ALKALINITETSHÖJNING SOM KORROSIONSSKYDD I DRICKSVATTENLEDNINGAR. Metodik och resultat från uppföljningsarbetet i Göteborg / Increase of Alkalinity for Corrosion Prevension in Drinking Water Pipes Methods and Results from the Following-up Programin the Town of Göteborg
In order to reduce the red water problem in Göteborg, water quality was changed with respect to alkalinity and hardness. The raw water is very soft. By adding lime and carbon dioxide in the end of the water treatment process alkalinity is increased from 18 to 60 mg hydrogen carbonate/1. At the same time the calcium content is changed from 15 to approximately 30 mg/I. The process change is followed-up with a wide program of investigations presented in the paper. Water sample analysis and registration of consumers complaints both show a considerable improvement in water quality with respect to iron content. Stagnant water at the consumers tap show a slight increase in copper content.