Sianow Wastewater Treatment Plant, Sianów, West Pomeranian Voivodeship, Poland

The Sianow wastewater treatment plant is located in Sianów, a town in the West Pomeranian Voivodeship of northwestern Poland. The facility serves a population of approximately 4,876 residents and has a designed capacity of 13,000 m³/day, with an actual discharge volume of 695.24 m³/day. It is situated inland, more than 10 km from the Baltic Sea coast. The plant operates at the primary treatment level, which involves physical processes such as sedimentation to remove suspended solids. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent (PE) between 2,000 and 10,000 are generally required to provide secondary treatment or an equivalent level of treatment. As a plant serving fewer than 10,000 PE, the current primary treatment may be subject to upgrade requirements to meet EU standards, especially if the receiving water body is designated as a sensitive area. The treated wastewater from the Sianow plant is discharged into local watercourses that eventually drain into the Baltic Sea via the region's river network. The Baltic Sea is a sensitive marine environment with eutrophication challenges, making nutrient removal important for plants in its catchment. The plant's location in the Pomeranian region places it within a watershed that supports diverse aquatic life and contributes to the ecological health of the southern Baltic coast.

The Sianow plant discharges into local streams that flow into the Baltic Sea via the Parsęta River or other coastal rivers. The Baltic Sea is a brackish water body with limited water exchange, making it vulnerable to nutrient pollution. The region's watershed supports diverse aquatic habitats, including wetlands and coastal lagoons, which are important for migratory birds and fish species. Effective wastewater treatment is crucial to minimize eutrophication and protect the ecological balance of this sensitive marine environment.