Rajgrod Wastewater Treatment Plant, Radziłów, Poland

Rajgrod wastewater treatment plant is located in Radziłów, a town in the podlaskie province of northeastern Poland. The facility serves a population of 714 and operates under Polish regulations aligned with the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant provides secondary treatment, which typically involves biological processes to reduce organic matter and suspended solids. With a designed capacity of 4,000 m³/day and an actual discharge volume of 101.81 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into local waterways that ultimately drain into the Biebrza River, a major tributary of the Narew River, which flows into the Vistula River and then to the Baltic Sea. The Biebrza River basin is ecologically significant, supporting diverse aquatic life and wetlands.

The plant discharges into the Biebrza River basin, which is part of the larger Narew-Vistula system flowing to the Baltic Sea. The Biebrza River is known for its extensive wetlands and floodplains, which provide critical habitat for migratory birds and aquatic species. The secondary treatment helps protect these sensitive ecosystems from nutrient pollution and organic loading.