Effect of natural organic matter on the formation and consumption of OH radical and removal of emerging contaminants in ozonation
Date Issued
2015
Date
2015
Author(s)
Lin, Yi-Chen
Abstract
Ozonation has been widely used for removing organic contaminants in water treatment. The effect of natural organic matter (NOM) on this process, however, is not well understood due to the complex reactions of NOM with ozone and •OH generated from ozone decomposition. The objectives of this study are to determine the rate constants of NOM from different sources in terms of initiation, promotion, inhibition and direct ozone reactions in the ozonation process and to investigate the influences of NOM on the removal of emerging contaminants. The rate constants of NOM in four natural waters including Hsintien river (New Taipei City), Yilan river (Yilan City), Jinsha reservoir (Kinmen County) and Taichung groundwater (Taichung County) were determined using a recently developed approach that integrates the pseudo first order ozone decomposition kinetics, transient steady state •OH concentration and the Rct concept. The effects of pH value and temperature on the rate constants were also determined. With these rate constants, the influences of NOM on the degradation of three emerging contaminants including ibuprofen, acetylsulfamethoxazole and metoprolol can be fairly well predicted.
Subjects
ozone
Natural organic matter (NOM)
initiator
promoter and inhibitor
activation energy and emerging contaminants
Type
thesis
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