2017 Conference Presentations on UV

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Posted on December 19, 2017

It was a busy year again for our VIQUA team, hitting the road to educate customers and association members about the need for disinfection, ultraviolet (UV) technology, and our great VIQUA products. Here are a few of the highlights:

Water Quality Association (WQA)

Anthony Oosterveld, Business Development Manager - Regulated Markets, Sales, kicked things off at the WQA convention in Orlando, Florida, providing training on ultraviolet disinfection for achieving virus credits in small drinking water systems (SDWS). He began by busting the myth that the 186 mJ/cm2 dose called for by the UVDGM to achieve a 4-log virus reduction was difficult to achieve with UV. He explained that UV systems are required to go through full-scale validation and that process needs to be repeatable, and utilize a readily accepted surrogate organism while also being cost-effective. It has long been believed that UV reactors placed in series provide a dose that is additive. Adding to this, recent research from the University of Toronto demonstrated that if a single reactor is validated with a microbe whose sensitivity is at least twice that of the target microbe, then when two of those identical reactors are placed in series the dose will be at least twice that of the single reactor. This proved that a familiar surrogate, MS2 phage could be relied on for 4-log virus validation of reactors in series. Anthony went on to call out the benefits of UV disinfection for SDWS compared to chlorination, which include no disinfection by-products, minimal footprint, and minimal technical requirements. And, of course, as a sales guy, he let slip Adenovirus_with_comm_ctre.jpgthat the PRO24-186 was designed for SDWS to achieve 4-log virus credit!

In a separate assembly, Anthony also presented a case study that illustrated how to work with regulatory agencies to introduce UV as an additional technology in the disinfection toolbox. The collaborative approach included a review of the pros and cons of both chlorination and ultraviolet. He encouraged water treatment professionals and engineers to advocate for UV disinfection to accelerate its adoption.

American Rainwater Catchment Systems Association (ARCSA)

shutterstock_273876887-560820-edited.jpgAgain in Orlando, but this time featuring Phil Jones, VIQUA’s seasoned Product Manager, those gathered for the ARCSA conference were provided an overview of the application of UV in rainwater systems. Though rainwater is naturally soft, that does not eliminate the need for pre-treatment when disinfecting with UV. The first flush system, before any storage tank, will remove obvious debris such as dirt and leaves. You can think of it as a “coarse-screen” filter. However, prior to the UV system, a nominal 5 micron sediment filter should be used. This “fine-screen” filter addresses turbidity in the water, which is critical to ensure optimal disinfection performance from the UV system, as turbid particles in the water can literally shield pathogens from the UV rays. Attendees were reminded that any rainwater collected for indoor uses should have some level of treatment, even if it’s only intended for laundry or toilet flushing. Treating for microbiological contaminants is recommended, and UV is an easy, chemical-free means of doing so. Lastly, his presentation touched on pending regulations expected by the end of 2018 that would call for UV protection on certain non-potable applications of rainwater and all potable ones.


National Groundwater Association (NGWA)

Moving on to Nashville, TN, it was again Anthony Oosterveld who presented some key factors of the Groundwater Rule as it relates Small Public Water Systems. Whether it’s a community water supply or a small business like a gas station that serves water to the public, these systems typically have limited space and minimal technical capacity and are often seeking low-cost solutions. Where the source water is groundwater (not under the influence of surface water), it is not mandatory to disinfect, but then the burden is to comply with water monitoring and testing requirements. Applying disinfection and, in particular, sufficient disinfection to achieve a 4-log virus reduction credit, can simplify their operations. Enter UV. UV is a simple, chemical-free, and newer systems validated to deliver the 186 mJ/cm2 dose required for 4-log virus credit are gaining acceptance with local regulators.