Bourogne ZI Wastewater Treatment Plant, Allenjoie, Bourgogne-Franche-Comté

Bourogne ZI is a wastewater treatment plant located in Allenjoie, within the Doubs department of Bourgogne-Franche-Comté, France. It serves a population of approximately 3,000 people, classifying it as a small agglomeration under French regulations. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 5,000 m³/day and an average discharge of 534.30 m³/day, the plant operates well below its capacity, indicating room for future growth. As a French facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on the sensitivity of receiving waters. The treated effluent is discharged into local waterways that ultimately drain into the Doubs River, a tributary of the Saône, which flows into the Rhône and then the Mediterranean Sea. The plant plays a key role in protecting the water quality of the Doubs River basin, supporting aquatic life and downstream ecosystems.

The plant discharges into the Doubs River basin, which flows through the Jura region and joins the Saône River near Verdun-sur-le-Doubs. The Saône then meets the Rhône at Lyon, eventually reaching the Mediterranean Sea. The Doubs River supports diverse aquatic life, including fish species such as grayling and brown trout, and its water quality is critical for both ecological health and human uses downstream.