KA Bergen Hohne Wastewater Treatment Plant, Lohheide, Niedersachsen

KA Bergen Hohne is an advanced wastewater treatment plant located in the Hörsten area of Lohheide, within the Landkreis Celle district of Niedersachsen, Germany. The plant serves a population of approximately 2,382 and has a designed capacity of 9,000 m³/day, with an average discharge volume of 602.83 m³/day. As an advanced treatment facility, KA Bergen Hohne goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, meeting the stringent requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for sensitive areas. The plant's scale places it in the small agglomeration category, for which the directive mandates appropriate treatment to protect receiving waters. The plant discharges treated effluent into local watercourses that ultimately drain into the Aller River system, a tributary of the Weser River. The Weser flows into the North Sea, making the plant's advanced treatment crucial for preventing eutrophication in downstream coastal waters. The surrounding region features mixed agricultural and forested landscapes, with the nearby Lüneburg Heath adding ecological sensitivity.

The treated effluent from KA Bergen Hohne enters local streams that feed into the Aller River, a major tributary of the Weser River. The Weser flows through northwestern Germany before discharging into the North Sea. This watershed supports diverse aquatic life, including fish species such as salmon and sea trout, and the advanced treatment helps reduce nutrient loading that could otherwise contribute to algal blooms in the North Sea.