Keila Joa reoveepuhasti - Advanced Wastewater Treatment in Meremõisa, Estonia

Keila Joa reoveepuhasti is an advanced wastewater treatment plant located in Meremõisa, a village in Lääne-Harju Parish, Harju County, Estonia. The plant serves a small population of 650 people and has a design capacity of 2,000 m³/day, with an actual discharge volume of 149.76 m³/day. As an advanced treatment facility, it provides a higher level of pollutant removal than secondary treatment, which is typical for plants in sensitive areas. Estonia, as an EU member state, implements the Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for discharges into sensitive areas. For small agglomerations like this, advanced treatment helps protect the local environment. The plant is situated within 10 km of the Baltic Sea coast, making its discharge potentially impactful on coastal waters. The treated effluent likely flows into the Gulf of Finland, a sensitive marine ecosystem that supports diverse aquatic life and is important for regional biodiversity. The plant's advanced treatment helps minimize nutrient loading and protect the coastal environment.

The plant discharges into the Baltic Sea via the Gulf of Finland, a brackish water body with limited water exchange, making it sensitive to nutrient pollution. The surrounding watershed includes coastal streams and wetlands that support migratory birds and fish species. Advanced treatment reduces nitrogen and phosphorus loads, helping to mitigate eutrophication in the Gulf of Finland, which is a key ecological concern for the region.