School of Civil Engineering Architecture, East China Jiao Tong University, Nanchang, 330013, Jiangxi, China.
Department of Environmental Engineering, Laboratory of Electrochemistry and Energy Storage; State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310058, China.
Environ Sci Pollut Res Int. 2023 Aug;30(37):87998-88008. doi: 10.1007/s11356-023-28579-6. Epub 2023 Jul 11.
Excessive discharge of ammonia nitrogen would deteriorate water quality. In this work, we designed an innovative microfluidic electrochemical nitrogen-removal reactor (MENR) based on a short-circuited ammonia-air microfluidic fuel cell (MFC). The MENR utilizes the laminar characteristics of two flows (an anolyte containing nitrogen-rich wastewater and a catholyte of acid electrolyte solution) in a microchannel to establish an efficient reactor system. At anode, ammonia was catalyzed by a NiCu/C modified electrode to N, while O in the air was reduced at cathode. In essence, the MENR reactor is a short-circuited MFC. Maximum discharge currents were achieved accompanied with strong ammonia oxidation reaction. Factors indicating electrolyte flow rate, initial nitrogen concentration, electrolyte concentration, and electrode geometry have various effects on the nitrogen removal performance of the MENR. Results indicate that the MENR showed efficient nitrogen removal properties. This work proposes an energy-saving process by using the MENR to remove nitrogen from ammonia-rich wastewater.
过量的氨氮排放会恶化水质。在这项工作中，我们设计了一种基于短路氨-空气微流体燃料电池（MFC）的创新微流体电化学脱氮反应器（MENR）。MENR 利用微通道中两种流（含氮丰富的废水的阳极液和酸性电解质溶液的阴极液）的层流特性来建立高效的反应系统。在阳极，氨在 NiCu/C 修饰电极的催化作用下转化为 N，而空气中的 O 在阴极被还原。从本质上讲，MENR 反应器是一种短路 MFC。最大放电电流伴随着强烈的氨氧化反应得以实现。表明电解质流速、初始氮浓度、电解质浓度和电极几何形状的因素对 MENR 的脱氮性能有不同的影响。结果表明，MENR 表现出高效的脱氮性能。这项工作提出了一种节能工艺，即使用 MENR 从富含氨的废水中去除氮。
