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AWWA ACE59981
- UV Disinfection of Indigenous Aerobic Spores for UV Reactor Validation
- Conference Proceeding by American Water Works Association, 06/17/2004
- Publisher: AWWA
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Conventional validation testing of ultraviolet (UV) reactors use cultured microorganismsspiked into test water flowing through a reactor. The objective of this study was to examinethe UV inactivation of indigenous aerobic spores naturally occurring in raw/unfilteredwater supplies and to assess their use as an alternative indicator for validation testing ofUV reactor performance. Spores were found in all raw waters tested in concentrationsranging between 20-12,000 CFU/100 ml and were very resistant to UV irradiation. Theinactivation of indigenous natural aerobic spores followed first order kinetics with aninactivation coefficient ranging between 0.013-0.022 cm<sup>2</sup>/mJ. It was determined thatnaturally occurring aerobic spores can be a useful tool when validating plantperformance, and can be used as a regular monitor of UV fluence and performance in awater treatment plant. Includes table, figures.
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