Krajenka Wastewater Treatment Plant, Kamionki, Poland

The Krajenka wastewater treatment plant is located in Kamionki, within the gmina Kórnik of the poznański powiat in województwo wielkopolskie, Poland. It serves a population of approximately 6,968, classifying it as a small to medium agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the regional water management infrastructure. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 10,770 m³/day and an actual discharge volume of 993.53 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local water bodies, ultimately contributing to the Warta River basin, which flows into the Oder River and then to the Baltic Sea. The plant plays a key role in protecting the local watershed from pollution, supporting aquatic life and downstream ecosystems. Its operation aligns with Poland's commitments under the EU Water Framework Directive to achieve good ecological status for water bodies.

The plant discharges into local streams that are part of the Warta River catchment, a major tributary of the Oder River. The Oder flows into the Szczecin Lagoon and then the Baltic Sea. The watershed supports diverse aquatic habitats and is important for migratory fish species. The plant's secondary treatment helps reduce nutrient loads, mitigating eutrophication risks in the Baltic Sea.