KA Holle Wastewater Treatment Plant, Holle, Niedersachsen | Advanced Treatment

KA Holle is an advanced wastewater treatment plant located in Holle, within the Landkreis Hildesheim district of Niedersachsen, Germany. The plant serves a population of approximately 7,552 residents, reflecting its role as a medium-sized municipal facility in a rural-urban setting. The plant employs advanced treatment processes, ensuring high-quality effluent standards. With a designed capacity of 9,500 m³/day and an actual discharge volume of 840.97 m³/day, the facility operates well below its capacity, indicating potential for future growth or seasonal variations. As a German plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size, with advanced treatment required in sensitive areas. The treated effluent is discharged into local water bodies that ultimately drain into the Weser River basin, contributing to the North Sea watershed. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports regional water quality goals.

The plant discharges into local streams that are part of the Innerste River system, a tributary of the Leine River, which flows into the Weser and eventually the North Sea. This watershed supports diverse aquatic life and is used for recreation and agriculture. The advanced treatment level helps minimize nutrient loading and protects sensitive downstream habitats.