Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy.
Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy.
Water Res. 2019 Feb 1;149:272-281. doi: 10.1016/j.watres.2018.11.031. Epub 2018 Nov 14.
Photo-driven advanced oxidation process (AOP) with peracetic acid (PAA) has been poorly investigated in water and wastewater treatment so far. In the present work its possible use as tertiary treatment of urban wastewater to effectively minimize the release into the environment of contaminants of emerging concern (CECs) and antibiotic-resistant bacteria was investigated. Different initial PAA concentrations, two light sources (sunlight and UV-C) and two different water matrices (groundwater (GW) and wastewater (WW)) were studied. Low PAA doses were found to be effective in the inactivation of antibiotic resistant Escherichia coli (AR E. coli) in GW, with the UV-C process being faster (limit of detection (LOD) achieved for a cumulative energy (Q) of 0.3 kJL with 0.2 mg PAA L) than solar driven one (LOD achieved at Q = 4.4 kJL with 0.2 mg PAA L). Really fast inactivation rates of indigenous AR E. coli were also observed in WW. Higher Q and PAA initial doses were necessary to effectively remove the three target CECs (carbamazepine (CBZ), diclofenac and sulfamethoxazole), with CBZ being the more refractory one. In conclusion, photo-driven AOP with PAA can be effectively used as tertiary treatment of urban wastewater but initial PAA dose should be optimized to find the best compromise between target bacteria inactivation and CECs removal as well as to prevent scavenging effect of PAA on hydroxyl radicals because of high PAA concentration.
目前为止，光驱动过氧乙酸（PAA）高级氧化工艺（AOP）在水和废水处理中的应用研究还很少。本工作研究了其作为城市废水的三级处理方法，以有效减少环境中新兴关注污染物（CECs）和抗生素耐药细菌的释放。研究了不同初始 PAA 浓度、两种光源（阳光和 UV-C）和两种不同的水基质（地下水（GW）和废水（WW））。研究发现，低剂量的 PAA 可有效灭活 GW 中的抗生素耐药大肠杆菌（AR E. coli），其中 UV-C 工艺比太阳光驱动的工艺更快（在累积能量（Q）为 0.3 kJL，PAA 浓度为 0.2 mg L 时达到检测限（LOD））。在 WW 中也观察到土著 AR E. coli 的快速失活。为了有效去除三种目标 CECs（卡马西平（CBZ）、双氯芬酸和磺胺甲恶唑），需要更高的 Q 和初始 PAA 剂量，其中 CBZ 最难去除。总之，光驱动 PAA AOP 可有效作为城市废水的三级处理方法，但初始 PAA 剂量应进行优化，以在目标细菌灭活和 CECs 去除之间找到最佳平衡，并防止由于高 PAA 浓度而导致 PAA 对羟基自由基的清除作用。
