GESA pur SE 50 Oczyszczalnia sciekow, Zernica - Primary Wastewater Treatment Plant

The GESA pur SE 50 Oczyszczalnia sciekow is a wastewater treatment plant located in Zernica, a village in the Silesian Voivodeship of southern Poland. It serves a small population of 423 residents, reflecting its role as a local facility for a rural community within the Gmina Pilchowice area. As a primary treatment plant, it provides basic mechanical treatment including sedimentation to remove settleable solids. With a designed capacity of 194.00 m³/day and an actual discharge volume of 60.31 m³/day, the plant operates well below its capacity. Under Polish regulations implementing the EU Urban Waste Water Treatment Directive, small agglomerations under 2,000 population equivalent are required to provide appropriate treatment, with primary treatment being acceptable for discharges to less sensitive waters. The plant's treated effluent is discharged into local watercourses that ultimately drain into the Oder River basin. The Oder flows northward to the Baltic Sea, passing through industrial and agricultural areas. The plant's location inland, away from coastal zones, reduces direct marine impact, but its primary treatment level means that nutrient removal is limited, potentially affecting downstream water quality in the Oder catchment.

The plant discharges into local streams within the Oder River basin, which flows through southwestern Poland and into the Baltic Sea via the Szczecin Lagoon. The Oder basin supports diverse aquatic ecosystems and is an important migratory corridor for fish. The plant's primary treatment provides basic solids removal but limited nutrient reduction, which may contribute to eutrophication pressures in downstream waters, particularly the Baltic Sea, which is sensitive to nitrogen and phosphorus loads.