GREZ DOICEAU Wastewater Treatment Plant, Grez-Doiceau, Belgium

The GREZ DOICEAU wastewater treatment plant is located in Grez-Doiceau, within the Brabant wallon province of Belgium. It serves a population of approximately 4,739 people, classifying it as a small to medium agglomeration under Belgian and EU regulations. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. It has a designed capacity of 20,000 m³/day and currently discharges an average volume of 847.09 m³/day, indicating significant spare capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Scheldt River basin and the North Sea. The plant plays a key role in protecting the region's water quality and supporting the ecological health of downstream aquatic environments.

The plant discharges into local streams that flow into the Dyle River, a tributary of the Scheldt, which empties into the North Sea. This watershed supports diverse aquatic life and is important for migratory fish species. The region's sensitive water bodies require effective nutrient removal to prevent eutrophication in downstream estuaries.