DOI: 10.1016/j.watres.2018.08.025
Scopus记录号: 2-s2.0-85053050325
论文题名: Active chlorine mediated ammonia oxidation revisited: Reaction mechanism, kinetic modelling and implications
作者: Zhang C. ; He D. ; Ma J. ; Waite T.D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 220
结束页码: 230
语种: 英语
英文关键词: Active chlorine
; Ammonia oxidation
; Electrochemical advanced oxidation process
; Kinetic model
Scopus关键词: Ammonia
; Anodes
; Anodic oxidation
; Chlorine compounds
; Electric discharges
; Electrooxidation
; Energy utilization
; Eutrophication
; Kinetic parameters
; Kinetic theory
; Nitrogen removal
; Wastewater treatment
; Water supply
; Active chlorine
; Ammonia nitrogen removal
; Ammonia oxidation
; Chloride concentrations
; Electro-oxidation process
; Electrochemical advanced oxidation process
; Environmental problems
; Kinetic modeling
; Chemicals removal (water treatment)
; ammonium
; chlorine
; concentration (composition)
; discharge
; disinfection
; electrochemistry
; nitrogen
; oxidation
; pollutant removal
; reaction kinetics
; wastewater treatment
英文摘要: Ammonia nitrogen removal from wastewaters has gained much attention in recent decades as a result of the environmental problems associated with discharge of excessive amounts of this critical nutrient including eutrophication of receiving waters, generation of offensive odours as a result of organism decay and complications associated with the disinfection of water supplies. While removal via biological processes represents the principal means by which a reduction in dissolved nitrogen concentrations is achieved, an electrochemical advanced oxidation process has been proposed as a potentially effective alternate means of removing ammonia from wastewaters with the removal associated with the in situ generation of oxidants (particularly active chlorine) at the anode. Here we describe the influence of key factors on the rate and extent of ammonia nitrogen removal in an electrochemical cell with a Ti/IrO2-RuO2 anode and Ti cathode. The rate of ammonia removal was found to be dependent on both current density and initial chloride concentration with ∼95% ammonia removed from a 20 mM Cl− solution within approximately 40 min at a current density of 3 mA cm−2, resulting in an energy consumption of 126 kWh kg−1 NH4 +-N. Additionally, we show that by-products formation is effectively suppressed during the electrolysis process. A mechanistically-based kinetic model incorporating the key processes operating in the ammonia electro-oxidation process was developed with particular attention given to (i) anodic generation of active chlorine and other chloride-related by-products, (ii) active chlorine mediated ammonia oxidation. The results demonstrate that the electrochemical advanced oxidation process is a promising technology for treatment of ammonia-containing wastewaters with advantages including simplicity, safety and effectiveness. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112418
Appears in Collections: 气候减缓与适应
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作者单位: School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia; Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
Recommended Citation:
Zhang C.,He D.,Ma J.,et al. Active chlorine mediated ammonia oxidation revisited: Reaction mechanism, kinetic modelling and implications[J]. Water Research,2018-01-01,145