NOM diagnostics for the assessments of source water treatability and treatment performance at water supply systems in Norway / NOM-analyser för att bedöma ytvattens behandlingsbarhet och beredningsegenskaper från vattenverk i Norge
This paper presents data on water quality and NOM characteristics from analyses of raw and treated water samples from some 30 water supply systems in Norway. Three different water treatment technologies were applied: (1) Enhanced Coagulation (EC); (2) Ozonation-Biofiltration (OBF); or (3) Nano-filtration (NF). The water samples were analysed using simple NOM characterisation methods and user-relevant parameters like TOC, DOC, colour, UV-absorbance, SUVA, hydrophobic and hydrophilic NOM fractions and BDOC. The data, collected over a 10-year period (2004–2014), provide valuable information on NOM characteristics and treatability by various methods. In addition, the data provide information on the interactions between treatment and distribution, i.e. treatment-specific effects on biostability (BDOC) and metal residuals that may contribute to the formation of biofilms and deposits that may adsorb NOM and microorganisms. Correlations between selected NOM-related quality parameters are presented, and the results show significant treatment technology-specific differences in NOM removal characteristics. The data also form a reference basis for future assessments of possible climatechange driven changes in NOM concentrations, NOM composition and NOM characteristics.