Accounting for Unexpected Risk Events in Drinking Water Systems

Author:

Bergion ViktorORCID,Lindhe AndreasORCID,Sokolova EkaterinaORCID,Rosén LarsORCID

Abstract

AbstractUnexpected risk events in drinking water systems, such as heavy rain or manure spill accidents, can cause waterborne outbreaks of gastrointestinal disease. Using a scenario-based approach, these unexpected risk events were included in a risk-based decision model aimed at evaluating risk reduction alternatives. The decision model combined quantitative microbial risk assessment and cost–benefit analysis and investigated four risk reduction alternatives. Two drinking water systems were compared using the same set of risk reduction alternatives to illustrate the effect of unexpected risk events. The first drinking water system had a high pathogen base load and a high pathogen log10 reduction in the treatment plant, whereas the second drinking water system had a low pathogen base load and a low pathogen Log10 reduction in the treatment plant. Four risk reduction alternatives were evaluated on their social profitability: (A1) installation of pumps and back-up power supply, to remove combined sewer overflows; (A2) installation of UV treatment in the drinking water treatment plant; (A3) connection of 25% of the OWTSs in the catchment area to the WWTP; and (A4) a combination of A1–A3. Including the unexpected risk events changed the probability of a positive net present value for the analysed alternatives in the decision model and the alternative that is likely to have the highest net present value. The magnitude of the effect of unexpected risk events is dependent on the local preconditions in the drinking water system. For the first drinking water system, the unexpected risk events increase risk to a lesser extent compared to the second drinking water system. The main conclusion was that it is important to include unexpected risk events in decision models for evaluating microbial risk reduction, especially in a drinking water system with a low base load and a low pathogen log10 reduction in the drinking water treatment plant.

Funder

Svenskt Vatten

Publisher

Springer Science and Business Media LLC

Subject

Health, Toxicology and Mutagenesis,Public Health, Environmental and Occupational Health,Pollution,Water Science and Technology

Reference45 articles.

1. Abbaspour K (2013) SWAT-CUP 2012: SWAT calibration and uncertainty programs-A user manual. Eawag Zurich, Dübendorf

2. Abrahamsson JL, Ansker J, Heinicke G (2009) MRA - A model for Swedish water works. Association SWaW, Stockholm, In Swedish: MRA - Ett modellverktyg för svenska vattenverk. https://vav.griffel.net/filer/2009-05_hogupplost.pdf

3. Ale B, Burnap P, Slater D (2015) On the origin of PCDS – (Probability consequence diagrams). Saf Sci 72:229–239. https://doi.org/10.1016/j.ssci.2014.09.003

4. Assmuth T, Simola A, Pitkänen T, Lyytimäki J, Huttula T (2016) Integrated frameworks for assessing and managing health risks in the context of managed aquifer recharge with river water. Integr Environ Assess Manag 12:160–173

5. Åström J, Lindhe A, Bergvall M, Rosén L, Lång L-O (2016) Microbial risk assessment of groundwater sources – development and implementation of a QMRA tool. Swedish Water and Wastewater Association, Stockholm, (In Swedish: Mikrobiologisk riskbedömning av grundvattentäkter – utveckling och tillämpning av ett QMRA-verktyg). https://vav.griffel.net/filer/SVU-rapport_2016-19.pdf

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