KA Mehrum Wastewater Treatment Plant, Hohenhameln, Niedersachsen

KA Mehrum is an advanced wastewater treatment plant located in the Mehrum district of Hohenhameln, in the Landkreis Peine, Niedersachsen, Germany. The plant serves a population of 2,570 and has a designed capacity of 7,000 m³/day, with a current discharge volume of 570.30 m³/day. It operates under the German wastewater regulations, which implement the EU Urban Waste Water Treatment Directive (91/271/EEC). As an advanced treatment facility, it provides a higher level of nutrient removal, which is typical for plants discharging into sensitive water bodies. The plant's advanced treatment process ensures effective removal of organic matter, nitrogen, and phosphorus, meeting stringent effluent standards. The facility is part of the municipal infrastructure for Hohenhameln and the surrounding area. Its operational context aligns with the requirements for agglomerations of this size under the EU directive, which mandates secondary treatment as a minimum, with advanced treatment in sensitive areas. The treated effluent from KA Mehrum is discharged into local watercourses that eventually drain into the North Sea via the Weser river system. The plant plays a key role in protecting the water quality of the region's rivers and groundwater, supporting aquatic ecosystems and downstream uses. The advanced treatment level helps minimize nutrient loading, which is critical for preventing eutrophication in the North Sea.

The plant discharges into the local watershed, which is part of the Weser river basin. The Weser flows northward through Niedersachsen and into the North Sea. The region's water bodies support diverse aquatic life, including fish species and macroinvertebrates. The advanced treatment at KA Mehrum reduces nutrient inputs, helping to maintain the ecological balance of the receiving waters and contributing to the health of the downstream marine environment.