LAY SAINT CHRISTOPHE Wastewater Treatment Plant, Lay-Saint-Christophe, Grand Est

LAY SAINT CHRISTOPHE is a municipal wastewater treatment plant located in Lay-Saint-Christophe, a commune in the Meurthe-et-Moselle department of the Grand Est region, France. The plant serves a small population of around 1,450 residents, reflecting its role in a rural or suburban setting near Nancy. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the standard required by the EU directive for agglomerations with a population equivalent (PE) between 2,000 and 10,000, though this plant serves fewer than 2,000 people. Its designed capacity is 5,760 m³/day, indicating headroom for future growth or seasonal peaks. The actual discharge volume is 258.68 m³/day, suggesting a utilization rate well below capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Moselle River, a major tributary of the Rhine. The Rhine basin is a critical ecological corridor in Europe, supporting diverse aquatic life and migratory fish species. The plant's secondary treatment helps protect downstream water quality in this sensitive river system.

The plant discharges into the Moselle River basin, which flows into the Rhine River and eventually the North Sea. The Moselle is an ecologically important river supporting diverse fish populations, including salmonids and cyprinids. Secondary treatment reduces organic pollutants and suspended solids, helping to maintain water quality in this transboundary river system that serves as a habitat for aquatic life and a source for drinking water downstream.