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Oygarden STP – Norway’s Latest STP Buried in a Mountain

Norway’s west coast comprises of more than 300 islands that lie within the municipality of Fjell. With the nearby city of Bergen now more accessible via new transport infrastructure, the Fjell region has been experiencing rapid population growth.

To comply with recently changed environmental regulations a new wastewater treatment plant was required and given the landscape in this part of the world, the construction of the new Oygarden STP required a design that utilised as little space as possible.

Built within a mountain called Storanipa, the new treatment plant processes up to 43 MLD of wastewater. HUBER supplied the bulk of the process equipment for this first stage of the project. The second stage will see the construction of a new secondary treatment facility.

“The first stage of the new Oygarden STP comprises of primary treatment. HUBER LIQUID Drum technology was selected as this equipment uses only 10% of the area of a circular clarifier. Even against inclined lamella technology the Liquid Drums was selected due to its low height. The treatment plant was built within a mountain, so accommodating taller equipment would have been costly.

To save on construction time and reduce civil works, pre-packaged above ground inlet works systems were used. All the primary sludge is dewatered in HUBER Rotary Screw Presses.

The project showcases how we can help reduce the capital cost of primary treatment facilities and fit them into dense built up areas – this project could be applied to any new or upgraded treatment system in Australia, New Zealand or the Pacific” says John Koumoukelis, CEO of Hydroflux Epco.

HUBER Liquid Drums is a horizontal drum screen fitted with a fine mesh – purposely designed to act as a primary clarifier and to remove suspended solids downstream of an inlet works. The performance is similar to or better than primary clarifiers or sedimentation tanks but only requires 10% of the real estate.

The discharge criteria for Oygarden STP were as follows:

Stage 1 Discharge Limits

  • BOD5 < 40 mg/L or 20% reduction
  • TSS < 60 mg/L or 50% reduction

The future stage 2 process shall have tighter discharge limits for TSS, BOD and Nutrients.

About the Hydroflux Group
The Hydroflux Group comprises eleven companies based in Australia, New Zealand, Fiji and the UK, providing design and build, equipment, processes and operational services in water and wastewater treatment.
Hydroflux Epco NZ Ltd is a member of the Hydroflux Group.

Contact
Hydroflux Epco NZ Ltd
Level 26, HSBC Tower, 188 Quay St
Auckland 1010 New Zealand
P +64 9 352 2052
[email protected]

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