UV Disinfection sensitivity index of spores or protozoa: A model to predict the required fluence of spores or protozoa

Article


Wang, Zhao, Tang, Walter Z., Sillanpää, Mika and Li, Jinze. 2022. "UV Disinfection sensitivity index of spores or protozoa: A model to predict the required fluence of spores or protozoa." Water Science and Technology. 86 (11), pp. 2820-2833. https://doi.org/10.2166/wst.2022.391
Article Title

UV Disinfection sensitivity index of spores or protozoa: A model to predict the required fluence of spores or protozoa

ERA Journal ID4696
Article CategoryArticle
AuthorsWang, Zhao, Tang, Walter Z., Sillanpää, Mika and Li, Jinze
Journal TitleWater Science and Technology
Journal Citation86 (11), pp. 2820-2833
Number of Pages14
Year2022
PublisherIWA Publishing
Place of PublicationUnited Kingdom
ISSN0273-1223
1996-9732
Digital Object Identifier (DOI)https://doi.org/10.2166/wst.2022.391
Web Address (URL)https://iwaponline.com/wst/article/86/11/2820/92199/UV-Disinfection-sensitivity-index-of-spores-or
Abstract

During UV disinfection, the required UV dose in terms of fluence depends upon the species of bacteria spore and protozoa. To rank their UV disinfection sensitivity, spore sensitivity index (SPSI) and protozoan sensitivity index (PSI) are defined. For spores, shoulder effect exists, therefore, SPSI is defined as the ratio between the ki of any spores for the linear portion of the dose response curve to the kir of Bacillus subtilis as the reference spore. After statistical analysis, the fluence of any spore can be predicted by SPSI through equation, H = (0.8358 ± 0.126)*LogI*SPSI + H0. PSI is defined as the ratio between the inactivation rate constants of a protozoa in reference to that of Cryptosporidium parvum. The equation predicting the fluence of any protozoa in reference to Cryptosporidium parvum is: H = 107.45*(3.86 ± 2.68)*LogI/PSI. Two regression equations suggest that protozoa require significantly higher UV dose than bacteria spores.

Keywordsspore; Bacillus subtilis and Cryptosporidium parvum as reference; protozoan; sensitivity index; UV disinfection
Byline AffiliationsLappeenranta University of Technology (LUT), Finland
Florida International University, United States
Duy Tan University, Vietnam
University of Southern Queensland
University of Johannesburg, South Africa
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