UV Light Source for Ozone Generation Equipped with Clean172™
By using an excimer lamp with a peak wavelength of 172 nm as the light source, ozone production equivalent to discharge ozone generation is possible without emission of nitrogen oxides (NOx). The 172 nm ultraviolet light and reactive oxygen species (e.g., ozone) enable deodorization※1, disinfection※1, TOC reduction, and chemical decomposition※2.
- ※1 It does not work on all bacteria and odors. The sterilizing effect works on bacteria exposed to ultraviolet light.
- ※2 This applies to substances such as: formaldehyde, acetaldehyde, trimethylamine*3, methyl ethyl ketone (MEK), methanol, ethylene oxide (EOG), ammonia*3, nicotine*3, etc.
- ※3 Please note: Because inorganic components are present, substances other than CO₂ and H₂O may be released.
Photopurification technology "Clean172™"
Clean172 is a technology that uses a 172 nm peak-wavelength excimer lamp to generate reactive oxygen species. The 172 nm light and these reactive species work together to enable powerful oxidative decomposition of the molecular bonds of odors and chemicals.
Oxidative decomposition process
172 nm light and its generated reactive oxygen species oxidatively decompose organic molecular bonds like odors.
Oxidative decomposition process
Application as a dispersion prevention measure (excerpt from presentation to the 2020 annual meeting of the Society of Indoor Environment, Japan)
The formaldehyde decomposition and removal technology using the Clean172 UV Light Source for Ozone Generation was applied as a dispersion prevention and control measure. Certified by the Ministry of Health, Labor and Welfare as a dispersion prevention and control measure under the Industrial Safety and Health Act’s Ordinance on Prevention of Hazards due to Specified Chemical Substances.
Example of working environment improvement using a demonstration unit
発表履歴
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| Conference name (year held) | Title of presentation | 著者 |
|---|---|---|
| The 2015 Annual Meeting of The Institute of Electrical Engineers Of Japan | Ozone generation in the vol% range by ultraviolet light and its characteristics | Keisuke Naito, Nobuyuki Hishinuma |
| The 92nd Annual Meeting of Japan Society for Occupational Health | Formaldehyde decomposition and working environment improvement using a VUV light irradiation module | Keisuke Naito, Goto Kazuhiro, Takahiro Nakaie1), Chie Yasuda1), Kazumasu Kiyohara2), Koji Yoshida2), Toru Ishidao3), Hajime Hori3) |
| The 32nd Annual Conference on Odor Environment | Odor components remaining in smoking room, after deodorizing according to differences in ozone generation method | Keisuke Naito, Sabatake kenichi, Tomoaki Taniguchi |
| The 4th Asian Network of Occupational Hygiene Conference 2019 | Decomposition of Formaldehyde in Working Environment by Excimer Lamp | Keisuke Naito, Kazuhiro Goto, Takahiro Nakaie1), Chie Yasuda1), Kazumasa Kiyohara2), Koji Yoshida2), Toru Ishidao3), Hajime Hori3) ( The First Runner-Up Poster Popularity ) |
| The 59th Meeting of the Japan Occupational Hygiene Association | Formaldehyde decomposition and working environment improvement using vacuum ultraviolet | Keisuke Naito, Goto Kazuhiro, Takahiro Nakaie1), Chie Yasuda1), Kazumasu Kiyohara2), Koji Yoshida2), Toru Ishidao3), Hajime Hori3) |
| The 92nd Annual Meeting of Japan Society for Occupational Health | Emission prevention and control measures for aldehydes and alcohols using excimer lamps | Keisuke Naito, Goto Kazuhiro, Takahiro Nakaie1), Chie Yasuda1), Toru Ishidao3), Hajime Hori3) |
| 2020 Annual Meeting of the Society of Indoor Environment, Japan | Aldehyde decomposition by excimer lamp | Keisuke Naito, Shoichi Terada, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1), Shinobu Yamamoto3), Toru Ishidao3), Hajime Hori3) |
| The 94th Annual Meeting of Japan Society for Occupational Health | Decomposition of nicotine using excimer lamps | Keisuke Naito, Shoichi Terada, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1), Shinobu Yamamoto3), Toru Ishidao3), Hajime Hori3) |
| American Industrial Hygiene Conference EXPO 2021 | Decomposition of formaldehyde by a photochemical ductless fume hood system | Keisuke Naito, Shoichi Terada, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1), Shinobu Yamamoto3), Toru Ishidao3), Hajime Hori3) |
| International Occupational Hygiene Association Conference 2021 | Ductless fume hood system for formaldehyde Photodecomposition | Keisuke Naito, Shoichi Terada, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1), Shinobu Yamamoto3), Toru Ishidao3), Hajime Hori3) |
| The 60th Meeting of the Japan Occupational Hygiene Association | Performance evaluation of a formaldehyde decomposition device using vacuum ultraviolet light | Keisuke Naito, Shoichi Terada, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1), Go Inokuchi4), Go Muto5), Haruo Hashimoto6) |
| 2021 Annual Meeting of the Society of Indoor Environment, Japan | Difference in aerosol production due to ozone-generation methods | Keisuke Naito, Sabatake kenichi, Kengo Nishio |
| American Industrial Hygiene Conference EXPO 2022 | Decomposition of formaldehyde in a photochemical ductless fume hood system equipped with an excimer vacuum-UV light source for industrial hygiene applications Ⅱ | Keisuke Naito, Shoichi Terada, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1),Go Inokuchi4), Go Muto5), Haruo Hashimoto6) |
| The 31st Annual Research Meeting of the Japan Ozone Association | Ozone generation by irradiating pressurized gas with Vacuum Ultraviolet rays | Keisuke Naito, Shoichi Terada, Kengo Nishio |
| The 35th Annual Conference on Odor Environment | Deodorizing effect of vacuum ultraviolet light on odors during microbial culture | Keisuke Naito, Shoichi Terada, Takayuki Suzuki, Kengo Nishio |
| The 61st Meeting of the Japan Occupational Hygiene Association | Environmental improvement of forensic sites using vacuum ultraviolet light | Keisuke Naito, Shoichi Terada, Takayuki Suzuki, Kengo Nishio, Takahiro Nakaie1), Chie Yasuda1), Go Inokuchi4), Go Muto5), Haruo Hashimoto6) |
| Study of ethylene oxide exposure mitigation and aeration time reduction using excimer lamps | Kengo Nishio, Keisuke Naito, Shoichi Terada, Takayuki Suzuki, Takahiro Nakaie1), Chie Yasuda1), Toru Ishidao3), Shinobu Yamamoto3), Hajime Hori3) |
|
| The 32nd Annual Research Meeting of the Japan Ozone Association | Generation of high concentration ozone by photoprocess with vacuum ultraviolet lamp | Keisuke Naito, Shoichi Terada, Akira Ishikura |
| The 6th Asian Network of Occupational Hygiene Conference | Decomposition of Ethylene Oxide Gas by photochemical reaction with Vacuum Ultraviolet lamp | Keisuke Naito, Shoichi Terada, Takahiro Nakaie1), Chie Yasuda1), Shinobu Yamamoto3), Toru Ishidao3), Hajime Hori3) |
| The 36th Annual Conference on Odor Environment | Deodorizing effect of vacuum ultraviolet light on putrid odors | Keisuke Naito, Shoichi Terada, Shoichiro Shikata |
| The 62nd Meeting of the Japan Occupational Hygiene Association | Improvement of working environment at embalming sites using vacuum ultraviolet light | Keisuke Naito, Shoichi Terada, Kengo Nishio, Taishi Kitazawa7), Toru Ishidao3), Shinobu Yamamoto3), Hajime Hori3) |
| 2023 Annual Meeting of the Society of Indoor Environment, Japan | Effects of far-ultraviolet and vacuum ultraviolet light on restroom odors | Keisuke Naito, Shoichi Terada, Shoichiro Shikata |
| OzonNews No.127, 2023-October | Ultraviolet light source capable of generating over 50 g/m³ of ozone from air feedstock: Ozone generation by irradiating pressurized gas with vacuum ultraviolet rays | Keisuke Naito |
| The 97th Annual Meeting of Japan Society for Occupational Health | Decomposition of fecal odor using excimer lamps | Keisuke Naito, Shoichiro Shikata, Takahiro Nakaie1), Chie Yasuda1), Toru Ishidao3), Shinobu Yamamoto3), Hajime Hori3) |
| The 33rd Annual Research Meeting of the Japan Ozone Association | Generation of high-concentration ozone by ultraviolet light and its characteristics in water treatment | Keisuke Naito, Akira Ishikura, Shoichiro Shikata |
| 2024 Annual Meeting of the Society of Indoor Environment, Japan | Analysis of aerosols generated by ozonizers at crime scene cleaners | Keisuke Naito, Shoichiro Shikata |
- 1) Kansai Kankyo Kagaku Co,.Ltd.
- 2) Showa Denki Co.,Ltd.
- 3) University of Occupational and Environmental Health School of Health Sciences
- 4) Chiba University, Education and Research Center of Legal Medicine
- 5) Kitasato University School of Medicine, Hygiene
- 6) Hashimoto Occupational Safety and Health Consultant Office
- 7) Kyoto Industrial Health Association
- * Names without annotation numbers are affiliated with USHIO INC.