From tanning collagen to sustainable biogas that drastically reduces greenhouse gas emissions compared to fossil fuels: it is the result of the project to enhance the industrial waste of vegetable tanning conducted jointly by the Spanish Research Institutes LEQUIA and INCAR-CSIC which implements a real circular economy in the world of leather.

Sustainable activated carbons were obtained from collagen by chemical activation, with or without a previous pyrolysis step at different activation temperatures (750° and 900° C) and different ratio by weight of activating agent/precursor: microporous adsorbent materials are usable both for environmental applications and in the requalification of biogas energy recovery, thus realising one of the key objectives of the European Renewable Energy Directive.