Švenčionėlių Aglomeracija Wastewater Treatment Plant, Sudota, Lithuania

Švenčionėlių aglomeracija is a wastewater treatment plant located in Sudota, within the Švenčionys district of Vilniaus apskritis, Lithuania. It serves a population of approximately 6,000 people, classifying it as a small to medium agglomeration under EU standards. The plant is situated in a rural inland area, contributing to the region's sanitation infrastructure. The facility employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 9,900 m³/day and a reported discharge volume of 939.97 m³/day, the plant operates well within its capacity. As a Lithuanian facility, it adheres to national regulations that transpose EU directives, ensuring high environmental standards. The treated wastewater is discharged into local rivers that drain into the Neris River basin, eventually reaching the Baltic Sea. The advanced treatment level helps protect downstream aquatic ecosystems and supports the ecological health of the region's water bodies. The plant plays a key role in maintaining water quality in the Vilniaus apskritis area.

The plant discharges into the Neris River basin, which flows into the Nemunas River and ultimately the Baltic Sea. This watershed supports diverse aquatic life and is an important migratory corridor for fish species. Advanced treatment reduces nutrient loads, helping to prevent eutrophication in downstream waters and the Baltic Sea.