InternationalFachagentur Nachwachsende Rohstoffe e. V.



Cluster On Anaerobic digestion, environmental Services and NuTrients removAL

The aim of the Interreg South Baltic funded project COASTAL Biogas is to provide solutions, based on anaerobic digestion of cast seaweed, to coastal regions to tackle eutrophication, contributing to the transition to a circular bio-economy and improve prosperity.

The project focuses on the removal of nutrients from the South Baltic Sea by collecting cast seaweed to counteract eutrophication. The cast seaweed will be used as a co-substrate for anaerobic digestion (biogas production). Furthermore, the digestate can replace artificial fertilisers, and hence contributes to closing nutrient (N and P) cycles.

COASTAL Biogas will support and enhance cross-border technology guidance and transfer of cast seaweed co-digestion. A decision support tool and training kit will be developed and tailor-made for relevant stakeholders, e.g. biogas plant operators, municipalities, local authorities as well as cleaning companies, farmers and waste management companies, improving procedures of co-digestion of seaweed and digestate utilisation in the South Baltic area.

Best practises of existing biogas plants will be summarised examining the whole handling chain from marine substrate collection, storage and pre-treatment to mixing ratios with other feedstock and digestate utilisation.

The developed information kit, which is available in six languages on the project website, gives an overview on the project’s scope and informs about the whole process chain – beginning with the reasons for and effects of eutrophication and finishing with the utilisation of digestate as organic fertiliser on farmland. In addition, educational material, which also includes a quiz, can be used to address the topic in school classes.

The FNR is lead partner and responsible for the overall project coordination.

Project partners:
Fachagentur Nachwachsende Rohstoffe e.V. (FNR | DE), Gdansk University of Technology (GUT | PL), Baltic Energy Innovation Centre (BEIC | SE), Roskilde University (RUC | DK), University of Rostock (UROS | DE) and Lithuanian Energy Institute (LEI | LT)

Duration: 01.07.2018 - 31.12.2021

More information can be gained on the project website


FNR contact person: Thies Fellenberg



The project is funded by the Interreg South Baltic Programme, co-funded by the European Union fund ERDF.

The project is funded by the Interreg South Baltic Programme, co-funded by the European Union fund ERDF.