Knullwald _ Niederbeisheim Wastewater Treatment Plant, Hessen, Germany

Knullwald _ Niederbeisheim is a municipal wastewater treatment plant located in Niederbeisheim, a district of Knüllwald in the Schwalm-Eder-Kreis district of Hessen, Germany. The plant serves a population of approximately 4,358 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). As a German facility, the plant operates under the national implementation of the EU UWWTD (91/271/EEC), which requires secondary treatment for agglomerations of this size discharging into freshwater. The plant's treatment process and capacity are consistent with typical small-scale municipal plants in rural Hessen, often employing biological treatment stages to meet effluent standards. The treated effluent is discharged into local watercourses that drain into the Schwalm River, a tributary of the Eder, which flows into the Fulda and ultimately the Weser River system. The plant plays a key role in protecting the water quality of these rivers and the downstream aquatic ecosystems.

The plant discharges into local streams that feed the Schwalm River, part of the Weser basin. The Schwalm-Eder region is characterized by agricultural land use and sensitive freshwater habitats. The plant's treatment helps maintain water quality for downstream communities and supports biodiversity in the riverine environment, including fish populations and macroinvertebrate communities.