Differences in the degradation behavior of disinfection by-products in UV/PDS and UV/H2O2 processes and the effect of their chemical properties

Ma, Yuhui; Li, Mingxue; Huo, Yanru; Zhou, Yuxin; Jiang, Jinchan; Xie, Ju; He, Maoxia

doi:10.1016/j.chemosphere.2023.140457

Cited by 8 publications

(1 citation statement)

References 56 publications

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“…Understanding the limitations of existing disinfection methods can realize an improvement in inactivating bacteria. Conventional drinking water treatment commonly employs a single disinfection method, such as ultraviolet (UV 254 ) [21], chlorination [22], persulfate (PDS) [23], and peracetic acid (PAA) [24]. Chlorine-based disinfectants exert oxidative stress on bacterial cells by disrupting their cell walls and membranes.…”

Section: Introductionmentioning

confidence: 99%

A Combination of UV and Disinfectant for Inactivating Viable but Nonculturable State Pseudomonas aeruginosa: Efficiency and Mechanisms

Zhao,

Zhu,

Tao

et al. 2024

Water

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Conventional disinfection techniques, relying on a single disinfection step, often fail to directly eliminate microorganisms, instead causing them to enter a viable but nonculturable (VBNC) state. However, microorganisms in the VBNC state retain metabolic activity and can reactivate under suitable conditions, representing a “hidden source of contamination” that threatens drinking water safety. This study fundamentally assessed the feasibility of combined disinfection methods by integrating UV254 with disinfectant (NaClO, PAA, and PDS) for inactivating Pseudomonas aeruginosa (P. aeruginosa), an opportunistic pathogen that has been widely detected in water supply systems. The number of culturable cells was determined using the heterotrophic plate counting (HPC) method, and the number of VBNC cells was quantified using our recently developed qPCR approach. Quantitative analyses showed that combined disinfection methods can effectively reduce both culturable and VBNC cells by several orders of magnitude compared to a single disinfection step. Notably, VBNC P. aeruginosa, after 30 min of UV/NaCIO treatment, was below the detection limit (3.191 log CFU/mL) of PMA-qPCR. The reactivation experiment also confirmed that VBNC P. aeruginosa did not reactivate for 16 h after 30 min of UV/NaClO treatment under controlled laboratory conditions. The higher disinfection capacity of combined methods can be attributed to the generation of reactive radicals. This study highlighted combined disinfection as a promising approach for the inactivation of bacteria in the VBNC state, yet further studies are needed before an application can be considered for minimizing VBNC reactivation in city utility water processing or high-risk building water distribution systems.

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