Sediment re-suspension as a potential mechanism for viral and bacterial contaminants
AuthorSassi, Hannah P.
van Ogtrop, Floris
Morrison, Christina M.
Duan, Jennifer G.
Gerba, Charles P.
AffiliationUniv Arizona, Water & Energy Sustainable Technol Ctr, Dept Soil Water & Environm Sci
Univ Arizona, Dept Civil Engn & Engn Math
KeywordsIrrigation water quality
health-related water microbiology
fate and transport
MetadataShow full item record
PublisherTAYLOR & FRANCIS INC
CitationSassi, H. P., van Ogtrop, F., Morrison, C. M., Zhou, K., Duan, J. G., & Gerba, C. P. (2020). Sediment re-suspension as a potential mechanism for viral and bacterial contaminants. Journal of Environmental Science and Health, Part A, 1-8.
JournalJOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
RightsCopyright © 2020 Taylor & Francis Group, LLC.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractPathogenic enteric viruses and bacteria tend to occur in higher concentrations and survive longer in aquatic sediments than suspended in the water column. Re-suspension of these organisms can result in a significant degradation of overlying water quality. Additionally, the re-suspension of microbial pathogens in artificial irrigation canals could endanger the consumption of fresh and ready-to-eat produce. Irrigation water has been implicated in numerous fresh produce outbreaks over the last 30 years. This study aimed to quantify the proportions of bacterial and viral re-suspension from sediment in a recirculating flume with varying velocities. MS2 coliphage andEscherichia coliwere found to re-suspend at rates that were not significantly different, despite organism size differences. However,E. colire-suspension rates from sand and clay were significantly different. This suggests that likely sediment-associated particles were recovered with the organisms attached. Similar re-suspension rates are hypothesized to be due to the dynamics of sediment transport, rather than that of the organisms themselves. This study also indicated that the re-suspension of sediment at very low velocities (e.g., less than 10 cm/s), could impact the microbiological quality of the overlaying water. Results from this study conclude that sediment could be a viable mechanism for irrigation water contamination.
Note12 month embargo; published online: 24 July 2020
VersionFinal accepted manuscript
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