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SFA Start / Refurbishment WWTP / Modern wastewater treatment / Refurbishment and expansion of the Sickla plant

Refurbishment and expansion of the Sickla plant

Refurbishment and expansion of the Sickla plant
The Sickla plant is part of the Henriksdal treatment plant and is mostly situated inside the rock beneath Hammarbybacken.

The existing plant will be extended. We will be blasting out around 530,000 cu m of solid rock in total – covering an area of around the same size as the Globe Arena – forthe plant that will accommodate primary treatment, grit chambers and chemical treatment with pre-sedimentation.

If you live close to the plant or have visited the area, you may have noticed an unpleasant odour in the vicinity. This odour is caused by the sludge treatment that currently takes place outdoors. Refurbishment of the Sickla plant and the Henriksdal treatment plant mean that sludge treatment is now being moved to Henriksdal, where treatment can take place inside the mountain. The natural perimeter protection means that the disruptive odour will not spread to the local area.

This work will continue until 2026 while the treatment plant continues to operate as usual.

Operations at present

Many people wonder what actually happens at the Sickla plant at present.

The Sickla plant is currently used for primary treatment of the wastewater passing through the plant. Primary treatment of the wastewater from two major in the tunnels known as the Farsta Tunnel and the Årsta Tunnel* in our business takes place here. All Söderort wastewater is brought here for treatment via these tunnels.

Pre-sedimentation of wastewater also takes place at Sickla. Pre-sedimentation involves filtering out urine and faeces from the wastewater.

We then send the water – which is still dirty – on in a tunnel to the Henriksdal treatment plant, where the wastewater undergoes the remaining treatment stages.

*The fact that the tunnels are named after urban districts does not mean that the Årsta Tunnel only carries wastewater from Årsta, for example – all Söderort wastewater and some of the inner city wastewater is carried in this tunnel as well.

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Construction work in Sickla

  • A new inlet tunnel from Bromma.
  • A new inlet pumping station for handling increased wastewater volumes.
  • New primary treatment, which includes screen grids (perforated sheet screens), grit chambers and treatment and sand washers (which removes coarse particles such as sand, cotton swabs, wet tissues and other things that should never be flushed down in the toilet)
  • New pre-sedimentation, where organic material and some phosphor are separated.
  • Installation of odour reduction equipment.
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When the project is completed

We will be connecting the Bromma Tunnel to the Sickla plant, making a total of three inlet tunnels to the plant: the new “Bromma Tunnel”, plus the existing “Farsta Tunnel” and “Årsta Tunnel”.

Primary treatment and pre-sedimentation of wastewater from the three tunnels will still take place at the Sickla plant.

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Sludge treatment to disappear

We currently extract sludge from wastewater at both Henriksdal and Sickla. The sludge from Henriksdal is sent in a tunnel to Sickla, where all the sludge is treated and loaded onto trucks in the open for removal from the site.

This gives off an unpleasant odour and is occasionally disruptive for people living nearby.

Sludge treatment in Sickla will be eliminated entirely. It will be relocated to Henriksdal instead, where treatment can take place inside the mountain. The natural perimeter protection means that the disruptive odour will not spread to the local area, and the loaded vehicles will be able to access major roads such as Södra länken more quickly.

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