[1]李冕,杨丹,张天阳,等.不同离子对Dinoseb氯化降解及消毒副产物生成的影响[J].中国给水排水,2021,37(3):45-51.
　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):45-51.
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不同离子对Dinoseb氯化降解及消毒副产物生成的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷 期数: 2021年第3期 页码: 45-51 栏目: 出版日期: 2021-02-01
Title:
Effect of Different Ions on Chlorination Degradation of Dinoseb and Formation of Disinfection By-products
作者:
李冕1,2,3，杨丹1，张天阳2,3，董正玉2,3，杨智1，文双喜1
(1.贵阳学院生物与环境工程学院，贵州贵阳550005；2.同济大学污染控制与资源化研究国家重点实验室，上海200092；3.同济大学长江水环境教育部重点实验室，上海200092)
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)
关键词:
地乐酚; 氯化; 消毒副产物; 离子浓度; 动力学
Keywords:
dinoseb; chlorination; disinfection by-products; ion concentration; kinetics
摘要:
以水体中常见的污染物地乐酚（Dinoseb）为研究对象，分析了水中4种不同离子（Br-、NH4+、NO3-、NO2-）背景浓度下Dinoseb氯化动力学及生成消毒副产物（DBPs）的情况。结果表明，4种离子对Dinoseb氯化反应的影响顺序为：Br-＞NH4+＞NO2-＞NO3-。产生的消毒副产物主要有三氯甲烷（CF）、三氯硝基甲烷（TCNM）、二氯乙腈（DCAN）、三氯丙酮（TCP）、二氯一溴甲烷(DCBM)等，其中TCNM浓度最高，Dinoseb是TCNM的典型前体物。当水中有Br-存在时，Dinoseb降解反应非常复杂，降解速率不符合拟一级反应规律，还会产生大量溴代THMs，如二氯一溴甲烷(DCBM)、一氯二溴甲烷(DBCM)、三溴甲烷(TBM)等，它们的浓度均随着Br-/Cl2值的增加而迅速增加，浓度高低顺序为：DCBM>DBCM>TBM>CF。在相同pH值下，Dinoseb的氯化降解速率随着Br-浓度的增大而增加；在相同Br-浓度下，pH值越低，Dinoseb的氯化反应速率越快。与Br-相比，pH值是更重要的氯化速率影响因素。当水体中有NH4+存在时，TCNM产率会提高较多；NO3-对Dinoseb的氯化反应有一定的抑制作用，各DBPs浓度都有降低；NO2-可以被水中的次氯酸氧化成NO3-，消耗水中部分次氯酸，DBPs浓度总体都会降低。
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.

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更新日期/Last Update: 2021-02-01