Department of Chemical and Environmental Technology (ESCET), Universidad Rey Juan Carlos, C/ Tulipán s/n, 28933, Móstoles, Madrid, Spain; Department of Chemical and Environmental Engineering, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, C/ José Gutiérrez Abascal 2, 28006 Madrid, Spain.
Catalan Institute for Water Research (ICRA), H2O Building, Scientific and Technological Park of the University of Girona, 17003 Girona, Spain.
Sci Total Environ. 2019 Feb 20;652:1051-1061. doi: 10.1016/j.scitotenv.2018.10.223. Epub 2018 Oct 17.
This research reports for the first time the full-scale application of different homogeneous Advanced Oxidation Processes (AOPs) (HO/UV-C, PMS/UV-C and PMS/Fe(II)/UV-C) for the removal of antibiotics (ABs) and antibiotic resistance genes (ARGs) from wastewater effluent at Estiviel wastewater treatment plant (WWTP) (Toledo, Spain). AOPs based on the photolytic decomposition of HO and peroxymonosulfate tested at low dosages (0.05-0.5 mM) and with very low UV-C contact time (4-18 s) demonstrated to be more efficient than UV-C radiation alone on the removal of the analyzed ABs. PMS (0.5 mM) combined with UV-C (7 s contact time) was the most efficient treatment in terms of AB removal: 7 out of 10 ABs detected in the wastewater were removed more efficiently than using the other oxidants. In terms of ARGs removal efficiency, UV-C alone seemed the most efficient treatment, although HO/UV-C, PMS/UV-C and PMS/Fe(II)/UV-C were supposed to generate higher concentrations of free radicals. The results show that treatments with the highest removal of ABs and ARGs did not coincide, which could be attributed to the competition between DNA and oxidants in the absorption of UV photons, reducing the direct photolysis of the DNA. Whereas the photolytic ABs removal is improved by the generation of hydroxyl and sulfate radicals, the opposite behavior occurs in the case of ARGs. These results suggest that a compromise between ABs and ARGs removal must be achieved in order to optimize wastewater treatment processes.
本研究首次全面应用不同均相高级氧化工艺(AOPs)(HO/UV-C、PMS/UV-C 和 PMS/Fe(II)/UV-C),从埃斯蒂维尔污水处理厂(西班牙托莱多)的废水出水 中去除抗生素(ABs)和抗生素抗性基因(ARGs)。在低剂量(0.05-0.5 mM)和非常短的 UV-C 接触时间(4-18 s)下测试的基于 HO 光解和过氧单硫酸盐的 AOPs 被证明比单独的 UV-C 辐射更有效地去除分析的 ABs。PMS(0.5 mM)与 UV-C(7 s 接触时间)结合是去除 AB 方面最有效的处理方法:废水中检测到的 10 种 AB 中有 7 种比使用其他氧化剂更有效地去除。就 ARGs 去除效率而言,单独的 UV-C 似乎是最有效的处理方法,尽管 HO/UV-C、PMS/UV-C 和 PMS/Fe(II)/UV-C 被认为会产生更高浓度的自由基。结果表明,ABs 和 ARGs 去除效率最高的处理方法并不一致,这可能归因于 DNA 和氧化剂在吸收紫外光光子时的竞争,从而减少了 DNA 的直接光解。虽然羟基和硫酸根自由基的生成可提高 ABs 的光解去除,但在 ARGs 的情况下则会出现相反的行为。这些结果表明,为了优化废水处理过程,必须在 ABs 和 ARGs 的去除之间取得折衷。