Mielnik Wastewater Treatment Plant, Mielnik | Poland

The Mielnik wastewater treatment plant is located in the town of Mielnik, within the gmina Mielnik, powiat siemiatycki, województwo podlaskie, Poland. This facility serves a small population of 76 residents, reflecting its role in a rural community. As a secondary treatment plant, Mielnik meets the standard requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this scale. The plant has a designed capacity of 2003 cubic meters per day, with a reported discharge volume of 10.84 cubic meters per day, indicating low utilization relative to capacity. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Bug River, a tributary of the Narew River, and then into the Vistula River before reaching the Baltic Sea. This inland location supports the ecological health of the Bug River basin, which provides habitat for diverse aquatic species and contributes to the region's water quality.

The Mielnik plant discharges into the local watershed that feeds the Bug River, a major tributary of the Narew River, which flows into the Vistula River and eventually reaches the Baltic Sea. The Bug River basin supports diverse aquatic life and is an important ecological corridor in eastern Poland. The plant's secondary treatment helps protect this downstream environment from nutrient pollution and organic matter.