Ramböll: An approach to circular farming by reducing nutrients to the Baltic Sea

 A large part of pollution driving eutrophication in the Baltic Sea is due to an excess of nutrients that ends up in the sea because of land run-off. Circular farming is a promising option to reduce the amount of nutrients that end up in the sea.

The Baltic Sea City Accelerator partner Ramböll is working with the city of Ljusdal in Sweden on innovative ways to create circular farming, where horticulture and fish farming are optimised to avoid any nutrient loss.

The project proposal includes indoor tomato farming and on-land fish farming. Open water fish farming has very negative impact on the environment, including biodiversity loss, spreading of diseases and sea pollution. This is why Ramböll’s project includes an aquaponic facility with coordinated production of fish and tomatoes; the waste generated by the fish is used as fertilizer for the tomatoes, which in turn get their food by-products from both vegetable and fish farming. Nothing gets lost, and nutrients are used in an optimal way to grow food that can be sold locally.

Not only could this project generate around 1000 tons of fish and 8000 tons of tomatoes a year, but it could also create significant opportunities for the municipality, in terms of employment amongst other things. It could also cut emissions of CO2 linked to food transport, since fish and vegetables would be available locally.

This kind of innovative projects could be scaled up and represents real opportunities for the Baltic Sea Region. The Baltic Sea City Accelerator is to create value in a cleaner Baltic Sea environment, and to inspire many municipalities to take action to avoid excess of nutrient ending up in the sea.

Follow the project here.

PARTNER TEAM: Mattias von Brömssen