Developing surrogate indicators for predicting suppression of halophenols formation potential and abatement of estrogenic activity during ozonation of water and wastewater

WATER RESEARCH

卷:161

Article

Huang, Yu¹  Cheng, Shi¹  Wu, Ya-Ping¹  Wu, Ji¹  Li, Yan¹  Huo, Zong-Li²  Wu, Ji-Chun³  Xie, Xian-Chuan¹  Korshin, Gregory V.⁴  Li, Ai-Min¹  Li, Wen-Tao^1,3 

[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210023, Jiangsu, Peoples R China

[2] Jiangsu Prov Ctr Dis Control & Prevent, Nanjing 210023, Jiangsu, Peoples R China

[3] Nanjing Univ, Sch Earth Sci & Engn, Hydrosci Dept, Key Lab Surficial Geochem,Minist Educ, Nanjing 210023, Jiangsu, Peoples R China

[4] Univ Washington, Dept Civil & Environm Engn, Seattle, WA 98195 USA

关键词: Ozonation;    Dissolved organic matter;    Halophenol;    Endocrine disrupting chemical;    Surrogate indicator;    Haloacetic acids;   

DOI  :  10.1016/j.watres.2019.05.092

来源: Elsevier

【 摘 要 】

This study focused on developing surrogate indicators for predicting oxidation of phenolic groups in dissolved organic matter (DOM), suppression of halophenols' formation potential and abatement of estrogenic activity during ozonation of water and wastewater. The evolution of pH-dependent differential absorbance spectra suggests that O-3 preferentially reacts with the DOM phenolic moieties and less so with the aromatic carboxylic groups with increasing O-3/DOC (dissolved organic carbon) ratios and changes of UV absorbance and fluorescence. When ozonation used as pretreatment, the formation of halophenols in subsequent chlorination decreased linearly with increasing O-3 doses or changes of UV absorbance until it reached 85% suppression of the halophenols' formation from unaltered DOM. The thresholds of decreases of UVA254, UVA280 and humic-like fluorescence corresponding to 85% suppression of halophenols' formation were in the range of 25%-30%, 30%-35% and 30%-45%, respectively. Pre-ozonation also showed a moderate suppression of haloacetic acids (HAAS) formation potentials, <= 26.5% for reverse osmosis isolate of Suwannee River natural organic matter and <= 31.5% for Yangtze River at applied O-3 doses. Measurement of changes of estrogenic activity during ozonation of water and wastewater showed that to attain a >90% abatement of estrogenic activity, the corresponding thresholds of decreases of UVA254, UVA280 and humic-like fluorescence were similar to 30%, similar to 40%, and similar to 70%, respectively. Bromate formation was also suppressed to below 10 mu g/L before these thresholds. This study suggests that optimal ozonation conditions and a balance between control of disinfection byproducts (halophenols, HAAS and bromate) and elimination of estrogenic activity can be reached based on online data. (C) 2019 Elsevier Ltd. All rights reserved.

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