Geri Döngü Akışlı Ultrasonik Reaktörde Ag+ ile Escherichia coli Dezenfeksiyonu

Abstract

After the recent pandemic process, disinfection/sterilization methods used for the control of infectious diseases have gained even more importance. The alternative disinfection studies like ultrasound (US) have been developing due to the various shortcomings of microbial inactivation processes such as chlorine application, ozone and ultraviolet radiation, which are widely applied for the prevention of epidemic diseases caused by pathogenic microorganisms. Within the scope of this study, disinfection treatments were carried out in recycled flow ultrasonic reactors operated at 22kHz, 36kHz and 833kHz ultrasonic frequencies using Escherichia coli bacteria indicated fecal contamination in the water sources. In this article, the combined usage of silver ions (0.1mM, 0.01 mM and 0.005 mM Ag+) and US (22 kHz, 36 kHz and 833 kHz ultrasonic frequencies) were mainly investigated using initial Escherichia coli bacteria concentration of 1x104 CFU/mL. As a result of the study, Escherichia coli was inactivated obtaining 4-log reduction with 22 kHz ultrasonic frequency with the minimum Ag+ concentrations. To conclude, the disinfection was effectively achieved with US and Ag+ methods, and higher Escherichia coli inactivation rate were obtained in US-Ag+ dual processes with faster decontamination time and lower Ag+ concentration due to their synergistic effects.