Cryo Collect

10% Increase in Yield at Serres des Trois Moulins with Méthatreil’s BioCO₂

Jean-François Vinet, co-manager and operator of Serres des Trois Moulins, image by VerdeMobil Biogaz

The collaboration between the Méthatreil biomethane plant, located in Machecoul, and the Serres des Trois Moulins greenhouses, located in Saint-Philbert-de-Grand-Lieu in the Loire Atlantique department, dates back to 2020. Méthatreil was then the first installation to valorize bioCO2 in France by supplying the Serres des Trois Moulins. The Brosse Tenaud site spans 13 hectares of greenhouses for cucumbers and tomatoes, and 250 hectares outdoors for lamb’s lettuce, lilies of the valley, and salads. Jean-François Vinet, co-manager and operator, explains in this video that CO2 is essential for greenhouse crop productivity and that it allows for a 10% increase.

The first bioCO2 tank at Serres des Trois Moulins, photo by Frédéric Douard

Méthatreil purifies and liquefies its CO2 through a cold distillation process called Carboliq. To achieve this, it enlisted the help of VerdeMobil Biogaz, which manufactures and markets this innovative process in France, developed by the startup CryoCollect. The process recovers the low-grade gas from the biomethane purification module and, through a series of thermodynamic and physical operations, isolates the CO2 in liquid form.

The second BioCO2 tank at Serres des Trois Moulins, photo by VerdeMobil Biogaz

The CO2 is then stored at the methanation site in two vertical tanks of 60 m³, before being transported once or twice a week by a 20 m³ tanker truck to two 30 m³ relay tanks positioned at the greenhouse site, 15 kilometers from Machecoul. The annual production of CO2 is 1,500 tons, which only meets part of the site’s needs.

Contacts :

  • Serres des Trois Moulins :
  • MéthaTreil : Erwan Bocquier
 / +33 626 737 530 –
  • Purification et liquéfaction CO2 : CryoCollect 
- Haytham Sayah / +33 647 56 28 17 –
 – VerdeMobil Biogaz / +33 647 00 21 92 – –

Frédéric Douard

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