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Innovative Approach to Validation of Ultraviolet (UV) Reactors for Disinfection in Drinking Water Systems
Citation:
Adams, Jeff. Innovative Approach to Validation of Ultraviolet (UV) Reactors for Disinfection in Drinking Water Systems. To be Presented at ASCE 7th Civil Engineering Conference in the Asian Region, Oahu, HI, August 30 - September 02, 2016.
Impact/Purpose:
Slide presentation at Conference: ASCE 7th Civil Engineering Conference in the Asian Region
Description:
Slide presentation at Conference: ASCE 7th Civil Engineering Conference in the Asian Region. USEPA in partnership with the Cadmus Group, Carollo Engineers, and other State & Industry collaborators, are evaluating new approaches for validating UV reactors to meet groundwater & surface water pathogen inactivation including viruses for low-pressure and medium-pressure UV systems. Evaluation objectives of the study: Practical approach for validating LP and MP UV reactors for virus & cryptosporidium inactivation using various test microbes, i.e., MS2, B. pumilus, AD2, T1; Apply UV dose algorithms based on theory vs empirical that predict log-I and RED as a function of the UV sensitivity of the microbe (combined variable criteria), flow, lamp-sensor output, DL-ASCFs, w/wo UVT; Assess capabilities of test microbe for predicting target pathogen, assess credibility with second test microbe vs bracketing; Evaluate UV lamp sensor technology that accounts for germicidal contributions of low-and high-wavelength UV light within MP reactors; Address approaches for propagating and assaying AD2, B. pumilus, MS2, and methods for determining low and high wavelength ASCFs using collimated beam LP & MP UV lamps; Determine & apply low and high wavelength ASCFs to predict cryptosporidium and adenovirus credit using MS2, or B. pumilus, T1 test data; Simplify Validation-Factor (VF) analysis of uncertainties/biases; Develop recommendations document from recent lessons learned applicable to GWR / SWTR describing alternative approaches for UV validation and implementation, and changes needed from previous UVDGM.