Langballig Wastewater Treatment Plant, Schleswig-Holstein, Germany

Langballig wastewater treatment plant is located in the municipality of Langballig, in the Schleswig-Flensburg district of Schleswig-Holstein, Germany. The plant serves a population of approximately 3,000 and is situated near the Baltic Sea coast. The facility provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 4,000 cubic meters per day and currently treats an average daily volume of about 331 cubic meters, indicating ample reserve capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Baltic Sea. The Baltic Sea is a sensitive marine environment with limited water exchange, making nutrient removal important for preventing eutrophication. The plant's secondary treatment helps reduce organic pollutants and nutrients, contributing to the protection of coastal water quality.

The plant discharges into small streams that flow into the Flensburg Fjord, a Baltic Sea inlet. The Baltic Sea is a brackish, semi-enclosed sea with low biodiversity and high sensitivity to nutrient pollution. Eutrophication from nitrogen and phosphorus inputs is a major concern, and secondary treatment helps mitigate this by reducing organic loads. The coastal waters support diverse aquatic life, including fish spawning grounds and migratory bird habitats.