Hasselberg Wastewater Treatment Plant, Kieholm, Schleswig-Holstein, Germany

The Hasselberg wastewater treatment plant is located in Kieholm, within the municipality of Hasselberg in Schleswig-Holstein, Germany. It serves a population of 3,417 and operates with secondary treatment, which is the standard for small to medium agglomerations under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant has a designed capacity of 4,900 m³/day and currently discharges 333.92 m³/day of treated effluent. As a German facility, the plant is subject to the EU UWWTD, which requires secondary treatment for inland agglomerations above 2,000 population equivalent and more stringent treatment for sensitive areas. The plant's secondary treatment level meets the directive's requirements for its size. The plant is operated as part of the municipal wastewater infrastructure of the region, ensuring compliance with national water quality standards. The treated effluent is discharged into the local watershed, which drains into the Geltinger Bucht, a bay of the Baltic Sea. This coastal area supports diverse aquatic life and is important for migratory birds. The plant's proximity to the Baltic Sea underscores the need for effective nutrient removal to prevent eutrophication in the sensitive marine environment.

The plant discharges into the Geltinger Bucht, a coastal inlet of the Baltic Sea. The Baltic Sea is a semi-enclosed, brackish sea with limited water exchange, making it sensitive to nutrient pollution. Effective wastewater treatment is crucial to protect the local marine ecosystem, which supports fish, invertebrates, and bird populations. The region's watershed drains agricultural and forested areas, contributing to nutrient loads that the plant helps mitigate.