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Energy

 
Énergie

Given the present-day challenges of global warming and the scarcity of resources, Séché Environnement is committed to promoting energy production from waste resources at all its treatment facilities.

  • The recovery of biogas from the natural degradation of biomass contained in waste at storage facilities : all sites have been provided with recovery tools (turbines or generators) to produce electricity that is fed back into the grid.

    Furthermore, the Changé site has developed a unique type of cogeneration and supplies a portion of its thermal energy to an agricultural cooperative located in the immediate vicinity of the site as part of an industrial ecology strategy.

  • Production of thermal energy (steam) at thermal treatment facilities (see also) for industrial users in the immediate vicinity. A portion of such energy can also be recovered in the form of electricity or, depending on prevailing local conditions, to meet in-house needs.

  • Production of SRFs (Solid Recovered Fuels) from the mixed, non-recoverable, ordinary fraction (bits of plastic, wood or paper) to supply compliant boilers with fuel in order to guarantee the traceability of the waste and its handing under the best sanitary and environmental conditions.

  • Development of methane production tools in order to deliver a specific solution using separately collected fermentable waste for generating electricity.

Because of the total energy output of all the Group's sites, Séché Environnement is able to generate more than 1,014 GWh per year, of which nearly 70% is labeled "green electricity" (fraction derived from biomass).

Séché Environnement is 204 % self-sufficient in meeting all its energy needs.

 

Microalgae cultivation and biofuel production pilot project at the SVO facility in Vigeant

At the SVO site, biogas is recovered by generators to produce electricity. Combustion from the engine releases heat, which is used on-site to feed pools of microalgae grown for the manufacture of diesters.

This offers a triple advantage :

  • A unique form of cogeneration (combined heat and power): ultimately the algal cultures should absorb all the heat that is produced and the project will transition from the pilot study phase to the industrialization phase.

    The use of heat in cultivating microalgae promotes their growth and development.

  • Recycling CO2 and combating global warming: injected into the pools where algae are being cultivated, the CO2 generated during electricity production operations promotes the growth of the microalgae, which will absorb nearly all of it during development.

  • Manufacturing biofuel. Microalgae have very high lipid content (40%) and produce a yield 30 times greater than that derived from other plants, such as colza. Moreover, their use in manufacturing diesters does not compete with other plants crops that are likely to be used as food for animals or humans. This is a decisively sustainable development-oriented approach.