AIRE SUR LA LYS Wastewater Treatment Plant, Aire-sur-la-Lys, Hauts-de-France

The AIRE SUR LA LYS wastewater treatment plant is located in Aire-sur-la-Lys, a commune in the Pas-de-Calais department of Hauts-de-France, France. The facility serves a population of approximately 26,783, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). As a French treatment plant, it operates under the EU UWWTD (91/271/EEC), which requires secondary treatment for agglomerations of this size discharging into freshwater. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the local wastewater load. French plants typically employ biological treatment to meet regulatory standards. The treated effluent is discharged into the Lys River, which flows through the region and eventually joins the Scheldt River in Belgium before reaching the North Sea. The Lys River supports diverse aquatic life and is an important waterway for the region. The plant plays a key role in protecting the river's water quality and downstream ecosystems.

The plant discharges into the Lys River, a tributary of the Scheldt River, which flows through France and Belgium before emptying into the North Sea. The Lys River supports a variety of fish species and aquatic habitats, and its water quality is critical for both ecological health and human uses downstream. The plant's treatment helps reduce nutrient and pollutant loads, protecting the river's biodiversity and the Scheldt estuary.