D. S. Stefan, A. Manea-Saghin, G. Zainescu, E. A. Meghea, M. Stefan
Wednesday 19 December 2018 by Libadmin2018


The tanning industry aims at converting the raw hide or skin (a putrescible material) into leather. At each ton of raw hides results 200-250 kg leather, while the untanned solid waste as organic fractions is around 500-600 kg. According to the EU policies on Green and Circular Economy the Action Plan covers the whole cycle: from production and consumption to waste management and use of secondary raw materials. In contrast with the traditional, linear „extract-transform-use-dispose” economy model, the circular model proposes closing the loop of products lifecycles by increasing recycling and re-use, the target for waste being to establish a road map for reuse by turning by-products into raw materials. In line with these goals the ways to waste re-use must be identified in the tanning industry. In this context, the main ways to valorise the untreated hide and skin are production of gelatine and glue, fertilisers from protein hydrolysate, collagen from trimming and splits, compost by aerobic digestion and biogas by anaerobic digestion from waste and sludge. In this paper a comparative study regarding capitalisation of the untreated waste of hide and skin is presented.

Keywords: skin, hide waste, hydrogel, gelatine

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