AWWA JAW60539

The Clayton County (Georgia) Water Authority (CCWA) has installed ultraviolet (UV) disinfectionsystems at three water treatment plants. The CCWA's projects were designed, constructed, andtested in advance of publication of the proposed Ultraviolet Disinfection Guidance Manual(UVDGM) by the US Environmental Protection Agency (USEPA) in June 2003. Onsite validationtesting was successfully completed at the three facilities early in 2003. Following the publicationof the proposed UVDGM, the UV system configuration and validation results for the CCWA'sFreeman Road plant were analyzed under the UVDGM framework. A comparison to the Tier 1requirements indicated that not all criteria were met, making a Tier 2 analysis necessary. Fromthe Tier 2 analysis, the UV safety factors and dose requirement were reduced by approximately12% compared with the proposed Tier 1 dose requirement. These analyses showed that the CCWAsystems are surpassing all potentially applicable USEPA requirements, and the CCWA isproviding enhanced public health protection as intended at project inception. As a result of theseanalyses, significant comments, focused on simplifying the proposed UVDGM and enhancingits ease of use, were submitted to the USEPA. Includes 24 references, tables, figures.

Product Details

Edition:

Vol. 96 - No. 10

Published:

10/01/2004

Number of Pages:

14

File Size:

1 file , 370 KB