Chièvres Wastewater Treatment Plant, Tongre-Saint-Martin, Hainaut, Belgium

The Chièvres wastewater treatment plant is located in Tongre-Saint-Martin, a subdivision of Chièvres in the Hainaut province of Wallonia, Belgium. This small-scale facility serves a population equivalent of 339, reflecting its role in a rural community within the Ath administrative region. As a secondary treatment plant, Chièvres meets the minimum treatment standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent above 2,000, but smaller plants like Chièvres are subject to national regulations that typically align with these standards. The plant's designed capacity of 5000 m³/day indicates it can handle peak flows, while current discharge volume is 60.60 m³/day. The treated effluent from Chièvres is discharged into local watercourses that ultimately drain into the Scheldt River basin, which flows through Belgium and the Netherlands into the North Sea. The plant plays a key role in protecting the region's surface water quality, particularly in the sensitive agricultural landscape of Hainaut, where nutrient management is critical for downstream aquatic ecosystems.

The Chièvres plant discharges into the local drainage network of the Hainaut region, which feeds into the Scheldt River basin. The Scheldt flows through Belgium and the Netherlands before reaching the North Sea, a sensitive marine environment. The surrounding area is predominantly agricultural, making nutrient removal important to prevent eutrophication in downstream water bodies. The plant's secondary treatment helps reduce organic load and protect the ecological health of the river system.