ROEULX SUD Wastewater Treatment Plant, Thieu, Hainaut, Belgium

ROEULX SUD is a wastewater treatment plant located in Thieu, within the municipality of Le Rœulx in the Hainaut province of Wallonia, Belgium. The plant provides secondary treatment to wastewater from the local area, supporting the region's sanitation infrastructure. With a designed capacity of 3,500 m³/day, the plant operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this scale. This regulatory framework ensures that the plant meets required effluent standards to protect water quality. The treated effluent from ROEULX SUD is discharged into local watercourses that ultimately drain into the Scheldt River basin, contributing to the broader North Sea catchment. The plant plays a key role in safeguarding the ecological health of these waters, supporting aquatic life and downstream communities.

The plant discharges into local streams that flow into the Haine River, a tributary of the Scheldt, which empties into the North Sea via the Western Scheldt estuary. This watershed supports diverse aquatic habitats and is important for migratory fish species. The secondary treatment provided helps reduce organic pollution and nutrient loads, mitigating eutrophication risks in downstream waters.