Kirchdorf Wastewater Treatment Plant, Island of Poel, Mecklenburg-Vorpommern

Kirchdorf wastewater treatment plant is located on the island of Poel in the Baltic Sea, serving the town of Kirchdorf in Mecklenburg-Vorpommern, Germany. The plant provides advanced treatment for a population equivalent of 3,870, with a designed capacity of 10,000 m³/day. As a German facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment levels based on the sensitivity of the receiving waters. The plant's advanced treatment level exceeds the secondary treatment standard typically mandated for agglomerations of this size, reflecting the ecological sensitivity of the coastal environment. Treated wastewater is discharged into the Baltic Sea, a semi-enclosed sea with limited water exchange, making nutrient removal critical to prevent eutrophication. The plant plays a key role in protecting the coastal waters of the Baltic Sea, which support diverse marine life and are important for tourism and fisheries in the region.

The plant discharges into the Baltic Sea, a brackish inland sea connected to the North Sea via the Kattegat and Skagerrak. The Baltic Sea is ecologically sensitive due to its low salinity, limited water exchange, and vulnerability to nutrient pollution, which can cause algal blooms and oxygen depletion. The advanced treatment at Kirchdorf helps reduce nutrient loads, supporting the health of coastal ecosystems and marine biodiversity.