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Instantaneous Water Purification by Deep Ultraviolet Light in Water Waveguide: Escherichia Coli Bacteria Disinfection

1
Graduate School of Design and Architecture, Nagoya City University, 2-1-10 Kita Chikusa, Nagoya 464-0083, Japan
2
Department of Bacteriology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Nagoya 467-8601, Japan
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 968; https://doi.org/10.3390/w11050968
Received: 19 March 2019 / Revised: 27 April 2019 / Accepted: 5 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Water Disinfection: Safe Water for All)
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Abstract

The necessity of small water purification equipment has been increasing in recent years as a result of frequent natural disasters. Ultraviolet (UV) radiation treatment is an effective method for the disinfection of bacterial contaminants in water. As an emerging technology, disinfection by deep-ultraviolet light-emitting diodes (DUV-LEDs) is promising. Few studies have used the point-source characteristics of LEDs and have instead replaced mercury vapor lamps with LEDs. Here, we demonstrate the instantaneous purification of contaminated water by combining the point source characteristics of DUV-LEDs with a water waveguide (WW). The principle is based on the WW region acting as an effective DUV disinfector, whereby a high UV dose in a confined WW region can be applied to bacterial contaminants in a short period of time (around one second). We demonstrate the effect of this DUV-LED WW disinfection technique by showing the results of 3-log disinfection levels of water contaminated with Escherichia coli bacteria after a short treatment time. We believe that the combination of the point-source nature of DUV-LED emission, the water-waveguide effect, and a small photovoltaic cell paves the way toward environmentally friendly and emergency preparedness portable water purification equipment that instantaneously supplies clean water just before drinking. View Full-Text
Keywords: water; disinfection; bacteria; waveguide; deep-ultraviolet; light-emitting diode; Escherichia coli water; disinfection; bacteria; waveguide; deep-ultraviolet; light-emitting diode; Escherichia coli
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Matsumoto, T.; Tatsuno, I.; Hasegawa, T. Instantaneous Water Purification by Deep Ultraviolet Light in Water Waveguide: Escherichia Coli Bacteria Disinfection. Water 2019, 11, 968.

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