COV Bystre Wastewater Treatment Plant, Bystré, Slovakia

COV Bystre is an advanced wastewater treatment plant located in the town of Bystré, within the Prešovský kraj region of eastern Slovakia. The facility serves a population of approximately 4,812, classifying it as a small agglomeration under EU standards. It operates under the regulatory framework of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for discharges into inland waters. The plant provides advanced treatment, which goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus. This level of treatment is typical for sensitive areas where eutrophication is a concern. The designed capacity of 10,266 m³/day indicates the plant is sized to accommodate future growth or seasonal variations, with a current discharge volume of 984.79 m³/day. The treated effluent is discharged into local watercourses that ultimately drain into the Topľa River, a tributary of the Ondava River, which flows into the Bodrog River and then the Tisza River, eventually reaching the Black Sea. The plant plays a crucial role in protecting the water quality of these rivers and the downstream ecosystems, including the Tisza River basin, which supports diverse aquatic life and is an important migratory corridor for fish.

The plant discharges into the Topľa River basin, which flows into the Ondava River, a major tributary of the Bodrog River. The Bodrog joins the Tisza River in Hungary, which ultimately drains into the Black Sea. The Tisza River basin is ecologically significant, supporting diverse aquatic habitats and serving as a key migratory route for fish species. Advanced treatment at COV Bystre helps reduce nutrient loads that could otherwise contribute to eutrophication in downstream water bodies.