FJERNING AV HUMUS / Removal of Humic Substances
Due to aesthetical, organoleptic, health related as well as economical and practical reasons, humic substances constitutes a quality problem in drinking water. About 50 % of the Norwegian waterworks exceed the quality standards related to colour. A great effort has been made to find alternatives to the traditional way of humic substance removal, coagulation followed by floc separation in two steps (sedimentation or flotation and filtration). Treatment methods like direct filtration, ion exchange, membrane filtration, ozonation and activated carbon adsorption have been experimentally evaluated to find treatment costs and capabilities. This presentation is an extract of the final report from these research activities.