Microbial risk assessment of drinking water based on hydrodynamic modelling of pathogen concentrations in source water
Journal article, 2015

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.

Water quality modelling

Quantitative microbial risk assessment

Discharge-based QMRA




Ekaterina Sokolova

Chalmers, Civil and Environmental Engineering, Water Environment Technology

S. R. Petterson

Water and Health Pty Ltd

Norwegian University of Life Sciences

O. Dienus

Ryhov County Hospital

F. Nyström

Ryhov County Hospital

Linköping University

P. E. Lindgren

Linköping University

Ryhov County Hospital

Thomas Pettersson

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Science of the Total Environment

0048-9697 (ISSN)

Vol. 526 177-186

Driving Forces

Sustainable development

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Water Engineering

Water Treatment

Oceanography, Hydrology, Water Resources





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5/2/2018 1