COV Opocno Wastewater Treatment Plant, Mokré, Královéhradecký kraj

COV Opocno is a municipal wastewater treatment plant located in Mokré, a village in the Královéhradecký kraj region of the Czech Republic. The plant serves a population equivalent of 10,080, classifying it as a medium-sized agglomeration under Czech and EU regulations. It is situated inland, away from coastal areas, and discharges treated effluent into local watercourses. 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 in non-sensitive areas. The designed capacity is 8,200 m³/day, and the current discharge volume is 783.76 m³/day, indicating operational capacity well within design limits. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated wastewater is discharged into the local watershed, which ultimately drains into the Elbe River basin and then into the North Sea. The plant plays a key role in protecting the water quality of the region's rivers and groundwater, supporting aquatic ecosystems and downstream water uses.

The plant discharges into the local river network, which is part of the Elbe River basin. The Elbe flows through the Czech Republic and Germany before reaching the North Sea. The watershed supports diverse aquatic life, including fish species such as brown trout and grayling, and provides habitat for riparian birds and mammals. The plant's secondary treatment helps reduce organic pollution and nutrient loads, contributing to the ecological health of the downstream environment.