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首页> 外文期刊>Environmental Science & Technology >PPCP Degradation by Chlorine-UV Processes in Ammoniacal Water: New Reaction Insights, Kinetic Modeling, and DBP Formation
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PPCP Degradation by Chlorine-UV Processes in Ammoniacal Water: New Reaction Insights, Kinetic Modeling, and DBP Formation

机译：氨水中氯-紫外线法降解PPCP：新的反应见解，动力学建模和DBP形成

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摘要

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)-O-center dot 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)-O-center dot and Cl-center dot were the major reactive species to degrade DEET and CAF under UV/NH2Cl conditions, whereas (OCl)-O-center dot 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.
机译：氯和紫外线的结合（即氯-紫外线工艺）近年来受到了越来越多的关注，因为它已经被并入现有的水处理设施中以去除PPCP。但是，关于总氨氮（TAN）影响的信息有限。这项研究调查了两个模型PPCP，N，N-二乙基-3-甲苯甲酰胺（DEET）和咖啡因（CAF），是在氯-UV过程的两个阶段（即氯化和UV /氯（胺））阐明的。 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，包括HNO / NO-和ONOOH / ONOO-，以及（OH）-O-中心点，被确定为去除DEET和CAF的主要因素。在紫外线照射期间，DEET和CAF在紫外线/氯气或紫外线/ NH2Cl条件下会降解。 （OH）-O-中心点和Cl-中心点是在UV / NH2Cl条件下降解DEET和CAF的主要反应物种，而（OCl）-O-中心点在UV /氯条件下对CAF降解起主要作用。建立了数值模型，以预测氯化-紫外线工艺下DEET和CAF的去除。检测到氯化消毒副产物。总的来说，这项研究提供了在氨水中氯-紫外线过程下PPCPs降解的动力学特征和机理的见解。

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  • 来源
    《Environmental Science & Technology》 |2018年第14期|7833-7841|共9页
  • 作者

    Zhang Ruochun; Meng Tan; Huang Ching-Hua; Ben Weiwei; Yao Hong; Liu Ruini; Sun Peizhe;

  • 作者单位

    Tianjin Univ, Institute Surf Earth Syst Sci, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China;

    Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China;

    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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