A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Kinetic Study of Humic Acid Ozonation in Aqueous Media
10.1002/clen.200800025.abs
A pseudo first‐order kinetic model that describes the ozonation of two sources of humic acid (HA) in aqueous media is developed and investigated in a semi‐batch system. Further investigation shows that the degradation rates of the two HAs are highly dependent on the initial pH, temperature of the ozonation, the source of HA, and the overall kinetic rate constant, which is mainly composed of two parts, i. e., direct oxidation by molecular ozone and indirect oxidation by hydroxyl radicals (•OH). The contributions of the two pathways to HA ozonation can be traced using tert‐butanol as the radical scavenger at different pH values (3, 7, and 11), temperatures (283–303 K), and the results show that •OH oxidation is more sensitive to the operating variables than molecular ozone oxidation and exerts a contribution of ca. 50 to 60% on the overall reaction at the different operating parameters. Furthermore, the direct molecular ozone oxidation rate constant is correlated with temperature by a modified Arrhenius equation with an activation energy,Ea, of 33.57 kJ mol–1.
Kinetic Study of Humic Acid Ozonation in Aqueous Media
10.1002/clen.200800025.abs
A pseudo first‐order kinetic model that describes the ozonation of two sources of humic acid (HA) in aqueous media is developed and investigated in a semi‐batch system. Further investigation shows that the degradation rates of the two HAs are highly dependent on the initial pH, temperature of the ozonation, the source of HA, and the overall kinetic rate constant, which is mainly composed of two parts, i. e., direct oxidation by molecular ozone and indirect oxidation by hydroxyl radicals (•OH). The contributions of the two pathways to HA ozonation can be traced using tert‐butanol as the radical scavenger at different pH values (3, 7, and 11), temperatures (283–303 K), and the results show that •OH oxidation is more sensitive to the operating variables than molecular ozone oxidation and exerts a contribution of ca. 50 to 60% on the overall reaction at the different operating parameters. Furthermore, the direct molecular ozone oxidation rate constant is correlated with temperature by a modified Arrhenius equation with an activation energy,Ea, of 33.57 kJ mol–1.
Kinetic Study of Humic Acid Ozonation in Aqueous Media
Miao, Hengfeng (author) / Tao, Wenyi (author) / Cui, Fengjie (author) / Xu, Zhenghong (author) / Ao, Zonghua (author)
CLEAN – Soil, Air, Water ; 36 ; 893-899
2008-11-01
7 pages
Article (Journal)
Electronic Resource
English
Kinetic Study of Humic Acid Ozonation in Aqueous Media
| Online Contents | 2008
A Kinetic Study on the Decolorization of Aqueous Solutions of Acid Red-151 by Ozonation
| Online Contents | 2003
Kinetic Modelling of Aqueous Trichloroethylene Direct Ozonation in a Continuous Agitated Tank
| Online Contents | 1997
Treatment of humic surface water at cold temperatures by ozonation and biofiltration
| British Library Conference Proceedings | 2002