PPCP Degradation by Chlorine-UV Processes in Ammoniacal Water: New Reaction Insights, Kinetic Modeling, and DBP Formation.
PPCP Degradation by Chlorine-UV Processes in Ammoniacal Water: New Reaction Insights, Kinetic Modeling, and DBP Formation.
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DOI：
10.1021/acs.est.8b00094
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发表时间：
2018-06
影响因子：
11.4
通讯作者：
Ruochun Zhang;Tan Meng;Ching-Hua Huang;Weiwei Ben;H. Yao;Ruini Liu;Peizhe Sun
中科院分区：
文献类型：
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作者：
Ruochun Zhang;Tan Meng;Ching-Hua Huang;Weiwei Ben;H. Yao;Ruini Liu;Peizhe Sun
氯与紫外光的结合(即氯-紫外光处理工艺)近年来引起了更多的关注，因为它可以很容易地并入现有的水处理设施中，以去除PPCP。然而，关于总氨氮(TAN)的影响的信息有限。本研究以氯气-紫外光反应的两个阶段(氯化和UV/氯(Am)ine)为研究对象，研究了两种模式的PPCPs，N，N-二乙基-3-甲基甲酰胺(DEET)和咖啡因(CAF)对TAN的影响。在氯化过程中，DEET和CAF的降解与TAN消耗的总氯量呈正相关。活性氮中间体HNO/NO-和ONOOH/ONOO-以及·OH是DEET和CAF去除的主要贡献者。在紫外光照射下，DEET和CaF在UV/氯或UV/NH_2Cl条件下被降解。在UV/NH_2Cl条件下，·OH和·Cl是降解DEET和CAF的主要反应物种，而在UV/氯条件下，·OCL对CAF的降解起主要作用。建立了氯化-UV工艺去除DEET和CAF的数值模型。检测出氯化消毒副产物。总体而言，本研究提供了氨水中氯-紫外光降解PPCPs的动力学特征和机理见解。
The combination of chlorine and UV (i.e., chlorine-UV process) has been attracting more attention in recent years due to its ready incorporation into existing water treatment facilities to remove PPCPs. However, limited information is available on the impact of total ammonia nitrogen (TAN). This study investigated two model PPCPs, N,N-diethyl-3-toluamide (DEET) and caffeine (CAF), in the two stages of the chlorine-UV process (i.e., chlorination and UV/chlor(am)ine) to elucidate the impact of TAN. During chlorination, the degradation of DEET and CAF was positively correlated with the overall consumption of total chlorine by TAN. Reactive nitrogen intermediates, including HNO/NO- and ONOOH/ONOO-, along with •OH were identified as major contributors to the removal of DEET and CAF. During UV irradiation, DEET and CAF were degraded under UV/chlorine or UV/NH2Cl conditions. •OH and •Cl were the major reactive species to degrade DEET and CAF under UV/NH2Cl conditions, whereas •OCl played a major role for degrading CAF under UV/chlorine conditions. Numerical models were developed to predict the removal of DEET and CAF under chlorination-UV process. Chlorinated disinfection byproducts were detected. Overall, this study presented kinetic features and mechanistic insights on the degradation of PPCPs under the chlorine-UV process in ammoniacal water.