UWWTP Melissant - Closed Advanced Wastewater Treatment Plant in Melissant, Netherlands

UWWTP Melissant was an advanced wastewater treatment plant located in Melissant, a village on the island of Goeree-Overflakkee in the province of Zuid-Holland, Netherlands. The plant had a designed capacity of 2160 cubic meters per day, indicating it served a relatively small population. It is now closed and no longer operational. As an advanced treatment facility, UWWTP Melissant would have provided tertiary treatment beyond secondary standards, including nutrient removal to protect sensitive receiving waters. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants in sensitive areas are required to meet stringent effluent standards, and the Netherlands applies these requirements rigorously, especially in coastal and estuarine zones. The plant's location near the North Sea coast means its treated effluent would have discharged into local waterways that drain into the North Sea. The Wadden Sea and Delta region are ecologically important areas, and advanced treatment helps minimize nutrient loading and protect marine biodiversity.

The plant is situated on Goeree-Overflakkee, an island in the Rhine-Meuse-Scheldt delta, a complex network of rivers and estuaries that drain into the North Sea. This delta region supports diverse aquatic habitats and is a critical stopover for migratory birds. Advanced treatment at this plant would have reduced nutrient and pollutant loads to the sensitive coastal environment, helping to maintain water quality in the North Sea and adjacent Natura 2000 sites.