Resistance and Inactivation Kinetics of Bacterial Strains Isolated from the Non-Chlorinated and Chlorinated Effluents of a WWTP

disinfectant concentration (8, 20 and 30 mg.L-1), contact time (0, 15 and 30 min) and water temperature (20, 25 and 30 degrees C). The results demonstrated that the strains have independent responses to experimental conditions and that the most efficient treatment was an 8 mg.L-1 dose of disinfectant at a temperature of 20 degrees C for 30 min. The other eight strains, which were isolated from the chlorinated effluent, were used to analyze inactivation kinetics using the disinfectant at a dose of 15 mg.L-1 with various retention times (0, 10, 20, 30, 60 and 90 min). The results indicated that during the inactivation process, there was no relationship between removal percentage and retention time and that the strains have no common response to the treatments.