次氯酸钠对磺胺二甲氧嗪的降解与风险评价

丁朋飞; 陆金鑫; 汤慧俐; 郑璐; 杜尔登; 彭明国

doi:10.11835/j.issn.2096-6717.2021.184

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次氯酸钠对磺胺二甲氧嗪的降解与风险评价

环境工程 | 更新时间：2023-11-21

- 次氯酸钠对磺胺二甲氧嗪的降解与风险评价
- Degradation and risk assessment of sulfadimethoxine during sodium hypochlorite disinfection process
- 土木与环境工程学报 2023年45卷第6期页码：206-214
- 作者机构：
  
  常州大学环境与安全工程学院，江苏常州 213164
- 作者简介：
  
  丁朋飞（1995- ），男，主要从事水处理技术研究，E-mail：ding19850239681@163.com。
  郑璐（通信作者），女，博士，高级工程师，E-mail：zhenglu@cczu.edu.cn。
- 基金信息：
  
  常州市科技支撑计划(CE20185027);江苏省国际科技合作项目(BZ2018019);江苏省研究生科研与实践创新计划(SJCX21_1190)
- DOI：10.11835/j.issn.2096-6717.2021.184
  中图分类号： TU991.25;X522
- 收稿：2021-06-20，
  
  纸质出版：2023-12-25
- 稿件说明：
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丁朋飞,陆金鑫,汤慧俐等.次氯酸钠对磺胺二甲氧嗪的降解与风险评价[J].土木与环境工程学报,2023,45(06):206-214.

DING Pengfei,LU Jinxin,TANG Huili,et al.Degradation and risk assessment of sulfadimethoxine during sodium hypochlorite disinfection process[J].Journal of Civil and Environmental Engineering,2023,45(06):206-214.
丁朋飞,陆金鑫,汤慧俐等.次氯酸钠对磺胺二甲氧嗪的降解与风险评价[J].土木与环境工程学报,2023,45(06):206-214. DOI： 10.11835/j.issn.2096-6717.2021.184.

DING Pengfei,LU Jinxin,TANG Huili,et al.Degradation and risk assessment of sulfadimethoxine during sodium hypochlorite disinfection process[J].Journal of Civil and Environmental Engineering,2023,45(06):206-214. DOI： 10.11835/j.issn.2096-6717.2021.184.

摘要

自来水原水中新兴污染物的存在对饮用水水质安全提出新的挑战。采用氯消毒对典型磺胺类抗生素磺胺二甲氧嗪（Sulfadimethoxine，SDM）进行降解研究，考察余氯初始浓度、pH值、氨氮（NH

-N）等因素对降解的影响，探究SDM氯氧化降解机理，评估其生态风险。结果表明：在SDM初始浓度为15 μmol/L、余氯初始浓度为60 μmol/L的条件下，120 s内SDM去除率达到95.9%，降解过程符合准二级反应动力学。反应速率常数随着余氯初始浓度增大而增大，随着NH

-N浓度增大而减小，背景阴离子Cl

、NO

、SO

对反应影响甚微，HCO

、CO

对反应有抑制作用，中性条件下有利于SDM氯氧化反应。基于高分辨质谱HRMS Orbitrap解析出9种降解中间产物，降解过程中发生氯代反应、脱甲基反应和羟基加成反应等。在消毒过程中，SDM的完全去除并不意味着生态风险的有效削减，对饮用水水质安全构成潜在风险。

Abstract

The presence of emerging contaminants in the raw water puts forward new challenges to drinking water treatment process. The chlorination of typical sulfonamides antibiotic sulfadimethoxine (SDM) in the sodium hypochlorite disinfection process was studied. The chlorination effects

including the initial concentration of residual chlorine

the pH value of the solution

ammonia concentration

and the inorganic anions

were also investigated. The mechanism of SDM chlorination was explored and the ecological risk was further assessed. The results showed that

under the conditions of the initial SDM concentration 15 μmol/L

the initial concentration of residual chlorine 60 μmol/L

the SDM removal reached high up to 95.9% in 120 s. The degradation process conformed to the pseudo-second reaction kinetics. The constants of degradation rate decreased with the increasing ammonia concentration

and increased with the initial concentration of residual chlorine. Background anions Cl

had marginal effects on the reaction while HCO

and CO

had inhibition effects on the reaction. SDM chlorination can be improved under neutral conditions. Nine degradation intermediates are identified by using high-resolution mass spectrometry HRMS Orbitrap. The degradation process covers chlorination

demethylation and hydroxyl addition reactions. The complete removal of SDM does not imply an effective reduction of ecological risk during disinfection process which poses a potential risk to the safety of drinking water quality.

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references

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