[1]李冕,秦朗,杨丹,等.UV降解碘海醇及其I-THMs生成特性[J].中国给水排水,2024,40(9):91-97.
　LIMian,QINLang,YANGDan,et al.Ultraviolet for Degradation of Iohexol and Its Iodinated Trihalomethanes Formation Characteristics[J].China Water & Wastewater,2024,40(9):91-97.
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UV降解碘海醇及其I-THMs生成特性

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期数: 2024年第9期 页码: 91-97 栏目: 出版日期: 2024-05-01
Title:
Ultraviolet for Degradation of Iohexol and Its Iodinated Trihalomethanes Formation Characteristics
作者:
李冕1， 秦朗2， 杨丹1， 张天阳2， 胡晨燕3， 徐斌2
（1.贵阳学院 生物与环境工程学院，贵州 贵阳 550005；2.同济大学 环境科学与工程学院，上海 200092；3.上海电力大学 环境与化学工程学院，上海 201306）
Author(s):
LI　Mian1， QIN　Lang2， YANG　Dan1， ZHANG　Tian-yang2， HU　Chen-yan3， XU　Bin2
（1. College of Biological and Environmental Engineering， Guiyang University， Guiyang 550005， China； 2. College of Environmental Science and Engineering， Tongji University， Shanghai 200092， China； 3. College of Environmental and Chemical Engineering， Shanghai University of Electric Power， Shanghai 201306， China）
关键词:
紫外光;  碘海醇;  碘代消毒副产物;  氯化
Keywords:
ultraviolet;  iohexol;  iodinated disinfection by-products;  chlorination
摘要:
开展了UV降解碘海醇及后续氯化生成碘代三卤甲烷（I-THMs）特性的研究，考察了消毒副产物（DBPs）的分布情况及不同影响因素（紫外光强、pH、Br-浓度）对碘海醇降解和I-THMs生成的影响，同时探究了其在实际水体中的变化规律。结果表明，UV降解碘海醇的降解速率与紫外光强呈正相关，与原水水质成分复杂程度呈负相关，受pH和Br-浓度的影响不大。体系中生成的DBPs包括氯仿（CF）、水合氯醛（CH）、二氯乙腈（DCAN）、三氯硝基甲烷（TCNM）以及3种I-THMs（CHCl2I、CHClI2、CHI3），CF浓度最高，其次是CHCl2I。I-THMs的生成量随着UV辐照量及pH的升高均先升高后降低，分别在UV辐照量为2 670 mJ/cm2和pH为7时达到最大值。随着Br-浓度的增加，CHI3浓度不断升高，3 种含溴的I?THMs（CHBrI2、CHBr2I和CHClBrI）组分所占比例也逐渐升高，但两种含氯的I-THMs（CHCl2I和CHClI2）组分所占比例却逐渐下降。水质成分更复杂的原水2生成的总I-THMs浓度高于原水1。与纯水相比，两种原水都生成了3 种含溴的I-THMs，但3 种不含溴的I-THMs（CHCl2I、CHClI2和CHI3）在I-THMs总量中仍占主要部分，且比纯水背景下的生成浓度要高。水中的天然有机物（NOM）能够促进I-THMs的生成。
Abstract:
This paper investigated the performance of ultraviolet (UV) for degradation of iohexol and the characteristics of iodinated trihalomethanes (I-THMs) formation, explored the distribution of disinfection by-products (DBPs) as well as the effects of UV intensity, pH and Br- concentration on the degradation of iohexol and I-THMs formation, and revealed the changes of DBPs in actual water bodies. The degradation rate of iohexol was positively correlated with UV intensity and negatively correlated with the complexity of raw water composition, and was little affected by pH and Br- concentration. The DBPs produced in the system included chloroform (CF), chloral hydrate (CH), dichloroacetonitrile (DCAN), trichloronitromethane (TCNM) and three kinds of I-THMs (CHCl2I、CHClI2、CHI3) among which CF concentration was the highest, followed by CHCl2I. The I-THMs production initially increased and then decreased with the increase of UV intensity and pH, and reached the maximum value when UV intensity was 2 670 mJ/cm2 and pH was 7. With the increase of Br- concentration, the concentration of CHI3 increased continuously, and the proportion of three bromine-containing I-THMs (CHBrI2, CHBr2I and CHClBrI) gradually increased, whereas the proportion of two chlorine-containing I-THMs (CHCl2I and CHClI2) gradually decreased. The No.2 raw water sample with more complex water composition produced a higher concentration of I-THMs than the No.1 raw water sample. Compared with pure water, three bromine-containing I-THMs were generated in both raw water samples, but the three bromine-free I-THMs (CHCl2I, CHClI2 and CHI3) still accounted for the main part of the total I-THMs, and their concentrations were higher than that generated under the background of pure water. Natural organic matter (NOM) in water promoted the formation of I-THMs.
更新日期/Last Update: 2024-05-01