Koeru reoveepuhasti - Advanced Wastewater Treatment Plant in Rõhu, Estonia

Koeru reoveepuhasti is an advanced wastewater treatment plant located in Rõhu, Järva County, Estonia. The facility serves a population of approximately 1,096 people and has a designed capacity of 2,100 m³ per day, with an average discharge volume of 252.52 m³ per day. As an advanced treatment plant, Koeru reoveepuhasti goes beyond secondary treatment to remove nutrients and other pollutants, ensuring high-quality effluent. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations under 10,000 population equivalent are generally required to provide secondary treatment, but Estonia has implemented advanced treatment in sensitive areas to protect water quality. The treated effluent from Koeru reoveepuhasti is discharged into local water bodies that eventually drain into the Baltic Sea via the Gulf of Finland. The plant plays a key role in safeguarding the region's rivers and lakes from nutrient pollution, supporting aquatic ecosystems and downstream water quality.

The plant discharges into local streams that flow into the Põltsamaa River, a tributary of the Emajõgi River, which ultimately drains into Lake Peipus and then the Gulf of Finland. This watershed supports diverse aquatic life and is important for migratory fish. Advanced treatment helps reduce nutrient loading, protecting the sensitive Baltic Sea ecosystem from eutrophication.