Modelling of reactivation after UV disinfection: Effect of UV-C dose on subsequent photoreactivation and dark repair

Nebot, Enrique; Dávila, Inmaculada Salcedo; Balao, J.A. Andrade; Alonso, J. M. Quiroga

doi:10.1016/j.watres.2007.04.008

Cited by 122 publications

(26 citation statements)

References 24 publications

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“…Note that k 2 is not a pure repair rate constant, it is rather a model parameter that is adjusted to predict the experimental data whose physical meaning is related to the time required to reach S m and then the stabilization phase [38,39]. Therefore, a pure repair rate constant, K (Eq.…”

Section: Repair Kinetics 2221 Modeling Photo-repairmentioning

confidence: 99%

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Nyangaresi¹,

Zhang²,

Shen³

2020

E. Coli Infections - Importance of Early Diagnosis and Efficient Treatment

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Ultraviolet light-emitting diode (UV-LED) is a newly emerging UV light source with a potential of replacing the conventional chemical methods, mercury UV lamps and xenon lamps in water disinfection applications. In this chapter, we will first give a general description on the status of E. coli disinfection in water by UV-LEDs. Then the main text will concentrate on our experimental studies. We will discuss the effects of single and combined UV-LED irradiation on E. coli in water, including the inactivation efficiency, the recover percentage after the UV-LED irradiation, the optimal wavelength for low energy consumption, differences in pulsed and continuous operations of UV-LEDs, effect of UVA-LED followed by UVC-LED irradiation and vice versa, and finally the effect of TiO 2-assisted photocatalytic disinfection.

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Section: Repair Kinetics 2221 Modeling Photo-repairmentioning

confidence: 99%

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Nyangaresi¹,

Zhang²,

Shen³

2020

E. Coli Infections - Importance of Early Diagnosis and Efficient Treatment

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“…should be one theoretically. In reality, however, uncertainty in measurement of H and the corresponding inactivation rate constants k i , which depends upon the accuracy of fluence measured will result in the slope different from one [13,14,16,18,19]. Third, when the approximated shoulder H 0 from the intercept of the linear portion at the Log I = 0 is used to replace the actual SB, uncertainty of the coefficient, a, also increases.…”

Section: Tablementioning

confidence: 99%

Bacteria sensitivity index of UV disinfection of bacteria with shoulder effect

Tang

Sillanpää

2015

Journal of Environmental Chemical Engineering

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“…Growth rate and modifications of the enzyme profile by osmotic stress are two factors affecting the specific resistance of the organisms to the UV treatment . However, the organisms have photoreactivation mechanisms that repair the DNA damage caused by the UV irradiation to a great extent if treated organisms are released into an illuminated environment . Other features are also involved in the UV treatment of seawater such as the mechanical stress caused by the pumping in dynamic UV devices …”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] However, the organisms have photoreactivation mechanisms that repair the DNA damage caused by the UV irradiation to a great extent if treated organisms are released into an illuminated environment. 12,13 Other features are also involved in the UV treatment of seawater such as the mechanical stress caused by the pumping in dynamic UV devices. [14][15][16] The efficacy of the UV treatment is commonly evaluated through the disinfection profiles expressed as dose-survival curves.…”

Section: Introductionmentioning

confidence: 99%

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Romero-Martínez

Duque-Sarango

Acevedo-Merino

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Industrial and commercial activities may require seawater disinfection for which ultraviolet (UV) irradiation is a widely used technology. Ultraviolet devices are commonly used in laboratory to evaluate the disinfection efficacy, looking for the highest control of the experimental conditions such as collimated beam reactor or continuous flow reactors with recirculation. However, commercial applications usually require the application of the UV treatment by means of one single pass through the reactor. The objective in this article is to evaluate and compare the efficacy achieved by two different continuous flow systems, i.e. single‐pass and recirculation devices, on bacteria in buffered distilled and seawater matrices. RESULTS Survival data obtained with a single‐pass device followed by disinfection kinetics according to the log‐linear + shoulder model, requiring a dose of 5.87 mJ cm−2 to inactivate one log unit of the initial concentration of the pure strain Escherichia coli ATCC 11229. The survival achieved with a recirculation reactor followed by a biphasic model, required 12.86 mJ cm−2 to inactivate one log unit of the initial concentration and showed loss of efficacy at higher doses. There was substantial loss of the inactivating efficacy in the treatment of bacteria in seawater using the recirculation device. Natural populations of Escherichia coli and Enterococcus sp. were more sensitive to the UV treatment. CONCLUSION According to the obtained data and their comparison with previous experiments in the literature, the single‐pass prototype is a better approach for determining the inactivating efficacy of UV systems, in comparison with collimated beam and recirculation devices. © 2019 Society of Chemical Industry

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Modelling of reactivation after UV disinfection: Effect of UV-C dose on subsequent photoreactivation and dark repair

Cited by 122 publications

References 24 publications

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Bacteria sensitivity index of UV disinfection of bacteria with shoulder effect

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

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