Weimar Wastewater Treatment Plant: Serving Thüringen, Germany

The Weimar wastewater treatment plant is located in the city of Weimar, Thüringen, Germany, serving a population of about 78,191. As a medium-sized agglomeration, the plant is part of the municipal wastewater infrastructure managed by local authorities. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving populations over 10,000 are required to provide secondary treatment. For agglomerations like Weimar, which exceed 15,000 population equivalent, the directive mandates compliance with strict effluent standards to protect receiving waters. The plant discharges treated wastewater into the Ilm River, a tributary of the Saale, which flows into the Elbe and ultimately the North Sea. This river system supports diverse aquatic life and is an important ecological corridor in central Germany.

The treated effluent from the Weimar plant enters the Ilm River, which flows through the Saale and Elbe river systems before reaching the North Sea. This watershed supports a variety of fish and invertebrate species and is part of a larger network of rivers that provide critical habitat and migration routes. The plant's compliance with EU standards helps maintain water quality in this ecologically sensitive region.