GUIGNICOURT Wastewater Treatment Plant, Villeneuve-sur-Aisne, Hauts-de-France

The GUIGNICOURT wastewater treatment plant is located in Villeneuve-sur-Aisne (formerly Guignicourt), in the Hauts-de-France region of northern France. It serves a population of approximately 5,241 people, classifying it as a small to medium agglomeration under French and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 6,200 m³/day and an average discharge volume of 934.98 m³/day, the facility operates well within its capacity, ensuring effective treatment of municipal wastewater. Treated effluent is discharged into the local watershed, which ultimately drains into the Aisne River, a tributary of the Oise River, and then into the Seine River before reaching the English Channel. The plant plays a key role in protecting the water quality of this river system, which supports diverse aquatic life and is used for recreation and agriculture downstream.

The plant discharges into the Aisne River basin, which flows into the Oise River and then the Seine River, ultimately reaching the English Channel. This watershed supports a variety of fish species and is an important ecological corridor. The advanced treatment helps reduce nutrient loads, protecting downstream water bodies from eutrophication and maintaining biodiversity.