The biogas plant project “Charpentier” was developed and is operated by the French company “CPL Biogaz” especially by his managing director Baptiste Charpentier who is active in the field of agricultural production and logistics . BioConstruct was chosen for the delivery and installation of the whole fermentation line including feeding technology, fermentation and storing of digestate. The biogas plant was built in cooperation with the French engineering office SAS ASTECA. The construction of the plant was started in August 2020 and the commissioning of the gas purification unit was realized in June 2021. The location of this project is the village Chailly en Brie which is based in the eastern part of Paris (France).
The inputs for the biogas plant are basically agricultural residual products like sugar beet pulp, cereal waste and energy crops like rye whole plant silage and maize silage. The total input amount of 17.000 t/a represents a capacity of approx. 180 Nm³/h biomethane. Therefore the produced biogas is upgraded by a gas purification unit to biomethane. The biomethane is then fed into the local gas grid.
The technology feature of this biogas plant is the special feeding technology which consists of one solid feeder dosing unit including a hydraulic pushing floor and mixing screw. This dosing unit can be filled up with different kind of substrates like whole plant silage; cattle manure; sugar beet pulp etc. The substrate are all mixed up by the mixing screw and afterwards forwarded to a mixing pump including shredding unit, which is able to cut bigger lumps into small particles and in addition to mix up the solid substrate with liquids. This technology also enables to separate heavy artificial parts like stones. After this process, the homogenous mixture is directly pumped into the fermenter tank. This technology enables a flexible feeding with different kind of substrates and also reduces the own consumption costs of the biogas plant because of less mixing time in the fermenter tank. For the reception of liquid manure or comparable, a separate slurry store is available at the biogas plant. From this tank the liquids are automatically pumped into the fermenter tanks. After the fermentation process, the digestate is pumped into the storage tank and is available for fertilizing purposes in the fields again.