Effect of external resistance on denitrification and electricity generation performance of double-cathode microbial fuel cell
ZHANG Jianmin1,,, LI Zheyuan1, CUI Xinshui1,2, ZHOU Jiajia1, LI Yani1 1.School of Urban Planning and Municipal Engineering, Xi′an Polytechnic University, Xi′an 710048, China 2.School of Environmental Science an Engineering, Chang′an University, Xi′an 710054, China
Abstract: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 the external resistance on the nitrogen removal and electricity generation performance of the dual cathode three-chamber MFC, and provided the reference for the further improvement of the nitrogen removal and electricity generation performance of MFC. Key words:dual-cathode/ microbial fuel cells/ resistance/ nitrogen removal/ cyclic voltammetric scanning.
图1实验装置示意图 Figure1.Schematic diagram of experimental device
表1RA-O增大对产电性能的影响 Table1.Effect of increasing RA-O on electrical performance
RA-A/Ω
功率密度/(mW·m?3)
库仑效率/%
厌氧阳极
缺氧阴极
好氧阴极
厌氧阳极
缺氧阴极
200
411.68
74.91
90.25
0.49
1.63
400
345.16
64.03
70.81
0.40
1.51
600
303.71
46.48
66.97
0.35
1.36
800
300.80
41.61
65.28
0.32
1.29
1 000
288.13
34.57
64.68
0.30
1.28
RA-A/Ω
功率密度/(mW·m?3)
库仑效率/%
厌氧阳极
缺氧阴极
好氧阴极
厌氧阳极
缺氧阴极
200
411.68
74.91
90.25
0.49
1.63
400
345.16
64.03
70.81
0.40
1.51
600
303.71
46.48
66.97
0.35
1.36
800
300.80
41.61
65.28
0.32
1.29
1 000
288.13
34.57
64.68
0.30
1.28
下载: 导出CSV 表2RA-A增大对产电性能的影响 Table2.Effect of increasing RA-A on electrical performance
RA-A/Ω
功率密度/(mW·m?3)
库仑效率/%
厌氧阳极
缺氧阴极
好氧阴极
厌氧阳极
缺氧阴极
200
419.97
73.85
91.51
0.48
1.95
400
341.47
58.96
73.96
0.40
1.19
600
327.21
56.53
65.61
0.37
0.86
800
320.38
59.51
59.29
0.35
0.72
1 000
316.39
55.76
53.78
0.33
0.67
RA-A/Ω
功率密度/(mW·m?3)
库仑效率/%
厌氧阳极
缺氧阴极
好氧阴极
厌氧阳极
缺氧阴极
200
419.97
73.85
91.51
0.48
1.95
400
341.47
58.96
73.96
0.40
1.19
600
327.21
56.53
65.61
0.37
0.86
800
320.38
59.51
59.29
0.35
0.72
1 000
316.39
55.76
53.78
0.33
0.67
下载: 导出CSV 表3总外阻不变不同组合对双阴极MFC产电性能的影响 Table3.Influence of the combination of total external resistance and invariable resistance onelectricity properties of the dual cathode three-chamber MFC
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1.School of Urban Planning and Municipal Engineering, Xi′an Polytechnic University, Xi′an 710048, China 2.School of Environmental Science an Engineering, Chang′an University, Xi′an 710054, China Received Date: 2019-09-20 Accepted Date: 2019-12-04 Available Online: 2020-07-10 Keywords:dual-cathode/ microbial fuel cells/ resistance/ nitrogen removal/ cyclic voltammetric scanning Abstract: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 the external resistance on the nitrogen removal and electricity generation performance of the dual cathode three-chamber MFC, and provided the reference for the further improvement of the nitrogen removal and electricity generation performance of MFC.
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