COV Zeliezovce Wastewater Treatment Plant, Želiezovce, Nitriansky kraj, Slovakia

COV Zeliezovce is a municipal wastewater treatment plant located in Želiezovce, a town in the Levice District of the Nitriansky kraj region in western Slovakia. The plant serves a population of approximately 1,594, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The facility is situated inland, away from coastal areas, and discharges treated effluent into the local watershed. The plant provides secondary treatment, which is the minimum standard required by the EU UWWTD for freshwater discharges from agglomerations of this size. With a designed capacity of 8,000 m³/day and an actual discharge volume of 326.22 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent from COV Zeliezovce is discharged into a local watercourse that ultimately drains into the Hron River, a major tributary of the Danube River. The Danube flows into the Black Sea, making this plant part of a large international river basin. The plant's operation helps protect the water quality of the Hron and Danube rivers, supporting aquatic ecosystems and downstream water uses.

COV Zeliezovce discharges treated wastewater into a local stream that flows into the Hron River, a significant tributary of the Danube River. The Danube is the second-longest river in Europe and drains into the Black Sea, supporting a vast array of aquatic life and providing water for millions of people. The Hron River basin is ecologically sensitive, hosting diverse fish populations and riparian habitats. The plant's secondary treatment helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream water bodies.