Enhanced Electrolytic Removal of Ammonia from the Aqueous Phase with a Zeolite-Packed Electrolysis Reactor under a Continuous Mode
Publication: Journal of Environmental Engineering
Volume 141, Issue 2
Abstract
This research investigated the mechanism and effect of influencing factors for aqueous ammonia removal by electrolysis in continuous mode with a zeolite-packed electrolysis reactor. Under the conditions of 30-min hydraulic retention time (HRT), 1.8-A current, and chloride ion concentration, the ammonia concentration decreased from 25 to within 1.5 h electrolysis time. A total of nitrate, nitrite, and chloramines were detected in effluent, which accounted for 76% removal of total nitrogen from the aqueous phase. Moreover, the ammonia-presaturated zeolite was almost completely regenerated during the same time period. HRT, current, and chloride ion concentration were found to have a significant effect on ammonia removal as well as zeolite regeneration. Whereas other conditions were fixed, a minimum of 10-min HRT, 1.0-A current, and chloride ion concentration were required to keep the effluent ammonia concentration below . For the treatment of municipal wastewater, minimum HRTs of 7.5, 11, and 21 min were suggested for initial ammonia concentrations of 13.5, 30.2, and under the conditions of chloride and 1.8-A current.
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Acknowledgments
The authors would like to thank the National Natural Science Foundation of China (No. 51208299), Science & Technology Commission of Shanghai Municipality (No. 11JC1408700), and the Chen Guang project supported by the Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No. 11CG52) for funding support.
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 2 • February 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 27, 2013
Accepted: Jul 17, 2014
Published online: Aug 18, 2014
Discussion open until: Jan 18, 2015
Published in print: Feb 1, 2015
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