They turn olive and pine waste into biochar for asphalt that helps capture carbon
AMSA, ELSAN, and the Universitat Politècnica de Catalunya developed an asphalt mixture incorporating biochar derived from olive pits and pine residues via pyrolysis, with lab tests showing up to 75% emissions reduction in the treated pavement layer. The development expands biochar applications into road construction, positioning agricultural and forestry waste as a carbon-sequestering input for infrastructure materials.
The integration of biochar into asphalt mixtures represents a promising advancement in sustainable road construction. Developed by Agustí i Masoliver (AMSA), Asfaltos y Construcciones Elsan (ELSAN), and the Universitat Politècnica de Catalunya (UPC), this initiative utilizes biochar derived from agricultural and forestry waste to replace traditional asphalt components, thereby reducing the carbon footprint of road infrastructure.
The project has been recognized by the urban challenge “The 21st Century Street Section” for its innovative approach to waste utilization and climate change mitigation. Biochar is produced through pyrolysis, a process that transforms biomass with minimal oxygen, stabilizing carbon in a solid form. Olive pits and pine residues, abundant in Mediterranean regions, serve as the primary feedstock for this biochar.
Incorporating biochar into asphalt not only valorizes waste materials but also prevents their degradation or incineration, which would release carbon dioxide. This integration supports sustainable construction by managing agricultural waste effectively. Biochar's ability to immobilize carbon for extended periods is a key advantage, as it retains carbon within a stable chemical structure, unlike rapidly decomposing plant residues.
When used in pavement surfaces, biochar helps retain carbon captured by trees and crops, effectively turning roads into carbon reservoirs. Laboratory tests confirm that biochar-enhanced asphalt performs comparably to conventional materials while reducing emissions by up to 75% for the pavement layer.
Beyond road construction, olive by-products offer environmental benefits. Olive pomace and pruning residues can be composted to enhance soil fertility and support regenerative agriculture. Additionally, these residues can be used as biomass for renewable energy, reducing reliance on fossil fuels. They can also be incorporated into industrial processes to produce bioplastics, organic fertilizers, and substrates for soil restoration.
The comprehensive use of olive residues exemplifies a circular economy, reducing waste, lowering greenhouse gas emissions, and creating sustainable products from local resources. This model supports environmental protection and fosters productive activities with reduced ecological impact.
Source: Biochar Feed