WANG Xiao-yun,FU Ai-min.Formation of Inorganic Disinfection By-products during Chlorine Dioxide Pre-oxidation[J].China Water & Wastewater,2021,37(23 23):34-39.
Formation of Inorganic Disinfection By-products during Chlorine Dioxide Pre-oxidation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
23 23
Page:
34-39
Column:
Date of publication:
2021-12-01
- Keywords:
- chlorine dioxide; pre-oxidation; inorganic disinfection by-product; bromine ion; humic acid; chlorate; chlorite
- Abstract:
- To explore the pre-oxidation of different synthetic water samples by chlorine dioxide and the effect of chlorine dioxide on formation of inorganic disinfection by-products (IDBPs), effects of various reaction parameters on oxidation of humic acid (HA) in simulated water by chlorine dioxide and formation of IDBPs were investigated under different acid-base conditions. In addition, the competitive effect of different bromine concentration and HA concentration on chlorine dioxide oxidation was analyzed, and the influence of bromine ion on variation trend of IDBPs species was investigated.The results showed that the degradation of chlorine dioxide in water was affected by acidic and alkaline water conditions.The acidic water condition was favorable to the formation of chlorine ion, whereas the alkaline condition was favorable to the formation of chlorite ion.The presence of organic matter catalyzed the formation of IDBPs. In pure water, only no more than 38% of chlorine dioxide reacted to generate IDBPs because of degradation reaction of chlorine dioxide, while about 80%-95% of chlorine dioxide reacted to generate IDBPs after catalyzed by organic matter. After the addition of bromine ions, the reduction of bromine ions indicated that the chlorine dioxide or its hydrolysis intermediate would oxidize bromine ions. However, no bromate ions were formed, and the consumption of residual chlorine by bromine ions slowed the degradation rate of the chlorine dioxide in pure water.When HA was present, chlorite production per unit chlorine dioxide consumption decreased with the increase of bromine ion concentration, and the phenomena was more obvious specially at alkaline condition.
Last Update:
2021-12-01