UV Disinfection of Secondary Wastewater: Influence of Photoreactivation on the Kinetics of Inactivation of Pseudomonas aeruginosa
The aim of this paper is to recommend a kinetic model related to UV disinfection of the secondary treated
wastewater. Results revealed that application of the model of Chick-Watson in its original form is not representative of the
kinetics of disinfection. Modification considering the speed change during the disinfection has not significantly improved
the results. According to the parameter ε representing, the difference between the experimental and the calculated values
using the model of Chick-Watson in its original form appeared feeble for all bacterial strains studied. Thus, we see
therefore that the model of Collins-Selleck was most effective in considering the change in the kinetics of inactivation
during the disinfection. Also, we found for the most strains of Pseudomonas aeruginosa tested that the model of Hom
showed a great agreement to describe the kinetics of UV disinfection. Modeling the reactivation at the range of
temperature of 7.5-50°C was presented. First-order saturation model does not fit the obtained data of photoreactivation; a
modification of the model is recommended which coincides with the classical logistic equation.
Keywords: Secondary wastewater, disinfection, modeling, UV irradiation, kinetic, photoreactivation, pathogenic, UV254, UV transmittance, Chick-Watson model, Collins-Selleck, kinetic parameters, correlation, regression, inactivation.
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