College of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou 350007, China.
College of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian, China.
J Hazard Mater. 2022 Aug 5;435:129099. doi: 10.1016/j.jhazmat.2022.129099. Epub 2022 May 7.
In this study, the UVA (Ultraviolet A) drinking water disinfection was promoted by electrolysis. The influences of the UVA, electrolysis current, bubbling and temperature were investigated. The disinfection mechanisms and bacterial reactivation had been studied. The results revealed that the treatment time needed to reach the DL (detection limit, about 5.4 log removal) was shortened from 180 to 80 min by the electrolysis. The total electricity consumption decreased from about 126-57.0 kJ/L. Compared with increasing the UVA irradiation, increasing the electrolysis current in a certain range was more preferred to improve the disinfection rate. Oxygen bubbling or higher temperature could enhance the E. coli inactivation. The quenching experiment and EPR (Electron paramagnetic resonance) detection confirmed that ROSs (O, ·O and ·OH) played important roles for the disinfection. Compared with the treatment with UVA alone, the cell membrane damage was more severe by the promoting method. In addition to the dramatically reduced enzyme activity, the synergistic process degraded most of the bacterial genomic DNA, and the bacteria were completely killed. Therefore, hybrid with electrolysis is a better way for the application of the UVA-LED disinfection.
在这项研究中，通过电解促进了 UVA（紫外线 A）饮用水消毒。考察了 UVA、电解电流、曝气和温度的影响。研究了消毒机制和细菌复活。结果表明，通过电解将达到 DL（检测限，约 5.4 对数去除）所需的处理时间从 180 分钟缩短到 80 分钟。总耗电量从约 126-57.0 kJ/L 降低。与增加 UVA 照射相比，在一定范围内增加电解电流更有利于提高消毒率。曝气或较高的温度可以增强大肠杆菌的失活。猝灭实验和 EPR（电子顺磁共振）检测证实，ROSs（O、·O 和·OH）在消毒中起重要作用。与单独使用 UVA 相比，促进方法会导致细胞膜损伤更严重。除了酶活性显著降低外，协同过程还降解了大部分细菌基因组 DNA，细菌被完全杀死。因此，电解的混合是 UVA-LED 消毒的更好应用方式。
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