KALHAUSEN Wastewater Treatment Plant, Weidesheim, Grand Est, France

KALHAUSEN is a wastewater treatment plant located in Weidesheim, within the commune of Kalhausen in the Moselle department of Grand Est, France. The plant serves a population of 2,750 and is situated in a rural area near the German border. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 5,000 m³/day and an average discharge volume of 490.60 m³/day, the plant operates well below its capacity, indicating room for future growth. The treated effluent is discharged into local watercourses that ultimately drain into the Saar River basin, a tributary of the Moselle and Rhine rivers. This region supports diverse aquatic life and is part of the larger Rhine-Maas watershed, which flows into the North Sea.

The plant's discharge enters the local stream network, which flows into the Saar River, a major tributary of the Moselle. The Moselle joins the Rhine at Koblenz, and the Rhine discharges into the North Sea. The watershed supports diverse aquatic ecosystems, including fish species such as salmon and trout, and is an important migratory corridor for European eels.