Karolinki Wastewater Treatment Plant, Wielkopolskie, Poland

The Karolinki wastewater treatment plant is located in the village of Karolinki, within the gmina Miejska Górka in the powiat rawicki of województwo wielkopolskie, Poland. The facility serves a population of 2,530 and is part of the municipal wastewater infrastructure for the local community. The plant provides secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. The designed capacity of 8,868 m³/day is significantly higher than the current discharge volume of 360.74 m³/day, indicating ample capacity for future growth. The treated effluent is discharged into local watercourses that ultimately drain into the Oder River basin, which flows into the Baltic Sea. The plant plays a key role in protecting the region's surface waters from nutrient pollution and supporting the ecological health of downstream aquatic habitats.

The plant discharges into the Oder River basin, which flows northward through western Poland and into the Szczecin Lagoon before reaching the Baltic Sea. The Oder basin supports diverse aquatic life and is an important migratory corridor for fish species. The secondary treatment helps reduce organic load and nutrient inputs, protecting downstream water quality and the sensitive coastal ecosystem of the Baltic Sea.