COV Velke Ulany Wastewater Treatment Plant, Veľké Úľany, Slovakia

COV Velke Ulany is a municipal wastewater treatment plant located in Veľké Úľany, a village in the Trnavský kraj region of western Slovakia. The plant serves a population of approximately 2,589 residents, classifying it as a small agglomeration under EU standards. It is situated in the Danubian Lowland, an area characterized by agricultural activity and proximity to the Danube River basin. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size discharging into freshwater. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant has a designed capacity of 5,200 m³/day, with a reported discharge volume of 529.85 m³/day, indicating it operates well below its capacity. Treated effluent from the plant is discharged into local waterways that ultimately drain into the Danube River, a major European waterway flowing into the Black Sea. The plant plays a key role in protecting the local aquatic environment and downstream ecosystems, including the Danube Delta, by reducing nutrient and pollutant loads from the village's wastewater.

The plant discharges into small streams that feed into the Danube River basin, which flows through Slovakia and several other countries before reaching the Black Sea. The Danube supports diverse aquatic life and is an important migratory corridor for fish. The plant's secondary treatment helps reduce organic pollution and nutrient loads, protecting downstream water quality and the ecological health of the Danube Delta.