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Development of a new water sterilization device with a 365 nm UV-LED

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Abstract

Ultraviolet (UV) irradiation is an effective disinfection method. In sterilization equipment, a low-pressure mercury lamp emitting an effective germicidal UVC (254 nm) is used as the light source. However, the lamp, which contains mercury, must be disposed of at the end of its lifetime or following damage due to physical shock or vibration. We investigated the suitability of an ultraviolet light-emitting diode at an output wavelength of 365 nm (UVA-LED) as a sterilization device, comparing with the other wavelength irradiation such as 254 nm (a low-pressure mercury lam) and 405 nm (LED). We used a commercially available UVA-LED that emitted light at the shortest wavelength and at the highest output energy. The new sterilization system using the UVA-LED was able to inactivate bacteria, such as Escherichia coli DH5α, Enteropathogenic E. coli, Vibrio parahaemolyticus, Staphylococcus aureus, and Salmonella enterica serovar Enteritidis. The inactivations of the bacteria were dependent on the accumulation of UVA irradiation. Taking advantage of the safety and compact size of LED devices, we expect that the UVA-LED sterilization device can be developed as a new type of water sterilization device

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Acknowledgments

This study was supported by a grant-in-aid for scientific research (17790286) from the Ministry of Education, Science, Sports and Culture of Japan, the Human Nutritional Science on Stress Control 21st Century Center of Excellence Program (COE), an Industrial Technology Research Grant Program in 05A20001d from the New Energy and Industrial Technology Development Organization (NEDO) of Japan, and Practical Application Research from Japan Science and Technology Agency.

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Authors and Affiliations

  1. Department of Electrical and Electronic Engineering, Institute of Socio Techno Sciences, The University of Tokushima, Tokushima City, Tokushima, 770-8503, Japan

    Mirei Mori, Masatake Akutagawa & Yohsuke Kinouchi

  2. Department of Nutrition and Metabolism, Institute of Health Biosciences, The University of Tokushima Graduate School, Kuramoto-cho 3-18-15, Tokushima City, Tokushima, 770-8503, Japan

    Akiko Hamamoto, Akira Takahashi, Masayuki Nakano, Noriko Wakikawa, Satoko Tachibana & Yutaka Nakaya

  3. Department of Physiology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima City, Tokushima, 770-8503, Japan

    Toshitaka Ikehara

Authors
  1. Mirei Mori
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  2. Akiko Hamamoto
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  3. Akira Takahashi
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  4. Masayuki Nakano
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  5. Noriko Wakikawa
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  6. Satoko Tachibana
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  7. Toshitaka Ikehara
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  8. Yutaka Nakaya
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  9. Masatake Akutagawa
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  10. Yohsuke Kinouchi
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Corresponding author

Correspondence to Akira Takahashi.

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Mori, M., Hamamoto, A., Takahashi, A. et al. Development of a new water sterilization device with a 365 nm UV-LED. Med Bio Eng Comput 45, 1237–1241 (2007). https://doi.org/10.1007/s11517-007-0263-1

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  • DOI: https://doi.org/10.1007/s11517-007-0263-1

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