Wastewater Pipeline for the World’s Largest Land‑Based Aquaculture

About the Project

To ensure sufficient wastewater capacity for both the HIMA Seafood facility and a future municipal treatment plant, a new and extensive pipeline system is being constructed from Svadde to Lake Tinnsjøen.

The works include a new discharge pipeline (wastewater pipeline), three planned complete pumping stations, and an associated section of subsea pipeline. The pipeline runs from the factory area along the Måna River and further out into Lake Tinnsjøen, with a total length of approximately 12 kilometres. Along parts of the alignment, a new municipal water and wastewater network is also being established.

The entire project is being delivered within a 12‑month construction period, including both design and execution.

Scope of Work

Pumping Stations and Technical Installations

• One complete pumping station with superstructure, HVAC installations, pumps and pipe systems
• Advanced valve‑control solutions for the facility
• Installation of high‑voltage infrastructure along the entire route

Pipeline Works

• Complete onshore and subsea pipelines for gravity flow and pumped wastewater
• Connection to inlet and outlet interfaces at the pumping station
• Excavation in riverbeds and other challenging terrain
• Directional drilling for a Ø630 PE pipeline over a 600‑metre stretch

Construction Logistics and Temporary Works

• Establishment of temporary construction roads
• Temporary detour routes for public traffic, particularly between the municipal treatment plant and the bridge
• Construction of a temporary river crossing bridge
  
  

Stabilisation and Reconstruction

• Stabilisation of existing flood embankments
• Reconstruction of stone armouring along the Måna River and retaining walls where construction works affect existing structures
• Reconstruction of the existing hiking trail that was used as a construction road

Commissioning and Operation

• Commissioning of the entire system, training of operating personnel and trial operation

Cable Works

• Construction of cable trenches and installation of:
  • 3 high‑voltage cables
  • 2 fibre‑optic conduits
  • Grounding conductor along the full onshore pipeline route from Svadde to Lake Tinnsjøen

Ground Conditions

• Glacial moraine soils with a high groundwater level
• Areas exposed to landslide risk → required careful planning, robust water‑management solutions and continuous geotechnical assessment