Ryjewo Wastewater Treatment Plant - Mątowskie Pastwiska, Poland

The Ryjewo wastewater treatment plant is located in Mątowskie Pastwiska, a village in the Pomeranian Voivodeship of northern Poland. It serves a population of approximately 2,451 people, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from the Baltic coast, and its operations are part of the regional water management infrastructure. The facility provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,075 m³/day and an average discharge volume of 349.47 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse that ultimately drains into the Vistula River basin, one of Poland's major river systems. The Vistula flows northward into the Baltic Sea, making the plant's operations relevant to the ecological health of both the river and the coastal marine environment. Proper treatment helps protect downstream aquatic habitats and supports water quality standards in the region.

The plant discharges into a tributary of the Vistula River, which flows through northern Poland and empties into the Baltic Sea via the Vistula Lagoon. The Vistula basin supports diverse aquatic life, including migratory fish species such as salmon and sturgeon. The Baltic Sea is a sensitive brackish environment with eutrophication challenges, making nutrient removal from wastewater important for downstream ecosystem health.