TP 19 of Auran asseutu Wastewater Treatment Plant, Aura, Finland

TP 19 of Auran asseutu is a wastewater treatment facility located in Aura, within the Loimaa sub-region of Varsinais-Suomi, Finland. The plant serves a population of around 2,400, making it a small-scale municipal treatment facility. It operates under Finland's national regulations, which align with the EU Urban Waste Water Treatment Directive (91/271/EEC), ensuring appropriate treatment for communities of this size. The plant employs advanced treatment processes, which go beyond the EU's minimum requirement of secondary treatment for agglomerations under 10,000 population equivalent. This high level of treatment effectively removes nutrients and other pollutants, protecting the receiving water bodies from eutrophication and other environmental impacts. The plant's discharge volume is approximately 393.35 cubic meters per day, reflecting its capacity to handle the local wastewater load. The treated effluent is discharged into local watercourses that eventually drain into the Baltic Sea, a sensitive marine environment. The Baltic Sea is known for its vulnerability to nutrient pollution, and advanced treatment at plants like TP 19 helps reduce the nutrient load entering the sea. The plant's inland location, more than 10 km from the coast, further minimizes direct marine impact, though its discharge contributes to the broader watershed health.

The plant's discharge flows into the local river system within the Varsinais-Suomi region, which ultimately drains into the Archipelago Sea and the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it highly sensitive to nutrient inputs. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, mitigating eutrophication risks in downstream coastal waters and supporting aquatic biodiversity in the region.