ANNOEULLIN SE Wastewater Treatment Plant, Don, Hauts-de-France

ANNOEULLIN SE is a municipal wastewater treatment plant located at Rue de la Centrale in Don, near Lille, within the Hauts-de-France region of northern France. The plant serves a population of approximately 13,883 people, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). Under the EU UWWTD, agglomerations of this scale are required to provide secondary treatment (biological treatment) as a minimum standard. The directive also mandates more stringent treatment if the receiving waters are designated as sensitive areas, such as those prone to eutrophication. It operates within the French regulatory framework, which implements the UWWTD through national legislation. The plant discharges treated wastewater into the local watershed, which ultimately drains into the North Sea via the Deûle River and the Scheldt basin. The region's water bodies support diverse aquatic life and are important for both ecological balance and human use, including agriculture and recreation. Proper treatment helps protect downstream water quality and the sensitive coastal environment of the North Sea.

The plant's treated effluent enters the local water system, which flows into the Deûle River, a tributary of the Scheldt River. The Scheldt basin drains into the North Sea via the Western Scheldt estuary in Belgium and the Netherlands. This watershed supports diverse aquatic ecosystems, including fish populations and migratory birds. The North Sea is a productive marine environment, and nutrient inputs from wastewater can contribute to eutrophication, making effective treatment crucial for maintaining water quality and ecological health.