Oczyszczalnia Wastewater Treatment Plant, Kraszewice, Greater Poland

Oczyszczalnia is a municipal wastewater treatment plant located in Kraszewice, a village in the Greater Poland Voivodeship of Poland. The plant serves a small population of 939 residents, reflecting its role in a rural community. Its location in the Prosna River basin places it within the Oder River catchment area. 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 (PE) between 2,000 and 15,000. Although the population served is below 2,000, the plant's designed capacity of 12,000 m³/day suggests it may also handle industrial or seasonal loads. The current discharge volume of 133.89 m³/day indicates a low utilization rate relative to capacity. Treated effluent from the plant is discharged into local watercourses that ultimately drain into the Prosna River, a tributary of the Warta River, which flows into the Oder River and then to the Baltic Sea. The plant's operation helps protect the local aquatic ecosystem and downstream water quality in the Oder basin.

The plant discharges into the Prosna River basin, part of the Oder River catchment that drains into the Baltic Sea. The Oder basin supports diverse aquatic life and is an important migratory corridor for fish species. The plant's secondary treatment reduces organic pollutants and suspended solids, helping to maintain water quality in the downstream river system.