Harnessing the energy out of water and waste
Producing sustainable energy
Recovering the biogas from a water treatment station to supply cities with energy
“It is the best possible energy equation: green and 100% local production from an inexhaustible source, transported without any trucks or losses in our networks, all as part of a short circuit.”
Olivier Bitz President of Réseau GDS
In Strasbourg, France, where SUEZ operates the wastewater treatment station, we’ve teamed up with Réseau GDS, the local natural gas distributor, in the innovative BIOVALSAN project. This project consists of injecting biomethane produced from wastewater into the natural gas network. Today, it produces 1.6 million Nm3/year of purified methane, or the equivalent of the consumption of 5,000 low-consumption housing units, which is injected into the city’s existing natural gas network. BIOVALSAN was supported by the European Commission’s LIFE+ program because it has set an example for regional energy transition.
7,000 tons of CO2 emissions avoided
BIOVALSAN has two-thirds of the CO2 emissions from the La Wantzenau water treatment station, the fourth-largest in France. Which treats the water for one million people. The combined optimization of the sludge treatment and of the recovery of the biogas as energy in the form of biomethane, means that the station now has one of the smallest environmental footprints in France. This new source of renewable energy has launched the transition towards a new local, sustainable and carbon-sober energy model in Strasbourg.