Stockholm Water and Waste

In the eastern part of the Stockholm Green Innovation District, Stockholm Water and Waste is making the city’s largest environmental investment.

There it is developing and rebuilding the Henriksdal wastewater treatment plant to meet Stockholm’s current and future needs. It will be one of the world’s most modern treatment plants, with doubled capacity and significantly improved water purification. The Sickla facility under Hammarbybacken (which is part of the Henriksdal wastewater treatment plant) is being expanded and a new sewage tunnel is being drawn from Bromma to the Sickla facility. When it is ready, the Bromma wastewater treatment plant will be closed.

The Henriksdal wastewater treatment plant is being upgraded and optimised with new purification technology and membrane technology. The wastewater treatment plant is being equipped with new biological treatment systems and will be one of the world’s largest facilities with membrane filtration.

With membrane technology (MBR), larger amounts of wastewater can be treated, and the quality of the purification is also better than before. The environmental benefits of the project are that emissions of nitrogen and phosphorus are reduced and that microplastics are purified before the water is released into the Baltic Sea. Stockholm Water and Waste is investing just over SEK 9 billion in the project. In doing so, it is safeguarding the ability of a growing Stockholm to treat its wastewater for many years to come.