Hasselroth _ Niedermittlau Wastewater Treatment Plant, Niedermittlau, Hessen, Germany

The Hasselroth _ Niedermittlau wastewater treatment plant is located in Niedermittlau, a district of Hasselroth in the Main-Kinzig-Kreis district of Hessen, Germany. The facility serves a population of approximately 32,500, classifying it as a medium agglomeration under EU regulations. As a German plant serving over 10,000 population equivalent, it is required to meet secondary treatment standards under the EU Urban Waste Water Treatment Directive (91/271/EEC). The directive mandates that such agglomerations provide at least secondary biological treatment, with more stringent requirements if discharging into sensitive areas. It operates within Germany's robust regulatory framework for wastewater management. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Main River basin. The Main River flows westward to join the Rhine River near Mainz, eventually reaching the North Sea. This catchment area supports diverse aquatic ecosystems and is an important water resource for the region.

The plant discharges into the Main River basin, a major tributary of the Rhine River. The Rhine is one of Europe's most important waterways, supporting diverse aquatic life and serving as a critical migratory corridor for fish species. The downstream environment includes ecologically sensitive areas that benefit from effective nutrient removal to prevent eutrophication. The plant's location in Hessen places it within a region where water quality management is prioritized to protect both local streams and the broader Rhine ecosystem.