中心脉冲气-液-固循环流化床微生物燃料电池产电特性

doi:10.11949/0438-1157.20240219

摘要/Abstract

摘要：

为进一步提升微生物燃料电池（MFC）的电化学性能，设计并搭建了一个中心脉冲气-液-固循环流化床微生物燃料电池（CPCFB-MFC），通过设计多组实验工况研究了脉冲液流频率和幅值、颗粒循环速率及气体流量对CPCFB-MFC产电及污水处理特性的影响。在中心液流脉冲频率为0.25 Hz、脉冲幅值为0.08 m/s、颗粒循环速率为3.3 kg/(m²·s）、气体流量为2 L/min条件下，CPCFB-MFC的输出电压达到最高(为649.2 mV），此时污水处理时间最短(为77 h）。通过对比不同工况的污水处理效率和综合能耗，证明了在反应器内采用脉冲液流和气-液-固循环运行方式能进一步提升MFC的综合性能。这项工作对推动微生物燃料电池技术的产业化具有重要意义。

关键词: 微生物燃料电池, 循环流化床, 脉冲液流, 产电, 污水处理, 活性炭

Abstract:

In order to further improve the electrochemical performance of microbial fuel cell (MFC), a central pulse gas-liquid-solid circulating fluidized bed microbial fuel cell reactor (CPCFB-MFC) was designed and constructed. The effects of pulse liquid flow frequency, amplitude, particle circulation rate, and gas flow rate on the power generation and sewage treatment characteristics of CPCFB-MFC were studied by designing multiple experimental conditions. Under the conditions of central liquid flow pulse frequency of 0.25 Hz, pulse amplitude of 0.08 m/s, particle circulation rate of 3.3 kg/(m²·s) and gas flow of 2 L/min, the output voltage of CPCFB-MFC reached the highest, which was 649.2 mV, and the sewage treatment time was the shortest, which was 77 h. By comparing the sewage treatment efficiency and comprehensive energy consumption under different operating conditions, it can be proven that the adoption of pulse liquid flow and gas-liquid-solid multiphase operation can further improve the comprehensive performance of MFC reactors. This work is of great significance for promoting the industrialization of microbial fuel cell technology.

Key words: microbial fuel cell, circulating fluidized bed, pulse liquid flow, electricity generation, sewage treatment, activated carbon

中图分类号:

TM 911.45

朱楼, 宋杨凡, 王猛, 施睿鹏, 厉彦民, 陈鸿伟, 刘卓, 魏翔. 中心脉冲气-液-固循环流化床微生物燃料电池产电特性[J]. 化工学报, 2024, 75(8): 2991-3001.

Lou ZHU, Yangfan SONG, Meng WANG, Ruipeng SHI, Yanmin LI, Hongwei CHEN, Zhuo LIU, Xiang WEI. Power generation characteristics of central pulse gas-liquid-solid circulating fluidized bed microbial fuel cell[J]. CIESC Journal, 2024, 75(8): 2991-3001.

图/表 11

表1 自配污水主要成分

Table 1 Main components of self-configured wastewater

试剂	浓度/(g/L)
Na₂HPO₄·12H₂O	11.55
NaH₂PO₄	2.13
CH₃COONa	1
NaCl	1
NH₄Cl	0.31
KCl	0.13
CaCl₂	0.10

图1 接种污泥主要菌门分布

Fig.1 Distribution of main bacterial phyla in inoculated sludge

图2 中心脉冲气液固循环流化床微生物燃料电池系统示意图

Fig.2 Schematic diagram of CPCFB-MFC

表2 实验工况

Table 2 Experimental conditions

工况	脉冲液流频率f/Hz	脉冲液流幅值A /(m/s)	颗粒循环速率G_s/(kg/(m²⋅s))	气体流量Q_g/(L/min)
1	0	0.08	2.2	2
2	0.125	0.08	2.2	2
3	0.25	0.08	2.2	2
4	0.5	0.08	2.2	2
5	0.25	0.06	2.2	2
6	0.25	0.1	2.2	2
7	0.25	0.12	2.2	2
8	0.25	0.08	1.1	2
9	0.25	0.08	3.3	2
10	0.25	0.08	4.4	2
11	0.25	0.08	2.2	0
12	0.25	0.08	2.2	1
13	0.25	0.08	2.2	3
14	0	0.08	2.2	0

图3 脉冲频率对CPCFB-MFC产电及处理污水性能的影响

Fig.3 Effect of pulse frequency on power generation and sewage treatment performance of CPCFB-MFC

图4 脉冲幅值对CPCFB-MFC产电及处理污水性能的影响

Fig.4 Effect of pulse amplitude on power generation and sewage treatment performance of CPCFB-MFC

图5 颗粒循环速率对CPCFB-MFC产电及处理污水性能的影响

Fig.5 Effect of solids circulating rate on power generation and sewage treatment performance of CPCFB-MFC

图6 气体流量对CPCFB-MFC产电及处理污水性能的影响

Fig.6 Effect of gas flow rate on power generation and sewage treatment performance of CPCFB-MFC

图7 工况1、3、11和14的最高产电电压与产电周期对比

Fig.7 Comparison of power generation voltage and period of Conditions 1, 3, 11, and 14

图8 CPCFB-MFC不同操作条件下的极化曲线与功率密度曲线

Fig.8 Polarization and power density curves of CPCFB-MFC under different operating conditions

图9 不同工况下CPCFB-MFC综合能耗对比

Fig.9 Comparison of comprehensive energy consumption of CPCFB-MFC under different operating conditions

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