Customer :

Communauté d’Agglomération de Montpellier

Role :

EPC Contractor

Key date :


Location :

Montpellier - France

Description of the Project

Integrated in the global waste management scheme as required by a large urban area, Amétyst enables the reduction of waste treated with Energy from Waste or landfilled. The facility is implementing the technologies developed by VINCI Environnement giving priority to recycling, energy recovery and compost production from the waste. The pre-composting is performed in 3 BRS®. The waste are then processed by the anaerobic digestion unit consisting in 4 double digesters of the KOMPOGAS® design, i.e. 8 x 1,400 m3 (3 for the organic fraction of the mechanically sorted Municipal Solid Waste (MSW) and 1 for kitchen waste).

 Annual treatment capacity : 203,000 tpa (170,000 tons of MSW, 33,000 tons of kitchen waste)
Production :
24,000 tpa of compost from MSW, used in agriculture and landscaping
4,000 tpa of compost from kitchen waste, used as a natural soil fertiliser
14,400 000 m3 of biogas per annum, converted into electricity and heat, i.e. 30,000 MWh per annum of electricity

Work done and added value of our solution

  • Waste sorting and preparation in a pre-composting BRS® system
  • KOMPOGAS® anaerobic digestion
  • Maturation in ECOSILO® tunnels
  • Refining of the compost to comply with the NFU 44051 standard
  • Odour treatment by scrubbing systems, bio filter and activated carbon
  • Energy recovery from biogas by cogeneration


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