ZELLWILLER Wastewater Treatment Plant, Zellwiller, Grand Est, France

The ZELLWILLER wastewater treatment plant is located in Zellwiller, a commune in the Bas-Rhin department of the Grand Est region, France. The facility serves a population equivalent of 63,000, classifying it as a medium to large agglomeration under EU regulations. The plant is situated inland, approximately 50 km from the coast. As a French wastewater treatment plant serving over 10,000 people, ZELLWILLER is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC). This directive requires secondary treatment for all discharges from agglomerations of this size, with tertiary treatment in sensitive areas. The regulatory framework ensures appropriate treatment standards are met. The treated effluent from ZELLWILLER is discharged into local water bodies that ultimately drain into the Rhine River basin. The Rhine is a major European waterway flowing through Germany and the Netherlands into the North Sea. The plant plays a crucial role in protecting the water quality of the Rhine catchment, which supports diverse aquatic life and provides drinking water for millions of people downstream.

ZELLWILLER is located in the Rhine River basin, with its treated effluent eventually reaching the Rhine and then the North Sea. The Rhine is a heavily utilized waterway that supports a variety of fish species, including salmon and eel, and is an important migratory corridor. The plant's discharge contributes to the overall nutrient load in the basin, making effective treatment essential for maintaining water quality and preventing eutrophication in downstream waters.