Abstract
The aim of this paper was to propose a modeling system of water ultraviolet (UV) disinfection. Results reveal that application of the model of Chick-Watson in its original form or modified are not representative of the kinetics of disinfection. For this reason, the application of a new kinetic model of Collins-Selleck in UV inactivation of Pseudomonas aeruginosa in secondary wastewater appeared to be the best applied model. The modeling of the reactivation process at range of 7.5-50°C temperature was shown. First-order saturation does not fit the obtained data in photoreactivation; a modification of the model is proposed coinciding with the classical logistic equation. To better explain the process of inactivation, we have assumed that the action of disinfectant on the survival of lonely microorganisms is faster than its action on suspended solids protected or agglomerated to each other. For this reason, the application of a new kinetic model by introducing a third factor reflecting the influence of suspended solids in water on disinfection kinetics appeared to be determinant for modeling UV inactivation of P. aeruginosa in secondary treated wastewater. Key words: Secondary wastewater, ultraviolet (UV) disinfection, modeling, photoreactivation. Pseudomonas aeruginosa, suspended solids.
Highlights
Many pathogens are responsible for waterborne diseases
C: Concentration of disinfectant in the environment; K: A coefficient reflecting the specific case of disinfecting lethality potential; n: Coefficient of dilution, which is a function of disinfectant and pH of the medium and t: Exposure time to disinfect
Aeruginosa S1, S2 and S5, statistical analysis did not show any significant differences in bacterial reduction in conditions of darkness after different periods of exposure to laboratory light, suggesting that reactivation was not perceptible
Summary
Many pathogens are responsible for waterborne diseases. Currently, despite the development of molecular methods, most studies in this area were mainly focused on the concentration of fecal indicator bacteria to Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0International LicenseAbbreviations: FLW, Fermented liquid whey; LAB, lactic acid bacteria; MDA, malondialdihyde, MUFA, monounsaturated fatty acid; PUFA, polyunsaturated fatty acid; SFA, saturated fatty acid; TBARS, thiobarbituric acid reactive substance.Afr. J. Microbiol. Res.
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