Alkaline Hydrolysis of Chromium Tanned Leather Scrap Fibers and Anaerobic Biodegradation of the Products

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Maria J. Ferreira (Author) Other; Manuel F. Almeida (Author) FEUP; Sílvia C. Pinho (Author) FEUP; Joana R. Gomes (Author) Other; José L. Rodrigues (Author) Other

Journal

Title: Waste and Biomass Valorization

Vol. 5 No. 4

Pages: 551-562

ISSN: 1877-2641

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 8 Citations

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Associated Projects

POCI/AMB/62704/2004 - Hidrólise e biometanização de resíduos de couro curtidos ao crómio

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00A-73R

DOI: 10.1007/s12649-013-9252-9

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12