Closing the textile loop: Enzymatic fibre separation and recycling of wool/polyester fabric blends

Navone, Laura; Moffitt, Kaylee; Hansen, Kai Anders; Blinco, James P.; Payne, Alice; Speight, Robert

doi:10.1016/j.wasman.2019.10.026

Cited by 101 publications

(51 citation statements)

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“…This strategic option can be a source of innovation, by minimizing waste and keeping materials within the production–consumption loop during a considerable period of time, 8 turning the “waste” into new products. 13,15…”

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“…14 This strategic option can be a source of innovation, by minimizing waste and keeping materials within the production-consumption loop during a considerable period of time, 8 turning the ''waste'' into new products. 13,15 Nevertheless, there are authors (e.g. McDonough and Braungart 16 ) that criticized the ''reduce, reuse, recycle'' approach because it perpetuates a one-way, ''cradle to grave'' manufacturing model that dates to the Industrial Revolution and casts off as much as 90% of the materials it uses as waste, much of it toxic.…”

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confidence: 99%

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Fostering sustainable consumer behavior regarding clothing: Assessing trends on purchases, recycling and disposal

Paço

Filho

Ávila

et al. 2020

Textile Research Journal

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The apparel industry, which includes the clothing/garment sector, encompasses the supply chain of clothing and garments, starting with the textile and fashion industry, all the way to fashion retailers and the trade with second-hand clothes and textile recycling. This sector is characterized by substantial wastes, which may be minimized by means of textile recycling. This paper reports on the results of an international study on sustainable clothing consumption. This paper identifies and analyzes attitudes and behaviors regarding the clothing industry in a sample of 203 individuals. The results suggest a number of trends. Firstly, they show the complexity of purchase habits. The reasons why individuals dispose of their old or not used clothes are manifold, and include objective and subjective factors. Also, the paper illustrates the existence of disparities in respect of clothing use and disposal behavior. Finally, the results suggest that there is a need for more awareness-raising initiatives, in order to make consumers more conscious about the options available and the need for a more sustainable use of clothing.

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Fostering sustainable consumer behavior regarding clothing: Assessing trends on purchases, recycling and disposal

Paço

Filho

Ávila

et al. 2020

Textile Research Journal

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“…There are also a number of promising applications of keratinases that have not been commercialized to date: dag or manure balls removal from cattle hides and tails [145]; extraction of glucocorticoids from chicken feathers to monitor the stress level in poultry breeding and production programmes [146] extraction of chicken feather cholesterol as a precursor to bile salts that can be used to produce bio-emulsifiers and biosurfactants in the cosmetic industry [18]; selective hydrolysis of wool from wool/polyester or mixed textiles to facilitate textile recycling [147]; and dehairing of hides in the leather industry [64,65,82].…”

Section: Potential Applications Of Keratinasesmentioning

confidence: 99%

Challenges and Opportunities in Identifying and Characterising Keratinases for Value-Added Peptide Production

et al. 2020

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Keratins are important structural proteins produced by mammals, birds and reptiles. Keratins usually act as a protective barrier or a mechanical support. Millions of tonnes of keratin wastes and low value co-products are generated every year in the poultry, meat processing, leather and wool industries. Keratinases are proteases able to breakdown keratin providing a unique opportunity of hydrolysing keratin materials like mammalian hair, wool and feathers under mild conditions. These mild conditions ameliorate the problem of unwanted amino acid modification that usually occurs with thermochemical alternatives. Keratinase hydrolysis addresses the waste problem by producing valuable peptide mixes. Identifying keratinases is an inherent problem associated with the search for new enzymes due to the challenge of predicting protease substrate specificity. Here, we present a comprehensive review of twenty sequenced peptidases with keratinolytic activity from the serine protease and metalloprotease families. The review compares their biochemical activities and highlights the difficulties associated with the interpretation of these data. Potential applications of keratinases and keratin hydrolysates generated with these enzymes are also discussed. The review concludes with a critical discussion of the need for standardized assays and increased number of sequenced keratinases, which would allow a meaningful comparison of the biochemical traits, phylogeny and keratinase sequences. This deeper understanding would facilitate the search of the vast peptidase family sequence space for novel keratinases with industrial potential.Catalysts 2020, 10, 184 2 of 23 with keratinolytic activity for keratin hydrolysis protects the integrity of the keratin amino acids in most cases and allows control over the peptide size in the hydrolysate that is not readily achievable with other methods [5]. This degree of control allows the production of bespoke medical biomaterials, smart biocomposites, protein feed supplements with enhanced nutritional and bioactive properties as well as personal care products with enhanced functional and bioactive properties.Identifying peptidases with keratinolytic activity is an inherent problem associated with the search for new enzymes. Keratinase activity however appears to be dependent on the accessibility of the keratin substrate to the enzyme [6,7]. Thermochemical or biochemical treatment of the keratin, with emphasis on the reduction of the disulphide bond and disruption of other important bonds involved in the structural stability of keratin like isopeptide, hydrogen and glycolytic bonds [6,[8][9][10], appears to be the prerequisite for enzymatic hydrolysis. Sulphitolysis, which involves reduction of the disulphide bond in keratin, often acts synergistically with keratinases in nature [6,7]. Although destabilization of the keratin structure is a prerequisite for keratin hydrolysis, not all peptidases can hydrolyse keratin. Peptidases like trypsin, papain and pepsin cannot hydrolyse keratin as efficiently ...

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“…Com base nisso, a tecnologia desenvolvida pode ser uma abordagem promissora para a reciclagem de resíduos têxteis com altos rendimentos e múltiplas vantagens sobre os métodos tradicionalmente utilizados. Navone et al (2020), afirmam que a separação de resíduos de fibras misturadas, sendo Research, Society and Development, v. 9, n. 11, e96291110613, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i11.10613 22 as roupas frequentemente multicomponentes, apresenta um grande problema de reciclagem, pois as fibras devem ser separadas em componentes individuais para permitir uma reciclagem eficaz. O trabalho desenvolvido empregou um tratamento enzimático em misturas de tecido de lã/poliéster para degradar seletivamente as fibras de lã enquanto recupera as fibras sintéticas.…”

Section: Reciclagem Químicaunclassified

“…As fibras poliméricas obtidas após o tratamento enzimático retêm a integridade e as propriedades físicas das fibras virgens e podem ser utilizadas na fabricação de novas roupas ou outros produtos têxteis e derivados de poliéster. O hidrolisado de queratina rico em nutrientes pode ser utilizado em meios de crescimento microbiano ou incorporado em biofertilizantes ou ração animal, contribuindo para o desenvolvimento da economia circular (Navone et al, 2020). A reciclagem química de resíduos têxteis é uma alternativa para recuperar a matériaprima de origem petroquímica presentes nos tecidos mantendo a sua qualidade.…”

Section: Reciclagem Químicaunclassified

Alternativas de reutilização de resíduos têxteis

Velicko

Amrginski

Hemkemeier

2020

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Os produtos têxteis são indispensáveis no cotidiano, estando presentes em diversos formatos e características. No entanto, a indústria têxtil é o segundo maior poluente do mundo devido as poucas técnicas de reutilização e reciclagem que acarretam grandes impactos ambientais. Dados mostram que a reciclagem dos resíduos têxteis não chega a 25% do que é gerado, assim, produzindo cerca de 1,2 bilhões de toneladas de emissões de gases de efeito estufa por ano. A reciclagem dos resíduos têxteis é considerada de grande necessidade e viabilidade na concretização do conceito de economia circular, porém é desafiadora, especialmente porque estes resíduos geralmente são misturados com outras fibras. Neste sentido, o presente trabalho apresenta o conceito de economia circular relacionado a indústria têxtil e as formas de reciclagem de tecidos, visando a redução dos impactos ambientais. A economia circular, apresenta um modelo capaz de desvincular o crescimento econômico da geração de resíduos, transformando-os em novos produtos e materiais com a máxima eficiência objetivando chegar a um modelo econômico com desperdício zero, imprescindível para alcançar um crescimento sustentável. A transição para uma economia circular deve começar com a prevenção de resíduos e a minimização dos resíduos depositados em aterro e finalmente a implantação de processos de reciclagem. Os diferentes processos de reciclagens se apresentaram como promissores no sentido de contribuir de forma significativa com a economia circular. As principais tecnologias de reciclagem, de resíduos têxteis, compreendem o processo de moldagem por compressão a quente, o processo de reciclagem mecânica e o processo de reciclagem química.

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Closing the textile loop: Enzymatic fibre separation and recycling of wool/polyester fabric blends

Cited by 101 publications

References 30 publications

Fostering sustainable consumer behavior regarding clothing: Assessing trends on purchases, recycling and disposal

Fostering sustainable consumer behavior regarding clothing: Assessing trends on purchases, recycling and disposal

Challenges and Opportunities in Identifying and Characterising Keratinases for Value-Added Peptide Production

Alternativas de reutilização de resíduos têxteis

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