Water disinfection by sonophotochemical method using persulfate

Abstract

The efficiency of water disinfection was investigated using advanced oxidation processes (AOPs) based on ultraviolet (UV) LEDs and high-frequency ultrasound (US) in the presence and absence of persulfate (PS). The hybrid oxidation system {UV+US+PS} was found to be the most effective for inactivating Enterococcus faecalis in a row: {UV+US+PS}>{UV+PS}>{UV+US}>{UV}>{US+PS}>{US}. The effect of US in this hybrid system for Escherichia coli was not observed and the systems {UV+US+PS} and {UV+PS} were equally effective. Complete inactivation (100%) of E. faecalis and E. coli by sonophotochemical method using PS was achieved after 10 - and 7-min treatment, respectively. We suppose that this method is promising for effective water disinfection.