[1]周冰洁,陈晗,林涛.UV/H2O2氧化丙氨酸对氯化中二氯乙腈生成的影响[J].中国给水排水,2022,38(9):52-57.
　ZHOUBing-jie,CHENHan,LINTao.Effect of UV/H2O2 Oxidation of Alanine on Formation of Dichloroacetonitrile in Chlorination[J].China Water & Wastewater,2022,38(9):52-57.
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UV/H2O2氧化丙氨酸对氯化中二氯乙腈生成的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第9期 页码: 52-57 栏目: 出版日期: 2022-05-01
Title:
Effect of UV/H2O2 Oxidation of Alanine on Formation of Dichloroacetonitrile in Chlorination
作者:
周冰洁1， 陈晗2， 林涛2
（1.南京市给排水工程设计院有限公司，江苏 南京 210036；2.河海大学 环境学院，江苏 南京 210098）
Author(s):
ZHOU　Bing-jie1， CHEN　Han2， LIN　Tao2
（1. Nanjing Water Supply and Drainage Engineering Design Institute Co. Ltd.， Nanjing 210036， China； 2. College of Environment， Hohai University， Nanjing 210098， China）
关键词:
紫外/过氧化氢;  丙氨酸;  氯化;  二氯乙腈
Keywords:
UV/H2O2;  alanine;  chlorination;  dichloroacetonitrile
摘要:
采用水处理过程中常用的紫外/过氧化氢（UV/H2O2）高级氧化工艺对水中典型的氨基酸——丙氨酸进行预处理，研究了后氯化过程中代表性含氮消毒副产物二氯乙腈的生成情况。研究发现，UV/H2O2工艺中产生的羟基自由基对丙氨酸进行α碳氢抽取和氨基氢抽取，在20 min反应时间内主要生成3种产物：HN=C（CH3）—COOH、CH3—CH=NH和CH3—C≡N，这3种产物相比丙氨酸具有更高的二氯乙腈生成势，因此强化了后氯化过程中二氯乙腈的生成。进一步研究UV/H2O2预处理时间、丙氨酸浓度、pH和水基质成分（HCO3-、Cl-、NO3-）对二氯乙腈生成势的影响，结果表明，随着UV/H2O2预处理时间从0增至30 min，二氯乙腈生成势先升高后降低，并在20 min时达到最大值；丙氨酸浓度的升高和pH的降低有利于二氯乙腈的生成；HCO3-和Cl-的存在会抑制二氯乙腈的生成，而NO3-对二氯乙腈的生成无明显影响。
Abstract:
UV/H2O2 advanced oxidation process, which is widely applied in water treatment, was employed for pretreatment of alanine (a typical amino acid in water), and the formation of dichloroacetonitrile (a representative nitrogenous disinfection by-product) in post-chlorination process was investigated. The hydroxyl radicals produced in UV/H2O2 process degraded alanine through α-carbon hydrogen abstraction and amino hydrogen abstraction, and mainly three products were produced in 20 min: HN=C(CH3)—COOH, CH3—CH=NH and CH3—C≡N. The three oxidation intermediates exhibited higher dichloroacetonitrile formation potential compared with that of alanine, thus enhanced the formation of dichloroacetonitrile during post-chlorination. The effects of UV/H2O2 pretreatment time, initial alanine concentration, pH and other components in water (e.g., HCO3-, Cl-, and NO3-) on the formation of dichloroacetonitrile were further investigated. When the UV/H2O2 pretreatment time was increased from 0 to 30 min, the formation potential of dichloroacetonitrile increased first and then decreased, and reached the maximum value at 20 min. The increase of alanine concentration and the decrease of pH were beneficial to the formation of dichloroacetonitrile. The presence of HCO3- and Cl- both inhibited the formation of dichloroacetonitrile, while the presence of NO3- had no significant effect on the formation of dichloroacetonitrile.
更新日期/Last Update: 2022-05-01