Merkendorf Wastewater Treatment Plant, Merkendorf, Bavaria

The Merkendorf wastewater treatment plant is located in the town of Merkendorf, in the Landkreis Ansbach district of Bavaria, Germany. It served a population of 1,856 people and was designed with a capacity of 4,000 cubic meters per day. The plant is currently closed. The plant provided advanced treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive for agglomerations of this size. Advanced treatment typically removes nutrients such as nitrogen and phosphorus, protecting sensitive water bodies from eutrophication. The treated effluent from the plant would have discharged into local watercourses that ultimately drain into the Rhine River basin and then to the North Sea. The plant's advanced treatment helped safeguard the local aquatic environment and downstream ecosystems.

The plant is located inland in the Franconian region of Bavaria, far from the coast. Its treated effluent would have entered local streams and rivers that flow into the Main River, a major tributary of the Rhine. The Rhine basin supports diverse aquatic life and is an important migratory corridor for fish. Advanced treatment at this plant helped reduce nutrient loading, protecting downstream water quality.