Kazlu Rudos aglomeracija Wastewater Treatment Plant, Kazlai I, Lithuania

Kazlu Rudos aglomeracija is an advanced wastewater treatment plant located in Kazlai I, within the Kazlu Ruda municipality of Marijampole County, Lithuania. The plant serves a population of 2,100 and has a designed capacity of 8,300 cubic meters per day, with an average discharge volume of 940 cubic meters per day, indicating significant reserve capacity for future growth. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants, meeting stringent standards under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (2,100 population equivalent), the directive requires secondary treatment, but the plant's advanced level suggests it operates in a sensitive area or under national requirements for higher effluent quality. The treated effluent is discharged into local water bodies within the Nemunas River basin, which ultimately flows into the Curonian Lagoon and the Baltic Sea. The plant plays a key role in protecting the region's water resources, supporting aquatic life and reducing nutrient loads that could contribute to eutrophication in downstream ecosystems.

The plant discharges into the Nemunas River basin, which drains into the Curonian Lagoon and then the Baltic Sea. This watershed is ecologically sensitive, supporting diverse aquatic habitats and migratory fish species. Advanced treatment helps minimize nutrient pollution, reducing the risk of algal blooms in the lagoon and coastal waters.