Formation of disinfection by-products in a UV-activated mixed chlorine/chloramine system
Formation of disinfection by-products in a UV-activated mixed chlorine/chloramine system
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紫外线激活的混合氯/氯胺系统中消毒副产物的形成
DOI：
10.1016/j.jhazmat.2020.124373
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发表时间：
2021
影响因子：
13.6
通讯作者：
Gamal El-Din Mohamed
中科院分区：
文献类型：
--
作者：
Liu Zhi;Xu Bin;Zhang Tianyang;Hu Chenyan;Tang Yulin;Dong Zhengyu;Cao Tongcheng;Gamal El-Din Mohamed
近年来，紫外线（UV）照射与氯（氨）化工艺相结合在中国许多城市的二次供水系统中普遍存在。然而，紫外线激活混合氯/氯胺系统 (MCCS) 中消毒副产物 (DBP) 的形成仍不清楚。在这项研究中，系统地研究了紫外线激活MCCS中DBP的形成，考虑了影响因素，包括游离氯与NH2Cl的质量比、紫外线照射、pH值、NOM类型、Br-浓度和DBP的毒性。结果表明，当游离氯与NH2Cl的质量比从5:0变为0:5时，DBPs的形成显着减少。含腐殖酸（HA）的水中的DBPs形成量最高，其次是黄腐酸（FA）和藻类有机物（AOM）中的DBPs。此外，无论紫外线照射如何，在酸性条件下都可以更好地控制与 DBP 相关的计算毒性。此外，在存在 Br− 的情况下，在 UV 激活的 MCCS 中可以显着减少 DBP 的形成。研究结果还表明，在 MCCS 的高紫外线通量下，可以有效减少实际水中 DBP 的形成。
In recent years, ultraviolet (UV) irradiation coupled with chlor(am)ination process is ubiquitous in secondary water supply systems in many cities of China. However, the disinfection by-products (DBPs) formation in a UV-activated mixed chlorine/chloramine system (MCCS) still remains unclear. In this study, the DBPs formation in a UV-activated MCCS was systematically investigated, considering influencing factors including the mass ratios of free chlorine to NH2Cl, UV irradiation, pH values, NOM types, Br−concentration and toxicity of the DBPs. Results indicated that DBPs formation decreased remarkably as mass ratio of free chlorine to NH2Cl changed from 5:0 to 0:5. The DBPs formation in humic acid (HA)-containing water was the highest, followed by those in fulvic acid (FA) and algal organic matter (AOM). Besides, better control of the DBP-related calculated toxicity can be achieved in acidic conditions regardless of the UV irradiation. Furthermore, in the presence of Br−, a significant reduction of DBPs formation could be achieved in a UV-activated MCCS. The findings also demonstrated that DBPs formation in real water can be effectively reduced at high UV fluence in a MCCS.