Evaluation of disinfection efficacy of single UV-C, and UV-A followed by UV-C LED irradiation on Escherichia coli, B. spizizenii and MS2 bacteriophage, in water

Nyangaresi, Paul Onkundi; Rathnayake, Thusitha; Beck, Sara E.

doi:10.1016/j.scitotenv.2022.160256

Cited by 18 publications

(3 citation statements)

References 37 publications

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“…Specifically, the hierarchy of LRV values was as follows: 280 > 365 > 254 nm. This paper contributes to the database of studies demonstrating that 280 ± 2 nm has improved performance over 254 nm as a wavelength for disinfection for challenge microorganisms. , …”

Section: Resultsmentioning

confidence: 99%

Comparison of Legionella pneumophila and Pseudomonas fluorescens Quantification Methods for Assessing UV LED Disinfection

Lara de Larrea,

MacIsaac,

Rauch

et al. 2023

ACS EST Water

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This study assesses the efficacy of ultraviolet light-emitting diodes (UV LEDs) for deactivating Legionella pneumophila (pure culture) and Pseudomonas fluorescens (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 P. fluorescens 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 L. pneumophila 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.

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Section: Resultsmentioning

confidence: 99%

Comparison of Legionella pneumophila and Pseudomonas fluorescens Quantification Methods for Assessing UV LED Disinfection

Lara de Larrea,

MacIsaac,

Rauch

et al. 2023

ACS EST Water

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“…Inactivation of microorganisms using UV light has been actively studied with mercury lamps such as low-pressure mercury lamp and medium pressure mercury lamp [ [20] , [21] , [22] ], tunable wavelength lasers [ [23] , [24] , [25] ], and light emitting diodes (LEDs). In recent years, UV-LEDs have attracted attention for utilization in a broad field such as water, food and room because the broad range of wavelengths; the compact form factor, providing design flexibility; the longevity of the effect; the adjustable output, which can be controlled by driving current; and the environmental friendliness of the approach, without production of hazardous wastes, such as mercury [ [26] , [27] , [28] ]. Evaluations of UV sensitivity is based on how the object changes in response to UV dose, which is the product of irradiance and irradiation time; therefore, it is necessary to accurately determine the irradiance of the target surface and set an appropriate irradiation time.…”

Section: Introductionmentioning

confidence: 99%

Development of a standard evaluation method for microbial UV sensitivity using light-emitting diodes

Ishida,

Onoda,

Kadomura-Ishikawa

et al. 2024

Heliyon

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“…Modeling the kinetics of inactivation can significantly reduce the number of tests required to determine the efficiency of a UV-C reactor [48]. However, recent studies mention that the UV-C LED irradiation process can be promising in the inactivation of pathogens; for this purpose, it is relevant to study the mathematical prediction of this process [49]. In addition, Atilgan et al [48], Ghate et al [35], Unluturk et al [38], Baysal et al [13] and Pratap-singh et al [9] concluded that the effect of UV irradiation on the inactivation of pathogenic bacteria and spores was efficient and the experimental data were well fitted with the Weibull model.…”

Section: Introductionmentioning

confidence: 99%

Effect of Optimized UV-LED Technology on Modeling, Inactivation Kinetics and Microbiological Safety in Tomato Juice

Salazar,

Pizarro-Oteíza,

Molinett

et al. 2024

Foods

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This research analyzed, optimized and modeled the inactivation kinetics of pathogenic bacteria (PB1: Escherichia coli O157:H7 and PB2: Listeria monocytogenes) and determined the microbiological safety of tomato juice processed by UV-LED irradiation and heat treatment. UV-LED processing conditions were optimized using response surface methodology (RSM) and were 90% power intensity, 21 min and 273–275 nm (251 mJ/cm2) with R2 > 0.96. Using the optimal conditions, levels of PB1 and PB2 resulted a log reduction of 2.89 and 2.74 CFU/mL, respectively. The Weibull model was efficient for estimating the log inactivation of PB1 and PB2 (CFU/mL). The kinetic parameter δ showed that 465.2 mJ/cm2 is needed to achieve a 90% log (CFU/mL) reduction in PB1 and 511.3 mJ/cm2 for PB2. With respect to the scale parameter p > 1, there is a descending concave curve. UV-LED-treated tomato juice had an 11.4% lower Listeria monocytogenes count than heat-treated juice on day 28 (4.0 ± 0.82 °C). Therefore, UV-LED technology could be used to inactivate Escherichia coli O157:H7 and Listeria monocytogenes, preserving tomato juice for microbiological safety, but studies are required to further improve the inactivation of these pathogens and analyze other fruit and vegetable juices.

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Evaluation of disinfection efficacy of single UV-C, and UV-A followed by UV-C LED irradiation on Escherichia coli, B. spizizenii and MS2 bacteriophage, in water

Cited by 18 publications

References 37 publications

Comparison of Legionella pneumophila and Pseudomonas fluorescens Quantification Methods for Assessing UV LED Disinfection

Comparison of Legionella pneumophila and Pseudomonas fluorescens Quantification Methods for Assessing UV LED Disinfection

Development of a standard evaluation method for microbial UV sensitivity using light-emitting diodes

Effect of Optimized UV-LED Technology on Modeling, Inactivation Kinetics and Microbiological Safety in Tomato Juice

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