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Microbial risk assessment of drinking water based on hydrodynamic modelling of pathogen concentrations in source water
Chalmers, Sweden.
Norwegian University of Life Science NMBU, Norway; Water and Health Pty Ltd, Australia.
Ryhov County Hospital, Sweden.
Linköping University, Department of Clinical and Experimental Medicine, Division of Microbiology and Molecular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Ryhov County Hospital, Sweden.
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2015 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 526, 177-186 p.Article in journal (Refereed) Published
Abstract [en]

Norovirus contamination of drinking water sources is an important cause of waterborne disease outbreaks. Knowledge on pathogen concentrations in source water is needed to assess the ability of a drinking water treatment plant (DWTP) to provide safe drinking water. However, pathogen enumeration in source water samples is often not sufficient to describe the source water quality. In this study, the norovirus concentrations were characterised at the contamination source, i.e. in sewage discharges. Then, the transport of norovirus within the water source (the river Gota alv in Sweden) under different loading conditions was simulated using a hydrodynamic model. Based on the estimated concentrations in source water, the required reduction of norovirus at the DWTP was calculated using quantitative microbial risk assessment (QMRA). The required reduction was compared with the estimated treatment performance at the DWTP. The average estimated concentration in source water varied between 4.8 x 10(2) and 7.5 x 10(3) genome equivalents L-1; and the average required reduction by treatment was between 7.6 and 8.8 Log(10). The treatment performance at the DWTP was estimated to be adequate to deal with all tested loading conditions, but was heavily dependent on chlorine disinfection, with the risk of poor reduction by conventional treatment and slow sand filtration. To our knowledge, this is the first article to employ discharge-based QMRA, combined with hydrodynamic modelling, in the context of drinking water. (C) 2015 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier , 2015. Vol. 526, 177-186 p.
Keyword [en]
Water quality modelling; Norovirus; Quantitative microbial risk assessment; QMRA; Discharge-based QMRA
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:liu:diva-120205DOI: 10.1016/j.scitotenv.2015.04.040ISI: 000356224100017PubMedID: 25931024OAI: oai:DiVA.org:liu-120205DiVA: diva2:842701
Note

Funding Agencies|Graduate School on Environment and Health (Forskarskolan Miljo och Halsa) [RUN 612-0283-13]; Chalmers University of Technology; University of Gothenburg; Region Vastra Gotaland, Sweden; European Union project VISK (Interreg IV A programme) [00148715]; Swedish Water and Wastewater Association (Svenskt Vatten) [SVU 45-11]

Available from: 2015-07-21 Created: 2015-07-20 Last updated: 2016-04-11

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Nyström, FredrikLindgren, Per-Eric
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Division of Microbiology and Molecular MedicineFaculty of Medicine and Health Sciences
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