2019 Quarter 3 | 17 uvsolutionsmag.com Figure 1 (left). The Typhon BIO-310 UV Reactor. Figure 2 (right). Light penetration through the reactor for near uniform dose distribution. continued on page 18 Validation of a Reactor Containing UV LEDs for the Disinfection of Municipal Drinking Water Olivier Autin lead research scientist, Typhon Treatment Systems James R. Bolton president, Bolton Photosciences DRINKING WATER DISINFECTION FEATURED ARTICLE L ight-emitting diodes (LEDs) have attracted a great deal of attention in the UV world. The advantages of UV LEDs over traditional mercury lamps are now well established. However, until recently, their low output power has limited them to small-scale, point-of-use applications. Typhon Treatment Systems was founded in 2014 with the sole purpose of developing UV LED technologies to treat higher, continuous fow rates of water to suit municipal and industrial scale applications. At the time many felt this was too early, but the rapid development of UV LEDs over the last four years has enabled Typhon to validate its frst system, the BIO-310, in July 2018. This article presents the results of the validation of the BIO-310 LED UV reactor (Figure 1). The reactor was validated according to the US Environmental Protection Agency Ultraviolet Disinfection Guidance Manual (UVDGM 2006) with some adaptations from the more recent paper “Innovative Approaches for Validation of Ultraviolet Disinfection Reactors for Drinking Water Systems” (Wright 2018). The reactor The reactor design was optimized using optical modeling to maximize the light transmission into the fow cell. The reactor is composed of a Ø300 mm x 1.2 m-long quartz tube surrounded by an array of 1,000 lighting units, each comprising an LED light source and refector that directs the light to an optimized focal point, resulting in a near uniform irradiance through the full cross-section of the reactor (Figure 2). Twenty lighting units form a ring around the perimeter, with 50 rings along the length of the reactor delivering an even UV dose distribution. LG Innotek UV-C LEDs emitting a peak wavelength at 275 nm