CRESPIN SE Wastewater Treatment Plant, Crespin, Hauts-de-France

CRESPIN SE is an advanced wastewater treatment plant located in Crespin, a commune in the Nord department of Hauts-de-France, France. The plant serves a population of 3,526 and has a designed capacity of 20,000 m³/day, indicating it is sized for future growth or seasonal peaks. It operates under France's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment levels based on the sensitivity of receiving waters. As an advanced treatment facility, CRESPIN SE goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants discharging into sensitive areas. The plant's discharge volume is 629.03 m³/day, well below its designed capacity, suggesting efficient operation or lower current loads. The regulatory framework ensures compliance with stringent effluent standards to protect water quality. The plant's treated effluent is discharged into the local water system, which ultimately drains into the Scheldt River basin. The Scheldt flows through France and Belgium before reaching the North Sea. This river system supports diverse aquatic life and is an important ecological corridor. The advanced treatment helps minimize nutrient pollution, reducing the risk of eutrophication in downstream waters.

CRESPIN SE discharges into the Scheldt River basin, which flows through northern France and Belgium to the North Sea. The Scheldt estuary is a vital habitat for migratory birds and supports a range of fish species. Advanced treatment at this plant helps control nutrient loads, protecting the river's ecological health and reducing the impact on the downstream marine environment.