LIMNI Wastewater Treatment Plant, Limni, Evia, Greece

LIMNI is a municipal wastewater treatment plant located in Limni, a town in the regional unit of Evia, Central Greece. It serves a population of approximately 1,612 residents, classifying it as a small agglomeration under Greek and EU regulations. The plant is situated near the coast of the Aegean Sea, within 10 km of the shoreline. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into coastal waters. With a designed capacity of 8,200 m³/day and an actual discharge volume of 546.60 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. As a coastal facility, secondary treatment helps reduce organic load and suspended solids before discharge. The treated effluent is discharged into the Aegean Sea, a semi-enclosed sea with important marine ecosystems. The local watershed drains from the hills of Evia into the North Euboean Gulf, supporting coastal habitats and fisheries. The plant's operation under the EU directive ensures that the receiving marine environment is protected from excessive nutrient loading, which could otherwise lead to eutrophication.

The plant discharges into the Aegean Sea via the North Euboean Gulf, a coastal area with significant marine biodiversity. The local watershed includes streams from Mount Kandili that flow into the gulf, supporting coastal wetlands and fish spawning grounds. As a coastal discharge, the plant's secondary treatment helps prevent nutrient enrichment that could harm seagrass meadows and benthic communities.