TP 977 of Ylistaron kk - Advanced Wastewater Treatment Plant in Seinäjoki, Finland

TP 977 of Ylistaron kk is an advanced wastewater treatment facility located in the Ylistaron district of Seinäjoki, in the Etelä-Pohjanmaa region of Finland. The plant serves a population of approximately 2,200 residents, reflecting its role in a smaller agglomeration within the Finnish wastewater infrastructure. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, the directive mandates secondary treatment, but Finland often implements advanced treatment to protect sensitive water bodies. The treated effluent from TP 977 of Ylistaron kk is discharged into local waterways that ultimately drain into the Gulf of Bothnia, part of the Baltic Sea. The Baltic Sea is a sensitive marine environment with eutrophication challenges, making advanced nutrient removal critical. The plant's location within 50 km of the coast underscores its role in protecting downstream coastal and marine ecosystems.

The plant discharges into local rivers that flow through the Seinäjoki region and eventually reach the Gulf of Bothnia, a northern arm of the Baltic Sea. The Baltic Sea is a brackish water body with limited water exchange, making it highly susceptible to nutrient pollution. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, supporting the ecological health of downstream rivers and the sensitive marine environment.