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Innovative Approaches for Validation of UV Disinfection Reactors for Drinking Water Systems
Citation:
Wright, H., T. Brooks, M. Heath, Jeff Adams, AND B. Townsend. Innovative Approaches for Validation of UV Disinfection Reactors for Drinking Water Systems. IN: UV Solutions, International Ultraviolet Association, Bethesda, MD, 18-27, (2020).
Impact/Purpose:
USEPA recently published the Report entitled "Innovative Approaches for Validation of Ultraviolet Disinfection Reactors for Drinking Water Systems." This document is the result of a four-year project, funded by USEPA, to develop and document new approaches for UV dose monitoring and validation that incorporates advances developed since the publication of the 2006 UV Disinfection Guidance Manual (UVDGM). Prior to publication, the document completed a two-year stakeholder review that was led by IUVA and included regulators, academia, consultants, and UV system manufactures. The final document was approved for publication based on the results of internal review by USEPA and external peer review. This article provides background on the drivers for the document and provides a summary of the key benefits for the UV industry. The monitoring approaches described in the “Innovative Approaches” document will improve the application of UV disinfection systems for the inactivation of Cryptosporidium, Giardia and viruses. The document provides a reference for new and enhanced validation methods developed since the publication of the UVDGM. These methods promote standardization and enhanced accuracy for UV dose monitoring, and in many cases, will simplify the application of UV disinfection. Other benefits of the document include: 1. Microbial methods for validation microbes other than MS2 phage and B. subtilis spores. 2. QA/QC bounds for the UV dose-response of MS2, T1UV, and T7 phage measured using a collimated beam apparatus (Figure 3). 3. Criteria to assess the robustness of a validation test plan, validation equation QA/QC and goodness-of-fit criteria, and criteria for defining and applying the validated range. 4. UV dose values for up to 6-log inactivation of Cryptosporidium, Giardia, and viruses, which is valuable for potable reuse applications of UV disinfection. 5. Criteria for using alternate UV lamps with improved output without the need to repeat full validation. 6. General recommendations for UV system validation and operation that improve the accuracy of UV dose monitoring.
Description:
USEPA recently published the Report entitled "Innovative Approaches for Validation of Ultraviolet Disinfection Reactors for Drinking Water Systems." This document is the result of a four-year project, funded by USEPA, to develop and document new approaches for UV dose monitoring and validation that incorporates advances developed since the publication of the 2006 UV Disinfection Guidance Manual (UVDGM). Prior to publication, the document completed a two-year stakeholder review that was led by IUVA and included regulators, academia, consultants, and UV system manufactures. The final document was approved for publication based on the results of internal review by USEPA and external peer review. This article provides background on the drivers for the document and provides a summary of the key benefits for the UV industry. The monitoring approaches described in the “Innovative Approaches” document will improve the application of UV disinfection systems for the inactivation of Cryptosporidium, Giardia and viruses. The document provides a reference for new and enhanced validation methods developed since the publication of the UVDGM. These methods promote standardization and enhanced accuracy for UV dose monitoring, and in many cases, will simplify the application of UV disinfection. Other benefits of the document include: 1. Microbial methods for validation microbes other than MS2 phage and B. subtilis spores. 2. QA/QC bounds for the UV dose-response of MS2, T1UV, and T7 phage measured using a collimated beam apparatus (Figure 3). 3. Criteria to assess the robustness of a validation test plan, validation equation QA/QC and goodness-of-fit criteria, and criteria for defining and applying the validated range. 4. UV dose values for up to 6-log inactivation of Cryptosporidium, Giardia, and viruses, which is valuable for potable reuse applications of UV disinfection. 5. Criteria for using alternate UV lamps with improved output without the need to repeat full validation. 6. General recommendations for UV system validation and operation that improve the accuracy of UV dose monitoring.
