STEP de Villette

Villette: A changing wastewater treatment plant


Activated sludge processing
The Villette wastewater treatment plant is located in the municipality of Thônex (GE) close to the border with France. It was officially opened in 1962 before being extended in 1979. Now experiencing overloads, it is no longer capable of meeting current standards governing the treatment of nitrogen and micropollutants and must be completely brought up to speed. The Services Industriels de Genève (SIG) are in charge of this project, which involves conventional treatment using activated sludge and reusing existing operational buildings and certain facilities of the sludge processing.

Securing the region's drinking water supply
With a total budget of 50 million CHF, including 10 million for the treatment of micropollutants alone, the work currently being carried out will enable the plant to become a modern wastewater treatment facility, with a robust treatment process and the capacity for cross-border micropollutant treatment. It will have a capacity of 8,000 inhabitant equivalents (biological treatment) and 200,000 inhabitant equivalents (treatment of micropollutants), covering the Annemasse region and the wider metropolitan area. This treatment process will ensure that the drinking water supply for the region remains secure.

BG - a general planner
For this project, on which work began in 2016 and which is scheduled for completion in 2023, BG occupies the role of general planner as part of a consortium for architectural work (AS DZ Architecture SA), electricity and automation (SIG - IPRO). BG is also in charge of project management; coordination and the treatment process; civil engineering and heating, ventilation, air conditioning and sanitation for SIA (The Swiss Society of Engineers and Architects) phases 31 to 53.

A complete BIM model
The Villette wastewater treatment plant is also BG’s first fully BIM-designed wastewater treatment plant and among the first of its kind in Switzerland. The use of BIM allowed to develop a 3D-model entirely based on the project at detailed design phase, bringing different project teams together and ensuring a greater degree of reliability in terms of project design. This process does require large-scale investment and puts pressure on schedules, owing to the way in which working methods and objects are developed parallel to graphic production.

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