ENHANCEMENT OF WATER DISINFECTION EFFICIENCY USING UV RADIATION WITH THE AID OF A LIQUID-FILM-FORMING DEVICE

Authors

  • Dang Thi Thanh Loc Department of Environmental Science, Hue University of Sciences, Hue University
  • Le Van Tuan Department of Environmental Science, Hue University of Sciences, Hue University
  • Hidenori Harada Graduate School of Global Environmental Studies, Kyoto University
  • Duong Van Hieu Department of Environmental Science, Hue University of Sciences, Hue University
  • Pham Khac Lieu Department of Environmental Science, Hue University of Sciences, Hue University
  • Duong Thanh Chung Department of Environmental Science, Hue University of Sciences, Hue University

DOI:

https://doi.org/10.15625/2525-2518/58/3A/14420

Keywords:

bactericidal inactivation, UV radiation, Escherichia coli, water disinfection, liquid-film-forming device.

Abstract

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 LFFD with various condition 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 was used, only 29% of the E. coli load was inactivated. These findings suggest that the combined UV/LFFD treatments could provide a promising method for water disinfection.

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Published

2020-05-25

Issue

Section

INTERNATIONAL FORUM ON GREEN TECHNOLOGY AND MANAGEMENT (IFGTM2021)