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The BONUS RETURN decision-support toolbox offers 16 tools to help decision-makers transition to a circular economy by adopting eco-technologies for nutrient and carbon recovery. It covers the entire innovation lifecycle, from identifying criteria through social innovation and multi-criteria analysis to promoting existing technologies via sustainable and circular public procurement. The guide also details methods for supporting pre-commercial innovation, such as innovation competitions, market surveys, independent comparative analyses, and testbed trials. It concludes by framing these tools within a Technological Innovation Systems (TIS) approach to create long-term strategic incentives and co-benefits for the Baltic Sea Region.

The BONUS RETURN project has released three baseline SWAT (Soil and Water Assessment Tool) model applications for the Vantaanjoki (Finland), Fyrisån (Sweden), and Słupia (Poland) river basins. These models, which have undergone calibration and validation, are hosted in the Finnish Environment Institute (SYKE) open data repository to allow researchers and practitioners to utilize existing parameterizations or develop new scenarios for these and similar target areas.

The document details the development of SELECT ECOTECH, a serious game system (SGS) designed as a learning platform for stakeholders in the Baltic Sea Region (BSR). The game aims to foster systemic awareness and adaptive capacity when selecting eco-technologies to reduce nutrient and carbon emissions while maximizing co-benefits. Co-designed with stakeholders from three case study catchments—Fyrisån (Sweden), Vantaanjoki (Finland), and Slupia (Poland)—the game uses a board game format to simulate 'wicked' situations, including system shocks and policy changes. The report outlines a three-phase participatory design process, the game's rules regarding baseline emissions and resource management, and the specific eco-technologies and developments integrated into the system. The findings suggest that the iterative, playful nature of the SGS allows stakeholders to cross knowledge boundaries and experiment with innovative technology constellations beyond technocratic solutions.

The report evaluates the economic viability of various eco-technologies in the Fyrisån (Sweden), Słupia (Poland), and Vantaanjoki (Finland) river basins using a combined Cost-Benefit Analysis (CBA) and Multi-Criteria Analysis (MCA) approach. It finds that most technologies currently yield a negative net present value (NPV) due to high investment costs, with the notable exceptions of anaerobic digestion and thermal treatment in the Vantaanjoki basin.

The report evaluates different systems for nutrient and carbon recovery in the Vantaanjoki (Finland), Fyrisån (Sweden), and Słupia (Poland) catchment areas. Using a multi-criteria analysis (MCA) involving stakeholder weighting, the study compares baseline management against alternatives such as anaerobic digestion, pyrolysis, and source-separation. In Vantaanjoki, anaerobic digestion scored highest. In Fyrisån, source-separation was the most sustainable. In Słupia, nutrient extraction performed best, while source-separation was found to be potentially less sustainable than the baseline due to local context and low adoption rates.

The report examines the transition from linear to circular resource use in wastewater management, focusing on the socio-cultural barriers to recycling sewage sludge as fertilizer. It analyzes historical practices in the EU and provides detailed case studies from three river basins in Sweden, Poland, and Finland, highlighting how perceptions of risk and regulatory gaps hinder the adoption of eco-technologies.