Holzheim Wastewater Treatment Plant, Weisingen, Bavaria

The Holzheim wastewater treatment plant is located in Weisingen, a district of Holzheim in Bavaria, Germany. It serves a population of approximately 2,970 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant operates with advanced treatment, which is typical for sensitive areas or where stringent effluent standards apply. With a designed capacity of 3,600 m³/day and an average discharge volume of 740.56 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. As a German facility, it adheres to the national implementation of the EU UWWTD, which mandates secondary treatment as a minimum and tertiary or advanced treatment in sensitive catchments. The treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin. The Danube flows eastward through several countries before reaching the Black Sea. The plant's advanced treatment helps protect downstream aquatic ecosystems, including the Danube's diverse fish populations and riparian habitats.

The plant discharges into the Danube River basin, which flows through Germany, Austria, and several other countries before reaching the Black Sea. The Danube supports a rich diversity of fish species, including sturgeon and salmonids, and its floodplains provide critical habitat for migratory birds. Advanced treatment at this plant reduces nutrient loading, helping to prevent eutrophication in downstream waters.