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Author(s): Maria J. Ferreira
Manuel F. Almeida
Sílvia C. Pinho
Joana R. Gomes
José L. Rodrigues
Title: Alkaline Hydrolysis of Chromium Tanned Leather Scrap Fibers and Anaerobic Biodegradation of the Products
Issue Date: 2014
Abstract: Chromium tanned leather wastes fibers are difficult to manage by chemical and biological processes due to the strong bonds established between collagen and chromium. Therefore, it is of great interest to develop treatments that disrupt recalcitrant bonds and may open new perspectives to materials valorization. A temperature and pressure-assisted alkaline hydrolysis method has been studied. The effects of sodium hydroxide concentration, temperature, holding time and leather fibers to solution ratio on organic matrix destruction, chromium dissolution and anaerobic biodegradability of hydrolyzates obtained are reported. The more suitable conditions found are leather fibers treatment at 423 K for 1.5 h with NaOH 4 mol/L solution and solid to liquid (S/L) ratio (w/w) of 0.15 or 0.2. Under these conditions, more than 98 % of the leather and 85 % of chromium were dissolved. The hydrolyzates may be used in the leather process and show anaerobic biodegradability mostly in the range of 20-30 %. This work establishes an alternative route of treatment that promotes fast destruction of chromium tanned leather scrap, and may avoid its landfilling, contributing to recover part of resources contained in leather waste.
Subject: Ciências Tecnológicas, Ciências da engenharia e tecnologias
Technological sciences, Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/POCI/AMB/62704/2004/Hidrólise e biometanização de resíduos de couro curtidos ao crómio/POCI/AMB/62704/2004
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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