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Fort Sill WWTP

Plant UV Disinfection Demonstration

Featured in IQ: 2015 Volume 7 Issue 1

Garver worked with the Fort Sill Wastewater Treatment Plant in Lawton, Oklahoma to provide the first application for a Category 2 wastewater reuse permit (unrestricted non-potable reuse) in the state. The Garver Water Team performed MS2 Bioassay testing of the germicidal ultraviolet (UV) equipment at the plant. Through measured inactivation of the injected MS2 coliphage, the team could calculate the available UV energy for disinfection in the system at varying treated flow rates.

To get the permit application approved, Garver performed on-site UV biodosimetry testing to demonstrate the capacity of the existing disinfection system for pathogen inactivation to the Oklahoma Department of Environmental Quality (ODEQ), and worked with the State to identify treatment goals (post-UV) with chlorine disinfection.

"This testing was, to my knowledge, the first time the National Water Research Institute On-Site UV Dose MS2 Bioassay was applied for a UV dose assessment (for wastewater or reuse permitting) in Oklahoma," said Dr. Michael Watts, Garver senior process engineer.

Now familiar with the testing through collaboration with Garver on the project, ODEQ recently added the testing as a requirement for UV disinfection design and construction for Category 2 reuse water disinfection.

"The project has demonstrated to Oklahoma wastewater utilities the success of a proven method for identifying the true disinfection performance of their existing UV systems, and a path toward validating this equipment for more stringent wastewater reuse permit requirements," said Watts.

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