Citation:

Brooks, T., H. Wright, M. Heath, L. Hills, AND Jeff Adams. Implementing Ultraviolet (UV) Disinfection for Treatment of Groundwater for Small and Medium Sized Utilities - abstract. Presented at 2014 Water Quality Technology Conference, New Orleans, LA, November 16 - 20, 2014.

Impact/Purpose:

USEPA in conjunction with the Cadmus Group and Carollo Engineers, have initiated a study to develop a simplified approach to validation of UV reactors used for small and medium size drinking water systems to meet the virus inactivation requirements of the Ground Water Rule (GWR). The scope of the project is to evaluate validation testing protocols for low pressure high output (LPHO) and medium pressure (MP) UV systems, evaluate simplified dose monitoring approaches, and in the case of polychromatic (MP) UV systems, evaluate the implications of the germicidal impacts of low wavelength light on virus inactivation.

Description:

This presentation will focus on validation testing performed on a three-lamp low-pressure high-output (LPHO) TrojanUVSwiftTM UV reactor using MS2, Bacillus Pumilus, and live adenovirus as the test microbes. An adjustable sensor was used to help determine the optimal sensor location. The testing was performed at a range of UVTs between 70 and 98% and flowrates between 12 and 860 gpm. A hybrid dose-monitoring equation combining aspects of UV intensity setpoint approach and the calculated UV dose approach was developed to analyze the dataset. This hybrid dose-monitoring equation includes the combined variable S/S0/Q/DL, where S/S0 is the relative lamp output, Q is the flowrate, and DL is the UV sensitivity of the microbe defined as the UV dose required per log inactivation

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