XUYuan-sheng,WANGJun-shu,PANRan,et al.Effective Inactivation of P. aeruginosa and ARGs Removal in UV/PAA Process: Performance and Mechanisms[J].China Water & Wastewater,2025,41(1):32-39.
Effective Inactivation of P. aeruginosa and ARGs Removal in UV/PAA Process: Performance and Mechanisms
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第1期
Page:
32-39
Column:
Date of publication:
2025-01-01
- Keywords:
- ultraviolet; peracetic acid; inactivation; P. aeruginosa; viable but non? culturable (VBNC); antibiotic resistance genes
- Abstract:
- Peracetic acid (PAA) can effectively inactivate bacteria and control disinfection byproducts (DBPs). However, it may promote bacterial reactivation after treatment. This study investigated the performance and mechanism of the UV/PAA process for P. aeruginosa inactivation to enhance disinfection. Experimental and characterization methods such as inactivation, dark repair, membrane permeability analysis and electron microscopy scanning showed that the inactivation performance of the UV/PAA process was superior to that of UV or PAA alone due to the generation of free radicals and intracellular reactive oxygen species (ROS) in the UV/PAA system. The membrane permeability of P. aeruginosa increased over time when exposed to the UV/PAA system. Additionally, severe disruption of the cell surface structure was observed, resulting in the leakage of intracellular material such as DNA and proteins. The UV/PAA treatment was highly effective in inhibiting the bacterial dark repair phenomenon and further inactivating the viable but non?culturable (VBNC) cells, demonstrating a far superior oxidation ability of UV or PAA alone. Additionally, the UV/PAA process could efficiently eliminate antibiotic resistance genes (ARGs).
Last Update:
2025-01-01