acetic acid concentration was the highest(approximately accounting for 50%of total VFAs),followed by isovaleric acid and propionic acid(respectively about 18%and 15%of total VFAs),n-butyric acid and isobutyric acid(all less than 10%of total VFAs),while the n-valeric concentration was the lowest(less than 1%of total VFAs) among the VFAs in the supernatant of anaerobically fermented sludge.The MFC kept a stable voltage output(0.65±0.05V) for 250 h,and the coulombic efficiency was 9.09%.An overall degradation trend was found among the total chemical oxygen demand(TCOD),the soluble chemical oxygen demand(SCOD) and VFAs during electricity production of the MFC.The removal rates of TCOD and SCOD were 74.9%、86.4%,respectively.The complete consumption of VFAs was accompanied by the rapid deterioration of the electricity production performance,indicating that the main electron donors were VFAs.The consumption and production of VFAs existed simultaneously during the process of electricity generation,while the consumption rates were faster than the production rates in general.The consumption rate sequence of various VFAs was as following:acetic acid> n-butyric acid> propionic acid> n-valeric acid> isovaleric acid>isobutyric acid.更多还原