Türk Oruç Kaan, Adalar Gizem, Yazici Guvenc Senem, Can-Güven Emine, Varank Gamze, Demir Ahmet
Faculty of Civil Engineering, Department of Environmental Engineering, Yildiz Technical University, Esenler, Instanbul, 34220, Turkey.
Environ Sci Pollut Res Int. 2023 Jan;30(1):869-883. doi: 10.1007/s11356-022-22229-z. Epub 2022 Jul 29.
In this study, the performance of ultraviolet (UV)-assisted persulfate (PS) and percarbonate (PC) oxidation processes in oxytetracycline (OTC) removal was investigated. UVC lamps were used for the photolysis process and the effect of operating parameters (initial pH, oxidant dose, initial OTC concentration, UV intensity) on OTC removal efficiency was determined. Control experiments were carried out at pH 5.5 and 32 W UV power for 60 min by adding a 4 mM oxidant with 10 mg/L initial OTC concentration. The OTC removal efficiency obtained as a result of only photolysis was 17.3% and the removal efficiency obtained by PS and PC oxidation alone was 18.3% and 12.7%, respectively. The OTC removal efficiencies increased in the combined processes and reached 58.1% and 69.9% for the UV-PS and UV-PC processes, respectively. The reaction rates of the processes were ranked as UV-PC > UV-PS > PS > UV > PC. In the UV-PS and UV-PC processes, the highest removal efficiencies were achieved at alkaline pH values. The OTC removal efficiency was increased with the increase in oxidant dose; however, the efficiency decreased after a certain dose due to the scavenging effect. The removal efficiency also increased as the initial OTC concentration decreased. The UV intensity had a positive effect on OTC removal efficiency. The effect of the water matrix on OTC removal efficiency was investigated while the dominant radical types were determined in UV-assisted processes. The EE/O values for the UV-PS and UV-PC processes were calculated as 211 kWh/m and 153 kWh/m, respectively for 60 min of reaction time. Although similar removal efficiencies were obtained with both UV-assisted processes, the UV-PC process steps forward in terms of being a novel, environmentally friendly, more economic, and promising technology for OTC removal.
在本研究中，考察了紫外线（UV）辅助过硫酸盐（PS）和过碳酸盐（PC）氧化工艺对土霉素（OTC）的去除效果。使用紫外灯进行光解过程，并确定了操作参数（初始pH值、氧化剂剂量、初始OTC浓度、紫外线强度）对OTC去除效率的影响。通过添加4 mM氧化剂、初始OTC浓度为10 mg/L，在pH 5.5和32 W紫外光功率下进行60分钟的对照实验。仅光解得到的OTC去除效率为17.3%，单独PS和PC氧化得到的去除效率分别为18.3%和12.7%。在联合工艺中，OTC去除效率提高，UV-PS和UV-PC工艺分别达到58.1%和69.9%。各工艺的反应速率排序为UV-PC＞UV-PS＞PS＞UV＞PC。在UV-PS和UV-PC工艺中，在碱性pH值下实现了最高去除效率。OTC去除效率随氧化剂剂量的增加而提高；然而，由于清除效应，在一定剂量后效率下降。去除效率也随着初始OTC浓度的降低而提高。紫外线强度对OTC去除效率有积极影响。研究了水基质对OTC去除效率的影响，同时确定了紫外线辅助工艺中的主要自由基类型。对于60分钟的反应时间，UV-PS和UV-PC工艺的EE/O值分别计算为211 kWh/m和153 kWh/m。虽然两种紫外线辅助工艺获得了相似的去除效率，但UV-PC工艺在作为一种用于OTC去除的新型、环保、更经济且有前景的技术方面更具优势。
