Viikinmäki Wastewater Treatment Plant

The Viikinmäki Wastewater Treatment Plant, built mainly inside the rock, was commissioned in 1994 and is the largest wastewater treatment plant in Finland and the Nordic countries.

The Viikinmäki Wastewater Treatment Plant process is based on the activated sludge method, in which the organic matter from the sludge is digested, producing energy.

Rockplan has been involved in both the original design of the Viikinmäki Wastewater Treatment Plant as well as in its later expansion phase. In the expansion, space was excavated for a new biological post-filter and a new treatment line, keeping the treatment plant is in operation throughout the excavation. The expansion increased the plant’s nitrogen removal capacity to the level of 70%, as required by the authorities.

Helsingin vesi (now Helsinki Region Environmental Services Authority HSY)

Rock mechanics and tunneling design

Related References

Stockholm Metro – Blue Line Extension to Nacka

Sweco Civil AB

Stockholm metro’s blue line is being extended from Kungsträdgården, with new terminals at Nacka and Sockeplan. The track length of the extension is 11 kilometers, along which 5 new metro stations will be built.

South-Hermanni Underground Parking Facility

Helsingin kaupungin asuntotuotantotoimisto ATT

The South-Hermanni parking facility serves residential and commercial properties in the area. There are 336 parking spaces, as well as five stairwells and four elevators to the surface level.

Vuosaari Transportation Tunnels

Tiehallinto/ Vuoli-projekti

Rockplan designed Vuosaari Harbor’s Porvarinlahti road tunnels and Labbacka railway tunnel in cooperation with Finnmap Infra Oy. The 1,600-meter-long submarine road tunnel in Vuosaari is approximately 25 meters below sea level at its deepest point.


For more information please contact Miika Kalliokari
+358 40 557 5113