Bayerbach b Ergoldsbach Wastewater Treatment Plant, Penk, Bavaria

Bayerbach b Ergoldsbach is a former wastewater treatment plant located in Penk, a locality within the municipality of Bayerbach bei Ergoldsbach in Bavaria, Germany. The plant served a population of approximately 1,532 people and was designed to handle a capacity of 2,600 cubic meters per day. It is now listed as closed. The plant provided secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's discharge volume was recorded at 387.71 cubic meters per day, indicating a utilization rate well below its designed capacity. The treated effluent from the plant would have been discharged into a local watercourse, likely a tributary of the Isar River or the Danube River system. The region is part of the Danube basin, which ultimately drains into the Black Sea. The plant's closure may reflect consolidation of wastewater services in the area, with flows redirected to a larger regional facility.

The plant's discharge would have entered a small watercourse in the Isar-Danube watershed, eventually reaching the Danube River and the Black Sea. The region supports diverse aquatic life, including fish species such as barbel and chub, and the water bodies are important for local agriculture and recreation. The plant's secondary treatment helped protect downstream water quality by reducing organic pollution.