INACTIVATION OF ESCHERICHIA COLI IN WATER USING UV RADIATION WITH THE AID OF A LIQUID-FILM-FORMING APPARATUS

Abstract

Interest is growing in an advanced disinfection technique for water treatment without disinfection byproducts. This study presents results of using UV radiation and a liquid-film-forming apparatus (LFFA) for disinfection of Escherichia coli in water. The sensitivity of bacteria to the combined UV/LFFA treatment was examined under various conditions of UV dosages, air flow rates, and initial bacterial concentrations. Combined UV/LFFA treatments resulted in greater disinfection efficiency than those for the UV treatment alone. Combined treatment with UV (UV dosage = 41.67 mJ/cm2, and room temperature) and LFFA (air flow rate = 1.5 L/min) resulted in complete inactivation (5.4 log reduction) of E. coli within 60 min. In contrast, when the UV treatment was used at the same UV dosage, only 4.3 log reduction was achieved after 75 min. The findings could provide an effective method for enhanced bactericidal activity of UV radiation, to address recently emerging problems in water disinfection.

https://doi.org/10.26459/hueuni-jese.v129i4B.5819

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