Committing to using renewable energy: biogas
Lesaffre encourages the use of methanisation technology at its subsidiaries to produce biogas, a renewable energy that cuts CO2 emissions and discharges from wastewater treatment plants. Focus on two of Lesaffre’s subsidiaries:
SIL (Société Industrielle Lesaffre) ensures maximum reduction of waste from its yeast production process. This French subsidiary converts the fraction of raw materials not used by yeast into agri-supply products to meet its customers’ needs.
Water evaporated during concentration and recondensed is treated at a wastewater treatment plant. This stage generates biogas, which is used to dry the yeast-derived products that will then be recycled by composting.
The dry form of these organic by-products, called Fertel, which is optimised in terms of volume, thereby reduces the transportation impact.
To optimise the production costs of its yeast-derived products, the Chinese subsidiary Guangxi Danbaoli Yeast Co. reclaims the biogas produced by the methanisers at its biological wastewater treatment facility in its vinasse drying workshop.
This biogas partially substitutes coal used for drying, thereby reducing the subsidiary’s carbon footprint. Vinasse is the liquid by-product created by the concentration of fermentation must, which after drying becomes vinasse powder.
This vinasse powder is used to develop fertilisers for crops under the Canepro brand, which is very popular with Chinese farmers as an alternative to chemical fertilisers.
What is biogas?
Biogas is a gas made up of methane and carbon dioxide resulting from the methanisation process based on the breakdown of organic matter by microorganisms in anaerobic conditions.