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Himmerfjärdsverket, Grödinge

Tougher treatment requirements necessitate extensive renovation and extension of the Himmerfjärdsverket treatment plant in Grödinge. The project, which is currently in the production phase, is being carried out by Veidekke in close collaboration with the customer Syvab, as a combination of execution and turnkey contracts.

Work in progress at Himmerfjärsdverket

Customer

Syvab

Timeline

2019 - 2026

Place

Grödinge

Scope

Treatment plant with 350,000 people connected.

Project type

Infrastructure - Treatment plant

Contract

Execution contract and turnkey contract in collaboration

Value

SEK 1.4 billion

Major renovation and extension

Himmerfjärdsverket currently receives wastewater from 350,000 people in seven municipalities in the Stockholm region and is operated by Syvab.

In order to cope with the increasing burden of a growing population and tougher treatment requirements, the treatment plant must be renovated and expanded.

The project in numbers

120 000 m3

Volume of water

The plant currently receives approximately 120,000 m3 of water to be treated daily

350 000

People connected

-50%

Discharges

The renovation will lead to halving of discharges

Halved discharges

The name of the giant project is NKH - Nya Krav Himmerfjärdsverket. When the new plant is completed, discharges should be halved while serving even more households.

Tougher treatment requirements necessitate extensive renovation and extension of the Himmerfjärdsverket treatment plant in Grödinge.

Complex project in collaboration

It is a complex project involving numerous specialists. Since the same amount of wastewater is constantly coming in from the connected households, the entire job must be carried out while the plant is operating. This places great demands on cooperation.

We are working in close collaboration with Veidekke, which suits our way of working. Veidekke contributes where Syvab lacks expertise, for example production planning. They have been good at understanding what we need. I feel that we have control over what is going on and understand the consequences of different decisions. This is one of the benefits of working closely with the contractor.
Petter Björkman, Project Manager, Syvab

Renovations and extensions

In the first phase, system documents and calculation work for the new plant were completed. Veidekke was also responsible for specific technical consultation.

The second phase, with the production of the renovations and extensions, is currently in full swing with the casting of the concrete in the basin floor and walls.

The plan is for Nya Himmerfjärdsverket to be ready for commissioning in stages from the first quarter of 2024.

Both turnkey and execution contract

Veidekke’s responsibilities in the production phase include:
Extension, which is implemented as turnkey contract

  • New strainer station
  • Pump station
  • Membrane building
  • Associated technical facilities

Renovation of existing plant as execution contract

  • Existing basins
  • Outlet pipe

When the new plant is completed, discharges should be halved while serving even more households.

Innovative design

To meet the tougher treatment requirements, innovation has to be applied to both design and process. For example, a so-called MBR will be used, where MBR stands for Membrane BioReactor.

Himmerfjärdsverket will be a globally unique pioneering plant. This is a model project both in terms of how we arrived here – how the project has been designed – and the final result.
Petter Björkman, Project Manager, Syvab

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