Taking advantage of the RECYCLES workshop held in Pisa at the beginning of July 2022, Albert Bartrolí and David Gabriel, from AERIS Tecnologías Ambientales S.L. and Universitat Autònoma de Barcelona, respectively, started their secondments in Italy. They will be dealing with the development of a biogas treatment system for an anaerobic digestion pilot plant treating fleshing waste located in Consorzio Cuoiodepur Spa facilities, as well as with the construction of a database on liquid and gaseous effluents from the Cuoiodepur tannery wastewater treatment plant.