Sewage Tunnels at the Blominmäki Wastewater Treatment Plant

The sewage tunnels of the Blominmäki Wastewater Treatment Plant consist of an inlet tunnel leading to the treatment plant and a discharge tunnel leading out of the treatment plant. A total of about 20 kilometers of inlet and discharge tunnels and associated access tunnels will be excavated.

In addition to the tunnels, the contract includes maintenance and emergency exit shafts that are critical for safety, the Suomenoja Acceleration and Drainage Pumping Station built within the rock as well as its associated above-ground shaft access buildings, and a challenging connection to the existing offshore tunnel. The offshore tunnel directs treated wastewater 15 kilometers to the sea.

Rockplan was also involved in the general design phase when a suitable site was sought for a new wastewater treatment plant in Espoo. There were five alternative locations under review.

The contracts are estimated to be completed in the summer of 2021. In 2022, the new Blominmäki Wastewater Treatment Plant will treat wastewater from 400,000 inhabitants in the Espoo, Kirkkonummi, Siuntio and West Vantaa areas.

Client
Helsinki Region Environmental Services Authority HSY

Responsibilities
Principal design, architectural, rock mechanics and tunneling, and structural design as well as environmental monitoring programs

Related References

West Metro

Länsimetro Oy

With the West Metro extension, the Helsinki metro network will reach Espoo, increase in length by 21 kilometers and see 13 new stations constructed along its run.

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.

Viikinmäki Wastewater Treatment Plant

Helsingin vesi (now Helsinki Region Environmental Services Authority HSY)

The Viikinmäki rock treatment plant, which was built mainly inside the rock, was put into operation in 1994. The treatment plant’s process is based on the activated sludge method.

Interested?

For more information please contact Miika Kalliokari:
+358 40 557 5113
miika.kalliokari@rockplan.fi.