Aldersbach Wastewater Treatment Plant, Walchsing, Bavaria

The Aldersbach wastewater treatment plant is located in Walchsing, a district of Aldersbach in Bavaria, Germany. It serves a population equivalent of 7,241, classifying it as a small agglomeration under EU regulations. The plant is situated in the rural landscape of the Passau district, near the Aldersbach stream. As a German facility, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Germany implements this directive through national legislation, with oversight by the Bavarian environmental authorities. The plant's treatment process and capacity are designed to meet these regulatory standards, ensuring effective removal of organic matter and nutrients. The treated effluent is discharged into local watercourses that flow into the Danube River basin. The Danube ultimately drains into the Black Sea, making this plant part of a transboundary watershed. The receiving waters support diverse aquatic life and are important for regional ecology, including fish habitats and riparian ecosystems.

The Aldersbach plant discharges into small streams that feed into the Danube River system, which flows through multiple countries before reaching the Black Sea. This watershed supports a variety of fish species, including Danube salmon and other migratory fish, and provides critical habitat for aquatic birds and amphibians. The plant's location in a rural area means its discharge can affect local water quality, particularly in smaller streams with limited dilution capacity.