GRANDGLISE Wastewater Treatment Plant, Grandglise, Hainaut, Belgium

GRANDGLISE is a municipal wastewater treatment plant located in Grandglise, a village in the municipality of Belœil, within the province of Hainaut, Belgium. The plant serves a small population of around 1,480 residents and has a designed capacity of 2,500 cubic meters per day, with an average discharge volume of 264.55 m³/day. As a secondary treatment facility, GRANDGLISE provides biological treatment to remove organic matter and suspended solids. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent (PE) between 2,000 and 10,000 are generally required to have secondary treatment. While the plant's population served is below 2,000, it is part of Belgium's national implementation of the directive, which often extends requirements to smaller communities to protect water quality. The treated effluent from GRANDGLISE is discharged into local watercourses that eventually flow into the Scheldt River basin. The Scheldt drains into the North Sea via the Western Scheldt estuary in the Netherlands. The plant plays a role in maintaining the ecological health of these waters by reducing nutrient and organic pollution loads.

The plant discharges into the Scheldt River basin, which flows through Belgium and the Netherlands before reaching the North Sea. The Scheldt estuary is an ecologically sensitive area that supports diverse aquatic life, including migratory fish species. Nutrient and organic pollution from wastewater can contribute to eutrophication and oxygen depletion in downstream waters, making the plant's secondary treatment important for protecting the basin's water quality.