Balice Wastewater Treatment Plant, Kraków, Poland

Balice is a wastewater treatment plant located in the Zwierzyniec district of Kraków, within the małopolskie province of Poland. It serves a population of 5,234, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated near the Olszanica area, close to the Kraków-Balice airport. The facility provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 6,500 m³/day and an average daily discharge of 746.29 m³/day, the plant operates well below its capacity, indicating potential for future growth. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated wastewater is discharged into the local watershed, which ultimately drains into the Vistula River, Poland's longest river. The Vistula flows northward through Kraków and eventually reaches the Baltic Sea via the Gdańsk Bay. The plant plays a key role in protecting the Vistula's water quality, supporting aquatic life and downstream ecosystems.

Balice plant discharges into the Vistula River basin, which flows through Kraków and into the Baltic Sea. The Vistula supports diverse aquatic life and is an important migratory corridor for fish. The plant's secondary treatment helps reduce nutrient loads, mitigating eutrophication risks in the Baltic Sea, a sensitive marine environment.