FOSFORFRIA TVÄTTMEDEL - INVERKAN PÅ DET KOMMUNALA AVLOPPSVERKET Fullskaleförsök i Dagsberg, Norrköpings kommun / Washing-agents without Phosphorus - Effect on the Wastewater Treatment Plant A Full Scale Experiment in Dagsberg, Norrköping
Could future sharper demands for phosphorus removal at the wastewater treatment plants be met with a broad change-over to washing-agents without phosphorus? A full scale experiment has been conducted at the wastewater treatment plant Dagsberg in the community of Norrköping. At this plant phosphorus is removed through coagulation with ferric chloride. The water consumers in Dagsberg almost exclusively used phosphorus-free washing-agents for a period of 4-5 months. During this period the phosphorus quantities coming to the wastewater treatment plant diminished from 1,665 to 1,357 grams per day and in the purified water the phosphorus content changed from 0.84 to 0.54 ppm. The results were compared with data from a period of five years prior to the experiment.