Reduction of low-MW model compounds by ozonation and O3/UV processes
Journal
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Journal Volume
11
Journal Issue
1
Pages
20-27
Date Issued
2007
Author(s)
Abstract
In this investigation, the low-molecular-weight organic matters, such as resorcinol, phloroglucinol, and p-hydroxybenzoic acid, were selected as organic precursors during the ozonation and chlorination processes. The research work focused on evaluating the effects of hydroxyl radical and ozone molecule on the reduction of organic precursors and disinfection by-products (DBP) formation, and assessing the carcinogenic risk with respect to DBP formation potentials between ozonation and O3/UV processes. The two-stages ozone decomposition model, [O3]=[O3]0 {Fe-K1-t+(1-F) e-K2-t}, was developed throughout this investigation. In addition, a linear correlation between alkalinity and hydroxyl radical was found in the course of ozonation process. The destruction of organic precursors by hydroxyl radical exhibits better performance than that by ozone. According to the risk assessment on the ozonation process, water samples treated by the O3/UV and O3 (pH 5) process exhibit the lower risk. Therefore, both the O3/UV and ozonation processes with proper operation can reduce the organic precursors, thereby providing safe drinking water. © 2007 ASCE.
Subjects
Chlorination; Organic matter; Ozonization; Risk management
SDGs
Other Subjects
Alkalinity; Chlorination; Disinfection; Molecular weight; Ozonization; Risk assessment; Risk management; Hydroxyl radical; Organic matter; Organic precursors; Ozone molecule; Water treatment; Alkalinity; Chlorination; Disinfection; Molecular weight; Ozonization; Risk assessment; Risk management; Water treatment; carcinogen; chemical compound; hydroxyl radical; molecular analysis; organic matter; reduction; risk assessment
Type
journal article