A comparative study of the effects of ozonation and TiOb>2b>-catalyzed ozonation on the selected chlorine disinfection by-product precursor content and structure

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• 作者：Jelena J. Molnar^a ; ^{jelena.molnar@dh.uns.ac.rs} ; Jasmina R. Agbaba^a ; Bo啪o D. Dalmacija^a ; Mile T. Kla&scaron ; nja^b ; Milena B. Dalmacija^a ; Marijana M. Kragulj^a
• 关键词：TiO2-catalyzed ozonation ; Advanced oxidation processes (AOPs) ; Natural organic matter ; Trihalomethanes ; Haloacetonitriles
• 刊名：Science of the Total Environment
• 出版年：2012
• 期刊代码：63_00489697
• 类别：env
• 出版时间：15 May, 2012
• 卷：425
• 期：Complete
• 页码：169-175
• 文件大小：616 K

摘要

This study compares the effects of ozonation (0.4-3.0 mg Ob>3b>/mg DOC) and TiOb>2b>-catalyzed ozonation 鈥?TiOb>2b>-Ob>3b> (0.4-3.0 mg Ob>3b>/mg DOC; 1.0 mg TiOb>2b>/L) at pH 6 on the content and structure of natural organic matter (NOM) and trihalometane (THM) and haloacetonitrile (HAN) precursors in groundwater. The investigated groundwater from Northern Serbia is rich in NOM (9.85 mg/L DOC) which is mostly of hydrophobic character (65%fulvic acid and 14%humic acid fraction). It was found that the TiOb>2b>-catalyzed process, by favoring the radical mechanism of NOM oxidation, resulted in a more effective reduction in the content of total NOM (up to 18%DOC) compared to ozonation alone (up to 6%DOC). The use of TiOb>2b> also resulted in an improvement of ozonation in terms of THM precursor content removal (up to 80%). On the other hand, the application of both oxidation treatments resulted in an increase in the HANFP compared to the raw water. NOM oxidation during ozonation and TiOb>2b>-Ob>3b> caused changes in their structure in the direction of an increased proportion of the hydrophilic fraction (up to 70%), which has the most reactive THM and HAN precursors, as well as the fraction with the highest content of their brominated species.