Ms. Christelle Rabbat from the Energy Systems and Environment department (DSEE) and the GEPEA laboratory, will present her research about :
"Study of the valorization of biobased building materials at end-of-life"
The current increasing use of biomass-based insulation materials (BIMs) will result in significant volumes of waste to be treated by 2050. Today, the default scenario is landfilling. For these reasons, this study aims to explore and evaluate the recovery of BIMs at their end-of-life. The identification of current and future deposits of BIMs marketed in France and the associated recovery perspectives is the starting point of this study. Subsequently, five of the market's most representative BIMs were selected and characterized in the laboratory. Based on the results, the energy recovery by thermochemical conversion processes, particularly by pyrolysis, pyro-gasification, and combustion was selected. Pyrolysis and pyro-gasification tests were conducted on MIBs and the impact of the material composition on the yields and qualities of the products (biochar, bio-oil, syngas) was determined. Then, the bio-oil was upgraded by solvolysis under mild conditions for shipping fuel production. The incorporated flame retardants impacted the syngas composition. In addition, the adsorption performance of biochar and activated carbon, derived from recycled textiles, were evaluated for the removal of ibuprofen from water. Then, the combustion of two bio-based materials and mixtures (with certified wood) was performed in a 20 kW boiler to examine the effect of fuel type on environmental and energy performance. In conclusion, the energy valorization of BIM generates value-added products; namely, liquid fuels, syngas, activated carbon, and heat.
Thesis acreditation from IMT Atlantique with the Doctoral School SPIN
Keywords: Biomass-based insulation materials, energy recovery, pyrolysis, pyro-gasification, combustion, Waste management