Daruvar Wastewater Treatment Plant, Daruvar, Croatia - Secondary Treatment

The Daruvar wastewater treatment plant is located in the city of Daruvar, in the Bjelovarsko-bilogorska županija region of Croatia. It serves the local population and is part of the country's municipal wastewater infrastructure, operating under Croatian and EU environmental regulations. The plant provides secondary treatment, which is the standard biological treatment stage required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. Its designed capacity of 23,000 m³/day indicates it is sized to handle significant wastewater flows from the urban area. Treated effluent from the plant is discharged into local watercourses, which eventually drain into the Sava River basin and ultimately the Danube River and Black Sea. The plant plays a key role in protecting the region's water quality and supporting the ecological health of downstream aquatic environments.

The Daruvar plant discharges into the local river system, which flows into the Sava River, a major tributary of the Danube. The Danube then carries water to the Black Sea. This watershed supports diverse aquatic life and is important for migratory fish species. The plant's secondary treatment helps reduce organic pollutants and nutrients, mitigating eutrophication risks in downstream water bodies.