Bank of Actions

Bank of Actions

Are you seeking examples or inspiration for water protection? There are plenty of potential actions to choose from! The Bank of Actions will provide your organisation with concrete ideas and examples of water protection activities implemented by organisations in the Baltic Sea Challenge network. You can browse these according to the theme, type of actor, country, year or keyword.

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Biogas from beach cast algal masses

Actor: Trelleborg municipality   ●   Year: 2011   ●   Address: Smygehamn, Trelleborg, Sweden

In Trelleborg the consequenses of eutrophication are visible when marinas and beaches are covered with philamentous red algae. To create a resource from this biomass, it is collected and used to produce biogas in a two step-biogas facility close to Sweden's southermost point, Smygehamn in Trelleborg. © Trelleborg


Algae biogas plant has been running since May 2014 (pilot plant since 2011) and it treats 500-1000 m3 algae/year. It was financed by EU Life (Bucefalos), HaV and NIB. The algae collected in Trelleborg contains about 0,4 kg P and 7 kg N/ t wet weight. If 10 000 tons of algae is collected, this contains 60 t of N and 3,4 t of P. The biogas is equivalent of this is 110 000 liters of diesel.


The beach cast algae contain nitrogen and phosphorus. When the algae is collected, nutrients are extracted from the sea. The algae is used to produce fossil free energy and the residual is returned to arable land as a nutrient source. The coastline is very important for recreation in Trelleborg, and clean beaches and a clean sea is essential for prosperity in the region. © Trelleborg

Background information

Further information

Name: Matilda Gradin   ●  Email: matilda.gradin (a)   ●  Web page: