Grillon Wastewater Treatment Plant, Grillon, France

The Grillon wastewater treatment plant is located in the commune of Grillon, within the Vaucluse department of the Provence-Alpes-Côte d'Azur region in southeastern France. The facility serves a population of approximately 3,300 residents and operates as part of the municipal wastewater infrastructure for the area. As a secondary treatment plant, Grillon meets the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary biological treatment for populations between 2,000 and 10,000, which Grillon fulfills. The plant has a designed capacity of 2,300 cubic meters per day and currently treats an average daily flow of about 589 cubic meters. The treated wastewater from Grillon is discharged into local streams that eventually flow into the Rhône River basin. The Rhône is one of Europe's major rivers, draining into the Mediterranean Sea. The plant's operations help protect downstream water quality and aquatic ecosystems in the region.

Grillon lies inland in the Rhône River watershed, approximately 50 km from the Mediterranean coast. Treated effluent from the plant enters small tributaries that feed the Rhône, which flows into the Mediterranean Sea. The downstream environment supports diverse aquatic life and is an important migratory corridor for fish species. The plant's secondary treatment reduces organic pollutants and nutrients, helping to maintain water quality in the river system.