Grafenthal Wastewater Treatment Plant, Probstzella, Thüringen

Grafenthal is a closed wastewater treatment plant located in Probstzella, a municipality in the Thüringen region of Germany. The facility served a population of approximately 2,145 people and was designed to handle a capacity of 3,900 cubic meters per day, with an actual discharge volume of 542.85 cubic meters per day. The plant employed advanced treatment processes, which go beyond the secondary treatment requirements mandated by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal to protect sensitive water bodies, aligning with Germany's implementation of the directive in sensitive areas. The treated effluent was discharged into the local watershed, which ultimately drains into the Saale River, a tributary of the Elbe River that flows into the North Sea. The plant's location in the Schiefergebirge region, a low mountain range, means the receiving waters support diverse aquatic life and contribute to the ecological health of the Elbe basin.

The plant's discharge entered the local stream network, which feeds into the Loquitz River, a tributary of the Saale. The Saale flows northward to join the Elbe, which empties into the North Sea. This watershed supports a variety of fish species and riparian habitats. The region's slate mountains (Schiefergebirge) create a sensitive environment where nutrient pollution can impact downstream water quality, making advanced treatment important for ecological protection.