UV disinfection of indigenous aerobic spores: implications for UV reactor validation in unfiltered waters

Water Research
Hadas Mamane-Gravetz, Karl G Linden

Abstract

Conventional validation testing of UV reactors use cultured microorganisms spiked into test water flowing through a reactor. These tests are limited by the microbe titer it is possible to grow, thus limiting the size of the reactor it is possible to validate. The goal of this study was to examine the UV inactivation of indigenous aerobic spores naturally occurring in raw/unfiltered water supplies and to assess their use as an alternative indicator for validation testing of UV reactor performance, specifically for unfiltered water supplies planning large UV reactors. These spores were found in all raw waters tested in concentrations ranging between 20 and 12,000 CFU/100 mL and were very resistant to UV irradiation compared to a range of different microbes in the literature (i.e. adenovirus, MS-2 coliphage, and Cryptosporidium parvum). The inactivation of indigenous natural aerobic spores followed first-order kinetics with an inactivation coefficient ranging between 0.013 and 0.022 cm2/mJ with a high correlation coefficient. It was determined that naturally occurring aerobic spores, well characterized with respect to UV 253.7 nm inactivation, can be a useful tool when validating plant performance, and might also be used as a regu...Continue Reading

References

Jun 27, 2001·Applied and Environmental Microbiology·C P ChauretR C Andrews
Jun 27, 2001·Applied and Environmental Microbiology·G A ShinM D Sobsey

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Citations

Oct 6, 2006·Applied and Environmental Microbiology·Hannah S Shafaat, Adrian Ponce
Jul 10, 2007·Water Research·Eric CaronMichèle Prévost
Feb 7, 2007·Marine Environmental Research·Adriana de Abreu CorrêaCélia Regina Monte Barardi
Jan 15, 2015·Environmental Science & Technology·Shenghua ZhangXin Yu
Apr 27, 2021·Applied Microbiology and Biotechnology·Mamou DialloAna M López-Contreras

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