Pilot 2: Barösund, Finland

The pilot site Bärosund marina is located in the Bärosund strait in Ingå, between the islands of Barölandet and Orslandet on the coast of southern Finland. During the high season, the amount of wastewater handled by the Barösund marina’s water supply exceeds the capacity of the local small-scale treatment plant. For this reason, solutions have been sought both in terms of saving water and increasing the cleaning capacity.

Main focus:

Renovation of the Barösund wastewater treatment plant in the municipality of Ingå.

Location:

Barösund, Ingå (Inkoo), Finland

Site

Skola Guest Harbour

Solution installed:

BioKube Jupiter biological-chemical wastewater treatment system.

Treatment capacity:

170 PE

Utilisation:

Wastewater treatment for the guest harbour.

Responsible:

Municipality of Ingå

About the pilot:

Skola Guest Harbour in Barösund, Ingå, is a popular summer destination in the Finnish archipelago. Wastewater volumes can be up to 12 times higher in summer than in winter, with 100–200 tourists visiting the area daily. During peak periods, excess wastewater was collected in a holding tank and transported 35 km to the central wastewater treatment plant in Ingå.

Wastewater analyses showed that the existing WehoPuts 30 treatment plant did not meet the required minimum removal efficiencies during the peak season. Based on the measured organic load, the required treatment capacity was calculated at 116 PE for the average July flow and 170 PE at maximum flow. The work therefore focused on the environmental permitting process and identifying a treatment solution suitable for large seasonal variations.

According to the environmental permit requirements, the wastewater treatment system must meet strict annual average effluent quality and treatment efficiency criteria (BOD7ATU: 15 mg/l, 95%; CODCr: 125mg/l, 90%; total phosphorus: 0.5 mg/l, 95%; suspended solids: 15 mg/l,90%), while achieving the highest possible level of ammonium nitrogen oxidation. Following a public procurement process, Vestelli Oy Finland submitted the only tender and proposed a BioKube Jupiter treatment system, which was installed at the site in September 2025.

• Read the good practices report about the Finnish pilot here.
• Find the pilot sheet here (PDF).
• Read more about the project from the report “Technical preparation for wastewater treatment investments at BSR tourist destinations”.

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