The case study addresses high level experts and water supply managers. The objective was to determine the needed pathogen reductions during riverbank filtration (RBF) and final disinfection so that safe drinking water production can be guaranteed for the future. An approach integrating QMRA with hydrological process modelling that is driven by microbial source tracking (MST) and virus data is presented with the recently developed computational tool QMRAcatch (free download at: www.waterandhealth.at).
The case study site is located at the Danube River in Austria and a river/floodplain area with important drinking water resources, serving also as important recreational area for the City of Vienna (300 thousand visitors per year). The study site can be regarded as a model area to study RBF systems in particular when conflicting land/resource utilisations do exist.
Several municipalities located upstream of the study site discharge biologically treated wastewater into the Danube River that include sporadic combined sewer overflows. The urban drinking water is produced from a well series after treatment by the RBF system and additional disinfection. Besides the impact from the Danube River, visitors and wildlife faecal pollution have potential impact on the microbiological water quality in the floodplain area.
The outcomes consist of the assessed faecal pollution burden and the needed virus reduction level by treatment of river source water to reach safe drinking water.
This paper was supported by project 23900-B22 granted to AHF and FWF (Vienna Doctoral Program on Water Resource Systems W1219-N22 ) and the GWRS project (Vienna Water) as part of the “(New) Danube-Lower Lobau Network Project” funded by the Government of Austria and Vienna, and the European Agricultural Fund for Rural Development (LE 07-13). This is a joint study effort of the ICC Water & Health (www.waterandhealth.at).