Mechanistic modeling of UV and mild-heat synergistic effect on solar water disinfection

María Castro-Alférez, María Inmaculada Polo-López, Javier Marugán, P Fernandez-Ibanez

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A mechanistic model of inactivation of Escherichia coli by the action of solar UV radiation and simultaneous solar mild-heat occurring during solar water disinfection (SODIS) is proposed. Bacterial killing during solar exposure of transparent bottles full of contaminated water for at least 6 hours in full sunshine is attributed to the combined effect of, i) the UV photons absorbed by bacteria and producing intracellular reactive oxygen species (ROS) that induce oxidative damages, and ii) a mild increase of water temperature (commonly between 25°C and 50 °C) that accelerates the bacterial inactivation process. This work proposes a model based on a simplified approach of the kinetic reactions that explain the synergy between UV radiation and temperature to successfully reproduce SODIS experimental results. The main factors considered in this model are (i) the photo-induced formation of intracellular ROS from oxygen and photo-sensitizers that takes into account the internal thermal and photo-Fenton reactions; (ii) the thermal and photo-inactivation of catalase and superoxide dismutase and (iii) the internal damages due to the action of these oxidative and thermal effects. The new model has been demonstrated to reproduce the time-profile of E. coli concentration in clear water at different temperatures (10 – 55 °C) and under different solar irradiances (30 – 50 W m-2 UV). The excellent fitting between model and experimental results suggests that the mechanistic model considering the synergistic effect between UV radiation and temperature is a realistic approach for the simulation of solar water disinfection process.
LanguageEnglish
Pages111-120
JournalChemical Engineering Journal
Volume316
Early online date19 Jan 2017
DOIs
Publication statusPublished - 15 May 2017

Fingerprint

Disinfection
disinfection
Thermal effects
Water
Ultraviolet radiation
modeling
water
Escherichia coli
Oxygen
Reactive Oxygen Species
Temperature
damage
temperature
Bottles
reaction kinetics
Solar radiation
temperature effect
Reaction kinetics
Catalase
Superoxide Dismutase

Keywords

  • E. coli
  • SODIS
  • Model
  • Synergy
  • Thermal effect

Cite this

Castro-Alférez, María ; Polo-López, María Inmaculada ; Marugán, Javier ; Fernandez-Ibanez, P. / Mechanistic modeling of UV and mild-heat synergistic effect on solar water disinfection. 2017 ; Vol. 316. pp. 111-120.
@article{66216391f06c486290e39b7a6abc9155,
title = "Mechanistic modeling of UV and mild-heat synergistic effect on solar water disinfection",
abstract = "A mechanistic model of inactivation of Escherichia coli by the action of solar UV radiation and simultaneous solar mild-heat occurring during solar water disinfection (SODIS) is proposed. Bacterial killing during solar exposure of transparent bottles full of contaminated water for at least 6 hours in full sunshine is attributed to the combined effect of, i) the UV photons absorbed by bacteria and producing intracellular reactive oxygen species (ROS) that induce oxidative damages, and ii) a mild increase of water temperature (commonly between 25°C and 50 °C) that accelerates the bacterial inactivation process. This work proposes a model based on a simplified approach of the kinetic reactions that explain the synergy between UV radiation and temperature to successfully reproduce SODIS experimental results. The main factors considered in this model are (i) the photo-induced formation of intracellular ROS from oxygen and photo-sensitizers that takes into account the internal thermal and photo-Fenton reactions; (ii) the thermal and photo-inactivation of catalase and superoxide dismutase and (iii) the internal damages due to the action of these oxidative and thermal effects. The new model has been demonstrated to reproduce the time-profile of E. coli concentration in clear water at different temperatures (10 – 55 °C) and under different solar irradiances (30 – 50 W m-2 UV). The excellent fitting between model and experimental results suggests that the mechanistic model considering the synergistic effect between UV radiation and temperature is a realistic approach for the simulation of solar water disinfection process.",
keywords = "E. coli, SODIS, Model, Synergy, Thermal effect",
author = "Mar{\'i}a Castro-Alf{\'e}rez and Polo-L{\'o}pez, {Mar{\'i}a Inmaculada} and Javier Marug{\'a}n and P Fernandez-Ibanez",
year = "2017",
month = "5",
day = "15",
doi = "10.1016/j.cej.2017.01.026",
language = "English",
volume = "316",
pages = "111--120",

}

Mechanistic modeling of UV and mild-heat synergistic effect on solar water disinfection. / Castro-Alférez, María; Polo-López, María Inmaculada; Marugán, Javier; Fernandez-Ibanez, P.

Vol. 316, 15.05.2017, p. 111-120.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mechanistic modeling of UV and mild-heat synergistic effect on solar water disinfection

AU - Castro-Alférez, María

AU - Polo-López, María Inmaculada

AU - Marugán, Javier

AU - Fernandez-Ibanez, P

PY - 2017/5/15

Y1 - 2017/5/15

N2 - A mechanistic model of inactivation of Escherichia coli by the action of solar UV radiation and simultaneous solar mild-heat occurring during solar water disinfection (SODIS) is proposed. Bacterial killing during solar exposure of transparent bottles full of contaminated water for at least 6 hours in full sunshine is attributed to the combined effect of, i) the UV photons absorbed by bacteria and producing intracellular reactive oxygen species (ROS) that induce oxidative damages, and ii) a mild increase of water temperature (commonly between 25°C and 50 °C) that accelerates the bacterial inactivation process. This work proposes a model based on a simplified approach of the kinetic reactions that explain the synergy between UV radiation and temperature to successfully reproduce SODIS experimental results. The main factors considered in this model are (i) the photo-induced formation of intracellular ROS from oxygen and photo-sensitizers that takes into account the internal thermal and photo-Fenton reactions; (ii) the thermal and photo-inactivation of catalase and superoxide dismutase and (iii) the internal damages due to the action of these oxidative and thermal effects. The new model has been demonstrated to reproduce the time-profile of E. coli concentration in clear water at different temperatures (10 – 55 °C) and under different solar irradiances (30 – 50 W m-2 UV). The excellent fitting between model and experimental results suggests that the mechanistic model considering the synergistic effect between UV radiation and temperature is a realistic approach for the simulation of solar water disinfection process.

AB - A mechanistic model of inactivation of Escherichia coli by the action of solar UV radiation and simultaneous solar mild-heat occurring during solar water disinfection (SODIS) is proposed. Bacterial killing during solar exposure of transparent bottles full of contaminated water for at least 6 hours in full sunshine is attributed to the combined effect of, i) the UV photons absorbed by bacteria and producing intracellular reactive oxygen species (ROS) that induce oxidative damages, and ii) a mild increase of water temperature (commonly between 25°C and 50 °C) that accelerates the bacterial inactivation process. This work proposes a model based on a simplified approach of the kinetic reactions that explain the synergy between UV radiation and temperature to successfully reproduce SODIS experimental results. The main factors considered in this model are (i) the photo-induced formation of intracellular ROS from oxygen and photo-sensitizers that takes into account the internal thermal and photo-Fenton reactions; (ii) the thermal and photo-inactivation of catalase and superoxide dismutase and (iii) the internal damages due to the action of these oxidative and thermal effects. The new model has been demonstrated to reproduce the time-profile of E. coli concentration in clear water at different temperatures (10 – 55 °C) and under different solar irradiances (30 – 50 W m-2 UV). The excellent fitting between model and experimental results suggests that the mechanistic model considering the synergistic effect between UV radiation and temperature is a realistic approach for the simulation of solar water disinfection process.

KW - E. coli

KW - SODIS

KW - Model

KW - Synergy

KW - Thermal effect

U2 - 10.1016/j.cej.2017.01.026

DO - 10.1016/j.cej.2017.01.026

M3 - Article

VL - 316

SP - 111

EP - 120

ER -