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Water 2017, 9(1), 46;

UV-LEDs Efficiently Inactivate DNA and RNA Coliphages

Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI 70211 Kuopio, Finland
Department of Biology, College of Sciences for Women, University of Baghdad, 10071 Baghdad, Iraq
Author to whom correspondence should be addressed.
Academic Editor: Vincenzo Naddeo
Received: 29 September 2016 / Revised: 28 December 2016 / Accepted: 5 January 2017 / Published: 12 January 2017
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UV-LEDs are a new method of disinfecting drinking water. Some viruses are very resistant to UV and the efficiency of UV-LEDs to disinfect them needs to be studied. Drinking water was disinfected with UV-LEDs after spiking the water with MS2 and four UV- and/or Cl-resistant coliphages belonging to RNA or DNA coliphages isolated from municipal wastewater. UV-LEDs operating at a wavelength of 270 nm for 2 min with 120 mW of irradiation caused 0.93–2.73 Log10-reductions of coliphages tested in a reactor of a 5.2 L volume. Irradiation time of 10 min in the same system increased the Log10-reductions to 4.30–5.16. Traditional mercury UV (Hg-UV) lamp at a 254 nm wavelength caused 0.67–4.08 Log10-reductions in 2 min and 4.56–7.21 Log10-reductions in 10 min in 10 mL of water. All coliphages tested except MS2 achieved 4 Log10-reductions with UV-LEDs at a dose that corresponded to 70 mWs/cm2 using Hg-UV. Thus, UV-LEDs are a promising method of disinfecting UV- and/or Cl-resistant viruses. View Full-Text
Keywords: disinfection; DNA coliphages; Hg-UV; RNA coliphages; UV-LEDs; water disinfection; DNA coliphages; Hg-UV; RNA coliphages; UV-LEDs; water

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Zyara, A.M.; Heinonen-Tanski, H.; Veijalainen, A.-M.; Torvinen, E. UV-LEDs Efficiently Inactivate DNA and RNA Coliphages. Water 2017, 9, 46.

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