Økning i løst naturlig organisk materiale i Tsjekkiske drikkevannskilder (DWARF)
Increasing levels of Dissolved Organic Matter (DOM) is a large challenge for Drinking Water Treatment Plants. Surface water is the source of more than 50% of drinking water in the Czech Republic. In the region of South Bohemia surface water supports drinking water for more than 350 thousand people from the reservoirs (Římov, Husinec, Jordán) and Otava River. Catchments of these sources will be characterized with respect to the sources of DOM and their temporal and spatial variability resulting in a map of DOM sources with future predictions. A methodology for outflow control in reservoirs to minimize the effect of flood events with high DOM levels will be developed. A cooperation among basin authorities, drinking water producers, and Czech and Norway research partners will be established.
Concentrations of dissolved organic matter (DOM) is increasing in surface waters and the water is becoming more coloured (browning). This poses large challenges for drinking water treatment plants (DWTP) using surface water as raw water sources. This project is building on insights gained from a previous Nordic project (NOMiNOR) (Eikebrokk et al. 2014) on browning of waters and its impact on water treatment. The project applies those insights to a case study in the Czech Republic and at the same time contextualizes and enhances our knowledge on the topic.
Thus, the two main objectives of the DWARF project are to:
1) Strengthen the conceptual understanding of the link between governing factors on the amount and characteristics of DOM in raw water sources for drinking water plants, and
2) Increase levels of knowledge and competence on DOM treatability, optimum DOM removal in water treatment, and DOM control during water treatment and distribution.
To achieve these objectives, we need to unravel the concurrent governing factors for temporal and spatial differences between the amount and physicochemical characteristics of the raw water. This will be achieved through multivariate statistical analysis comparing climate and catchment information with data of water chemistry and DOM characteristics from monitoring and comprehensive characterization of raw and treated water samples. Main catchment characteristics are vegetation, land use, geology, and soil type/morphology. Raw water samples from surface waters used for preparation of drinking water will be collected during winter, spring, summer, and autumn periods, as well as during episodes of different flow regimes.