两类微生物燃料电池治理硝酸盐废水的实验研究

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3.77 mg·L-1·d-1.双室MFC...

Removing nitrate from wastewater in single and double-chamber microbial fuel cells

Simultaneous power generation and nitrate removal were investigated in a single chamber microbial fuel cell (MFC) and a double chamber MFC equipped with PbO2- coated air cathode. In both MFCs, glucose served as the sole substrate. Electrons extracted from glucose in the anode flew to the cathode through an external circuit, and subsequently transferred to nitrate via biological catalysis, resulting in nitrate reduction. In the double chamber MFC, average denitrifying rate was 3.77 mg•(L•day)-1. Maximal voltage and power density were obtained at 28mV and 6.89mW•m-2 respectively. Coulombic efficiency was 95%. In the single chamber MFC, the average denitrifying was 29.3 mg•(L•day)-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.