Oberweser Gieselwerder Wastewater Treatment Plant, Lippoldsberg, Hessen

Oberweser Gieselwerder is a municipal wastewater treatment plant located in the village of Lippoldsberg, part of the Wesertal municipality in the Landkreis Kassel district of Hessen, Germany. The plant serves a population of approximately 2,098 and has a designed capacity of 5,000 cubic meters per day, with an average discharge volume of 886.8 m³/day. As a secondary treatment facility, the plant provides biological treatment to remove organic matter and suspended solids. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent (PE) between 2,000 and 10,000 are required to have appropriate treatment, typically secondary treatment, which this plant meets. The plant operates within Germany's national water management framework, which implements the EU directive through the Water Resources Act (WHG). The plant discharges treated effluent into the Weser River, which flows northward through Lower Saxony and into the North Sea near Bremerhaven. The Weser River is an important waterway and supports diverse aquatic life, including migratory fish species. The plant's location inland and its secondary treatment level help protect the river's water quality in this rural, agricultural region of Hessen.

The treated effluent from Oberweser Gieselwerder discharges into the Weser River, which flows approximately 450 km north through central Germany before entering the North Sea. The Weser basin supports a variety of fish species, including salmon and sea trout, and is an important migratory corridor. The plant's secondary treatment helps reduce nutrient loads, contributing to the ecological health of the river and downstream estuary.