Field demonstration of UV-LED disinfection at small and decentralized water facilities
Ultraviolet light-emitting diodes (UV-LED) can be a good option for disinfecting water in small and decentralized facilities. A flow-through UV-LED disinfection module was evaluated at three remote locations in Japan. The disinfection efficiency of the module was monitored for over one year, targeti...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-09-01
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| Series: | Journal of Water and Health |
| Subjects: | |
| Online Access: | http://jwh.iwaponline.com/content/21/9/1369 |
| _version_ | 1797661668175511552 |
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| author | Kumiko Oguma |
| author_facet | Kumiko Oguma |
| author_sort | Kumiko Oguma |
| collection | DOAJ |
| description | Ultraviolet light-emitting diodes (UV-LED) can be a good option for disinfecting water in small and decentralized facilities. A flow-through UV-LED disinfection module was evaluated at three remote locations in Japan. The disinfection efficiency of the module was monitored for over one year, targeting indigenous Escherichia coli, total coliforms, standard plate count, and heterotrophic plate count (HPC) bacteria. The physicochemical parameters of the source water, including UV transmittance (UVT), were also monitored to understand their natural fluctuation and impacts on UV disinfection. Overall, the UV-LED module showed efficient disinfection at all locations, achieving 2.7 log inactivation of E. coli at 30 L/min in a community-based water supply. HPC inactivation did not significantly differ among the three test sites (p > 0.01). One test site experienced a decrease in HPC inactivation after 10 months, whereas the other two sites did not show performance deterioration after one year. HPC inactivation was not correlated with the UVT of source water at any location, implying the difficulty to use UVT as a single parameter to predict disinfection efficiency in practical applications. This study demonstrates the effectiveness of UV-LED technology for water disinfection in small and decentralized water supply systems.
HIGHLIGHTS
A flow-through UV-LED disinfection module was field tested at three locations.;
The disinfection efficiency was statistically similar at all three test sites.;
Disinfection efficiency decreased over time at one test site while not at the others.;
UV transmittance and HPC inactivation were not significantly correlated.;
UV-LED is effective for water disinfection in small and decentralized systems.; |
| first_indexed | 2024-03-11T18:48:14Z |
| format | Article |
| id | doaj.art-c06f41abe30d4aa7879a5d11304f9280 |
| institution | Directory Open Access Journal |
| issn | 1477-8920 1996-7829 |
| language | English |
| last_indexed | 2024-03-11T18:48:14Z |
| publishDate | 2023-09-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Health |
| spelling | doaj.art-c06f41abe30d4aa7879a5d11304f92802023-10-11T15:20:41ZengIWA PublishingJournal of Water and Health1477-89201996-78292023-09-012191369138410.2166/wh.2023.192192Field demonstration of UV-LED disinfection at small and decentralized water facilitiesKumiko Oguma0 Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo. 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Ultraviolet light-emitting diodes (UV-LED) can be a good option for disinfecting water in small and decentralized facilities. A flow-through UV-LED disinfection module was evaluated at three remote locations in Japan. The disinfection efficiency of the module was monitored for over one year, targeting indigenous Escherichia coli, total coliforms, standard plate count, and heterotrophic plate count (HPC) bacteria. The physicochemical parameters of the source water, including UV transmittance (UVT), were also monitored to understand their natural fluctuation and impacts on UV disinfection. Overall, the UV-LED module showed efficient disinfection at all locations, achieving 2.7 log inactivation of E. coli at 30 L/min in a community-based water supply. HPC inactivation did not significantly differ among the three test sites (p > 0.01). One test site experienced a decrease in HPC inactivation after 10 months, whereas the other two sites did not show performance deterioration after one year. HPC inactivation was not correlated with the UVT of source water at any location, implying the difficulty to use UVT as a single parameter to predict disinfection efficiency in practical applications. This study demonstrates the effectiveness of UV-LED technology for water disinfection in small and decentralized water supply systems. HIGHLIGHTS A flow-through UV-LED disinfection module was field tested at three locations.; The disinfection efficiency was statistically similar at all three test sites.; Disinfection efficiency decreased over time at one test site while not at the others.; UV transmittance and HPC inactivation were not significantly correlated.; UV-LED is effective for water disinfection in small and decentralized systems.;http://jwh.iwaponline.com/content/21/9/1369community water supplydecentralized water systemlight-emitting diodeultraviolet disinfectionwater treatment |
| spellingShingle | Kumiko Oguma Field demonstration of UV-LED disinfection at small and decentralized water facilities Journal of Water and Health community water supply decentralized water system light-emitting diode ultraviolet disinfection water treatment |
| title | Field demonstration of UV-LED disinfection at small and decentralized water facilities |
| title_full | Field demonstration of UV-LED disinfection at small and decentralized water facilities |
| title_fullStr | Field demonstration of UV-LED disinfection at small and decentralized water facilities |
| title_full_unstemmed | Field demonstration of UV-LED disinfection at small and decentralized water facilities |
| title_short | Field demonstration of UV-LED disinfection at small and decentralized water facilities |
| title_sort | field demonstration of uv led disinfection at small and decentralized water facilities |
| topic | community water supply decentralized water system light-emitting diode ultraviolet disinfection water treatment |
| url | http://jwh.iwaponline.com/content/21/9/1369 |
| work_keys_str_mv | AT kumikooguma fielddemonstrationofuvleddisinfectionatsmallanddecentralizedwaterfacilities |