Project description

Eutrophication has both ecological and social consequences and is one of the major environmental problems in the Baltic Sea at the same time there is a need for a transition from a fossil-based to a sustainable bio-based society.

Algae blooming
©Riku Lumiaro/SYKE
A dead zone
©Baltic Eye






Mitigate eutrophication of the Baltic Sea

By digesting cast seaweed and use the digestate to replace fossil based artificial fertilizers nutrients are physically removed from the Baltic Sea and hence the nutrients loop is closed which is fundamental for the circular bioeconomy. In addition the inconveniences with rotten seaweed (smell, flies etc) are eliminated and low quality resources/wastes are transferred into a renewable high quality fuel that can be used for local electricity and heat supply, as transport fuel or for injection into the natural gas grid.

Cast seaweed is co-digested in industrial scale in Solrød, Denmark. © Solrød Biogas

COASTAL Biogas is composed of 5 work packages, of which WP1 deals with Management and Coordination and WP2 deals with Communication and Dissemination

WP3 Potential, benefits and good practice deals with the potential of cast seaweed and provides methods to assess the associated potential eco system benefits in the South Baltic Sea region. Here, ongoing or recently finished biogas projects and facilities related to anaerobic digestion (AD) of maritime substrates and digestate utilization as well as policy framework will be reviewed.

WP4 Exploration & Implementation deals with increasing the environmental service contribution from biogas production in the South Baltic Sea area by improving the utilization of seaweed in biogas processes and the residual fermented biomass (digestate) as fertilizer. It has the following sub-objectives:
– Exploration and first step implementation of new collection techniques related to biogas production in the South Baltic Sea area.
– Primary energy recovery through laboratory, pilot and feed in industrial scale testing of new pre-treatment technologies to utilize seaweed in anaerobic digestion.
– Secondary energy recovery from contaminated digestate by thermochemical conversion.

WP5 Feasibility studies, supporting opportunities and multiplying project results deals with the development and testing of tools and assessment methods to assist in planning and decision making. The analysis results will uncover strengths, weaknesses, problems and possible solutions of the objective technology. Planning instruments will be designed to accelerate and facilitate decision making by gathering all data upon which decision can be made in one place and providing models and simulations to evaluate investment potential, predict the success of the investment and determine the development strategy. The knowledge and assessment tools will be spread to interested professionals as well as perform lectures on biogas/seaweed solutions and provide detailed information to stakeholders on the market, technical, economic and social determinants in implementation and exploitation of nutrient removal technology.

Project start
1 July 2018

Project duration
36 months

Project budget
1.6 MEUR