Drebach Wastewater Treatment Plant, Grießbach, Saxony, Germany

The Drebach wastewater treatment plant is located in Grießbach, a district of Drebach in the Erzgebirgskreis district of Saxony, Germany. It serves a population of approximately 2,187 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant provides secondary treatment, which is the minimum required for freshwater discharges under the directive. As a German facility, the plant operates under the national implementation of the EU UWWTD, which mandates secondary biological treatment for all agglomerations above 2,000 population equivalent (PE). The plant's designed capacity of 3,600 m³/day indicates it can handle peak flows, while the current discharge volume of 328.05 m³/day suggests it operates well below capacity. The treatment process likely involves mechanical and biological stages to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse that drains into the Zschopau River, a tributary of the Freiberger Mulde, which flows into the Mulde River and eventually into the Elbe River and the North Sea. The plant plays a key role in protecting the water quality of the Zschopau River and downstream ecosystems, including the Elbe estuary.

The Drebach plant discharges into a small stream that feeds the Zschopau River, part of the Elbe River basin. The Zschopau flows through the Erzgebirge (Ore Mountains) region, supporting diverse aquatic life and providing drinking water for downstream communities. The Elbe River ultimately reaches the North Sea, making the plant's treatment important for both local and international water quality. The region is ecologically sensitive due to its forested watershed and historical mining impacts.