Effect of anode substrate on the performance of microbial fuel cells for dealing with the straw hydrolysate
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摘要: 以双室微生物燃料电池为反应器，铁氰化钾为阴极液，研究污水处理厂活性污泥菌液和玉米秸秆水解液对MFC的产电性能的影响。结果表明，随着阳极中活性污泥菌液体积（1.5、3.0、4.5、6.0 mL）增加，MFC的产电量逐渐增加，当活性污泥的体积增加至7.5 mL时，产电量开始呈下降趋势；玉米秸秆水解液在底物中的浓度为0、10、15、20、30、40 g/L时，电池的稳定电压分别为54、157、248、208、170、146 mV。当阳极活性污泥菌液体积为6 mL、玉米秸秆水解液浓度为15 g/L时，微生物燃料电池的产电性能最佳，此时MFC的功率密度为54.6 mW/m2，内阻为496 Ω。同时，循环伏安曲线（C-V）和交流阻抗曲线（EIS）测试可知，MFC的电极过程由电荷传递和扩散过程共同控制，反应过程受电子传递控制。Abstract: The effects of both the concentration of corn stalk hydrolysis solution and the volume of activated sludge as an anode substrate on the performance of the double chamber microbial fuel cells (MFCs) were investigated. The double chamber MFCs were built with K3[Fe(CN)6] as the catholyte. The results show that with the increase in the activated sludge volume from 1.5 to 6.0 mL, the electricity generation of MFCs increases gradually, but it decreases when the activated sludge volume reaches 7.5 mL. As the mass concentration of corn stalk hydrolysate is 0, 10, 15, 20, 30, 40 g/L, the stable voltage of MFCs is 54, 157, 248, 208, 170 and 146 mV, respectively. The best performance of MFCs is obtained with the power density of 54.6 mW/m2 and the internal resistance of 496 Ω as the activated sludge volume is 6 mL and the corn straw hydrolysate is 15 g/L. Moreover, the cyclic voltammetry curve (C-V) and electrochemical impedance spectroscopy (EIS) tests prove that the electrode process is controlled by both the charge transfer and the diffusion process, while the reaction process is controlled by the electron transfer.
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Key words:
- microbial fuel cell /
- straw hydrolysate /
- activated sludge /
- anode substrate
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图 2 不同浓度秸秆水解液的MFCs电压输出
Figure 2 Voltage outputs of MFCs with different concentrations of straw liquid
图 3 不同浓度秸秆水解液的MFCs功率密度曲线
Figure 3 Power density curves of MFCs with different concentrations of straw liquid
图 4 不同浓度秸秆水解液的MFCs极化曲线
Figure 4 Polarization curves of MFCs with different concentrations of straw liquid
图 5 不同体积活性污泥菌液的MFCs电压输出
Figure 5 Voltage outputs of MFCs with different volumes of active sludge bacteria liquid
图 6 不同体积活性污泥菌液的MFCs功率密度曲线
Figure 6 Power density curves of MFCs with different volumes of active sludge bacteria liquid
图 7 不同体积活性污泥菌液的MFCs极化曲线
Figure 7 Polarization curves of MFCs with different volumes of active sludge bacteria liquid
图 8 阳极材料的扫描电镜照片
Figure 8 Scanning electron microscopy images of the different anodes
(a): not enriched; (b): enriched
表 1 MFCs运行7 d后不同浓度秸秆水解液的阳极组分分析
Table 1 Analysis of anodic component of MFCs with different concentrations of straw liquid after running seven days
Sample Content w/% total sugar yield total quality cellulose hemicellulose lignin 10 g/L 40.1 35.2 45.3 9.3 1.8 15 g/L 52.4 37.9 48.9 10.6 1.7 20 g/L 46.1 35.7 44.3 12.6 1.9 30 g/L 37.2 32.1 38.1 15.8 1.9 40 g/L 30.7 30.2 33.3 16.2 2.1 
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