The Saur Group, through its subsidiaries Saur France (lead contractor) and Stereau, has been awarded a contract by the Lille European Metropolis (MEL) to expand, modernize, and manage operations at the Wattrelos wastewater treatment plant. This initiative, carried out in a consortium, stands among France’s most significant wastewater treatment modernization projects in the coming decade.
Enhancing Capacity and Environmental Excellence
The project aims to increase the plant’s treatment capacity, optimize rainwater pollution management, and integrate advanced wastewater treatment and renewable energy production. The total investment amounts to €200 million for construction and modernization, with Saur France managing operations over 12 years for an additional €93 million.
Originally commissioned in 1986 and last upgraded in the early 2000s, the Wattrelos plant currently serves 417,000 population equivalents across 15 municipalities in MEL and the Belgian town of Mouscron. Following its modernization, set for completion in 2031, the plant’s capacity will increase by more than 20% to serve 511,500 population equivalents.
The upgraded facility will incorporate innovative technologies to meet evolving regulatory standards, including micropollutant treatment and treated wastewater reuse.
A Benchmark in Energy Efficiency and Sustainability
Designed to be a net energy producer, the modernized Wattrelos plant will contribute to regional decarbonization efforts. Key sustainability features include:
- Renewable energy generation: 6,000 m² of photovoltaic panels and hydroelectric turbines covering over 10% of the plant’s electricity needs.
- Green energy sourcing: The remaining energy will come from a green energy purchasing contract and waste heat recovery from equipment.
- Biogas production: Biomethane from sludge treatment will equate to the annual gas consumption of 2,800 residents.
- District heating: Dried sludge will provide heating for 1,500 homes.
The plant will operate under strict performance, environmental, and community well-being standards and achieve ISO 55 001 certification for sustainable asset management.
Leadership Perspectives
Estelle Grelier, President of Saur France:
“This large-scale project aligns with the Saur Group’s mission of placing water transition at the heart of its strategy. As a driver of local sustainable ecology, the facility will serve as a strategic regional asset, setting a benchmark for resilience and environmental performance. By becoming a net energy producer, it will leave a lasting legacy for future generations.”
Hugo Bardi, Chairman of Stereau:
“With this extension-reconstruction project, Stereau reaffirms its expertise in designing and building critical infrastructure. This facility will exemplify environmental performance, combining cutting-edge wastewater treatment with green energy production, supporting resource conservation, circular economy principles, and decarbonization.”