Bjelovar Wastewater Treatment Plant - Grad Bjelovar, Croatia

The Bjelovar wastewater treatment plant is a key municipal facility serving Grad Bjelovar in the Bjelovarsko-bilogorska županija region of Croatia. With a designed capacity of 50,000 m³/day, it is sized to handle the wastewater from the city and surrounding areas, supporting public health and environmental quality. As a secondary treatment plant, Bjelovar provides biological treatment to remove organic matter and suspended solids. This level of treatment is standard for inland plants in Croatia, aligning with the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this scale. The plant's capacity suggests it serves a population equivalent well above 10,000, placing it in the medium to large agglomeration category. The treated effluent from Bjelovar is discharged into local watercourses that ultimately drain into the Sava River basin, a major tributary of the Danube. The Sava River supports diverse aquatic life and is an important ecological corridor in the region. By treating wastewater to secondary standards, the plant helps reduce nutrient and pollutant loads, protecting downstream water quality and ecosystems.

The Bjelovar plant discharges into local streams that flow into the Sava River, which then joins the Danube River before reaching the Black Sea. The Sava River basin is ecologically significant, supporting diverse fish populations and riparian habitats. The plant's secondary treatment reduces organic pollution and nutrient inputs, helping to maintain water quality in this sensitive watershed.