The rate constants and degradation of selected pharmaceuticals in water ozonation
Date Issued
2016
Date
2016
Author(s)
Jiang, Yu-xun
Abstract
With the higher demand for personal health and better quality of life, the productions and usages of pharmaceuticals increased over the years. Because of the potential impacts on ecology and human health, the removal of pharmaceuticals from the aquatic environments is highly desirable. The effectiveness of removing pharmaceuticals from wastewater by conventional wastewater treatment processes has been found to be limited for some pharmaceuticals. Advanced oxidation processes such as ozonation have received more attentions to remove these compounds. With diverse functional groups in the structures, pharmaceuticals could potentially react directly with ozone, as well as react as the initiator, promoter and inhibitor in the OH radical chain reactions resulting from ozone decomposition, which have not been considered before. The purposes of this study are (1) to determine the rate constants of 6 selected pharmaceuticals in terms of direct ozone reaction, initiation, promotion and inhibition in ozonation; (2) to simulate the degradation of pharmaceuticals based on the determined rate constants. The results showed that the rate constants of 6 pharmaceuticals could be determined but the values are greater than the “lumped” rate constants reported in the literature. The model simulation predicted faster degradation than the experimental observations, which could be caused by the interferences causing by the intermediates formed during ozonation and background trace organics.
Subjects
Pharmaceuticals
ozone
OH radical
chain reactions
SDGs
Type
thesis
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