Stockholm is growing, therefore the sanitation sewers will over the coming years undergo the biggest transformation of our time. As part of the project, Ramboll has been assigned the task to manage the process- and machine projection as well as project coordination of the site extension of the Henriksdal wastewater treatment plant. The contract is worth 24 million SEK and will run through 2015 and 2016.
In order to invest in the future’s sanitation sewers, handle the growing population and fulfil future environmental demands, Stockholm’s two existing wastewater treatment plants will become one.
A new tunneling sewer will be installed between Bromma and the Sickla plant, in combination with the phase-out of the wastewater treatment plant in Bromma. The purification process will be executed at the Henriksdal plant and the new receiving station that is to be built in Sickla. In Sickla, the wastewater will undergo a first purification process before it is pumped out to Henriksdal.
Rambolls VA process unit are the responsible process- and machine consultants for the new purification step in Sickla, which will have the capacity to clean water from approximately 1,2 million inhabitants of Stockholm.
In 2014, Ramboll conducted a preliminary study and a principal proposition for the new plant in Sickla. The tasks included process investigations, hydraulic modulations, preliminary projection, investment calculations, planning for the building permit and coordination of all technical areas involved.
Ramboll is also responsible for the detail projection of the tunnel between Bromma and the Sickla plant. This is a project where several units at Ramboll are involved: rock engineering, geotechnics, road and motorway engineering, bridges and tunnels, landscaping and BIM. Ramboll is also working with the foundation for the environmental impact assessment.
The tunnel from Bromma and the modification of the Henriksdal wastewater treatment plant is a strategic and important environmental investment, which contributes to Sweden’s commitment to the Baltic Sea action plan (BSAP) and the European Union’s water framework directive. The goal is to surpass the raised environmental standards for outlets of phosphorus and nitrogen in the Baltic Sea.