A novel water disinfection method based on dual-wavelength UV radiation of KrCl (222 nm) and XeBr (282 nm) excilamps

Tsenter, Irina; Garkusheva, N. M.; Matafonova, Galina; Batoev, Valeriy

doi:10.1016/j.jece.2022.107537

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…The gram-negative bacteria has been shown to be more sensitive to UVC irradiation than gram-positive bacteria, which has a thicker peptidoglycan layer (Rohde, 2019). In the study, 4.6 mJ/cm 2 was required for E. faecalis to reach 5-log inactivation under irradiation of 222 nm KrCl excimer lamp while only 2.4 mJ/cm 2 was required for E. coli (Tsenter et al, 2022). Therefore, there are wide variations in UVC resistance of different bacteria (Huang et al, 2016).…”

Section: A B Figurementioning

confidence: 88%

Study on the inactivation and reactivation mechanism of pathogenic bacteria in aquaculture by UVC-LED

et al. 2023

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Ultraviolet disinfection is an important method for controlling the large-scale outbreaks of diseases in aquaculture. As a novel and promising light source, ultraviolet light-emitting diode (UV-LED) has the advantages of safety, high efficiency and no environmental pollution risks. However, it remains unclear whether UV-LEDs can replace traditional UV light sources for aquaculture water treatment processes. Present study aimed to investigate the efficacy of UVC-LEDs (265 nm) on pathogenic bacteria, specifically Aeromonas salmonicida and Escherichia coli. The effects of UVC-LED dose, light conditions, and temperature on bacterial reactivation were also investigated. The results showed that exposure to UVC-LED effectively inactivated both types of bacteria. To achieve 4.5-log inactivation of A. salmonicida and E. coli, 24 mJ/cm2 and 28 mJ/cm2 UVC-LED irradiation were required, and the inactivation rate increased with increasing UVC-LED fluence. Both A. salmonicida and E. coli were revived after UVC-LED disinfection, and photoreactivation was significantly higher than dark reactivation. Bacterial reactivation rate due to high-dose UVC-LED treatment was significantly lower than that of low-dose. After 72 h of reactivation, photoreactivation and dark reactivation rates were 1 ± 0.4% and 2.2 ± 0.2%for A. salmonicida, and 0.02% and 0% for E. coli, respectively. Besides, the photoreactivation rates for the two bacteria exhibited different correlations with temperature. The highest photoreactivation rate for A. salmonicida was 68.7 ± 4% at 20°C, while the highest photoreactivation rate for E. coli was 53.98 ± 2.9% at 15°C for 48 h. This study reveals the rapid and efficient inactivation of bacteria by UVC-LED, and elucidates the mechanism and influencing factors for inactivation and reactivation by UVC-LED. The study also highlights that adequate UVC-LED irradiation and avoidance of visible light after UVC-LED disinfection can effectively inhibit bacterial reactivation. Our findings form a reference for the design and operation of UV disinfection in aquaculture.

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Section: A B Figurementioning

confidence: 88%

Study on the inactivation and reactivation mechanism of pathogenic bacteria in aquaculture by UVC-LED

et al. 2023

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“…Previous research has also confirmed that both continuous UVC and pulsed UV light efficiently reduce bacterial levels on the egg surface. Furthermore, simultaneous dual-wavelength ultraviolet (DWUV) irradiation at 222 nm and 282 nm showed a decent effect in terms of a 5-log (complete) inactivation of E. coli and E. faecalis in synthetic water at pH 6.4–7.0 (Holck et al 2018 ; Tsenter et al 2022 ).…”

Section: Discussionmentioning

confidence: 99%

“…UV-irradiation is a novel technology that has gained widespread attention as a highly effective method for disinfecting surfaces from pathogenic microorganisms. It has been investigated as an alternative to conventional disinfection procedures in medical treatment, healthcare settings, and epidemic prevention (Lindsley et al 2018 ; Holck et al 2018 ; Tsenter et al 2022 ; Yang et al 2019 ). The UV spectrum can be broadly divided into four general classifications based on the wavelength's interaction with molecules: vacuum ultraviolet (VUV) with wavelengths below 200 nm, UVC with wavelengths between 200 and 280 nm, ultraviolet B (UVB) with wavelengths ranging from 280 to 315 nm, and ultraviolet A (UVA) with wavelengths ranging from 315 to 400 nm.…”

Section: Introductionmentioning

confidence: 99%

Study on disinfection effect of a 222-nm UVC excimer lamp on object surface

Ning,

Han,

Liu

et al. 2023

AMB Expr

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Effective disinfection of contaminated surfaces is essential for preventing the transmission of pathogens. In this study, we investigated the UV irradiance and wavelength distribution of a 222-nm ultraviolet C (UVC) excimer lamp and its disinfection efficacy against microorganisms in laboratory conditions. By using a carrier quantitative germicidal test with stainless steel sheets as carriers, we examined the disinfection effect of the 222-nm UVC lamp on three standard strains-Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. We tested the disinfection efficacy under different conditions by adjusting irradiation time, as well as the state and temperature of the stainless steel carriers. Our results indicated that a bacterial suspension in PBS and not-dried stainless steel carriers yielded better disinfection than in TSB and dried carriers. Additionally, carrier temperature had no significant impact on disinfection efficacy. When utilizing a bacterial suspension in PBS and non-dried carriers at a temperature of 20 °C, the three bacteria were eliminated by 222-nm UVC excimer lamp irradiation in just 15 s. In contrast, when using a bacterial suspension in TSB and dried carriers at temperatures of 20 °C, 4 °C, or − 20 °C, the three bacteria were eradicated by 222-nm UVC excimer lamp irradiation in 60 s. Comparatively, the LPM lamp required more than 10 min to achieve the same disinfection effect. Our data demonstrate that the 222-nm UVC excimer lamp has higher irradiance and a more potent microbial disinfection effect than the LPM lamp, requiring significantly less irradiation time to achieve the same disinfection effect under identical conditions. Furthermore, the 222-nm UVC excimer lamp exhibited a substantial disinfection effect on bacterial propagules at low temperatures. Our findings support the optimization of “tunnel-type” cold-chain goods disinfection devices, providing an alternative, highly efficient, and practical tool to combat the spread of SARS-CoV-2 through cold-chain systems. Graphical Abstract

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“…19−21 Of particular interest here are excimers, which generate deep UV emission when a rare gas or rare gas−halogen dimer returns to the ground state from its excited state, with the emission wavelength corresponding to the composition of the dimer. 22,23 KrCl* excimers emit narrow-band UV light at 222 nm and have recently been studied for use in disinfection, 20,24,25 greatly enhancing the disinfection of UV-resistant viruses, 26 including for control of SARS-CoV-2. 27−29 KrCl* excimers have advantages over conventional UV sources because they do not contain mercury and the far-UVC emission at 222 nm is not very harmful to human tissue, 30−32 thereby eliminating several hazards typically associated with conventional UV treatment of surfaces, air, and water.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Coinciding with the investigation of alternative radical promoters are advancements in UV source technology. Both germicidal UV light-emitting diodes and excimer (or exciplex) lamps have emerged in the past several decades as potential tools in UV-based water treatment technology. − Of particular interest here are excimers, which generate deep UV emission when a rare gas or rare gas–halogen dimer returns to the ground state from its excited state, with the emission wavelength corresponding to the composition of the dimer. , KrCl* excimers emit narrow-band UV light at 222 nm and have recently been studied for use in disinfection, ,, greatly enhancing the disinfection of UV-resistant viruses, including for control of SARS-CoV-2. − KrCl* excimers have advantages over conventional UV sources because they do not contain mercury and the far-UVC emission at 222 nm is not very harmful to human tissue, − thereby eliminating several hazards typically associated with conventional UV treatment of surfaces, air, and water. Few studies have exploited the unique wavelength emission of KrCl* excimers for improving advanced oxidation. − …”

Section: Introductionmentioning

confidence: 99%

UV 222 nm Emission from KrCl* Excimer Lamps Greatly Improves Advanced Oxidation Performance in Water Treatment

Payne

Liu

Mullen

et al. 2022

Environ. Sci. Technol. Lett.

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KrCl* excimer lamps emitting at 222 nm hold potential for enhancing ultraviolet (UV)-based advanced oxidation efficiency. Experiments were conducted in both ultrapure water and groundwater comparing low-pressure UV (LPUV) and KrCl* excimer lamps, with two different radical promoters [hydrogen peroxide (H 2 O 2 ) and nitrate (NO 3 − )]. Compared to that of conventional LPUV/H 2 O 2 , the steady-state hydroxyl radical (•OH) concentration achieved in the KrCl*/NO 3− UV/AOP was 13.1 times greater while that for the KrCl*/H 2 O 2 process was 9.4 times greater in ultrapure water; the values in groundwater were 7.3 and 3.7 times greater, respectively, all using a standard single probe compound decay method as a proxy for •OH radical generation. This work identified several research gaps that must be addressed to facilitate adoption of KrCl* for UV/AOP, including development of methods for comparing UV/AOPs that utilize different UV radiation sources and radical promoters, a need to acquire more information about direct photolysis quantum yields at 222 nm for contaminants of concern, and the impact of the background water matrix constituents on radical promotion or formation of any byproducts, especially in the presence of NO 3 − as a radical promoter.

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A novel water disinfection method based on dual-wavelength UV radiation of KrCl (222 nm) and XeBr (282 nm) excilamps

Cited by 13 publications

References 35 publications

Study on the inactivation and reactivation mechanism of pathogenic bacteria in aquaculture by UVC-LED

Study on the inactivation and reactivation mechanism of pathogenic bacteria in aquaculture by UVC-LED

Study on disinfection effect of a 222-nm UVC excimer lamp on object surface

UV 222 nm Emission from KrCl* Excimer Lamps Greatly Improves Advanced Oxidation Performance in Water Treatment

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