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Enhancement of water disinfection efficiency using uv radiation with the aid of a liquid-filmforming device

This study presents results for the use of UV radiation and a liquid-film-forming device (LFFD) for disinfection of water. Escherichia coli was used as a model microorganism for examining the bactericidal performance of UV. Bacterial inactivation was conducted in a disinfection apparatus with various conditions of UV dosages, air flow rates, and initial bacterial concentrations. Combined UV/LFFD treatments resulted in a greater inactivation efficiency than those for the UV treatment alone. Combined treatment with UV (UV dosage = 3.020×10-20 kJ/m2 , initial bacterial concentration = 1.1×105 – 2.2×105 CFU/mL, and room temperature) and LFFD (air flow rate = 2400 L/min) caused 89 % inactivation in terms of the bacterial load. In contrast, when the UV treatment alone was used under the same treatment condition, only 29% of the E. coli load was inactivated. These results suggest that the combined UV/LFFD treatments may be useful for water disinfection. | Enhancement of water disinfection efficiency using uv radiation with the aid of a liquid-filmforming device