Lara de Larrea Jaser, MacIsaac Sean A, Rauch Kyle D, Stoddart Amina K, Gagnon Graham A
Centre for Water Resources Studies. Department of Civil & Resource Engineering, Dalhousie University, Halifax B3H 4R2, NS, Canada.
ACS ES T Water. 2023 Nov 1;3(11):3667-3675. doi: 10.1021/acsestwater.3c00428. eCollection 2023 Nov 10.
This study assesses the efficacy of ultraviolet light-emitting diodes (UV LEDs) for deactivating (pure culture) and (pure culture and biofilms) on relevant drinking water distribution system surfaces (cast iron and stainless steel). UV LED treatment at 280 nm demonstrated superior performance compared to that at 365 nm, achieving a 4.8 log reduction value (LRV) for pure cultures and, for biofilms, 4.02 LRV for stainless steel and 2.96 LRV for cast iron at 280 nm. Conversely, the results were less effective at 365 nm, with suspected photolytic reactions on cast iron. Quantification of yielded varying results: 4 LRV using standard plate counts, 1.8 LRV with Legiolert, and 1 LRV with quantitative polymerase chain reaction at 280 nm, while the results were less than 1.5 LRV at 365 nm. This study provides insights into managing opportunistic pathogens and biofilms, emphasizing the need for improved quantification tools to better assess treatment efficacy.
本研究评估了紫外线发光二极管（UV LED）对相关饮用水分配系统表面（铸铁和不锈钢）上的（纯培养物）和（纯培养物及生物膜）进行灭活的效果。与365 nm处的UV LED处理相比，280 nm处的UV LED处理表现出更优异的性能，对于纯培养物实现了4.8个对数减少值（LRV），对于生物膜，在280 nm处，不锈钢表面实现了4.02 LRV，铸铁表面实现了2.96 LRV。相反，365 nm处的结果效果较差，铸铁表面存在疑似光解反应。对的定量产生了不同的结果：在280 nm处，使用标准平板计数法为4 LRV，使用Legiolert为1.8 LRV，使用定量聚合酶链反应为1 LRV，而在365 nm处结果小于1.5 LRV。本研究为管理机会性病原体和生物膜提供了见解，强调需要改进定量工具以更好地评估处理效果。
