Published on November 8, 2024 at 10:15 p.m. / Modified on November 9, 2024 at 07:37.
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Operating a biogas plant is ideal for the planet but complicated from a financial point of view.
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Public support is needed and this is considered too weak. An order to be published this month must specify its contours.
Porrentruy, November 5, 2024. A municipal garbage truck enters the grounds of an agricultural estate, La Prairie Biogaz, to dump green waste, including Halloween pumpkins. Individuals also come to place their waste to be recycled or used in the farm’s compost. A back and forth typical of a local circular economy and which revolves around a biogas installation.
The plant recovers kitchen waste from canteens, EMS and barracks in surrounding communities. It uses urine and excrement from neighboring cattle, manure, slurry, grass and other cereal residues to supply two digesters. Two domes in which this biomass is mixed and fermented in an anaerobic environment (without air, therefore without odor, between 42 and 50 degrees Celsius) for a short month to exploit its energy potential. Biogas and heat come out. The gas is burned to produce electricity and the heat partly recovered to serve as heating on the farm. The digestate (the green waste that remains) is used to feed crops.
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