Gelgaudiskio aglomeracija Wastewater Treatment Plant, Gelgaudiškis, Lithuania

Gelgaudiskio aglomeracija is a wastewater treatment plant located in Gelgaudiškis, a town in the Marijampolė County of Lithuania. The plant serves a small population of 440 residents, reflecting its role in a rural agglomeration. It is situated near the Nemunas River, a major watercourse in the region. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 3000 m³/day, with an actual discharge volume of 61.52 m³/day, indicating low utilization relative to capacity. The plant operates within Lithuania's national regulatory framework, which implements EU directives. Treated effluent is discharged into the local environment, likely into the Nemunas River or its tributaries. The Nemunas River flows into the Curonian Lagoon and then into the Baltic Sea, making the plant's operations relevant to the ecological health of these downstream water bodies. The region supports diverse aquatic life and is part of a broader transboundary river basin.

The plant discharges into the Nemunas River basin, which flows through Lithuania and into the Curonian Lagoon, a sensitive coastal ecosystem, before reaching the Baltic Sea. The Nemunas River supports diverse fish populations and migratory bird species. The plant's secondary treatment helps reduce organic pollution and nutrient loads, contributing to the protection of downstream water quality in the lagoon and sea.