Researchers involved in LANDFEED’s Use Case 3 are developing innovative solutions to transform olive mill residues into bio-based fertilisers. This work supports more circular agricultural systems in Mediterranean regions.
Led by the National Technical University of Athens in collaboration with IATRIDIS, the use case focuses on recovering valuable nutrients and materials from olive oil production residues. At the same time, it aims to reduce environmental pressures associated with olive waste management.
More specifically, as part of recent activities, project partners collected the first samples of two-phase olive pomace from the 2025–2026 olive oil production season. The material is currently undergoing physicochemical characterisation to assess its composition and suitability for bio-based fertiliser production.
At the same time, researchers are advancing the development of biodegradable chitosan-based coatings for controlled-release fertilisers. This work aims to improve nutrient efficiency and limit nutrient losses commonly associated with conventional fertilisers.
Current research activities include:
- Encapsulation of bio-based fertilisers derived from olive mill waste ash and microalgae
- Development of chitosan-based biodegradable coatings
- Testing crosslinking strategies to improve coating stability and mechanical strength
- Evaluating nutrient release profiles for potassium, magnesium and other minerals
Together, these developments support the creation of controlled-release fertilisers capable of delivering nutrients more efficiently while reducing environmental impact. By combining waste valorisation with innovative material-based solutions, LANDFEED continues to advance sustainable approaches to nutrient recovery and fertiliser production.
Use Case 3 demonstrates how olive mill residues can be converted into valuable secondary resources. In this way, the work contributes to both circular economy objectives and more sustainable farming practices across Europe.
