Closing the textile loop: Enzymatic fibre separation and recycling of wool/polyester fabric blends
Closing the textile loop: Enzymatic fibre separation and recycling of wool/polyester fabric blends
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DOI：
10.1016/j.wasman.2019.10.026
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发表时间：
2020-02-01
期刊：
影响因子：
8.1
通讯作者：
Speight, Robert
中科院分区：
文献类型：
--
作者：
Navone, Laura;Moffitt, Kaylee;Speight, Robert
纺织品废料是一个严重的环境问题，只有一小部分时装业的产品被收集和再利用或回收。在消费后废物的情况下，混合纺织品中不同的天然和合成纤维的混合物加剧了这一问题。混合纤维废物的分离，其中服装往往是多组分的，提出了一个主要的回收问题，因为纤维必须分离成单一组分，以实现有效的回收。本文研究了酶法对羊毛/涤纶混纺织物中羊毛纤维的选择性消化。通过添加还原剂的两步法应用角蛋白酶实现羊毛纤维的完全降解，并回收未消化的聚酯纤维。电子显微镜显示织物共混物中的天然纤维完全分解，而回收的合成纤维的光谱和机械分析证实，与原始样品相比，酶处理对聚酯的性能没有显着影响。因此，聚酯纤维适合于再循环成聚酯纱线并再用于制造新服装或其他产品。富含营养的角蛋白水解产物可用于微生物生长培养基或掺入生物肥料或动物饲料中，为循环经济的发展做出贡献。(C)2019爱思唯尔有限公司版权所有。
Textile waste presents a serious environmental problem with only a small fraction of products from the fashion industry collected and re-used or recycled. The problem is exacerbated in the case of post-consumer waste by the mixture of different natural and synthetic fibres in blended textiles. The separation of mixed fibre waste, where garments are often multicomponent, presents a major recycling problem as fibres must be separated to single components to enable effective recycling. This work investigates the selective digestion of wool fibres from wool/polyester blended fabrics using an enzymatic approach. Complete degradation of wool fibres was achieved by application of a keratinase in a two-step process with addition of reducing agent and undigested polyester fibres were recovered. Electron microscopy showed complete breakdown of the natural fibres in the fabric blends, while spectroscopic and mechanical analysis of the recovered synthetic fibres confirmed that the enzymatic treatment had no significant impact on the properties of the polyester compared to virgin samples. The polyester fibres are therefore suitable to be recycled to polyester yarn and re-used in the manufacture of new garments or other products. The nutrient rich keratin hydrolysate could be used in microbial growth media or incorporated into bio-fertilisers or animal feed, contributing to the development of the circular economy. (C) 2019 Elsevier Ltd. All rights reserved.