In order to respond to the stringent disinfection requirements for reclaimed wastewater in the United States, Ozonia North America (ONA) undertook a bioassay validation study of a lowpressure very high-output (LPVHO) ultraviolet (UV) disinfection system. The disinfection performance
of this process technology was verified via biodosimetry in accordance with the Ultraviolet Disinfection Guidelines for Drinking Water and Water Reuse, 2nd Edition(NWRI/AwwaRF, May 2003). The biodosimetry test program utilized full-scale reactors, having 36-lamps with
the goal to simplify extrapolation of the results to the field. Dose-flow relationships were obtained for both granular media-filtered and membrane-filtered wastewater reuse effluents. Although the influent velocity profiles were non-homogeneous during testing, the performance of the most
upstream reactor was not compromised and dose additivity with the number of reactors arranged in series was demonstrated. Based on the results of this verification testing, the LPVHO system can be sized for wastewater reuse applications using a ratio of target dose to dose delivered per
reactor. The bioassay validation report has been submitted to the State of California Department of Health Services for conditional acceptance of the use of the LPVHO process in reclaimed wastewater disinfection applications.
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