2025-07-11 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/chem/202507/t20250710_1047149.shtml
- https://pubs.acs.org/doi/10.1021/acs.est.5c05353
廃水有効化のための電気透析-還元を利用した硝酸塩の相乗的濃縮と変換 Electro-Dialysis-Reduction-Enabled Synergistic Nitrate Enrichment and Conversion for Wastewater Valorization
Tianyu Wang,Tonghui Bao,Xiaocong Ma,Wei Zhang,Zhenao Gu,Kenan Zhu,Chengzhi Hu,and Jiuhui Qu
Environmental Science & Technology Published: July 10, 2025
DOI:https://doi.org/10.1021/acs.est.5c05353
Abstract
Nitrate reduction (NO3–RR) is appealing for treating nitrate-containing wastewater and recovering nitrogen resources. However, it requires eight electrons and suffers from high energy consumption and low ammonia concentration, limiting its economic and practical feasibility. Producing and enriching ammonia in an electron-economical way is crucial. Herein, we integrate NO3–RR and electrodialysis in an electro-dialysis-reduction system. A single current circulation simultaneously drives ion migration for the nitrate concentration (desalination) and electron transfer for the NO3–RR, thereby achieving a 26.4% reduction in energy consumption. Moreover, enhanced nitrate removal and improved ammonia selectivity was realized by the synergistic effect between desalination and NO3–RR. The formation of *NOH, a crucial intermediate for ammonia generation, was verified by in situ differential electrochemical mass spectrometry. This study demonstrates the dual use of coupled ion migration and electron transfer as different charge carriers to achieve synergistic wastewater treatment and resource recovery, advancing industrial sustainability.
