氯
化学
单线态氧
羟基自由基
无机化学
反应速率常数
污染物
氯化物
腐植酸
激进的
动力学
降级(电信)
水处理
光化学
环境化学
有机化学
氧气
环境工程
肥料
计算机科学
工程类
物理
电信
量子力学
作者
Jiaqi Ding,Hui Nie,Songlin Wang,Yongsheng Chen,Ying Wan,Jingwen Wang,Haoliang Xiao,Siyang Yue,Jun Ma,Pengchao Xie
出处
期刊:Water Research
[Elsevier]
日期:2021-02-01
卷期号:189: 116605-116605
被引量:50
标识
DOI:10.1016/j.watres.2020.116605
摘要
With the fast development of peroxymonosulfate (PMS)-dominating processes in drinking water and wastewater treatment, residual PMS is easy to come across chlorine as these processes are usually followed by secondary chlorine disinfection. The synergistic effect of PMS and chlorine on the degradation of micro-organic pollutants is investigated by selecting acetaminophen (ACT) as a reference compound for the first time in this study. Unlike conventional PMS or chlorine activation which generates reactive species such as hydroxyl radical (HO•), sulfate radical (SO4•−), chlorine radical (Cl•), and singlet oxygen (1O2), the efficient ACT removal is attributed to the direct catalytic chlorination by PMS due to the significantly enhanced consumption of chlorine along with negligible change of PMS concentration at neutral condition, and the same reaction pathways in both PMS/chlorine and chlorine processes. The kinetic study demonstrates that ACT oxidation by PMS/chlorine follows second order reaction, and the degradation efficiency can be promoted at alkaline conditions with peak rate constants at pH 9.0−10.0. The presence of chloride can enhance the removal of ACT, while ammonium and humic acid significantly retard ACT degradation. Higher formation of selected disinfection by-products (DBPs) is observed in the PMS/chlorine process than in the sole chlorination. This study highlights the important role of PMS in organic pollutants degradation and DBPs formation during the chlorination process.
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