Abstract:

The single-chamber membrane-free microbial fuel cell(MFC) is constructed to investigate the simultaneous removal performance of organic carbon and ammonia nitrogen in the wastewater, which is prepared by using synthetic wastewater as substrate and municipal sludge as inoculum. The microbial electrolysis cell(MEC) is also employed to compare with the MFC. The maximum removal rates of organic carbon and NH₄⁺-N obtained in MFC are (97.5%±2.7%) and (54.9%±1.8%), respectively. A highest current density of (478.9±32.1) mA/L is achieved by MFC. Compared with MFC, MEC has a slightly higher organic carbon removal rate of (99.5%±0.8%). However, the NH₄⁺-N removal rate is at a low level with highest value of (10.2%±0.5%), much lower than MFC. The results can be explained by the following reason that the NH₄⁺-N removal in MEC is just accomplished by the metabolic demand of anaerobic microorganisms, while the function of partial nitrification and direct oxidation mainly contribute to the NH₄⁺-N removal in MFC.

Key words: microbial fuel cell, microbial electrolysis cell, organic carbon, NH₄⁺-N, wastewater treatment

摘要：

以人工合成废水为底物，市政污水厂污泥为接种物，建立单室无膜空气阴极微生物燃料电池（MFC），考察其对水中有机碳和NH₄⁺-N的同步去除性能，并建立微生物电解池（MEC）进行性能对比。结果表明，MFC系统可实现最大的有机碳和NH₄⁺-N去除率，分别为（97.5%±2.7%）和（54.9%±1.8%），最大产电效率为（478.9±32.1）mA/L。MEC系统最大有机碳去除率为（99.5%±0.8%），略高于MFC系统，但其NH₄⁺-N去除率很低，最高仅为（10.2%±0.5%），远低于MFC系统。这是因为MEC系统仅通过厌氧微生物的增殖代谢需求去除NH₄⁺-N，而MFC系统则通过部分硝化和直接氧化作用去除NH₄⁺-N。

关键词: 微生物燃料电池, 微生物电解池, 有机碳, 氨氮, 污水处理

CLC Number: 

• X703

• TM911.45