Moreno-Andrés Javier, Tierno-Galán Miguel, Romero-Martínez Leonardo, Acevedo-Merino Asunción, Nebot Enrique
Department of Environmental Technologies, Faculty of Marine and Environmental Sciences. INMAR-Marine Research Institute, CEIMAR- International Campus of Excellence of the Sea. University of Cadiz, Spain.
Department of Environmental Technologies, Faculty of Marine and Environmental Sciences. INMAR-Marine Research Institute, CEIMAR- International Campus of Excellence of the Sea. University of Cadiz, Spain.
Water Res. 2023 Apr 1;232:119686. doi: 10.1016/j.watres.2023.119686. Epub 2023 Jan 31.
Ultraviolet (UV) radiation is a well-implemented process for water disinfection. The development of emergent UV sources, such as light-emitting diodes (LEDs), has afforded new possibilities for advanced oxidation processes. The emission wavelength is considered to be an important factor for photo-chemical processes in terms of both biological damage and energetic efficiency, as the inactivation mechanisms and mode-of-action may differ according to the wavelength that is applied. In addition, these processes merit exploration for inactivating emerging pathogens, such as marine vibrios, that are important bacteria to control in maritime activities. The main goal of this study was to compare the disinfection efficacy of several UV-LED driven processes with different modes of action. First, the effect of UV-LEDs was assessed at different UV ranges (UV-A, UV-B, or UV-C). Second, the possible enhancement of a combination with hydrogen peroxide (HO) or peroxymonosulfate salt (HSO) was investigated under two different application strategies, i.e. simultaneous or sequential. The results obtained indicate a high sensitivity of Vibrio alginolyticus to UV radiation, especially under UV-B (k = 0.24 cm/mJ) and UV-C (k = 1.47 cm/mJ) irradiation. The highest inactivation rate constants were obtained for UV/HSO (k (cm/mJ)=0.0007 (UV-A); 0.39 (UV-B); 1.79 (UV-C)) with respect to UV/HO (k (cm/mJ)=0.0006 (UV-A); 0.26 (UV-B); and 1.54 (UV-C)) processes, however, regrowth was avoided only with UV/HO. Additionally, the disinfection enhancement caused by a chemical addition was more evident in the order UV-A > UV-B > UV-C. By applying HO (10 mg/L) or HSO (2.5 mg/L) in a sequential mode before the UV, negligible effects were obtained in comparison with the simultaneous application. Finally, promising electrical energy per order (EE) values were obtained as follows: UV/HSO (EE (kWh/m)=1.68 (UV-A); 0.20 (UV-B); 0.04 (UV-C)) and UV/HO (EE (kWh/m)=2.15 (UV-A); 0.32 (UV-B); 0.04 (UV-C)), demonstrating the potential of UV-LEDs for disinfection in particular activities such as the aquaculture industry or maritime transport.
紫外线（UV）辐射是一种广泛应用于水消毒的工艺。诸如发光二极管（LED）等新型紫外线光源的发展为高级氧化工艺带来了新的可能性。就生物损伤和能量效率而言，发射波长被认为是光化学过程的一个重要因素，因为灭活机制和作用方式可能会因所应用的波长而有所不同。此外，对于灭活诸如海洋弧菌等新兴病原体而言，这些工艺值得探索，海洋弧菌是海上活动中需要控制的重要细菌。本研究的主要目标是比较几种具有不同作用方式的紫外线发光二极管驱动工艺的消毒效果。首先，在不同的紫外线范围（UV-A、UV-B或UV-C）下评估紫外线发光二极管的效果。其次，研究了在两种不同的应用策略下，即同时或顺序添加过氧化氢（HO）或过一硫酸盐（HSO）时可能产生的增强效果。所获得的结果表明，溶藻弧菌对紫外线辐射高度敏感，尤其是在UV-B（k = 0.24 cm/mJ）和UV-C（k = 1.47 cm/mJ）照射下。相对于UV/HO工艺（k (cm/mJ)=0.0006 (UV-A); 0.26 (UV-B); 1.54 (UV-C)），UV/HSO工艺（k (cm/mJ)=0.0007 (UV-A); 0.39 (UV-B); 1.79 (UV-C)）获得了最高的灭活速率常数，然而，只有UV/HO工艺避免了再生长。此外，化学添加所导致的消毒增强效果在UV-A > UV-B > UV-C的顺序中更为明显。与同时添加相比，在紫外线照射前以顺序模式添加HO（10 mg/L）或HSO（2.5 mg/L）时，获得的效果可忽略不计。最后，获得了如下有前景的每消耗一单位电能（EE）的值：UV/HSO（EE (kWh/m)=1.68 (UV-A); 0.20 (UV-B); 0.04 (UV-C)）和UV/HO（EE (kWh/m)=2.15 (UV-A); 0.32 (UV-B); 0.04 (UV-C)），这表明紫外线发光二极管在水产养殖业或海上运输等特定活动中的消毒潜力。
