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Photonics 2016, 3(1), 7; doi:10.3390/photonics3010007

Efficient Disinfection of Tap and Surface Water with Single High Power 285 nm LED and Square Quartz Tube

Institute of Medical Engineering and Mechatronics, Ulm University of Applied Sciences, Albert-Einstein-Allee 55, 89081 Ulm, Germany
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Received: 21 December 2015 / Revised: 24 January 2016 / Accepted: 25 January 2016 / Published: 27 January 2016
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Abstract

A small water disinfection system based on the combination of a strong single 25 mW LED with a wavelength of 285 nm and a short quartz tube with an outer rectangular cross section is presented. For the disinfection tests clear tap water and slightly turbid and yellow pond water are contaminated with high concentrations of Escherichia coli bacteria. These water samples are exposed to the germicidal 285 nm LED radiation while they flow through the quartz tube. The portion of surviving germs is determined by membrane filtration for different water qualities and flow rates. For clear tap water the bacteria concentration can be reduced by at least three orders of magnitude up to flow rates of about 20 L/h. In pond water the maximum flow rate for such a reduction is less than 3 L/h. These high disinfection capabilities and the small size of this system, allow its integration in medical systems for point of use disinfection or even its application in the Third World for decentralized water disinfection powered by small solar cells, because this disinfection capacity should be sufficient for small groups or families. View Full-Text
Keywords: single high power 285 nm LED; square quartz tube; point of use disinfection; light guide single high power 285 nm LED; square quartz tube; point of use disinfection; light guide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hessling, M.; Gross, A.; Hoenes, K.; Rath, M.; Stangl, F.; Tritschler, H.; Sift, M. Efficient Disinfection of Tap and Surface Water with Single High Power 285 nm LED and Square Quartz Tube. Photonics 2016, 3, 7.

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