Overview
Sonajala wastewater treatment plant in Hiiu maakond, Estonia, is a closed secondary treatment facility with a designed capacity of 72.00 m³/day, located within 10 km of the coast.
Sonajala wastewater treatment plant is located in Paluküla, Hiiumaa vald, Hiiu maakond, Estonia. The plant is currently closed and served the local community with secondary treatment. Its designed capacity was 72.00 m³/day, indicating it was a small-scale facility. As a closed plant, it no longer operates, but during its operation it would have been subject to Estonian regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC). For small agglomerations, secondary treatment is typically required, and discharge standards apply based on the sensitivity of the receiving environment. The plant is situated within 10 km of the Baltic Sea coast, making its discharge location environmentally sensitive. The treated effluent would have flowed into local watercourses eventually reaching the Baltic Sea, a brackish sea with limited water exchange, where nutrient inputs can contribute to eutrophication.
Environmental context
The plant is located on Hiiumaa island, within 10 km of the Baltic Sea coast. The Baltic Sea is a semi-enclosed brackish sea with limited water exchange, making it highly sensitive to nutrient pollution. Local streams and groundwater on the island drain directly into the sea, so any discharge from the plant would have affected coastal water quality and marine ecosystems, including fish spawning grounds and migratory bird habitats.
Frequently asked questions
Sonajala wastewater treatment plant is located in Paluküla, Hiiumaa vald, Hiiu maakond, Estonia, on the island of Hiiumaa in the Baltic Sea.
The plant is currently closed and no longer in operation.
Sonajala provided secondary treatment, which typically involves biological processes to reduce organic matter and suspended solids.
As an Estonian plant, it operated under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for small agglomerations and more stringent treatment in sensitive areas like coastal zones.
Being within 10 km of the Baltic Sea coast, the plant's discharge would have directly impacted the sensitive marine environment, where nutrient loading can cause eutrophication and harm aquatic life.
Nearby plants