TWANN TLT Wastewater Treatment Plant, Ligerz, Bern, Switzerland

TWANN TLT is a wastewater treatment plant located in Ligerz, within the canton of Bern, Switzerland. The facility serves a population of 1,900 and is designed to handle up to 6,000 m³ of wastewater per day, with an average daily discharge of 862.45 m³. As an advanced treatment plant, it provides a high level of pollutant removal, ensuring compliance with Swiss water protection standards. The plant operates under Switzerland's stringent water protection regulations, which are aligned with the EU Urban Waste Water Treatment Directive. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The facility's capacity utilization is low relative to its design, indicating room for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into Lake Biel (Bielersee), a large mesotrophic lake in the Seeland region. Lake Biel is part of the Aare river system, which flows into the Rhine. The plant plays a key role in preserving water quality in this ecologically important area, supporting aquatic life and recreational uses.

The plant discharges into the local watershed that feeds Lake Biel (Bielersee), a large lake in the Seeland region of Switzerland. Lake Biel is connected to the Aare river, which flows into the Rhine, eventually reaching the North Sea. The lake supports diverse aquatic life and is used for recreation and drinking water. Advanced treatment at TWANN TLT helps control nutrient inputs, preventing eutrophication and maintaining the lake's ecological balance.