期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 23, 页码 17298-17309出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c06033
关键词
packed flow cathode; nitrate electroreduction; ammonia; copper-loaded activated carbon
资金
- EMU
- MWAC UNSW
This study demonstrates the efficacy of a novel flow cathode system coupled with ammonia stripping for effective nitrate removal and ammonia generation and recovery. It provides a new approach for simultaneously treating nitrate in wastewater and producing ammonia.
The presence of excessive concentrations of nitrate in industrial wastewaters, agricultural runoff, and some ground waters constitutes a serious issue for both environmental and human health. As a result, there is considerable interest in the possibility of converting nitrate to the valuable product ammonia by electrochemical means. In this work, we demonstrate the efficacy of a novel flow cathode system coupled with ammonia stripping for effective nitrate removal and ammonia generation and recovery. A copper-loaded activated carbon slurry (Cu@AC), made by a simple, low-cost wet impregnation method, is used as the flow cathode in this novel electrochemical reactor. Use of a 3 wt % Cu@AC suspension at an applied current density of 20 mA cm-2 resulted in almost complete nitrate removal, with 97% of the nitrate reduced to ammonia and 70% of the ammonia recovered in the acid-receiving chamber. A mathematical kinetic model was developed that satisfactorily describes the kinetics and mechanism of the overall nitrate electroreduction process. Minimal loss of Cu to solution and maintenance of nitrate removal performance over extended use of Cu@AC flow electrode augers well for long-term use of this technology. Overall, this study sheds light on an efficient, low-cost water treatment technology for simultaneous nitrate removal and ammonia generation and recovery.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据