阳电极面积对双室微生物燃料电池产电性能及COD的影响

摘要

微生物燃料电池(MFC)最具应用前景之一是处理废水的同时能够产生电能.以糖蜜废水作为阳极基质,以金属离子的电镀废水做阴极溶液,研究了双室微生物燃料电池不同电极面积对产电性能和COD的影响.结果发现,当外电阻为300Ω时,小反应器微生物燃料电池(阳极面积为76.8cm2)及大反应器微生物燃料电池(阳极面积为78.15cm2)最大功率密度分别为0.22mW/cm2和0.28mW/cm2.在前200个小时内,小反应器微生物燃料电池在第60个小时时产生最大电压71.1 mV和最大电流189.5 μA,大反应器微生物燃料电池在第190个小时时产生最大电压81.1 mV和最大电流228.1μA.同时,当Zn2+作阴极溶液时,小反应器微生物燃料电池阳极溶液的COD去除率在1.5％到7.02％之间,大反应器微生物燃料电池阳极溶液的COD去除率在0到14.96％之间.%One of the most promising applications of MFC is to use them treating organic wastes while accomplishing power generation. In this study, we used the molasses wastewater and electroplating wastewater as the anode rnsolution and cathode solution, respectively. The effects of different electrode sizes on electricity generation performance and COD removal were investigated in double chambered MFC. It was found lhat the maximum power density of S - MFC (the electrode anode size is 76. 8 cm2 ) and L - MFC (the electrode anode size is 78. 15 cm2 ) , with the external resistor was 300Ω, were 0. 22mW/cm2 and 0. 28mW/cm2 , respectively. In the period of 0 -200 h operation, the S - MFC reached the maximum voltage 71.1 mV in 60 hours with the maximum current 189. 5 μA, while the L - MFC reached the maximum voltage 81. 1 mV in 190 hours with the current 228. 1 μA. Moreover, the anode solution COD removal of S - MFC ranged from 1. 5% to 7.02% using Zn2 + solution as the cathode and the anode solution COD removal in the L - MFC varied from 0 to 14. 96%.