KA Auerbach Muhlweg Wastewater Treatment Plant, Auerbach, Saxony

KA Auerbach Muhlweg is a municipal wastewater treatment plant located in Auerbach, a town in the Erzgebirgskreis district of Saxony, Germany. The plant serves a population of around 2,700 residents and is designed to handle a daily capacity of 3,000 cubic meters. It operates under Germany's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which sets standards for wastewater collection and treatment. The plant provides secondary treatment, which typically involves biological processes to reduce organic matter and suspended solids. For a small agglomeration of this size, secondary treatment meets the EU directive's requirements for inland freshwater discharges. The plant's discharge volume is reported at 405 m³/day, indicating it operates well below its designed capacity. The treated effluent is discharged into local watercourses that drain into the Zwickauer Mulde river, a tributary of the Mulde, which flows into the Elbe and eventually the North Sea. The plant plays a key role in protecting the water quality of these rivers and the downstream ecosystem, including the Elbe's diverse aquatic habitats.

The plant discharges into small streams that feed into the Zwickauer Mulde river, part of the Elbe river basin. The Elbe flows through Germany and the Czech Republic before reaching the North Sea, supporting diverse aquatic life and serving as an important migratory corridor for fish. The region's forested and agricultural landscape means the plant helps control nutrient inputs that could otherwise contribute to eutrophication in downstream waters.