ECAUSSINNES Wastewater Treatment Plant, Écaussinnes-d'Enghien, Hainaut, Belgium

The ECAUSSINNES wastewater treatment plant is located in Écaussinnes-d'Enghien, a municipality in the Hainaut province of Wallonia, Belgium. The plant serves a population of approximately 1,992 and has a designed capacity of 7,500 m³ per day, with an average discharge volume of 356.07 m³ per day, indicating ample capacity for current loads. The plant operates at the secondary treatment level, which is the standard required by the European Union's Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring compliance with EU effluent standards before discharge. The treated effluent is discharged into local watercourses that ultimately drain into the Scheldt River basin, which flows through Belgium and the Netherlands into the North Sea. The plant plays a key role in protecting the region's water quality, supporting aquatic life and downstream ecosystems in the Scheldt estuary.

The plant discharges into the local water network that feeds into the Senne River, a tributary of the Dijle, which joins the Rupel and then the Scheldt River. The Scheldt estuary is a critical habitat for migratory birds and supports diverse aquatic life, including fish species such as eel and flounder. The region's water quality is managed under the EU Water Framework Directive, aiming to achieve good ecological status.