AWWA WQTC58957

In 2003, the Clayton County Water Authority (CCWA) completed construction of ultraviolet (UV) disinfection facilities for enhanced disinfection and public health protection at their three water production plants in Georgia. The CCWA's UV disinfection facilities were specifically designed to inactivate Cryptosporidium oocysts that may be present in their surface water supplies. The CCWA's schedule for implementation of UV disinfection required that the facilities be designed and constructed prior to the development of specific guidance from the United States Environmental Protection Agency (USEPA). In this paper, the issues associated with the full-scale, on-site validation testing completed at the CCWA's Freeman Road plant are described. This paper describes the test procedure, experimental data, findings, and the trouble-shooting necessary to achieve meaningful results. Conducting validation testing on-site increases flexibility and has the potential to result in cost savings for utilities, but there are also many issues that must be successfully managed to achieve useful and meaningful results. This paper includes important information related to the feasibility, effectiveness, and interpretation of results from on-site UV validation testing at a water treatment plant with multiple disinfection barriers. Includes 8 references, tables, figure.