In this interview, the President of Athena Recherche et Innovation explains how bacteria can transform the organic matter contained in wastewater into hydrogen and biogenic CO₂. This innovative technology replaces traditional treatments, reducing energy consumption and generating energy instead of consuming it. The benefits are numerous: valuable by-products such as biogenic CO₂ and biochar are produced, carbon capture is enhanced, and treated water can be reused. Additionally, the process is economically advantageous, with costs up to 15% lower than conventional methods. The main challenge remains scaling up from the laboratory to large-scale production.