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Nature-based solutions: Restoring Bällstaån
Restoring Bällstaån. Exploring nature-based solutions for eutrophication remediation. By Mathilda Lindström and Emma Hermansson
In an era of growing urbanization, maintaining clean and sustainable water environments is crucial for ecosystem health and human well-being. Bällstaån, a stream in Järfälla municipality, faces ecological and chemical challenges due to eutrophication, toxins, andphysical factors, hindering the attainment of sustainable development goals. Nature-based solutions (NbS) have gained recognition as an effective approach to addressing eutrophication and as a means to achieving the SDGs. The aim of this project is therefore toexplore possible NbS for eutrophication remediation in Bällstaån. The exploration involves identifying what type of NbS can contribute to mitigating eutrophication effects and examining the factors influencing their implementation and suitability for Bällstaån through literature reviews, site analysis, and interviews. The results show that various NbS can effectively address eutrophication in Bällstaån. Explored solutions include constructed wetlands, buffer strips, phytoremediation, and biomanipulation. Constructed wetlands and buffer strips emerge as more tested options, with phytoremediation and biomanipulation requiring further investigation. Due to limited space in and around Bällstaån, buffer strips are deemed preferable. The study also concludes that there are several implementation factorsthat are important to consider for successfully implementing NbS. These include considering site-specific complexities, ensuring stakeholder participation and collaboration, prioritizing and planning for maintenance and evaluation, as well as reviewing costs, multi-functionality, and alternative solutions.
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