For decades, volcanic ash was seen as a threat to crops, homes, and roads. In addition to obstructing irrigation systems, it involved high costs and extensive cleaning days.
However, in the towns located at the foot of Mount Etna, the daily fall of volcanic material is a recurring phenomenon. With each eruption of the tallest and most active volcano in Europe, an average of 12,000 tons of ash per day is recorded.
In recent episodes, such as in July 2024, the situation intensified in Catania, the second largest city in Sicily. There, 17,000 tons per day were reached, and the cleaning tasks extended for almost ten weeks.
Applied science to transform impact into opportunity
Faced with this unusual and almost constant accumulation, the University of Catania promoted an interdisciplinary project over five years to rethink ash management.
Based on scientific studies, the team identified its potential as a productive resource. Thus, the material ceased to be considered solely as waste and became a strategic input.
Among the most relevant findings was the possibility of using it as a natural fertilizer. In this way, it opens the door to reducing the use of chemical products and promoting more sustainable agricultural practices.
The environmental benefits of volcanic ash
Etna’s ash is rich in iron, aluminum, and silica. Therefore, its incorporation into the soil improves drainage and provides nutrients that favor plant growth.
Consequently, its use can decrease the dependency on synthetic fertilizers. This not only reduces costs but also mitigates the soil and water pollution associated with industrial inputs.
Furthermore, this approach promotes a circular economy model. Instead of sending the material to landfills, it is reintegrated into the productive system, reducing waste and emissions related to transport and final disposal.
Local experiences and diversification of uses
In Giarre, agricultural producers began applying ash in tropical fruit and citrus plantations. Additionally, in Linguaglossa, winemakers choose to leave it on the ground to improve fertility.
Simultaneously, applications were proposed in road construction, the manufacture of insulating materials, water purification, and the production of ink for 3D printers. Even artisanal initiatives emerged that transform the ash into artistic objects.
However, regulatory challenges persist. The European regulations classify urban ash under the EWC 20 03 03 code as non-recyclable municipal waste, which requires its disposal in landfills at a cost of 300 euros per ton.
Although regional guidelines were published in 2024 to facilitate its reuse, there is still no formal registry of authorized companies to process it. Meanwhile, the goal is to consolidate social acceptance and move towards a sustainable model that turns ash into an ally of the environment.
