Descontaminação do resíduo industrial de couro, uma proposta para o desenvolvimento sustentável nos curtumes

• Ano de defesa: 2015
• Autor(a) principal: Garcia, Nelissa Gonçalves [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Couros; Resíduos; Colageno; Desenvolvimento sustentável; Leather
• Link de acesso: http://hdl.handle.net/11449/126511; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/18-08-2015/000844529.pdf

This work is based on a treatment of chrome shavings, which allows the decontamination of the chromium containing in leather waste in order to obtain collagen. In addition, this project contributes to the reduction of environmental impacts and to promote the sustainable development in tanneries industries. The process is called dechroming and it is based on a chemistry treatment which results in collagen fibers called in this work as dechromed waste. This new material has potential applications such as cosmetics, adhesives, finishing agents or film forming. In the dechroming is also generate an effluent rich in Cr6+, that could be treated and reduced to Cr3+ which can be reused in the tanning process. So, this work is based on the reversibility of the tanning process by the extraction of a new product from the leather waste that is work is based on the reversibility of the tanning process by the extraction of a new product form the leather waste that is generated in tones on the tanneries The deschromed waste underwent to a toxicity study to determine how much chrome was removed, in addition it was characterized through the infrared spectroscopy (FT-IR), Raman spectroscopy and thermal analyses (DSC, TG). The effluent was chemically treated in order to reduce the Cr6+ to Cr3+, to be reused in the tanning process as a basic chromium sulfate. The results confirm the dechroming efficiency achieving 99,29% of chrome removed. Through the structural and thermal analyses it was possible to confirm that the dechromed waste is contributed basically of collagen, that is conserved proving that the process doesn't degrated the collagen structure. It was concluded too that is possible to prepare a basic chromium sulfate with basicity similar with the commercial product