摘要
微生物燃料电池(MFC)是一种以微生物为阳极催化剂,将化学能直接转化成电能的装置。构建了一个无中间体、无膜的微生物燃料电池,电池以生活污水为初始接种体,以葡萄糖水溶液为原料,考察了溶液浓度、外电阻、温度、氧气和苯酚加入等因素对电池性能的影响,分析了电池中微生物的生化反应动力学特征。结果显示:微生物燃料电池中电流的产生主要是依靠电极表面吸附微生物直接将代谢产生的电子传递给电极表面所致;电池适宜温度为35℃,氧气的存在不利于电池电流输出;在低浓度范围内(<500mg·L·1),电池电压输出与溶液浓度之间符合Monod方程;电池电压与外电阻之间呈直线关系(V=525-418i,相关系数r=0.998),由此可推出,电池内电阻为418°;而经过长期驯化,电池能适应苯酚的存在,但苯酚降解对电池电流的输出贡献较小。
In the microbial fuel cell, the microbial is used as anodic catalyst and the chemical energy is directly changed into electrical energy. In this paper, a mediator- and membrane-less microbial fuel cell was constructed, in which the domestic wastewater was used as inoculant and glucose as fuel. The effects of glucose concentration, oxygen and phenol addition, operating temperature and outer resistance on the cell performance were investigated, besides, the kinetic characteristic of the microbial and the inner resistance of the cell were analyzed. The results show that it is the microbial adsorbed on the anode, not the one existed in the solution, that transfer the electrons to the anode, and in the range of low substrate concentration （〈500 mg·L^-1）, the relation of outer voltage and glucose concentration agrees with Monod equation. Oxygen is adverse to current output because of electron transferring to oxygen during aerobic metabolism, and after long domestication, the microbial in cell can adapt well to phenol, but phenol is little responsible for the current output of the cell. It was found that the optimal temperature for microbial in cell is about 35℃, and the relation between the outer voltage and current output is linear, it can be expressed as： V=525-418i with correlation coefficient r-0.998, accordingly, the inner resistance of the cell is 418 Ω. The power density of the cell arrives its maximum when outer resistance is about 500 Ω, which is close to the inner resistance of the cell.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2008年第1期177-181,共5页
Journal of Chemical Engineering of Chinese Universities
基金
中国石油天然气集团公司石油科技中青年创新基金资助项目(05E7021)
