Hidasnemeti Szennyviztisztito Telep - Hernádszurdok, Hungary Wastewater Treatment Plant

Hidasnemeti Szennyviztisztito Telep is a wastewater treatment plant located in Hernádszurdok, a village in the Borsod-Abaúj-Zemplén county of northern Hungary. The plant serves a population of approximately 850 residents, classifying it as a small agglomeration under Hungarian and EU regulations. The plant provides secondary treatment, which is the standard biological treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into freshwater bodies. Its designed capacity is 2139 m³/day, and the actual discharge volume is 100.20 m³/day, indicating a low utilization rate relative to capacity. The treated effluent is discharged into local waterways that eventually drain into the Hernád River, a tributary of the Sajó River, which flows into the Tisza River and ultimately the Danube River and Black Sea. This connection highlights the plant's role in protecting downstream aquatic ecosystems in the Carpathian Basin.

The plant's discharge enters the Hernád River basin, which flows through northeastern Hungary and Slovakia before joining the Sajó River. The Sajó then merges with the Tisza, a major tributary of the Danube. This watershed supports diverse aquatic life and is important for regional biodiversity. The secondary treatment helps reduce organic pollutants and nutrients, mitigating eutrophication risks in downstream water bodies.