Effects of conventional ozonation and electro-peroxone pretreatment of surface water on disinfection by-product formation during subsequent chlorination. (1st March 2018)

• Record Type: Journal Article
• Authors: Mao, Yuqin; Guo, Di; Yao, Weikun; Wang, Xiaomao; Yang, Hongwei; Xie, Yuefeng F.; Komarneni, Sridhar; Yu, Gang; Wang, Yujue
• Is Part Of: Water research. Volume 130(2018)
• Page Start: 322
• Page End: 332
• Publication Date: 2018-03-01
• Subjects: Bromate -- Chlorination -- Disinfection by-products -- Electrochemical advanced oxidation process -- HAAs -- THMs; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2017.12.019
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: 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 (H2 O2 ) 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 (O3 ) to hydroxyl radicals (OH) by electro-generated H2 O2, 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. Highlights: Both ozonation and E-peroxone can reduce THM and HAA formation during post-chlorination. E-peroxone leads to different DBP formation during water treatment trains compared to ozonation. Significantly less bromate is formed during E-peroxone of bromide-containing waters. Higher THM and HAA formation are observed during post-chlorination of E-peroxone treated waters.