外电阻对双阴极微生物燃料电池脱氮产电性能的影响  

Effect of external resistance on denitrification and electricity generation performance of double-cathode microbial fuel cell

作　　者：张建民 李哲远 崔心水 周佳佳[1] 李亚妮 ZHANG Jianmin;LI Zheyuan;CUI Xinshui;ZHOU Jiajia;LI Yani(School of Urban Planning and Municipal Engineering,Xi′an Polytechnic University,Xi′an 710048,China;School of Environmental Science an Engineering,Chang′an University,Xi′an 710054,China)

机构地区：[1]西安工程大学城市规划与市政工程学院,西安710048 [2]长安大学环境科学与工程学院,西安710054

出　　处：《环境工程学报》2020年第7期1762-1770,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51778057)。

摘　　要：为提高双阴极MFC的脱氮产电性能,构建了双阴极微生物燃料电池系统,考察了连续进水状态下阳极与缺氧阴极间外阻(RA-A)以及阳极与好氧阴极间外阻(RA-O)的变化对系统脱氮产电性能的影响。结果表明:只增大一侧电阻会降低厌氧阳极的库仑效率和功率密度,但能提高系统的脱氮效果;当RA-O由200Ω增大到1 000Ω时,TN去除率由43.81%提高到60.71%,当RA-A由200Ω增大到1 000Ω时,TN去除率由38.88%提高到61.52%;当总外阻固定在1 000Ω时,两侧电阻变化不影响阳极的功率密度和库仑效率,其分别保持在305.53 mW·m-3和0.35%左右;电阻组合(RA-A/RA-O)由500Ω/500Ω变化为100Ω/900Ω,TN去除率由62.32%提高到64.41%;系统的硝化效果随RA-O的增大而增强,反硝化效果随RA-A的减小而增强,总氮去除效果随总外阻的增大而提升。低RA-A与高RA-O的外阻组合能有效提高双阴极三室MFC的脱氮能力。增大总外阻,系统产电性能降低,阳极表面微生物膜氧化性不断减弱,总外阻不变,阳极表面氧化性变化不大。研究探明了外电阻变化对三室双阴极MFC脱氮产电性能的影响,为进一步提高MFC脱氮产电性能提供参考。In order to improve the nitrogen removal and electricity generation performance of dual cathode MFC, a dual cathode microbial fuel cell system was built. Under continuous water inflow, the effects of change in the external resistance between the anode and the anoxic cathode(RA-A) and the external resistance between the anode and the aerobic cathode(RA-O) on the nitrogen removal and electricity generation performance of the system were examined. The results showed that when the resistance on one side increased, the coulomb efficiency and power density of the anaerobic anode decreased, but the nitrogen removal effect of the system increased. When RA-O increased from 200 Ω to 1 000 Ω, TN removal rate increased from 43.81% to 60.71%.When RA-A increased from 200 Ω to 1 000 Ω, TN removal rate increased from 38.88% to 61.52%. When the total external resistance was fixed at 1 000 Ω, the changes in the resistance on both sides did not affect the power density and Coulomb efficiency of the anode, which could maintain at about 305.53 mW·m-3 and 0.35%,respectively. The combination of small RA-A and large RA-O could improve the nitrogen removal effect of dual cathode MFC, when the resistance combination(RA-A/RA-O) changed from 500 Ω/500 Ω to 100 Ω/900 Ω, TN removal rate increased from 62.32% to 64.41%. The nitrification effect of the system increased with the increase of RA-O, the denitrification effect increased with the decrease of RA-A, and the total nitrogen removal effect increased with the increase of total external resistance. The external resistance combination of low RA-A and high RA-O could effectively improve the nitrogen removal capacity of the dual cathode three-chamber MFC.Increasing the total external resistance reduced the power generation performance of the system, and weakened the oxidizing ability of the microbial membrane on the anode surface. The total external resistance did not change, then little change in surface oxidation of the anode occurred. This study clarified the effects of change in

关 键 词：双阴极 微生物燃料电池 电阻 脱氮 循环伏安扫描 

分 类 号：X703[环境科学与工程—环境工程]