Methanization unit at the Reyran water treatment plant, Fréjus (83)

The Val Estérel Mediterranean Agglomeration Community, strongly committed to the energy transition of its territory, has entrusted OTV Sud with the implementation of a methanization unit and the valorization of biogas into biomethane at the Reyran water treatment plant in Fréjus.

CLIENT’S NEEDS

• To reduce the volume of sludge and the constraints and costs of disposal
• To limit GHG emissions
• To produce biogas from sludge and transform this biogas into biomethane that can be injected into the GRDF (French electricity company) network
• To produce high quality sludge for the agricultural sector

THE SOLUTIONS

• Integration of an anaerobic digestion unit and biogas valorization into biomethane on an existing site
• Complete sludge treatment process:  thickening + digestion + centrifugation (existing dehydration) - reducing the volume of sludge to be evacuated by at least 30%.
• Biogas valorization: 
• MemGas^TM membrane technology:  state-of-the-art separative technique to purify biogas (64% methane) into biomethane (>97% methane)
• Energy recovery:  Energido
• Veolia's innovative solution for recovering heat from wastewater. The hot water produced keeps the sludge in the digester at 35°C.

THE ADVANTAGES

• High performance:  99% of the biogas is transformed into biomethane
• Easy to operate:  fully automated
• Compact:  easy to integrate on an existing site (container)
• Reduced carbon footprint:  1500T CO₂ equivalent - reduction of road traffic.
• Production of green energy generating a significant annual income