To preserve the infiltration zone (impluvium) existing around different water catchments in the Evian territory, the "Terragr'Eau Méthanisation" project has enabled the construction of a methanizer and the creation of a farmers’ cooperative to reconcile sustainable agriculture and preservation of water resources. Organic waste is degraded in digesters, stirred and heated to 38°C by anaerobic bacteria (micro-organisms that grow in the absence of oxygen). The degradation of organic waste can produce renewable energy, biogas, and a natural digestate that will serve as fertilizer for the soil. “Terragr’Eau” was founded jointly by the Danone Ecosystem Fund, the Société des Eaux Minérales d'Evian, the Pays d’Evian conurbation (a group of local communities), and 41 farms in the region.
Why it matters
This project aims to protect water basins, which supply various water catchments, including those that supply tap water to the Evian territory, and which are extremely fragile environments. This protection is particularly useful considering the impacts of modern livestock manure. The project also aims to preserve the economic and touristic assets of the territory.
How it works
The project’s methanization unit converts farm effluent and local green waste into a digestate that farmers can use to fertilize soil, and produce biogas which is injected into the local power grid. A farm cooperative is working with the local agricultural council to pool material and human resources and achieve balanced, controlled fertilization.
How it creates value
Terragr’eau protects mineral water springs and helps maintaining a thriving farm economy, preserving the Evian region’s environmental and economic assets as well as its appeal for tourism. It also consolidates the image of excellence embodied in its AOP and IGP quality logos, and has created a new green energy sector.
Participating farmers also benefit from customized agronomic input that helps them become more profitable and stay ahead of new regulations.
Photo credit: Ixalp Drones/ Philippe Cap