Garkusheva Natalya, Matafonova Galina, Tsenter Irina, Beck Sara, Batoev Valeriy, Linden Karl
a Laboratory of Engineering Ecology , Baikal Institute of Nature Management, Siberian Branch of Russian Academy of Sciences , Ulan-Ude , Russia.
b Department of Civil, Environmental and Architectural Engineering , University of Colorado at Boulder , Boulder , Colorado , USA.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2017 Jul 29;52(9):849-855. doi: 10.1080/10934529.2017.1312188. Epub 2017 Apr 27.
This work evaluated the feasibility of a photo-Fenton-like process using persulfate (PS) and ferrous iron (Fe) under simulated solar radiation for degrading the herbicide atrazine (ATZ, 6-Chloro-N-ethyl-N'-isopropyl-1,3,5-triazine-2,4-diamine) and inactivating E. coli. Milli Q water, lake water, and diluted wastewater effluents were spiked both simultaneously and separately with ATZ (4 mg/L) and E. coli (10 CFU/mL), and exposed to treatment. A method for determining the average irradiance throughout the water media in the UV(A+B) range of the Xe lamp emission was developed for bench-scale experiments. These values were used to calculate the UV(A+B) fluences and the solar UV(A+B) energy doses per unit of volume (Q, kJ/L). The obtained kinetic data were presented versus energy dose. Treatment of lake water at near-neutral pH was ineffective via the photo-Fenton-like process, attaining only 20% ATZ removal and 1-log reduction of E. coli. In Milli Q water and wastewater, the complete degradation of ATZ in the absence of bacteria was observed at an average energy dose of 1.5 kJ/L (60 min), while in the presence of cells the degradation efficiency was ∼60%. When ATZ was present, E. coli inactivation was also affected in Milli Q water, with 1.4-log reduction (93%) at a dose of 1.6 kJ/L (60 min), whereas in wastewater complete inactivation was achieved at a lower dose of 1.3 kJ/L (45 min). The energy requirements on a Q basis for simultaneous 90% ATZ removal and 99.99% E. coli inactivation in Milli Q water and wastewater were shown to be less than 10 kJ/L. This suggests the solar/PS/Fe system is promising for simultaneous treatment and disinfection of wastewater effluents.
本研究评估了在模拟太阳辐射下，使用过硫酸盐（PS）和亚铁离子（Fe）的类光芬顿过程降解除草剂阿特拉津（ATZ，6-氯-N-乙基-N'-异丙基-1,3,5-三嗪-2,4-二胺）以及灭活大肠杆菌的可行性。将超纯水、湖水和稀释后的废水流出物同时和分别加入ATZ（4mg/L）和大肠杆菌（10CFU/mL），然后进行处理。针对实验室规模的实验，开发了一种用于测定氙灯发射的UV(A+B)范围内整个水介质平均辐照度的方法。这些值用于计算UV(A+B)通量和每单位体积的太阳UV(A+B)能量剂量（Q，kJ/L）。所获得的动力学数据以能量剂量为横坐标进行呈现。在接近中性pH值的条件下，通过类光芬顿过程处理湖水效果不佳，仅实现了20%的ATZ去除率和1个对数级的大肠杆菌灭活。在超纯水和废水中，在无细菌的情况下，平均能量剂量为1.5kJ/L（60分钟）时可观察到ATZ的完全降解，而在有细胞存在时，降解效率约为60%。当存在ATZ时，超纯水中的大肠杆菌灭活也受到影响，在剂量为1.6kJ/L（60分钟）时减少了1.4个对数级（93%），而在废水中，较低剂量1.3kJ/L（45分钟）即可实现完全灭活。结果表明，在超纯水和废水中，同时实现90%的ATZ去除率和99.99%的大肠杆菌灭活所需的基于Q的能量需求小于10kJ/L。这表明太阳能/PS/Fe系统在同时处理和消毒废水流出物方面具有潜力。
