Kohila reoveepuhasti - Advanced Wastewater Treatment in Rapla maakond, Estonia

Kohila reoveepuhasti is an advanced wastewater treatment facility located in Kohila alev, Rapla maakond, Estonia. The plant serves a population of approximately 3,700 residents, operating as part of the municipal wastewater infrastructure in the region. As an advanced treatment plant, Kohila reoveepuhasti goes beyond secondary treatment to remove nutrients and other pollutants, meeting stringent discharge standards. The plant has a designed capacity of 6,500 m³/day and currently treats an average daily flow of 852.47 m³, indicating ample reserve capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), Estonia classifies agglomerations over 2,000 population equivalents as requiring secondary treatment, and sensitive areas may necessitate tertiary treatment. The treated effluent is discharged into local inland waters, ultimately draining into the Baltic Sea via the Harju basin. The plant plays a key role in protecting the region's water quality and supporting downstream aquatic ecosystems.

Kohila reoveepuhasti discharges treated wastewater into local streams that flow into the Harju River basin, eventually reaching the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, mitigating eutrophication risks in coastal waters and supporting the health of the marine environment.