Beersel Wastewater Treatment Plant, Ruisbroek, Vlaams-Brabant, Belgium

The Beersel wastewater treatment plant is located in Ruisbroek, a sub-municipality of Beersel in the province of Vlaams-Brabant, Belgium. The facility serves a population of approximately 49,600, classifying it as a medium-sized agglomeration under European Union regulations. As a Belgian plant, Beersel operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations between 10,000 and 150,000 population equivalent. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas. The plant's treated effluent is discharged into local waterways that ultimately drain into the Scheldt River basin, flowing through Flanders toward the North Sea. The region's dense population and industrial activity make effective wastewater treatment critical for protecting downstream aquatic ecosystems and coastal water quality.

The Beersel plant discharges into the Zenne River, a tributary of the Dijle, which flows into the Rupel and then the Scheldt River. The Scheldt estuary is an ecologically important area supporting diverse aquatic life and migratory bird populations. The plant's location in the Scheldt basin means its effluent quality directly affects the health of this transboundary river system and the North Sea coastal environment.