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Field Trip


5 July

09:00 to 12:30





Lausanne, city of water

Meeting point: Lausanne train station (main hall); transport by public service bus

Number of participants: 20

Registration fee: CHF 17 (includes transport)

Organizer and Sponsor: City of Lausanne

Contact: Cristina Garcia (


Built in 1964, the Vidy wastewater treatment plant (WWTP) treats wastewater from the city of Lausanne and fifteen nearby municipalities. As it no longer complies with current environmental protection laws and cannot keep pace with the constant population growth of Switzerland’s fourth-largest city, a thorough renovation of the WWTP has become necessary. Upgrades to include complete nitrification of the water by biofiltration, advanced treatment of suspended solids, treatment of micropollutants, hygienisation of the water, sludge treatment by anaerobic digestion and recovery of the biogas produced, while never disrupting service. You will learn about how a complete overhaul of a treatment system, including its significant site-related constraints such as a compact, closed environment, and a recreational area near the lake, can be executed without interrupting operations.

Learn about the complexity of overhauling a wastewater treatment plant (WWTP) built in the Sixties to comply with new environmental protection laws and keep pace with population growth.

Station d’épuration des eaux (STEP)


Epura - En route vers le Futur!

Station d'épuration de Lausanne: travaux de transformation (2015-2018) - version courte

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