Messelbroek Wastewater Treatment Plant, Scherpenheuvel-Zichem, Belgium

Messelbroek is an advanced wastewater treatment plant located in Messelbroek, a sub-municipality of Scherpenheuvel-Zichem in the province of Vlaams-Brabant, Belgium. The plant serves a population of approximately 4,800 residents, making it a small to medium agglomeration under EU classification. It treats wastewater from the local community and discharges 858 cubic meters per day of treated effluent. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant's designed capacity is 9,000 cubic meters per day, indicating room for future growth or seasonal peaks. The treated effluent is discharged into local watercourses that drain into the Demer River, a tributary of the Dijle, which flows into the Rupel and eventually the Scheldt estuary in the North Sea. The plant plays a key role in protecting the water quality of the Demer basin, which supports diverse aquatic life and is used for recreation and agriculture downstream.

The plant discharges into the Demer River basin, which flows through the Flemish region into the Dijle, Rupel, and Scheldt rivers before reaching the North Sea. This watershed supports a mix of agricultural, urban, and natural areas, including ecologically sensitive wetlands and floodplains that provide habitat for fish and migratory birds. Advanced treatment at Messelbroek helps reduce nutrient loads that could otherwise contribute to eutrophication in the Scheldt estuary.