Sweden has undertaken to reduce its emissions of phosphorus and nitrogen to the Baltic Sea, as these contribute to eutrophication. These measures are regulated in the Baltic Sea Action Plan and the EU’s Water Framework Directive. We also need to protect the water in Lake Mälaren, which is our drinking water source and a popular lake for swimming.
The project Stockholm's future wastewater treatment (SFA)
Henriksdal's wastewater treatment plant and the Sickla facility are being developed into one of the world's most modern plants, where we use new technology to purify more wastewater in the same area. The Bromma treatment plant, which is now which is now used to its limits and does not meet future environmental requirements, will be closed. The wastewater from Bromma will instead be led in a new sewage tunnel to be treated with the new technology in Henriksdal.
Environmental benefits with SFA
With efficient membrane technology in Henriksdal's wastewater treatment plant, we reduce emissions of nitrogen and phosphorus and can separate, for example, microplastics before the water is discharged into the Baltic Sea. With the new technology, we can live up to the increased environmental requirements of the future.
With the new sewer tunnel, many discharge points along Lake Mälaren will be removed, which means that the emissions of untreated wastewater into the lake in the event of heavy rains will be reduced by 50%.
Another advantage of the project is that no malodorous sludge management will take place in the vicinity of residential areas in Åkeshov and Hammarby sjöstad.