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Characterization of Oxidation processes: ozonation and the AOP O 3 /H 2 O 2
Author(s) -
Acero Juan L.,
Von Gunten Urs
Publication year - 2001
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.2001.tb09311.x
Subject(s) - chemistry , radical , alkalinity , ozone , decomposition , hydrogen peroxide , organic matter , hydroxyl radical , natural organic matter , reaction rate constant , environmental chemistry , kinetics , organic chemistry , physics , quantum mechanics
The influence of water quality parameters (dissolved organic matter and alkalinity) on the efficiency of the ozone/hydrogen peroxide (O 3 /H 2 O 2 ) advanced oxidation process (AOP) relative to the corresponding conventional ozonation process was investigated. In natural waters with a high natural organic matter content (≥3 mg/L), O 3 decomposition is controlled by radical‐type chain reactions. Thus, the overall OH radical oxidation capacity is nearly independent if conventional ozonation is replaced by O 3 /H 2 O 2 AOP. In contrast, when the organic matter content in the natural water is low (≤1 mg/L), the addition of H 2 O 2 considerably enhances the oxidation capacity by OH radicals. A constant ratio between the OH radical and O 3 concentration ( R ct ) was found during both treatments, making it possible to predict the oxidation of micropollutants with O 3 and OH radicals if the rate constants of both oxidants are known. The oxidation of atrazine during ozonation and the combined process O 3 /H 2 O 2 could be accurately predicted in natural waters.