华南理工大学学报(自然科学版) ›› 2017, Vol. 45 ›› Issue (11): 126-131.doi: 10.3969/j.issn.1000-565X.2017.11.018

• 环境科学与技术 • 上一篇    下一篇

温度、pH 值和水质条件对 UV/PS 光解 2,4 - DCP 的影响

陈菊香1,2 高乃云2† 杨静1 张梦文1   

  1. 1. 新疆大学 建筑工程学院,新疆 乌鲁木齐 830047; 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
  • 收稿日期:2017-02-20 修回日期:2017-08-23 出版日期:2017-11-25 发布日期:2017-10-01
  • 通信作者: 高乃云(1949-),女,博士,教授,主要从事水处理理论与技术研究. E-mail:gaonaiyun@126.com
  • 作者简介:陈菊香(1979-),女,副教授,主要从事水处理理论与技术研究. E-mail:chenyu1816@126.com
  • 基金资助:
    国家科技重大专项(2012ZX07403-001);国家自然科学基金资助项目(51768067);新疆大学大学生创新训练计 划项目(201610755018)

Effects of Temperature,pH Value and Water Conditions on 2,4-DCP Photolysis by UV/PS

CHEN Ju-xiang1,2 GAO Nai-yun2 YANG Jing1 ZHANG Meng-wen1   

  1. 1.College of Architecture and Civil Engineering,Xinjiang University,Urumqi 830047,Xinjiang,China; 2.State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China
  • Received:2017-02-20 Revised:2017-08-23 Online:2017-11-25 Published:2017-10-01
  • Contact: 高乃云(1949-),女,博士,教授,主要从事水处理理论与技术研究. E-mail:gaonaiyun@126.com
  • About author:陈菊香(1979-),女,副教授,主要从事水处理理论与技术研究. E-mail:chenyu1816@126.com
  • Supported by:
    Supported by the National Science and Technology Major Project(2012ZX07403-001) and the National Natural Science Foundation of China(51768067)

摘要: 考察了不同温度、pH 值和水质条件下紫外/过硫酸盐(UV/PS)工艺光解 2,4-二 氯苯酚(2,4-DCP)的效果及一级反应动力学,探讨了预氧化工艺对 2,4-DCP 在氯和氯胺 消毒过程中生成的消毒副产物的种类和产量的影响. 结果表明:UV/PS 光解 2,4-DCP 的 45min 降解率可达 86. 4%,说明 UV/PS 工艺可高效去除 2,4-DCP,且其反应基本遵循拟 一级反应动力学;不同温度下,2,4-DCP 的降解率随温度的升高而增大,反应符合拟一级 反应动力学及阿累尼乌斯公式拟合模型,线性较好;pH 值从 5. 0 上升到 9. 0 的过程中,反 应速率常数先逐渐增大再降低,在 pH = 7. 0 时达最大值;锡澄水库原水、油车水库原水、 自来水、锡东水厂水源配制的 2,4-DCP 溶液的降解率分别是 73. 5%、80. 2%、82. 4%、 87. 4%;PS、UV、UV/PS 3 种工艺降解 2,4-DCP 溶液时,后续氯和氯胺消毒过程中生成的 含碳消毒副产物是三氯甲烷、二氯乙酸、三氯乙酸,生成的含氮消毒副产物主要是二氯乙 腈和三氯硝基甲烷;UV、UV/PS 工艺较大程度地降低了 2,4-DCP 作为前体物生成的消毒 副产物的总量.

关键词: 光降解, 2, 4-二氯苯酚, 紫外/过硫酸盐工艺, 拟一级反应动力学, 温度, pH 值, 实际水体

Abstract: The degradation efficiency and first-order reaction kinetics of 2,4-DCP with UV/PS process at 25 ℃,under different temperature and different pH conditions were investigated; meanwhile, the intermediate products and the possible reaction pathways of 2, 4-DCP degradation by UV/PS were speculated. The types and yields of disinfection by-products generated by oxidizing 2,4-DCP with PS,UV and UV/PS during chlor(am)tion processes. The results showed that the removal rate of 2, 4-DCP can reach as high as 86.4 % with UV/PS process, which indicated 2, 4-DCP can be highly degradated by UV/PS, and the reaction fitted the pseudo-first-order reaction equation. The degradation rate increased with the increase of temperature, fitted the first-order reaction kinetics and Arrhenius formula fitting model, the linear were better. PH value increased from 5 to 9, and the reaction rate constant first increased and then decreased, which was the highest at pH=7.0. The actual water including of Xi-cheng reservoir, You-che reservoir, Xi-dong water works and tap water were prepared as the background of 2, 4-DCP solution ,the photo catalytic oxidation degradation efficiency of 2,4-DCP solution were 73.5%, 80.2%, 82.4% and 87.4%, respectively. three kinds of carbonaceous disinfection by-products containing chloroform(CF) , two chloroacetic acid (DCAA)and acetic acid(TCAA), two kinds of nitrogen disinfection by-products containing dichloroacetonitrile (DCAN) and trichloronitromethane (TCNM) were determined with GC-MS during degradation 2,4-DCP by PS,UV and UV/PS processes with chlor(am)ination process, the UV and UV/PS process can significantly reduce the total yields of DBPs caused by 2,4-DCP as the precursor.

Key words: photolysis, 2,4-dichlorophenol, ultraviolet/persulfate process, pseudo first-order kinetics, tempe- rature, pH value, actual water