摘要
抗生素和氯离子(Cl^(-))在市政污水中广泛存在,环境温度及pH随季节交替和原水水质不同而变化。本研究考察了不同环境温度和pH对污水中Cl^(-)强化过一硫酸盐(PMS)降解典型抗生素效能的影响。研究发现,在环境温度10~30℃范围内,PMS与Cl^(-)的二级反应速率常数在0.52×10^(-3)~2.33×10^(-3)(mol/L)^(-1)·s^(-1)之间;而初始pH从4.0升至10.0时,二级反应速率常数从1.97×10^(-3)(mol/L)^(-1)·s^(-1)降至0.65×10^(-3)(mol/L)^(-1)·s^(-1)。动力学模型和实验结果表明,次氯酸(HClO/ClO^(-))和单线态氧(^(1)O_(2))是Cl^(-)/PMS体系中主要活性物种。在Cl^(-)的作用下,PMS氧化典型抗生素磺胺嘧啶(SDZ)和土霉素(OTC)的降解效率明显提高,HClO/ClO^(-)在SDZ降解过程中起主导作用,而^(1)O_(2)是降解OTC的主要活性物种。此外,在二级出水有机质(EfOM)存在的Cl^(-)/PMS体系中,SDZ和OTC的降解均由^(1)O_(2)主导,PMS氧化过程中产生的含氯副产物浓度为0.99~16.97μg/L。在污水厂二级处理出水中,PMS氧化SDZ和OTC的降解率与环境温度的升高呈正相关,在pH为5.0~7.0时相对较高。
Antibiotics and chloride ions(Cl^(-))widely coexist in municipal wastewater,and the environmental temperature and pH fluctuate in response to seasonal changes and variations in water quality.This study aims to investigate the impact of varying environmental temperatures and pH on the efficiency of peroxymonosulfate(PMS)oxidation process enhanced by Cl^(-)in wastewater.The second-order reaction rate constants of PMS with Cl^(-)ranged from 0.52×10^(-3)to 2.33×10^(-3)(mol/L)^(1-)·s^(-1)within the temperature range of 10 to 30°C,and decreased from 1.97×10^(-3)to 0.65×10^(-3)(mol/L)^(1-)·s^(-1)as the initial pH increased from 4.0 to 10.0.The kinetic model and experimental results indicated that hypochlorous acid(HClO/ClO^(-))and singlet oxygen(^(1)O_(2))were major reactive oxygen species(ROS)in Cl^(-)/PMS system.The degradations of typical antibiotics,sulfadiazine(SDZ)and oxytetracycline(OTC),were significantly accelerated by Cl^(-).SDZ was primarily degraded by HClO/ClO^(-),while the degradation of OTC was predominantly attributed to^(1)O_(2).Furthermore,the presence of effluent organic matter(EfOM)resulted in^(1)O_(2)becoming the dominant ROS in the degradation of both SDZ and OTC.The concentrations of chlorinated by-products generated during SDZ and OTC oxidation were in the range of 0.99-16.97μg/L.In municipal secondary effluent,the degradation rates of SDZ and OTC exhibited a positive correlation with increasing environmental temperature and were relatively higher at pH 5.0-7.0.
作者
韦玉蕾
鲍杰
卢之琪
何相龙
崔双双
李洪静
WEI Yulei;BAO Jie;LU Zhiqi;HE Xianglong;CUI Shuangshuang;LI Hongjing(Department of Environmental Science and Engineering,Fudan University,Shanghai 200438,China;Suzhou New District Water Purification Co.,Ltd,Suzhou Jiangsu 215000,China)
出处
《复旦学报(自然科学版)》
北大核心
2025年第5期554-566,共13页
Journal of Fudan University:Natural Science
关键词
环境温度
PH
典型抗生素
氯离子
过一硫酸盐
污水厂二级处理出水
environmental temperature
pH
typical antibiotics
chloride ion
peroxymonosulfate
municipal secondary effluent
