La Crèche Atlansevre Wastewater Treatment Plant, Ruffigny, Nouvelle-Aquitaine

La Crèche Atlansevre is an advanced wastewater treatment plant located in Ruffigny, a locality within the commune of La Crèche in the Deux-Sèvres department of Nouvelle-Aquitaine, France. The plant serves a population of approximately 1,340 people and has a designed capacity of 3,000 cubic meters per day, with a current discharge volume of 239.05 cubic meters per day. As an advanced treatment facility, La Crèche Atlansevre goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants in sensitive catchment areas under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 2,000 population equivalent), the directive requires appropriate treatment, and the advanced level indicates compliance with local environmental objectives. The plant discharges treated effluent into the local watershed, which ultimately drains into the Sèvre Niortaise river and then into the Bay of Biscay (Atlantic Ocean). The surrounding region is characterized by agricultural land and small watercourses, making nutrient removal important for protecting downstream water quality and aquatic ecosystems.

The treated effluent from La Crèche Atlansevere enters the local drainage network, which flows into the Sèvre Niortaise river. This river meanders through the Marais Poitevin, a vast wetland area of ecological importance, before reaching the Bay of Biscay. The advanced treatment helps reduce nutrient loading, protecting the sensitive wetland habitats and supporting diverse aquatic life, including migratory fish species.