Sweco took part in the construction planning of Lohja’s compound pipelines.
Lohja compound pipelines
City of Lohja
In total, 45 kilometres of water and sewage pipelines were built. In connection to this project, the Karjalohja, Sammatti and Nummi-Pusula wastewater treatment plants were shut down and the wastewater treatment was centralised into the Pitkäniemi wastewater treatment plant in Lohja. Centralising the wastewater treatment improves the treatment results and reduces the emission burden of water bodies.
In order to secure water distribution, water pipelines were also built in the excavations intended for the sewage pipelines.
In this project, Sweco was in charge of designing the pipelines and pump stations as well as the project’s geotechnics, field measurements and geotechnical investigations.