Increasing wastewater treatment capacity

In order to meet Stockholm's population growth, Stockholm Vatten is making a major investment to increase its wastewater treatment capacity.


The city of Stockholm is growing rapidly. To meet this population growth, Stockholm Vatten has identified a need to expand and renovate the wastewater treatment plant to increase its capacity. This will be achieved by concentrating the capacity to Henriksdal's wastewater treatment plant, which will be rebuilt into one of the world’s most modern treatment plants. A new tunnel from Bromma to Henriksdal will be constructed and the treatment plant in Bromma will be taken off-line and closed. The total investment is around 6 billion kronor, and will largely be funded by the attractive plots of land which will be made available through the closure of the Bromma treatment plant.


The renewal of the Henriksdal treatment plant and construction of the new tunnel will begin in 2016 and will last for approximately three years. The tunnel will be just over 15 km long and will be 30-90 m below ground level.


The investments made by Stockholm Vatten in Sickla and Henriksdal will include a new pretreatment facility in Sickla, with a new pump station, new coarse screening and primary sedimentation basins. The Henriksdal plant will benefit from new machinery and new technologies, including membrane distillation.


This project will have many positive effects on the environment, both due to the reduction of heavy transport to Henriksdal and Sickla, and due to the world class purification technology in the Henriksdal plant.


ÅF won two contracts in the procurement process in 2014: tender lot 2 Electricity and Telecommunications and lot 3 Automation systems. Systems engineering will be ongoing during the autumn and Stockholm Vatten has the option of hiring ÅF for additional detailed design and consulting services during the construction period.


ÅF's mission includes providing a solution for powering the entire plant including the back-up power supply, as well as managing and monitoring the plant using modern and safe technology.

If you have any questions about this project, contact Juha Mattila.


About Us

ÅF is an engineering and design company within the fields of energy, industry and infrastructure. We create sustainable solutions for the next generation through talented people and technology. We are based in Europe and our business and clients are found all over the world. ÅF – Making Future.