LI Mian,YANG Dan,ZHANG Tian-yang,et al.Effect of Different Ions on Chlorination Degradation of Dinoseb and Formation of Disinfection By-products[J].China Water & Wastewater,2021,37(3 3):45-51.
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Effect of Different Ions on Chlorination Degradation of Dinoseb and Formation of Disinfection By-products

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 3 3 Page: 45-51 Column: Date of publication: 2021-02-01
Author(s):
LI Mian1; 2; 3; YANG Dan1; ZHANG Tian-yang2; 3; DONG Zheng-yu2; 3; YANG Zhi1; WEN Shuang-xi1
(1. College of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China; 2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China; 3. Key Laboratory of Yangtze River Water Environment , Tongji University, Shanghai 200092, China)
Keywords:
dinoseb; chlorination; disinfection by-products; ion concentration; kinetics
Abstract:
Chlorination kinetics of dinoseb(a common pollutant in water bodies) and disinfection byproducts (DBPs) formation were analyzed under background concentrations of four different ions (（Br-，NH4+，NO3- and NO2-）).The order of four ions influencing dinoseb chlorination reaction from strong to weak was as follows:（Br-，NH4+，NO2- and NO3-）.The main DBPs generated were trichloromethane (CF), trichloronitromethane (TCNM), dichloroacetonitrile (DCAN), trichloroacetone(TCP), dichloromethane (DCBM), etc. Among them, the concentration of TCNM was the highest, and dinoseb was a typical precursor of TCNM.When Br- existed in the water, the degradation reaction of dinoseb was very complex, and the degradation rate did not conform to pseudo-first-order reaction model. In addition, various bromination nitromethane emerged, such as DCBM, dibromochloromethane (DBCM) and tribromomethane (TBM). Their concentrations increased rapidly with the increase of Br-/Cl2 value, and the order of concentration from high to low was DCBM, DBCM, TBM and CF.The chlorination rate increased with the increase of Br- concentration at the same pH. If the same initial dosages of Br- were applied, the faster degradation rates of dinoseb were found at lower pH.Compared with Br-, pH was a more important factor affecting the chlorination rate.When there was NH4+ in the water, the yield of TCNM increased greatly. NO3- had a certain inhibitory effect on chlorination of dinoseb, and the concentrations of DBPs were slightly reduced. NO2- could be oxidized to NO3- by HOCl,which consumed part of HOCl, and the concentrations of DBPs decreased overall.
Last Update: 2021-02-01