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Inactivation of Microbiological Contaminants in Drinking Water by Ultraviolet Light Technology: NeoTech Aqua Solutions, Inc.; Ultraviolet Water Treatment System, NeoTech D438™ (Report and VS)
Citation:
Adams, Jeff AND B. Bartley. Inactivation of Microbiological Contaminants in Drinking Water by Ultraviolet Light Technology: NeoTech Aqua Solutions, Inc.; Ultraviolet Water Treatment System, NeoTech D438™ (Report and VS). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-13/096, 2013.
Impact/Purpose:
The purpose of the ETV testing was to validate using the set line approach the ultraviolet light (UV) dose delivered by the NeoTech Aqua Solutions Inc. (NeoTech) Ultraviolet Water Treatment System Model D438 (NeoTech D438™) as defined by these regulatory authorities and their guidelines and regulations: • Water Supply Committee of the Great Lakes--Upper Mississippi River Board of State and Provincial Public Health and Environmental Managers otherwise known as The Ten States Standards 2012; • The Norwegian Institute of Public Health (NIPH) and its guidelines; and • The New York Department of Health (NYDOH) and its code. Another purpose was to use the same data set to calculate the log inactivation of a target pathogen such as Cryptosporidium and Giardia using the Generic Protocol for Development of Test / Quality Assurance Plans for Validation of Ultraviolet (UV) Reactors, August 2011 11/01/EPADWCTR (GP-2011) which is based on Ultraviolet Design Guidance Manual For the Long Term 2 Enhanced Surface Water Treatment Rule, Office of Water, US Environmental Protection Agency, November 2006, EPA 815-R-06-007 (UVDGM-2006).
Description:
The NeoTech Aqua Solutions, Inc. D438™ UV Water Treatment System was tested to validate the UV dose delivered by the system using biodosimetry and a set line approach. The set line for 40 mJ/cm2 measured Reduction Equivalent Dose (RED) was based on validation testing at three (3) set points. A set point is defined at a single flow rate and irradiance output that delivers the targeted UV dose. The results of the three set point tests were used to develop the setline that defined the maximum flow rate and minimum irradiance output required to ensure that a 40 mJ/cm2 measured RED is achieved. The microorganism used for the validation was MS2 coliphage virus. NeoTech Aqua Solutions selected flow rates for testing of 150, 250, and 435 gpm based on the unit design and preliminary screening tests. The lowest irradiance tested was 7.9 mW/cm2 which occurred with full power to the unit, at a flow rate of 151 gpm, and a feed water ultraviolet transmissionUltraviolet Transmission (UVT) of 91%. The measured RED was adjusted for RED bias and uncertainty to determine the validation factor for calculating log inactivation of Cryptosporidium. The validation factor (VF) and validated dose calculations were performed as specified in the USEPA Ultraviolet Design Guidance Manual (UVDGM-2006). Based on the results of these tests and the calculated validation factor, the NeoTech D438™ achieved a minimum of 3.5-log reduction credit for Cryptosporidium at the test flow rates and corresponding irradiance levels. The validation factors for log inactivation credit for Giardia were also calculated and the NeoTech D438™ also achieved a minimum of 3.5-log reduction credit for Giardia at the test conditions.
URLs/Downloads:
Inact Microbiol Contam in DW by Ultraviolet Light Technol (Rept)Inact Microbiol Contam in DW by Ultraviolet Light Technol (VS)