SIA Preilu saimnieks Robezu iela Wastewater Treatment Plant, Preiļi, Latvia

SIA Preilu saimnieks Robezu iela is a municipal wastewater treatment facility located in Preiļi, a town in eastern Latvia. The plant serves a population of approximately 5,926 residents, classifying it as a medium-sized agglomeration under EU classification. It is operated by SIA Preilu saimnieks and plays a key role in managing wastewater from the local community. 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. With a designed capacity of 11,717 m³/day and a current discharge volume of 1.04 m³/day, the facility is well-equipped to handle the region's wastewater load. Advanced treatment typically includes nutrient removal, reducing the environmental impact on receiving waters. The treated effluent is discharged into local water bodies that eventually drain into the Daugava River basin, which flows into the Baltic Sea. The plant's advanced treatment helps protect the downstream aquatic ecosystem, including the Gulf of Riga, by minimizing nutrient pollution and supporting water quality standards in the region.

The plant discharges into the Daugava River basin, which flows through Latvia and into the Gulf of Riga, a part of the Baltic Sea. The Baltic Sea is a semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, mitigating eutrophication risks in the downstream coastal environment. The local watershed supports diverse aquatic life and is an important ecological corridor for migratory fish species.