短暂外电场刺激对MFC性能的影响研究

Effect of Transient External Voltage on MFC Performance

为了解电压对微生物燃料电池性能(MFC)的影响,将硝酸盐还原和电刺激相结合,研究了以硝酸盐废水作为阴极液时,施加短暂外接电压对MFC性能的影响。结果表明:施加外部电压会影响MFC在其稳定运行过程中的性能,即使在移除电压后,这种影响仍然存在;在外部电压为0.5、0.8和1.1 V的情况下,MFC的化学需氧量的降解效率有所提高,最佳施加外接电压为1.1 V;与没有施加外部电压的空白对照组相比,在1.1 V的条件下,MFC的化学需氧量降解效率以及在稳定产电周期内的电流密度和硝酸盐去除效率均有所提高;在电压为1.1 V的MFC反应器中稳定产电运行阶段最大功率密度为2035.08 mW/m~3;在外接电压为0.5 V和0.8 V时,对MFC的电化学性能并没有明显的促进作用。对短暂外加电压对MFC反应器性能影响的持续性,具有参考价值。

In order to understand the effect of voltage on the performance of microbial fuel cells(MFC),this paper combines nitrate reduction and electrical stimulation to study the effect of short-term external voltage on the performance of MFC when nitrate wastewater is used as the catholyte.Studies have shown that applying an external voltage will affect the performance of the MFC during its stable operation,and this effect persists even after the voltage is removed.When the external voltage is 0.5,0.8,and 1.1 V,the degradation efficiency of the chemical oxygen demand of the MFC is improved,and the best applied external voltage is 1.1 V.Compared with the blank control group without external voltage,under the condition of 1.1 V,the chemical oxygen demand degradation efficiency of MFC,the current density and the nitrate removal efficiency during the stable power generation cycle are all improved.In the MFC reactor with a voltage of 1.1 V,the maximum power density is 2035.08 mW/m~3 during the stable power generation operation stage.When the external voltage is 0.5 V and 0.8 V,there is no obvious promotion effect on the electrochemical performance of MFC.The results of this study have reference values for the persistence of the impact of short-term applied voltage on the performance of the MFC reactor.