期刊
WATER RESEARCH
卷 130, 期 -, 页码 322-332出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2017.12.019
关键词
Bromate; Chlorination; Disinfection by-products; Electrochemical advanced oxidation process; HAAs; THMs
资金
- National Special Program of Water Pollution Control and Management [201707ZX202]
- State Key Joint Laboratory of Environment Simulation and Pollution Control [16Y03ESPCT]
- Tsinghua University Initiative Scientific Research Program [20141081174]
The electro-peroxone (E-peroxone) process is an emerging ozone-based electrochemical advanced oxidation process that combines conventional ozonation with in-situ cathodic hydrogen peroxide (H2O2) production for oxidative water treatment. In this study, the effects of the E-peroxone pretreatment on disinfection by-product (DBP) formation from chlorination of a synthetic surface water were investigated and compared to conventional ozonation. Results show that due to the enhanced transformation of ozone (O-3) to hydroxyl radicals (center dot OH) by electro-generated H2O2, the E-peroxone process considerably enhanced dissolved organic carbon (DOC) abatement and significantly reduced bromate (BrO3-) formation compared to conventional ozonation. However, natural organic matter (NOM) with high UV254 absorbance, which is the major precursors of chlorination DBPs, was less efficiently abated during the E-peroxone process than conventional ozonation. Consequently, while both conventional ozonation and the E-peroxone process substantially reduced the formation of DBPs (trihalomethanes and haloacetic acids) during post-chlorination, higher DBP concentrations were generally observed during chlorination of the E-peroxone pretreated waters than conventional ozonation treated. In addition, because of conventional ozonation or the E-peroxone treatment, DBPs formed during post-chlorination shifted to more brominated species. The overall yields of brominated DBPs exhibited strong correlations with the bromide concentrations in water. Therefore, while the E-peroxone process can effectively suppress bromide transformation to bromate, it may lead to higher formation of brominated DBPs during post-chlorination compared to conventional ozonation. These results suggest that the E-peroxone process can lead to different DBP formation and speciation during water treatment trains compared to conventional ozonation. (C) 2017 Elsevier Ltd. All rights reserved.
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