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N-Nitrosodimethylamine (NDMA) Degradation by the Ultraviolet/Peroxodisulfate Process
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-01-11 , DOI: 10.1021/acs.estlett.8b00667 Inmaculada Velo-Gala 1 , María J. Farré 1 , Jelena Radjenovic 1, 2 , Wolfgang Gernjak 1, 2
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-01-11 , DOI: 10.1021/acs.estlett.8b00667 Inmaculada Velo-Gala 1 , María J. Farré 1 , Jelena Radjenovic 1, 2 , Wolfgang Gernjak 1, 2
Affiliation
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This study investigates the photodegradation kinetics of N-nitrosodimethylamine (NDMA) by the ultraviolet (UV)/S2O82– process initiated by a medium-pressure mercury lamp in a collimated beam setup. Experiments were carried out to characterize the kinetics in the absence and presence of bicarbonate, chloride, and sulfate. The kinetic behavior adjusted well to first-order dependence, and the addition of 33.6 μM S2O82– increased the NDMA removal rate by 3–4 times compared to direct photolysis leading to a reduction of 1 order of magnitude for every 8.2 × 103 J m–2 of fluence. In the range investigated, the reaction rate increased linearly with peroxodisulfate concentration. The presence of inorganic carbon and chloride can negatively affect the efficiency of both the UV/S2O82– process and the conventional UV/H2O2 process, yet given that the reaction rate constants of Cl– and HCO3– with the •OH radical are 1 and 3 orders of magnitude higher, respectively, than with SO4•–, their scavenging effect is less pronounced in the UV/S2O82– process. In conclusion, the UV/S2O82– process efficiently removes NDMA from water even containing a low concentration of HCO3– and Cl– anions such as reverse osmosis permeates.
中文翻译：
紫外线/过二硫酸盐法降解N-亚硝基二甲胺（NDMA）
这项研究研究了中压汞灯在准直光束装置中引发的紫外线（UV）/ S 2 O 8 2–引发的N-亚硝基二甲胺（NDMA）的光降解动力学。进行实验以表征在不存在和存在碳酸氢盐，氯化物和硫酸盐的情况下的动力学。动力学行为很好地适应了一级依赖性，并且与直接光解相比，添加33.6μMS 2 O 8 2–将NDMA去除率提高了3-4倍，从而使每8.2×减少了一个数量级。 10 3 J m –2的影响力。在所研究的范围内，反应速率随过二硫酸盐浓度线性增加。无机碳和氯化物的存在会对UV / S 2 O 8 2 –工艺和常规UV / H 2 O 2工艺的效率均产生负面影响，但考虑到Cl –和HCO 3 –的反应速率常数与的• OH自由基的大小的1个3数量级，分别比与SO 4 • - ，其清除作用较少在UV发音/ S 2个ö 8 2-过程。总之，UV / S 2O 8 2 –工艺可以有效地从水中去除NDMA，即使其中含有低浓度的HCO 3 –和Cl –阴离子，例如反渗透渗透物。
更新日期：2019-02-07
中文翻译：
紫外线/过二硫酸盐法降解N-亚硝基二甲胺（NDMA）
这项研究研究了中压汞灯在准直光束装置中引发的紫外线（UV）/ S 2 O 8 2–引发的N-亚硝基二甲胺（NDMA）的光降解动力学。进行实验以表征在不存在和存在碳酸氢盐，氯化物和硫酸盐的情况下的动力学。动力学行为很好地适应了一级依赖性，并且与直接光解相比，添加33.6μMS 2 O 8 2–将NDMA去除率提高了3-4倍，从而使每8.2×减少了一个数量级。 10 3 J m –2的影响力。在所研究的范围内，反应速率随过二硫酸盐浓度线性增加。无机碳和氯化物的存在会对UV / S 2 O 8 2 –工艺和常规UV / H 2 O 2工艺的效率均产生负面影响，但考虑到Cl –和HCO 3 –的反应速率常数与的• OH自由基的大小的1个3数量级，分别比与SO 4 • - ，其清除作用较少在UV发音/ S 2个ö 8 2-过程。总之，UV / S 2O 8 2 –工艺可以有效地从水中去除NDMA，即使其中含有低浓度的HCO 3 –和Cl –阴离子，例如反渗透渗透物。
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