XIANGShuo,HU Xi-chao,HUANG Yi-ming,et al.Effect of Ozone and UV/H2O2 Preoxidation on DBPs Formation Derived from Saccharin during Chlorine Disinfection[J].China Water & Wastewater,2022,38(No.3):50-56.
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Effect of Ozone and UV/H2O2 Preoxidation on DBPs Formation Derived from Saccharin during Chlorine Disinfection

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: No.第3 Page: 50-56 Column: Date of publication: 2022-02-01
Author(s):
XIANG　Shuo1; 2;  HU Xi-chao3;  HUANG Yi-ming3;  SONG Ya-li1;  MA Xiao-yan3
（1. School of Civil Engineering and Architecture， Zhejiang University of Science and Technology， Hangzhou 310023， China； 2. College of Environment， Zhejiang University of Technology， Hangzhou 310014， China； 3. College of Civil Engineering， Zhejiang University of Technology， Hangzhou 310014， China）
Keywords:
UV/H2O2 preoxidation;  ozone preoxidation;  chlorine disinfection;  disinfection by?products;  saccharin;  synthetic organic matter
Abstract:
Preoxidation is an advanced treatment method for drinking water purification. Its goal is to reduce contamination caused by organic matters and their derived pollutants. However, some refractory organics are converted into small molecules after oxidation, which are more likely to react with chlorine, thereby increasing the risk of derivative disinfection by?products (DBPs) formation. Taking saccharin (SAC) as the model precursor, the effects of ozone and UV/H2O2 preoxidation on DBPs produced by synthetic organic compounds during chlorine disinfection were investigated by simulation test, and the variation of DBPs with water supply time was explored. Ozone and UV/H2O2 processes could convert chlorine?resistant SAC into small molecular organic compounds that could easily react with chlorine to produce more DBPs such as dichloracetic acid (DCAA), trichloracetic acid (TCAA), trichloromethane (TCM) and dichloracetonitrile (DCAN), and the content of haloacetic acid increased the most among all the DBPs. The formation potential of DBPs (DBPFP) increased firstly and then decreased with the increase of ozone and UV/H2O2 oxidation time, and the maximum DBPFP was obtained when the contact time was 15-20 min. When chlorine disinfection was applied in water supply for two consecutive days, the yield of TCM, DCAA, TCAA and DCAN increased gradually with contact time. Ozone and UV/H2O2 pre?oxidation had different degradation mechanisms and effects on precursors, but both of them changed the formation characteristics of DBPs derived from chlorine?resistant substances during chlorine disinfection. Therefore, improper selection of oxidation contact time and other process conditions may lead to an increased risk of DBPs generated by SAC.
Last Update: 2022-02-01