Active chlorine mediated ammonia oxidation revisited: Reaction mechanism, kinetic modelling and implications

Water Research
Changyong ZhangT David Waite

Abstract

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 s...Continue Reading

Citations

Apr 24, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Jing DingQingliang Zhao
Sep 27, 2020·Ecotoxicology and Environmental Safety·Jiancheng ShuRenlong Liu
Jan 1, 2021·Journal of Hazardous Materials·Chengkai XiaJong Hyeok Park
Apr 4, 2021·International Journal of Environmental Research and Public Health·Angelo Earvin Sy ChoiJurng-Jae Yee
May 23, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Geletu QingLauren F Greenlee
Nov 22, 2018·Environmental Science & Technology·Changyong ZhangT David Waite
Dec 8, 2021·Environmental Science & Technology·Yiming SuDavid Jassby

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