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The WalNUT project has developed a method to produce fertiliser from algae cultivated on dairy effluents, potentially reducing mineral fertiliser use by 25%. Farmers in western France conducted field trials that revealed combining algae powder with mineral fertilisers can achieve equivalent yields while decreasing mineral fertiliser dependency.

The project aims to treat various wastewaters and recover nutrients for bio-based fertilisers, enhancing sustainability in agriculture. A nutrient recovery facility in Ourense, Spain, further exemplifies these circular economy efforts, with plans to optimize solutions for reducing environmental impacts and food system resilience.