【摘要】 采用二氧化铅阴极单室微生物燃料电池(MFC)和双室MFC,以葡萄糖为唯一电子供体,系统研究了两类微生物燃料电池的产电性能和去除硝酸盐的情况.结果表明,双室MFC闭合后,阳极室降解葡萄糖产生的电子可通过外电路传递到阴极,在生物的作用下,NO3-N得到电子被还原,平均反硝化速率达3.77mg·L-.1d-1.双室MFC在外电阻为30Ω时获得的最大输出电压为28mV,最大功率密度为6.89mW.m-2,库伦效率达95%.MFC能促进生物反硝化过程的进行.单室MFC在外电阻为1000Ω的条件下,平均反硝化速率可达29.3mg·L-1.d-1.硝酸盐(52.75mg·L-1)的存在对MFC的最大电压输出没有明显影响,但对功率密度和库伦效率影响较大,使其分别降低了50%和41%.生物反硝化过程与电子的传递过程存在竞争关系.更多还原

【Abstract】 Simultaneous power generation and nitrate removal were investigated in a single chamber microbial fuel cell (MFC) and a double chamber MFC equipped with a PbO2-coated air cathode. In both MFCs,glucose served as the sole substrate. Electrons extracted from glucose in the anode traveled to the cathode through an external circuit,and subsequently transferred to nitrate via biological catalysis,resulting in nitrate reduction. In the double chamber MFC,the average denitrifying rate was 3.77 mg·L-1·d-1. Maximal voltage and power density were obtained at 28 mV and 6.89 mW·m-2 respectively. Coulombic efficiency was 95%. In the single chamber MFC,the average rate of denitrification was 29.3 mg·L-1·d-1. The presence of nitrate (52.75 mg·L-1) showed no influence on the maximum voltage output; however,it decreased the power density and Coulombic efficiency by 50% and 41% respectively,indicating a possible competition between electricity generation and denitrification in a single chamber MFC.更多还原