外电阻值对3A-MFC产电和脱氮性能的影响

doi:10.16085/j.issn.1000-6613.2018-2299

摘要/Abstract

摘要：

构建三阳极单阴极型微生物燃料电池（three-anode microbial fuel cells，3A-MFC），该间歇流反应器通过在阳极提供有机物，在阴极提供有机物、氨氮和氧气，在产电的同时实现生物阴极同步硝化反硝化脱氮。考察了外电阻值分别为1000Ω、500Ω、150Ω、50Ω时对3A-MFC产电及脱氮性能的影响，当外电阻值为150Ω时，产电量达到最大值为583C，阳极库仑效率达到最大值为1.70%，内阻达到最小值为200Ω，此时外电阻值与内阻值最接近，产电效果最好。外电阻值由1000Ω减小到150Ω时，总氮（TN）去除率从79.7%上升到最大值为84.1%，TN去除速率从7.5mg/(L·d)上升到最大值为13.1mg/(L?d)。在一定外电阻值范围内，伴随其值的减小，电子转移速率逐渐提高，同时电对微生物的刺激作用得到增强，能够实现最佳的TN去除效率和去除速率。

关键词: 电化学, 间歇式, 生物过程, 三阳极单阴极, 微生物燃料电池, 氨氮迁移, 同步硝化反硝化

Abstract:

A novel three-anode microbial fuel cell (3A-MFC) was used to produce electricity by providing organic at the anode and organic, ammonia and oxygen at the cathode. Simultaneous nitrification and denitrification were efficiently achieved at the biocathode. The effects of external resistance values of 1000Ω, 500Ω, 150Ω, and 50Ω on the electricity generation and denitrification performance of 3A-MFC were investigated. The maximum output of 583C could be achieved at the external resistance value of 150Ω, which was 2.0, 1.6, 2.5 times of those at the external resistance value of 1000Ω, 500Ω and 50Ω, respectively. Meanwhile, the anode coulombic efficiency reached a maximum value of 1.70% and the internal resistance reached a minimum value of 200Ω. At this time, the external resistance value was the closest to the internal resistance value, and the power generation reached the peak. When the external resistance decreased from 1000Ω to 150Ω, the total nitrogen (TN) removal efficiency increased from 79.7% to a maximum value of 84.1%. The TN removal rate increased from 7.5mg/(L·d) to 13.1mg/(L·d). With the external resistance value reducing, the electron transfer rate was improved, and the stimulation of the microorganisms was enhanced. So the optimal TN removal efficiency and rate were achieved.

Key words: electrochemistry, batchwise, bioprocess, three anodes, microbial fuel cells, ammonia nitrogen migration, simultaneous nitrification and denitrification

中图分类号:

X703

陆圆,顾霞,陆勇泽,黄珊,朱光灿. 外电阻值对3A-MFC产电和脱氮性能的影响[J]. 化工进展, 2019, 38(08): 3910-3916.

Yuan LU,Xia GU,Yongze LU,Shan HUANG,Guangcan ZHU. Effects of external resistance on the performance of three-anode-MFC: electricity generation and simultaneous nitrification anddenitrification efficiency[J]. Chemical Industry and Engineering Progress, 2019, 38(08): 3910-3916.

图/表 8

图1 3A-MFC实验装置示意图

图2 外电阻值对3A-MFC产电的影响

表1 不同外电阻值下3A-MFC产电性能

外电阻值/Ω	最大功率密度/mW·m^-3	内阻/Ω	产电量/C	平均电流/mA
1000	130.1	281	292	0.71
500	166.1	209	360	0.79
150	182.9	200	583	1.32
50	41.8	218	231	0.67

图3 不同外电阻值下3A-MFC系统功率密度曲线和极化曲线

表2 不同外电阻值下3A-MFC系统阴极内阻

外电阻值/Ω	阴极内阻/Ω	欧姆内阻/Ω	极化内阻/Ω	扩散内阻/Ω
1000	34.3	0.6	33.5	0.2
500	43.9	0.8	36.9	6.1
150	4.5	0.8	2.5	1.1
50	42.0	0.6	29.4	12.1

图4 不同外电阻值下3A-MFC系统Nyquist图

图5 外电阻值对3A-MFC系统阳极COD降解的影响

图6 外电阻值对3A-MFC系统氮素及阴极有机物浓度变化的影响

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