Activation of peroxymonosulfate using drinking water treatment residuals for the degradation of atrazine
Activation of peroxymonosulfate using drinking water treatment residuals for the degradation of atrazine
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使用饮用水处理残留物活化过一硫酸盐以降解莠去津
DOI：
10.1016/j.jhazmat.2017.11.038
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发表时间：
2018
影响因子：
13.6
通讯作者：
Fan Guoxuan
中科院分区：
文献类型：
--
作者：
Zhang Huijuan;Liu Xitao;Ma Jun;Lin Chunye;Qi Chengdu;Li Xiaowan;Zhou Zhou;Fan Guoxuan
饮用水处理残留物（WTRs）是含铁水处理厂的安全副产品。研究了wtr催化的过氧单硫酸盐（PMS）对水溶液中阿特拉津（ATZ）的降解作用。考察了影响催化性能的因素（PMS浓度、催化剂用量、初始溶液pH、反应温度和水基质种类）。结果表明，随着PMS浓度和温度的升高，ATZ的催化降解效率提高，而WTRs含量越高，由于高pH的猝灭效应和负效应，ATZ的去除率越低。初始溶液pH为3和5时，ATZ在6 h内的降解率分别为94.1%和87.4%，而pH为7时，ATZ的降解率仅为26%。通过经典自由基猝灭和电子自旋共振（ESR）实验证实了硫酸盐自由基（so4）和羟基自由基（dotOH）的产生。根据GC-MS和LC-MS结果，ATZ的主要降解途径可能包括脱烷基、脱氯-羟基化和烷基链氧化过程。除了ATZ的去除能力外，WTRs/PMS系统还可以同时去除磷。本文为污水处理和废水资源化利用提供了新的思路。
Drinking water treatment residuals (WTRs) are safe byproducts of water treatment plants containing iron. This work studies the degradation of atrazine (ATZ) by WTR-catalyzed peroxymonosulfate (PMS) in aqueous solutions. Factors that affect the catalytic performance (the PMS concentration, catalyst dose, initial solution pH, reaction temperature and water matrix species) were investigated. The results show that the catalytic degradation efficiency of ATZ increases with the increase in PMS concentration and temperature, whereas a higher content of WTRs results in lower removal efficiency because of the quenching effect and negative effect of high pH. For an initial solution pH of 3 and 5, 94.1% and 87.4% of ATZ degradation can be achieved within 6 h, whereas the value is only 26% for pH of 7. The production of sulfate radicals (SO4radical dot−) and hydroxyl radicals (radical dotOH) was confirmed by classic radical quenching and electron spin resonance (ESR) tests. Based on the GC–MS and LC–MS results, the main degradation pathways of ATZ may contain dealkylation, dechlorination-hydroxylation, and alkyl chain oxidation processes. In addition to the ATZ removal ability, the WTRs/PMS system can simultaneously remove phosphorus. This article provides a new idea for wastewater treatment and usage of WTRs as a resource.