COV Dolna Zdana Wastewater Treatment Plant, Hliník nad Hronom, Slovakia

COV Dolna Zdana is a former wastewater treatment plant located in Hliník nad Hronom, within the Banskobystrický kraj of central Slovakia. The plant provided secondary treatment for the local community before its closure. As a closed facility, it no longer processes wastewater, and its role in the regional infrastructure has been superseded by other facilities. During its operational period, the plant would have been subject to Slovak national regulations aligned with the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of a certain size. The plant's secondary treatment level indicates it met the standard for biological treatment of organic matter. The area drains into the Hron River basin, which flows into the Danube River and ultimately the Black Sea. The closure of this plant may have implications for local water quality, though alternative treatment arrangements are assumed to be in place.

The plant is located inland in the Hron River basin, which feeds into the Danube River and the Black Sea. The region supports diverse aquatic life and is part of a broader ecological network. The closure of the plant reduces local discharge but requires that wastewater is managed elsewhere to prevent untreated releases.