Waterless processing of sheep wool fiber in textile industry with supercritical CO2: Potential and challenges

Allafi, Faisal; Hossain, Shakhawat; Kadir, Mohd Omar Ab; Lalung, Japareng; Ahmad, Mardiana Idayu

doi:10.1016/j.jclepro.2020.124819

Cited by 27 publications

(4 citation statements)

References 121 publications

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“…Its chemical composition consisting mostly of cellulose, about 80% DW (Table 1), a polymer structure with high crystallinity that requires pretreatment for successful AD [31]. Wool is a natural protein fiber highly exploited as a raw material in the textile industry due to its qualities such as high heat retention, high stain and static resistance, and good flexibility [32]. As the highest methane yield is usually observed in protein-rich substrates [33], the high protein content in wool (70% DW) indicates its potentially high energy value (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Meta-Analysis of Pathways to Increase Biogas Production in the Textile Industry

et al. 2022

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The textile industry is one of the largest environmental polluters in the world. Although waste management via anaerobic digestion (AD) is a sustainable strategy to transform waste into clean energy and water recovery, the efficiency of the AD process is reduced by the presence of recalcitrant materials, chemicals, and toxic contents. This study aims to investigate the performance of several chemical, physical, and biological pretreatments applied to improve the biodegradability of textile waste. We performed a meta-analysis with 117 data extracted from 13 published articles that evaluated the efficiency of pretreatments applied to textile waste prior to AD to increase biogas production measured as methane (CH4) yield. Even though the majority of the studies have focused on the effect of chemical and physical pretreatments, our results showed that the application of biological pretreatments are more efficient and eco-friendlier. Biological pretreatments can increase CH4 yield by up to 360% with lower environmental risk and lower operating costs, while producing clean energy and a cleaner waste stream. Biological pretreatments also avoid the addition of chemicals and favor the reuse of textile wastewater, decreasing the current demand for clean water and increasing resource circularity in the textile industry.

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Section: Resultsmentioning

confidence: 99%

Comprehensive Meta-Analysis of Pathways to Increase Biogas Production in the Textile Industry

et al. 2022

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“…Wool is a naturally occurring protein fiber extracted primarily from the follicles of sheep. Sheared wool contains dead skin, waxes, suints, sand, dirt, and residual animal and vegetable matter as impurities [1]. These impurities are collectively termed wool grease, for subsequent dyeing and finishing treatments this wool grease is removed in the scouring process by hot water treatments using mild detergents [2].…”

Section: Introductionmentioning

confidence: 99%

Assessing Energy Emissions and Environmental Impact of Wool Processing: A Case Study of an Indian Textile Mill

Vade,

Tari,

Athalye

2024

Sustainable Polymer &Amp; Energy

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The objective of this study is to investigate and analyze the effect of varying sources of energy inputs and their impact on carbon emissions during wool fiber processing. The method involved industrial visits to the textile wool processing mill and interaction with the manufacturing as well as commercial sourcing teams to gather relevant data. The results and outcome of this analysis indicate that wool wet processing is responsible for a significant carbon emission of about 0.031 tCO2e/unit of production. Coal as a source of energy has the highest carbon emission 0.066 tCO2e/product, while the use of biomass and Pressurized Natural Gas (PNG) had significantly lower CO2 emissions. Further, this study evaluated the scope 1 and scope 2 category emissions produced at the wool processing stage which accounted for 56303.2 tCO2e and 1817.10 tCO2e respectively.

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“…Additionally, typical temperatures used during washing typically range between 50 and 65°C. However, lower temperatures are employed when using alkaline washing conditions, typically less than 55°C (Salem Alla et al, 2021). Once the process is complete, warm or hot water containing various amounts of chemicals is discharged as wastewater, which if untreated, can thermally pollute the environment due to the high temperature of the e uent.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a binary amphiphile/solvent mixture for the formulation of an ecological detergent as an alternative for removing fat from natural fiber surfaces

Huillca-Mamani,

Pacheco-Meza,

Gutiérrez-Oppe

et al. 2024

Preprint

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The current research focused on the use of a binary amphiphile/solvent mixture consisting of a natural surfactant (alkylpolyglucoside) and the green solvent ethyl lactate (EL) as an active compound for the formulation of a new ecological detergent, to improve the conditions of the washing process as temperature, pH, lipase integration, type of surfactant and detergent dose, to remove fat and dirt from natural fiber surfaces effectively. The best conditions for residual fat percentage <0.37% were achieved at 25 °C, pH 9, and using 0.3% detergent doses without lipase. The study also found that pH and the interaction between pH and surfactant type significantly influenced the percentage of residual fat. All the estimated results mean that the detergent obtained has excellent cleaning properties because there is a strong interaction between the alkylpolyglucoside/ethyl lactate binary mixture, which has a positive effect on reducing the percentage of residual fat and dirt and suggests its use potential in the formulation of green detergents for washing natural and synthetic textile fibers as a replacement for detergents based on ethoxylated fatty alcohols.

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Waterless processing of sheep wool fiber in textile industry with supercritical CO2: Potential and challenges

Cited by 27 publications

References 121 publications

Comprehensive Meta-Analysis of Pathways to Increase Biogas Production in the Textile Industry

Comprehensive Meta-Analysis of Pathways to Increase Biogas Production in the Textile Industry

Assessing Energy Emissions and Environmental Impact of Wool Processing: A Case Study of an Indian Textile Mill

Evaluation of a binary amphiphile/solvent mixture for the formulation of an ecological detergent as an alternative for removing fat from natural fiber surfaces

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